bump version de 0.15

grid rendering for current layer.

.travis.yml

@@ -1,14 +1,9 @@
 language: node_js
 node_js:
-  - "4.1"
+  - "7.4.0"
 before_install:
   - npm update -g npm
   - npm install -g grunt-cli
-  - git clone git://github.com/n1k0/casperjs.git ~/casperjs
-  - cd ~/casperjs
-  - git checkout tags/1.1.3
-  - export PATH=$PATH:`pwd`/bin
-  - cd -
 before_script:
   - phantomjs --version
   - casperjs --version

Gruntfile.js

@@ -47,16 +47,13 @@ module.exports = function(grunt) {
   var integrationTestPaths = require('./test/casperjs/integration/IntegrationSuite.js').tests;
   var integrationTests = prefixPaths(integrationTestPaths, "test/casperjs/integration/");
 
-  var getConnectConfig = function (base, port, host) {
+  var getConnectConfig = function (base, port, host, open) {
-    if (typeof base === 'string') {
-      base = [base];
-    }
-
     return {
       options: {
         port: port,
         hostname : host,
-        base: base
+        base: base,
+        open: open
       }
     };
   };
@@ -98,18 +95,9 @@ module.exports = function(grunt) {
      */
 
     connect: {
-      prod: getConnectConfig('dest/prod', PORT.PROD, hostname),
+      prod: getConnectConfig('dest/prod', PORT.PROD, hostname, true),
-      test: getConnectConfig(['dest/dev', 'test'], PORT.TEST, hostname),
+      test: getConnectConfig(['dest/dev', 'test'], PORT.TEST, hostname, false),
-      dev: getConnectConfig(['dest/dev', 'test'], PORT.DEV, hostname)
+      dev: getConnectConfig(['dest/dev', 'test'], PORT.DEV, hostname, 'http://' + hostname + ':' + PORT.DEV + '/?debug')
-    },
-
-    open : {
-      prod : {
-        path : 'http://' + hostname + ':' + PORT.PROD + '/'
-      },
-      dev : {
-        path : 'http://' + hostname + ':' + PORT.DEV + '/?debug'
-      }
     },
 
     watch: {
@@ -343,9 +331,9 @@ module.exports = function(grunt) {
 
   // SERVER TASKS
   // Start webserver and watch for changes
-  grunt.registerTask('serve', ['build', 'connect:prod', 'open:prod', 'watch:prod']);
+  grunt.registerTask('serve', ['build', 'connect:prod', 'watch:prod']);
   // Start webserver on src folder, in debug mode
-  grunt.registerTask('play', ['build-dev', 'connect:dev', 'open:dev', 'watch:dev']);
+  grunt.registerTask('play', ['build-dev', 'connect:dev', 'watch:dev']);
 
   // ALIASES, kept for backward compatibility
   grunt.registerTask('serve-debug', ['play']);

README.md

@@ -1,10 +1,10 @@
 Piskel
 ======
 
-[![Travis Status](https://api.travis-ci.org/piskelapp/piskel.png?branch=master)](https://travis-ci.org/piskelapp/piskel) [![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](http://gruntjs.com/)
+[![Travis Status](https://api.travis-ci.org/piskelapp/piskel.png?branch=master)](https://travis-ci.org/piskelapp/piskel) [![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](https://gruntjs.com/)
 
 Piskel is an easy-to-use sprite editor. It can be used to create game sprites, animations, pixel-art...
-It is the editor used in **[piskelapp.com](http://piskelapp.com)**.
+It is the editor used in **[piskelapp.com](https://www.piskelapp.com)**.
 
 <img
   src="https://screenletstore.appspot.com/img/95aaa0f0-37a4-11e7-a652-7b8128ce3e3b.png"
@@ -19,14 +19,14 @@ The Piskel editor is purely built in **JavaScript, HTML and CSS**.
 
 We also use the following **libraries** :
 * [spectrum](https://github.com/bgrins/spectrum) : awesome standalone colorpicker
-* [gifjs](http://jnordberg.github.io/gif.js/) : generate animated GIFs in javascript, using webworkers
+* [gifjs](https://jnordberg.github.io/gif.js/) : generate animated GIFs in javascript, using webworkers
 * [supergif](https://github.com/buzzfeed/libgif-js) : modified version of SuperGif to parse and import GIFs
 * [jszip](https://github.com/Stuk/jszip) : create, read and edit .zip files with Javascript
 * [canvas-toBlob](https://github.com/eligrey/canvas-toBlob.js/) : shim for canvas toBlob
-* [jquery](http://jquery.com/) : used sporadically in the application
+* [jquery](https://jquery.com/) : used sporadically in the application
-* [bootstrap-tooltip](http://getbootstrap.com/javascript/#tooltips) : nice tooltips
+* [bootstrap-tooltip](https://getbootstrap.com/javascript/#tooltips) : nice tooltips
 
-As well as some **icons** from the [Noun Project](http://thenounproject.com/) :
+As well as some **icons** from the [Noun Project](https://thenounproject.com/) :
 * Folder by Simple Icons from The Noun Project
 * (and probably one or two others)
 

bin/copy-to-piskel-website.js

@@ -17,8 +17,17 @@ function onCopy(err) {
 
   console.log('Copied static files to piskel-website...');
   let previousPartialPath = path.resolve(PISKELAPP_PATH, 'templates/editor/main-partial.html');
+  fs.access(previousPartialPath, fs.constants.F_OK, function (err) {
+    if (err) {
+      // File does not exit, call next step directly.
+      console.error('Previous main partial doesn\'t exist yet.');
+      onDeletePreviousPartial();
+    } else {
+      // File exists, try to delete it before moving on.
       fs.unlink(previousPartialPath, onDeletePreviousPartial);
     }
+  })
+}
 
 function onDeletePreviousPartial(err) {
   if (err) {

cli/README.md

@@ -0,0 +1,64 @@
+# Piskel CLI
+
+Wraps the Piskel pixel editing application to enable similar export options via the command line.
+
+## Installation
+
+Option 1: Globally install Piskel
+```
+npm install -g https://github.com/piskelapp/piskel/tarball/master
+```
+
+Option 2: Clone and install Piskel normally and then run npm link inside the installation root
+
+## Usage
+
+**Export provided .piskel file as a png sprite sheet using app defaults**
+```
+piskel-cli snow-monster.piskel
+```
+
+**Export scaled sprite sheet**
+```
+piskel-cli snow-monster.piskel --scale 5
+```
+
+**Export scaled to specific (single frame) width value**
+```
+piskel-cli snow-monster.piskel --scaledWidth 435
+```
+
+**Export scaled to specific (single frame) height value**
+```
+piskel-cli snow-monster.piskel --scaledHeight 435
+```
+
+**Export sprite sheet as a single column**
+```
+piskel-cli snow-monster.piskel --columns 1
+```
+
+**Export sprite sheet as a single row**
+```
+piskel-cli snow-monster.piskel --rows 1
+```
+
+**Export a single frame (0 is first frame)**
+```
+piskel-cli snow-monster.piskel --frame 3
+```
+
+**Export a second file containing the data-uri for the exported png**
+```
+piskel-cli snow-monster.piskel --dataUri
+```
+
+**Export cropped**
+```
+piskel-cli snow-monster.piskel --crop
+```
+
+**Custom output path and/or filename**
+```
+piskel-cli snow-monster.piskel --dest ./output-folder/snah-monstah.png
+```

cli/export-png.js

@@ -0,0 +1,130 @@
+const fs = require('fs');
+
+function onPageEvaluate(window, options, piskel) {
+    console.log("\nPiskel name: " + piskel.descriptor.name);
+
+    // Setup piskelController
+    var piskelController = new pskl.controller.piskel.PiskelController(piskel);
+
+    pskl.app.piskelController = piskelController;
+
+    piskelController.init();
+
+    // Apply crop if enabled
+    if (options.crop) {
+        // Mock selection manager to avoid errors during crop
+        pskl.app.selectionManager = {};
+
+        // Setup crop tool
+        var crop = new pskl.tools.transform.Crop();
+
+        // Perform crop
+        crop.applyTransformation();
+
+        // Get cropped piskel
+        piskel = piskelController.getPiskel();
+    }
+
+    // Mock exportController to provide zoom value based on cli args
+    // and to avoid errors and/or unnecessary bootstrapping
+    var exportController = {
+        getExportZoom: function () {
+            var zoom = options.zoom;
+
+            if (options.scaledWidth) {
+                zoom = options.scaledWidth / piskel.getWidth();
+            } else if (options.scaledHeight) {
+                zoom = options.scaledHeight / piskel.getHeight();
+            }
+
+            return zoom;
+        }
+    };
+
+    // Setup pngExportController
+    var pngExportController = new pskl.controller.settings.exportimage.PngExportController(piskelController, exportController);
+
+    // Mock getColumns and getRows to use values from cli arguments
+    pngExportController.getColumns_ = function () {
+        if (options.columns) return options.columns;
+
+        if (options.rows) {
+            return Math.ceil(piskelController.getFrameCount() / pngExportController.getRows_());
+        } else {
+            return pngExportController.getBestFit_();
+        }
+    };
+
+    pngExportController.getRows_ = function () {
+        if (options.columns && !options.rows) {
+            return Math.ceil(piskelController.getFrameCount() / pngExportController.getColumns_());
+        }
+
+        return options.rows;
+    };
+
+    // Render to output canvas
+    var canvas;
+
+    if (options.frame > -1) {
+        // Render a single frame
+        canvas = piskelController.renderFrameAt(options.frame, true);
+
+        var zoom = exportController.getExportZoom();
+
+        if (zoom != 1) {
+            // Scale rendered frame
+            canvas = pskl.utils.ImageResizer.resize(canvas, canvas.width * zoom, canvas.height * zoom, false);
+        }
+    } else {
+        // Render the sprite sheet
+        canvas = pngExportController.createPngSpritesheet_();
+    }
+
+    // Add output canvas to DOM
+    window.document.body.appendChild(canvas);
+
+    // Prepare return data
+    const returnData = {
+        width: canvas.width,
+        height: canvas.height
+    };
+
+    // Wait a tick for things to wrap up
+    setTimeout(function ()  {
+        // Exit and pass data to parent process
+        window.callPhantom(returnData);
+    }, 0);
+}
+
+function onPageExit(page, options, data) {
+    // Set clip for output image
+    if (data.width && data.height) {
+        page.clipRect = { top: 0, left: 0, width: data.width, height: data.height };
+    }
+
+    console.log("\n" + 'Generated file(s):');
+
+    const dest = options.dest.replace('.png', '') + '.png';
+
+    // Render page to the output image
+    page.render(dest);
+
+    console.log(" " + dest);
+
+    if (options.dataUri) {
+        const dataUriPath = options.dest + '.datauri';
+
+        const dataUri = 'data:image/png;base64,' + page.renderBase64('PNG');
+
+        // Write data-uri to file
+        fs.write(dataUriPath, dataUri, 'w');
+
+        console.log(" " + dataUriPath);
+    }
+}
+
+module.exports = {
+    onPageEvaluate: onPageEvaluate,
+    onPageExit: onPageExit
+};

cli/index.js

@@ -0,0 +1,93 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const path = require('path');
+const minimist = require('minimist');
+const childProcess = require('child_process');
+const phantomjs = require('phantomjs');
+const binPath = phantomjs.path;
+
+// Parse command args
+let args = minimist(process.argv.slice(2), {
+  default: {
+    crop: false,
+    dataUri: false,
+    debug: false,
+    scale: 1
+  },
+});
+
+if (args.debug) console.log(args);
+
+// Ensure a path for the src file was passed
+if (!args._ || (args._ && !args._.length)) {
+  console.error('Path to a .piskel file is required');
+
+  return;
+}
+
+const src = args._[0];
+
+// Ensure the src file exists
+if (!fs.existsSync(src)) {
+  console.error('No such file: ' + src);
+
+  return;
+}
+
+// Read src piskel file
+const piskelFile = fs.readFileSync(src, 'utf-8');
+
+const dest = args.dest || path.basename(src, '.piskel');
+
+console.log('Piskel CLI is exporting...');
+
+// Get path to Piskel's app js bundle
+let piskelAppJsDir = path.resolve(__dirname +'/../dest/prod/js/');
+let minJsFiles = fs.readdirSync(piskelAppJsDir).filter(filename => filename.indexOf('min') > -1);
+let piskelAppJsFileName = minJsFiles[0];
+let piskelAppJsPath = (piskelAppJsFileName) ? path.join(piskelAppJsDir, piskelAppJsFileName) : '';
+
+if (!fs.existsSync(piskelAppJsPath)) {
+  console.error(`Piskel's application JS file not found in: ${piskelAppJsDir}. Run prod build and try again.`);
+
+  return;
+}
+
+// Prepare args to pass to phantom script
+const options = {
+  dest: dest,
+  zoom: args.scale,
+  crop: !!args.crop,
+  rows: args.rows,
+  columns: args.columns,
+  frame: args.frame,
+  dataUri: !!args.dataUri,
+  debug: args.debug,
+  piskelAppJsPath: piskelAppJsPath,
+  scaledWidth: args.scaledWidth,
+  scaledHeight: args.scaledHeight
+};
+
+const childArgs = [
+  path.join(__dirname, 'piskel-export.js'),
+  piskelFile,
+  JSON.stringify(options)
+];
+
+if (args.debug) {
+  childArgs.unshift(
+    '--remote-debugger-port=9035',
+    '--remote-debugger-autorun=yes'
+  );
+}
+
+// Run phantom script
+childProcess.execFile(binPath, childArgs, function (err, stdout, stderr) {
+  // Print any output the from child process
+  if (err) console.log(err);
+  if (stderr) console.log(stderr);
+  if (stdout) console.log(stdout);
+
+  console.log('Export complete');
+});

cli/piskel-export.js

@@ -0,0 +1,45 @@
+// PhantomJS system
+const system = require('system');
+
+// Exporter
+const exporter = require('./export-png');
+
+// Get passed args
+const args = system.args;
+
+// Parse input piskel file and options
+const piskelFile = JSON.parse(args[1]);
+const options = JSON.parse(args[2]);
+
+// Create page w/ canvas
+const page = require('webpage').create();
+
+page.content = '<html><body></body></html>';
+
+// Inject Piskel JS
+page.injectJs(options.piskelAppJsPath);
+
+// Listen for page console logs
+page.onConsoleMessage = function (msg) {
+    console.log(msg);
+};
+
+// Run page logic
+page.evaluate(function (piskelFile, options, onPageEvaluate) {
+    // Zero out default body margin
+    document.body.style.margin = 0;
+
+    // Deserialize piskel file and run exporter's page evaluate task
+    pskl.utils.serialization.Deserializer.deserialize(piskelFile, function (piskel) {
+       onPageEvaluate(window, options, piskel);
+    });
+}, piskelFile, options, exporter.onPageEvaluate);
+
+// Wait for page to trigger exit
+page.onCallback = function (data) {
+    // Run exporter page exit task
+    exporter.onPageExit(page, options, data);
+
+    // Exit
+    phantom.exit(0);
+};

misc/icons/source/common-backup.svg

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   width="90"
+   height="90"
+   viewBox="0 0 89.999997 90"
+   enable-background="new 0 0 89.231 100"
+   xml:space="preserve"
+   inkscape:version="0.92.1 r15371"
+   sodipodi:docname="common-backup.svg"
+   inkscape:export-filename="C:\Development\git\piskel\misc\icons\source\tool-rotate.png"
+   inkscape:export-xdpi="45"
+   inkscape:export-ydpi="45"><metadata
+     id="metadata15"><rdf:RDF><cc:Work
+         rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
+     id="defs13" /><sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="1148"
+     id="namedview11"
+     showgrid="false"
+     inkscape:zoom="7.75"
+     inkscape:cx="13.031976"
+     inkscape:cy="43.272537"
+     inkscape:window-x="-8"
+     inkscape:window-y="-8"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="Layer_1" /><g
+     id="g3760"
+     transform="matrix(0,-0.97677741,0.97203982,0,-2.1261998,91.355253)"
+     style="fill:#ff00ff;fill-opacity:1"><path
+       style="fill:#ff00ff;fill-opacity:1"
+       inkscape:connector-curvature="0"
+       id="path3"
+       d="m 29.229405,55.37008 c -0.387431,-1.333059 -0.642506,-2.72161 -0.738881,-4.152895 h -8.675106 c 0.115651,2.460738 0.552554,4.838559 1.260594,7.099021 z" /><path
+       style="fill:#ff00ff;fill-opacity:1"
+       inkscape:connector-curvature="0"
+       id="path5"
+       d="m 29.023802,70.783821 5.579515,-6.601516 c -1.862622,-1.780814 -3.387929,-3.907969 -4.44999,-6.287065 l -8.152106,2.946124 c 1.604978,3.800815 4.017584,7.185766 7.022581,9.942457 z" /><path
+       style="fill:#ff00ff;fill-opacity:1"
+       inkscape:connector-curvature="0"
+       id="path7"
+       d="m 47.110967,69.703978 c -3.887799,-0.260871 -7.469766,-1.6322 -10.437498,-3.790608 l -5.577588,6.598963 c 4.487901,3.403448 10.011517,5.524225 16.015086,5.803594 z" /><path
+       style="fill:#ff00ff;fill-opacity:1;stroke:none"
+       inkscape:connector-curvature="0"
+       id="path9"
+       d="M 48.464084,21.400659 V 14.532532 L 28.981398,25.698341 48.464084,36.86415 v -6.867489 c 11.042093,0 20.024317,8.91683 20.024317,19.877897 0,10.509484 -8.258763,19.134189 -18.671845,19.828145 v 8.611948 c 15.190751,-0.703524 27.330245,-13.189635 27.330245,-28.440093 0,-15.700763 -12.86681,-28.473899 -28.682717,-28.473899 z" /></g><g
+     id="g4513"
+     transform="translate(0,-2)"><rect
+       y="32.516129"
+       x="42"
+       height="15.612903"
+       width="7.9999986"
+       id="rect4494"
+       style="fill:#ff00f7;fill-opacity:1;stroke:#ffffed;stroke-width:0;stroke-linecap:butt;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:6.04534006;stroke-opacity:1" /><rect
+       transform="rotate(120)"
+       y="-76.050484"
+       x="12.680965"
+       height="15.612903"
+       width="7.9999986"
+       id="rect4494-7"
+       style="fill:#ff00f7;fill-opacity:1;stroke:#ffffed;stroke-width:0;stroke-linecap:butt;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:6.04534006;stroke-opacity:1" /></g></svg>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "piskel",
-  "version": "0.12.0",
+  "version": "0.15.0",
   "description": "Pixel art editor",
   "author": "Julian Descottes <julian.descottes@gmail.com>",
   "contributors": [
@@ -17,7 +17,8 @@
     "misc/scripts/piskel-root"
   ],
   "bin": {
-    "piskel-root": "./misc/scripts/piskel-root"
+    "piskel-root": "./misc/scripts/piskel-root",
+    "piskel-cli": "./cli/index.js"
   },
   "main": "./dest/prod/index.html",
   "scripts": {
@@ -45,7 +46,6 @@
     "grunt-karma": "1.0.0",
     "grunt-leading-indent": "0.2.0",
     "grunt-nw-builder": "3.1.0",
-    "grunt-open": "0.2.3",
     "grunt-replace": "1.0.1",
     "grunt-spritesmith": "6.4.0",
     "jasmine-core": "2.6.1",
@@ -64,5 +64,8 @@
     "toolbar": false,
     "width": 1000,
     "height": 700
+  },
+  "dependencies": {
+    "minimist": "^1.2.0"
   }
 }

src/css/dialogs-browse-backups.css

@@ -0,0 +1,152 @@
+#dialog-container.browse-backups {
+  width: 700px;
+  height: 500px;
+  top : 50%;
+  left : 50%;
+  position : absolute;
+  margin-left: -350px;
+}
+
+.backups-step-container {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+}
+
+.backups-step-content {
+  width: 100%;
+  height: 10px;
+  flex-grow: 1;
+  background: #444;
+
+  padding: 20px;
+  overflow: auto;
+  box-sizing: border-box;
+}
+
+.backups-step-actions {
+  flex-grow: 0;
+  flex-shrink: 1;
+  height: 60px;
+  display: flex;
+  align-items: center;
+  padding: 0 20px;
+}
+
+.show #dialog-container.browse-backups {
+  margin-top: -250px;
+}
+
+.browse-backups .browse-backups-disclaimer {
+  display: flex;
+  margin-bottom: 20px;
+  align-items: center;
+}
+
+.browse-backups .browse-backups-disclaimer-content {
+  padding: 0 20px;
+  font-size: 13px;
+}
+
+.browse-backups .browse-backups-disclaimer .backups-icon {
+  border: 1px solid gold;
+  flex-shrink: 0;
+  width: 90px;
+  height: 90px;
+}
+
+.browse-backups .centered-message {
+  position: absolute;
+  left: 50%;
+  width: 200px;
+  margin-top: 100px;
+  margin-left: -130px;
+  padding: 30px;
+
+  font-size: 16px;
+  text-align: center;
+  border: 1px solid;
+}
+
+.browse-backups .session-list-empty,
+.browse-backups .snapshot-list-empty {
+  color: #bbb;
+}
+
+.browse-backups .session-list-error,
+.browse-backups .snapshot-list-error {
+  color: white;
+}
+
+.browse-backups .session-item {
+  /* Transition duration should be kept in sync with SelectSession.DELETE_TRANSITION_DURATION */
+  transition: all 500ms;
+}
+
+/* Hide and slide up next sessions when deleting an item */
+.browse-backups .session-item.deleting {
+  opacity: 0;
+  margin-bottom: -60px;
+}
+
+.browse-backups .session-item,
+.browse-backups .snapshot-item {
+  display: flex;
+  align-items: center;
+
+  width: 100%;
+  height: 80px;
+
+  margin-bottom: 10px;
+  padding: 0 20px;
+
+  border: 1px solid #666;
+  box-sizing: border-box;
+}
+
+.browse-backups .snapshot-preview {
+  flex-grow: 0;
+  flex-shrink: 1;
+  /* Keep synced with SessionDetails.PREVIEW_SIZE */
+  height: 60px;
+  width: 60px;
+  margin-right: 20px;
+}
+
+.browse-backups .session-details,
+.browse-backups .snapshot-details {
+  flex-grow: 1;
+  flex-shrink: 0;
+  display: flex;
+  flex-direction: column;
+}
+
+.browse-backups .session-details-title,
+.browse-backups .snapshot-details-title {
+  font-size: 13px;
+}
+
+.browse-backups .session-details-info,
+.browse-backups .snapshot-details-info {
+  font-size: 11px;
+  color: #bbb;
+  line-height: 1.5em;
+}
+
+.browse-backups .session-actions,
+.browse-backups .snapshot-actions {
+  flex-grow: 0;
+  flex-shrink: 1;
+  display: flex;
+}
+
+.browse-backups .session-actions button,
+.browse-backups .snapshot-actions button {
+  margin-left: 10px;
+}
+
+.browse-backups .session-item:last-child,
+.browse-backups .snapshot-item:last-child {
+  margin-bottom: 0;
+}

src/css/dialogs-import.css

@@ -183,22 +183,14 @@
 .import-meta-value,
 .import-meta-label {
   padding: 2px 4px;
-  border: 1px solid gold;
 }
 
 .import-meta-label {
   border-radius: 2px 0 0 2px;
   color: var(--highlight-color);
-  border-right-width: 0;
-}
-
-.import-meta-title .import-meta-label {
-  border-right-width: 1px;
-  border-radius: 2px;
 }
 
 .import-meta-value {
-  border-radius: 0 2px 2px 0;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
@@ -242,7 +234,7 @@
 .insert-mode-option {
   display: flex;
   align-items: center;
-  margin-bottom: 5px;
+  margin: 5px 0;
 }
 
 .import-resize-option :checked + span,
@@ -250,11 +242,15 @@
   color: var(--highlight-color);
 }
 
+.import-resize-option input,
+.insert-mode-option input {
+  margin: 5px;
+}
+
 /**
  * ADJUST SIZE
  */
-.import-resize-anchor-info,
+.import-resize-anchor-info {
-.import-resize-option-label {
   margin-bottom: 10px;
 }
 

src/css/frames-list.css

@@ -135,6 +135,11 @@
   cursor: default;
 }
 
+.preview-tile .tile-overlay.tile-count.toggled {
+  background-color: gold;
+  color: black;
+}
+
 .preview-tile .tile-overlay.delete-frame-action {
    top: 0;
    right: 0;

src/css/layout.css

@@ -25,7 +25,7 @@
 .left-column {
   vertical-align: top;
   height: 100%;
-  margin-right: 7px;
+  padding-right: 7px;
   flex-shrink: 0;
 }
 
@@ -44,7 +44,8 @@
   flex-direction: column;
   position: relative;
 
-  margin-left: 10px;
+  /* Keep in sync with Constants.RIGHT_COLUMN_PADDING_LEFT */
+  padding-left: 10px;
   /* Add some padding for the absolutely positioned .cursor-coordinates */
   padding-bottom: 20px;
 }
@@ -80,12 +81,23 @@
 }
 
 .cursor-coordinates {
-  color:#888;
+  color: var(--highlight-color);
   font-size: 12px;
   font-weight: bold;
   font-family: monospace;
 }
 
+.cursor-coordinates .drawing-zoom {
+  position: absolute;
+  top: -20px;
+  left: 1px;
+}
+
+.cursor-coordinates .frame-info {
+  line-height: 1.5;
+  text-align: left;
+}
+
 /**
  * Canvases layout
  */

src/css/settings-application.css

@@ -60,22 +60,48 @@
 }
 
 .settings-item-grid-size,
+.settings-item-grid-spacing,
 .settings-item-grid-color {
   display: flex;
   align-items: center;
 }
 
 .settings-item-grid-size > label,
+.settings-item-grid-spacing > label,
 .settings-item-grid-color > label {
   width: 65px;
   flex-shrink: 0;
 }
 
-.settings-item-grid-size .size-picker-option {
+.grid-spacing-container .size-picker-option[data-size='1'] {
+  padding: 7px;
+}
+.grid-spacing-container .size-picker-option[data-size='2'] {
+  padding: 6px;
+}
+.grid-spacing-container .size-picker-option[data-size='4'] {
+  padding: 5px;
+}
+.grid-spacing-container .size-picker-option[data-size='8'] {
+  padding: 4px;
+}
+.grid-spacing-container .size-picker-option[data-size='16'] {
+  padding: 3px;
+}
+.grid-spacing-container .size-picker-option[data-size='32'] {
+  padding: 2px;
+}
+.grid-spacing-container .size-picker-option[data-size='64'] {
+  padding: 1px;
+}
+
+.settings-item-grid-size .size-picker-option,
+.settings-item-grid-spacing .size-picker-option {
   border-color: #888;
 }
 
-.settings-item-grid-size .size-picker-option:not(.selected):hover {
+.settings-item-grid-size .size-picker-option:not(.selected):hover,
+.settings-item-grid-spacing .size-picker-option:not(.selected):hover {
   border-color: white;
 }
 

src/css/settings-export.css

@@ -43,8 +43,29 @@
   float : left;
 }
 
+.gif-export-warning {
+  display: none;
+}
+
+.gif-export-warning.visible {
+  display: flex;
+  align-items: center;
+  border: 1px solid red;
+  padding: 5px;
+  margin: 5px 0;
+}
+
+.gif-export-warning-icon {
+  flex-shrink: 0;
+  margin-right: 5px;
+}
+
+.gif-export-warning-message {
+  font-weight: normal;
+}
+
 .preview-upload-ongoing:before{
-  content: "Upload ongoing ...";
+  content: "Upload in progress...";
   position: absolute;
   display: block;
   height: 100%;
@@ -123,7 +144,8 @@
   overflow: hidden;
 }
 
-.export-panel-gif .button {
+.export-panel-gif .button,
+.export-panel-png .button {
   margin-right: 5px;
   width: 75px;
   flex-shrink: 0;
@@ -133,11 +155,6 @@
   width: 50px;
 }
 
-.png-export-dimension-info,
-.png-export-datauri-info {
-  margin-left: 5px;
-}
-
 #png-export-columns,
 #png-export-rows {
   /* Override default textfield padding-right to keep the number spinners

src/css/style.css

@@ -52,7 +52,12 @@ body {
 }
 
 .checkbox-fix {
-  margin-left: 0;
+  margin: 3px 3px 3px 0;
+}
+
+.checkbox-container {
+  display: flex;
+  align-items: center;
 }
 
 .hidden {

src/css/toolbox-animated-preview.css

@@ -124,6 +124,14 @@
   border-color: var(--highlight-color);
 }
 
+/**
+ * If the icon represents an enabled state, the border should always be gold.
+ */
+.preview-contextual-action-enabled {
+  color: var(--highlight-color);
+  border-color: var(--highlight-color);
+}
+
 /**
  * Drop-down in preview size selection
  */
@@ -195,6 +203,7 @@
 
 @media (-webkit-min-device-pixel-ratio: 2),
        (min-resolution: 192dpi) {
+  .icon-minimap-popup-preview-arrow-white:hover {
     background-image: url(../img/icons/minimap/minimap-popup-preview-arrow-gold@2x.png);
-
+  }
 }

src/css/toolbox-layers-list.css

@@ -66,12 +66,17 @@
   cursor: pointer;
 }
 
-.layer-item .layer-name {
+.layer-item .layer-name,
+.layer-item .layer-name-input {
   padding: 0 0 0 10px;
   flex: 1 auto;
   white-space: nowrap;
 }
 
+.layer-item .layer-name-input {
+  width: 80%;
+}
+
 .layer-item .layer-name.overflowing-name {
   overflow: hidden;
   text-overflow: ellipsis;
@@ -82,7 +87,8 @@
 }
 
 .layer-item-opacity {
-  padding-right: 8px;
+  padding: 0 8px 0 8px;
+  flex: 0 auto;
 }
 
 .current-layer-item,

src/css/toolbox-palettes-list.css

@@ -94,7 +94,7 @@
   line-height: 35px;
   width: 100%;
   color: gray;
-  font-size: 0.7em;
+  font-size: 0.8em;
   font-style: italic;
   text-align: center
 }

src/index.html

@@ -67,6 +67,7 @@
   </div>
 
   @@include('templates/misc-templates.html', {})
+  @@include('templates/data-uri-export.html', {})
   @@include('templates/popup-preview.html', {})
 
   <span class="cheatsheet-link icon-common-keyboard-gold"
@@ -75,9 +76,10 @@
        rel="tooltip" data-placement="left" title="Performance problem detected, learn more.">&nbsp;</div>
 
   <!-- dialogs partials -->
-  @@include('templates/dialogs/create-palette.html', {})
+  @@include('templates/dialogs/browse-backups.html', {})
   @@include('templates/dialogs/browse-local.html', {})
   @@include('templates/dialogs/cheatsheet.html', {})
+  @@include('templates/dialogs/create-palette.html', {})
   @@include('templates/dialogs/import.html', {})
   @@include('templates/dialogs/performance-info.html', {})
   @@include('templates/dialogs/unsupported-browser.html', {})

src/js/Constants.js

@@ -12,13 +12,15 @@ var Constants = {
   MAX_HEIGHT : 1024,
   MAX_WIDTH : 1024,
 
-  MAX_PALETTE_COLORS : 100,
+  MAX_PALETTE_COLORS : 256,
   // allow current colors service to get up to 256 colors.
   // GIF generation is different if the color count goes over 256.
   MAX_WORKER_COLORS : 256,
 
   PREVIEW_FILM_SIZE : 96,
   ANIMATED_PREVIEW_WIDTH : 200,
+  // Keep in sync with padding-left: 10px in layout.css
+  RIGHT_COLUMN_PADDING_LEFT : 10,
 
   DEFAULT_PEN_COLOR : '#000000',
   TRANSPARENT_COLOR : 'rgba(0, 0, 0, 0)',
@@ -58,8 +60,11 @@ var Constants = {
   // The datastore limit is 1 MiB, which we roughly approximate to 1 million characters.
   APPENGINE_SAVE_LIMIT : 1 * 1024 * 1024,
 
+  // Message displayed when an action will lead to erase the current animation.
+  CONFIRM_OVERWRITE: 'This will replace your current animation, are you sure you want to continue?',
+
   // SERVICE URLS
   APPENGINE_SAVE_URL : 'save',
-  IMAGE_SERVICE_UPLOAD_URL : 'http://piskel-imgstore-b.appspot.com/__/upload',
+  IMAGE_SERVICE_UPLOAD_URL : '{{protocol}}://piskel-imgstore-b.appspot.com/__/upload',
-  IMAGE_SERVICE_GET_URL : 'http://piskel-imgstore-b.appspot.com/img/'
+  IMAGE_SERVICE_GET_URL : '{{protocol}}://piskel-imgstore-b.appspot.com/img/'
 };

src/js/Events.js

@@ -64,9 +64,10 @@ var Events = {
   SELECTION_CREATED: 'SELECTION_CREATED',
   SELECTION_MOVE_REQUEST: 'SELECTION_MOVE_REQUEST',
   SELECTION_DISMISSED: 'SELECTION_DISMISSED',
-  SELECTION_COPY: 'SELECTION_COPY',
+
-  SELECTION_CUT: 'SELECTION_CUT',
+  CLIPBOARD_COPY: 'CLIPBOARD_COPY',
-  SELECTION_PASTE: 'SELECTION_PASTE',
+  CLIPBOARD_CUT: 'CLIPBOARD_CUT',
+  CLIPBOARD_PASTE: 'CLIPBOARD_PASTE',
 
   SHOW_NOTIFICATION: 'SHOW_NOTIFICATION',
   HIDE_NOTIFICATION: 'HIDE_NOTIFICATION',

src/js/app.js

@@ -10,14 +10,14 @@
   ns.app = {
 
     init : function () {
-      // Run preferences migration scripts for version v0.12.0
-      pskl.UserSettings.migrate_to_v0_12();
-
       /**
        * When started from APP Engine, appEngineToken_ (Boolean) should be set on window.pskl
        */
       this.isAppEngineVersion = !!pskl.appEngineToken_;
 
+      // This id is used to keep track of sessions in the BackupService.
+      this.sessionId = pskl.utils.Uuid.generate();
+
       this.shortcutService = new pskl.service.keyboard.ShortcutService();
       this.shortcutService.init();
 
@@ -64,24 +64,24 @@
 
       this.drawingController = new pskl.controller.DrawingController(
         this.piskelController,
-        $('#drawing-canvas-container'));
+        document.querySelector('#drawing-canvas-container'));
       this.drawingController.init();
 
       this.previewController = new pskl.controller.preview.PreviewController(
         this.piskelController,
-        $('#animated-preview-canvas-container'));
+        document.querySelector('#animated-preview-canvas-container'));
       this.previewController.init();
 
       this.minimapController = new pskl.controller.MinimapController(
         this.piskelController,
         this.previewController,
         this.drawingController,
-        $('.minimap-container'));
+        document.querySelector('.minimap-container'));
       this.minimapController.init();
 
       this.framesListController = new pskl.controller.FramesListController(
         this.piskelController,
-        $('#preview-list-wrapper').get(0));
+        document.querySelector('#preview-list-wrapper'));
       this.framesListController.init();
 
       this.layersListController = new pskl.controller.LayersListController(this.piskelController);
@@ -114,6 +114,9 @@
       this.canvasBackgroundController = new pskl.controller.CanvasBackgroundController();
       this.canvasBackgroundController.init();
 
+      this.indexedDbStorageService = new pskl.service.storage.IndexedDbStorageService(this.piskelController);
+      this.indexedDbStorageService.init();
+
       this.localStorageService = new pskl.service.storage.LocalStorageService(this.piskelController);
       this.localStorageService.init();
 
@@ -168,6 +171,9 @@
         this.currentColorsService);
       this.performanceReportService.init();
 
+      this.clipboardService = new pskl.service.ClipboardService(this.piskelController);
+      this.clipboardService.init();
+
       this.drawingLoop = new pskl.rendering.DrawingLoop();
       this.drawingLoop.addCallback(this.render, this);
       this.drawingLoop.start();
@@ -195,6 +201,11 @@
           dialogId : 'unsupported-browser'
         });
       }
+
+      if (pskl.utils.Environment.isDebug()) {
+        pskl.app.shortcutService.registerShortcut(pskl.service.keyboard.Shortcuts.DEBUG.RELOAD_STYLES,
+          window.reloadStyles);
+      }
     },
 
     loadPiskel_ : function (piskelData) {

src/js/controller/CursorCoordinatesController.js

@@ -17,6 +17,8 @@
     $.subscribe(Events.DRAG_START, this.onDragStart_.bind(this));
     $.subscribe(Events.DRAG_END, this.onDragEnd_.bind(this));
     $.subscribe(Events.FRAME_SIZE_CHANGED, this.redraw.bind(this));
+    $.subscribe(Events.ZOOM_CHANGED, this.redraw.bind(this));
+    $.subscribe(Events.PISKEL_RESET, this.redraw.bind(this));
 
     this.redraw();
   };
@@ -39,7 +41,18 @@
       }
     }
 
-    this.coordinatesContainer.innerHTML = this.getFrameSizeHTML_() + html;
+    if (pskl.app.drawingController) {
+      var zoom = pskl.app.drawingController.compositeRenderer.getZoom().toFixed(2);
+      html += '<div class="drawing-zoom">x' + zoom + '</div>';
+    }
+
+    this.coordinatesContainer.innerHTML = this.getFrameSizeHTML_() + html + this.getCurrentFrameIndexHTML_();
+  };
+
+  ns.CursorCoordinatesController.prototype.getCurrentFrameIndexHTML_ = function () {
+    var currentFrameIndex = this.piskelController.getCurrentFrameIndex() + 1;
+    var frameCount = this.piskelController.getFrameCount();
+    return '<div class="frame-info">' + currentFrameIndex + '/' + frameCount + '</div>';
   };
 
   ns.CursorCoordinatesController.prototype.getFrameSizeHTML_ = function () {

src/js/controller/DrawingController.js

@@ -22,7 +22,7 @@
 
     var cfg = {
       'zoom': this.calculateZoom_(),
-      'supportGridRendering' : true,
+      'supportGridRendering' : false,
       'height' : this.getContainerHeight_(),
       'width' : this.getContainerWidth_(),
       'xOffset' : 0,
@@ -30,9 +30,10 @@
     };
 
     this.overlayRenderer = new pskl.rendering.frame.CachedFrameRenderer(this.container, cfg, ['canvas-overlay']);
-    this.renderer = new pskl.rendering.frame.CachedFrameRenderer(this.container, cfg, ['drawing-canvas']);
     this.onionSkinRenderer = pskl.rendering.OnionSkinRenderer.createInContainer(this.container, cfg, piskelController);
     this.layersRenderer = new pskl.rendering.layer.LayersRenderer(this.container, cfg, piskelController);
+    cfg.supportGridRendering = true;
+    this.renderer = new pskl.rendering.frame.CachedFrameRenderer(this.container, cfg, ['drawing-canvas']);
 
     this.compositeRenderer = new pskl.rendering.CompositeRenderer();
     this.compositeRenderer
@@ -50,12 +51,12 @@
   ns.DrawingController.prototype.init = function () {
     this.initMouseBehavior();
 
-    $.subscribe(Events.TOOL_SELECTED, $.proxy(function(evt, toolBehavior) {
+    $.subscribe(Events.TOOL_SELECTED, (function(evt, toolBehavior) {
       this.currentToolBehavior = toolBehavior;
       this.overlayFrame.clear();
-    }, this));
+    }).bind(this));
 
-    $(window).resize($.proxy(this.startResizeTimer_, this));
+    window.addEventListener('resize', this.startResizeTimer_.bind(this));
 
     $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
     $.subscribe(Events.FRAME_SIZE_CHANGED, this.onFrameSizeChange_.bind(this));
@@ -76,13 +77,12 @@
   };
 
   ns.DrawingController.prototype.initMouseBehavior = function() {
-    var body = $('body');
+    this.container.addEventListener('mousedown', this.onMousedown_.bind(this));
-    this.container.mousedown($.proxy(this.onMousedown_, this));
 
     if (pskl.utils.UserAgent.isChrome || pskl.utils.UserAgent.isIE11) {
-      this.container.on('mousewheel', $.proxy(this.onMousewheel_, this));
+      this.container.addEventListener('mousewheel', this.onMousewheel_.bind(this));
     } else {
-      this.container.on('wheel', $.proxy(this.onMousewheel_, this));
+      this.container.addEventListener('wheel', this.onMousewheel_.bind(this));
     }
 
     window.addEventListener('mouseup', this.onMouseup_.bind(this));
@@ -93,22 +93,20 @@
     window.addEventListener('touchend', this.onTouchend_.bind(this));
 
     // Deactivate right click:
-    body.contextmenu(this.onCanvasContextMenu_);
+    document.body.addEventListener('contextmenu', this.onCanvasContextMenu_.bind(this));
-
   };
 
   ns.DrawingController.prototype.startResizeTimer_ = function () {
     if (this.resizeTimer) {
       window.clearInterval(this.resizeTimer);
     }
-    this.resizeTimer = window.setTimeout($.proxy(this.afterWindowResize_, this), 200);
+    this.resizeTimer = window.setTimeout(this.afterWindowResize_.bind(this), 200);
   };
 
   ns.DrawingController.prototype.afterWindowResize_ = function () {
     var initialWidth = this.compositeRenderer.getDisplaySize().width;
 
     this.compositeRenderer.setDisplaySize(this.getContainerWidth_(), this.getContainerHeight_());
-    this.centerColumnWrapperHorizontally_();
     var ratio = this.compositeRenderer.getDisplaySize().width / initialWidth;
     var newZoom = ratio * this.compositeRenderer.getZoom();
     this.compositeRenderer.setZoom(newZoom);
@@ -133,7 +131,6 @@
 
   ns.DrawingController.prototype.onFrameSizeChange_ = function () {
     this.compositeRenderer.setDisplaySize(this.getContainerWidth_(), this.getContainerHeight_());
-    this.centerColumnWrapperHorizontally_();
     this.compositeRenderer.setZoom(this.calculateZoom_());
     this.compositeRenderer.setOffset(0, 0);
     $.publish(Events.ZOOM_CHANGED);
@@ -241,8 +238,7 @@
     $.publish(Events.CURSOR_MOVED, [coords.x, coords.y]);
   };
 
-  ns.DrawingController.prototype.onMousewheel_ = function (jQueryEvent) {
+  ns.DrawingController.prototype.onMousewheel_ = function (evt) {
-    var evt = jQueryEvent.originalEvent;
     // Ratio between wheelDeltaY (mousewheel event) and deltaY (wheel event) is -40
     var delta;
     if (pskl.utils.UserAgent.isIE11) {
@@ -350,6 +346,8 @@
       // Picking color after ALT+click or middle mouse button click.
       this.pickColorAt_(coords);
       this.isPickingColor = false;
+      // Flash the cursor to briefly show the colorpicker cursor.
+      this.flashColorPicker_();
     } else if (isMiddleDrag) {
       // Stop the drag handler after a middle button drag action.
       this.dragHandler.stopDrag();
@@ -385,6 +383,16 @@
     $.publish(evt, [color]);
   };
 
+  ns.DrawingController.prototype.flashColorPicker_ = function () {
+    document.body.classList.add('tool-colorpicker');
+    document.body.classList.remove(this.currentToolBehavior.toolId);
+    window.clearTimeout(this.flashColorPickerTimer);
+    this.flashColorPickerTimer = window.setTimeout(function () {
+      document.body.classList.remove('tool-colorpicker');
+      document.body.classList.add(this.currentToolBehavior.toolId);
+    }.bind(this), 200);
+  };
+
   /**
    * Translate absolute x,y screen coordinates into sprite coordinates
    * @param  {Number} screenX
@@ -403,7 +411,8 @@
    * @private
    */
   ns.DrawingController.prototype.onCanvasContextMenu_ = function (event) {
-    if ($(event.target).closest('#drawing-canvas-container').length) {
+    // closest() not really available everywhere yet, just skip if missing.
+    if (event.target.closest && event.target.closest('#drawing-canvas-container')) {
       // Deactivate right click on drawing canvas only.
       event.preventDefault();
       event.stopPropagation();
@@ -441,17 +450,21 @@
   };
 
   ns.DrawingController.prototype.getAvailableHeight_ = function () {
-    return $('#main-wrapper').height();
+    return document.querySelector('#main-wrapper').getBoundingClientRect().height;
+  };
+
+  ns.DrawingController.prototype.getSelectorWidth_ = function (selector) {
+    return document.querySelector(selector).getBoundingClientRect().width;
   };
 
   ns.DrawingController.prototype.getAvailableWidth_ = function () {
-    var leftSectionWidth = $('.left-column').outerWidth(true);
+    var leftSectionWidth = this.getSelectorWidth_('.left-column');
-    var rightSectionWidth = $('.right-column').outerWidth(true);
+    var rightSectionWidth = this.getSelectorWidth_('.right-column');
-    var toolsContainerWidth = $('#tool-section').outerWidth(true);
+    var toolsContainerWidth = this.getSelectorWidth_('#tool-section');
-    var settingsContainerWidth = $('#application-action-section').outerWidth(true);
+    var settingsContainerWidth = this.getSelectorWidth_('#application-action-section');
 
     var usedWidth = leftSectionWidth + rightSectionWidth + toolsContainerWidth + settingsContainerWidth;
-    var availableWidth = $('#main-wrapper').width() - usedWidth;
+    var availableWidth = this.getSelectorWidth_('#main-wrapper') - usedWidth;
 
     var comfortMargin = 10;
     return availableWidth - comfortMargin;
@@ -465,17 +478,6 @@
     return this.getAvailableWidth_();
   };
 
-  /**
-   * @private
-   */
-  ns.DrawingController.prototype.centerColumnWrapperHorizontally_ = function() {
-    var containerHeight = this.getContainerHeight_();
-    var verticalGapInPixel = Math.floor(($('#main-wrapper').height() - containerHeight) / 2);
-    $('#column-wrapper').css({
-      'top': verticalGapInPixel + 'px'
-    });
-  };
-
   ns.DrawingController.prototype.getRenderer = function () {
     return this.compositeRenderer;
   };

src/js/controller/FramesListController.js

@@ -5,7 +5,8 @@
     SELECT : 'select',
     CLONE : 'clone',
     DELETE : 'delete',
-    NEW_FRAME : 'newframe'
+    NEW_FRAME : 'newframe',
+    TOGGLE: 'toggle'
   };
 
   ns.FramesListController = function (piskelController, container) {
@@ -114,6 +115,8 @@
       this.tiles.push(newtile);
       this.previewList.insertBefore(newtile, this.addFrameTile);
       this.updateScrollerOverflows();
+    } else if (action == ACTION.TOGGLE) {
+      this.piskelController.toggleFrameVisibilityAt(index);
     }
 
     this.flagForRedraw_();
@@ -127,10 +130,18 @@
       // Remove selected class
       this.tiles[i].classList.remove('selected');
 
+      // Remove toggle class
+      this.tiles[i].querySelector('.tile-count').classList.remove('toggled');
+
       // Update tile numbers
       this.tiles[i].setAttribute('data-tile-number', i);
       this.tiles[i].querySelector('.tile-count').innerHTML = (i + 1);
 
+      // Update visibility
+      if (this.piskelController.hasVisibleFrameAt(i)) {
+        this.tiles[i].querySelector('.tile-count').classList.add('toggled');
+      }
+
       // Check if any tile is updated
       var hash = this.piskelController.getCurrentLayer().getFrameAt(i).getHash();
       if (this.tiles[i].getAttribute('data-tile-hash') !== hash) {
@@ -162,7 +173,10 @@
     this.previewList.innerHTML = '';
 
     // Manually remove tooltips since mouseout events were shortcut by the DOM refresh:
-    $('.tooltip').remove();
+    var tooltips = document.querySelectorAll('.tooltip');
+    Array.prototype.forEach.call(tooltips, function (tooltip) {
+      tooltip.parentNode.removeChild(tooltip);
+    });
 
     var frameCount = this.piskelController.getFrameCount();
 
@@ -190,8 +204,8 @@
   ns.FramesListController.prototype.initDragndropBehavior_ = function () {
     $(this.previewList).sortable({
       placeholder: 'preview-tile preview-tile-drop-proxy',
-      update: $.proxy(this.onUpdate_, this),
+      update: this.onUpdate_.bind(this),
-      stop: $.proxy(this.onSortableStop_, this),
+      stop: this.onSortableStop_.bind(this),
       items: '.preview-tile',
       axis: 'y',
       tolerance: 'pointer'
@@ -203,8 +217,10 @@
    * @private
    */
   ns.FramesListController.prototype.onUpdate_ = function (event, ui) {
-    var originFrameId = parseInt(ui.item.data('tile-number'), 10);
+    var movedItem = ui.item.get(0);
-    var targetInsertionId = $('.preview-tile').index(ui.item);
+    var originFrameId = parseInt(movedItem.dataset.tileNumber, 10);
+    var tiles = document.querySelectorAll('.preview-tile');
+    var targetInsertionId = Array.prototype.indexOf.call(tiles, movedItem);
 
     this.piskelController.moveFrame(originFrameId, targetInsertionId);
     this.piskelController.setCurrentFrameIndex(targetInsertionId);
@@ -220,14 +236,13 @@
   ns.FramesListController.prototype.onSortableStop_ = function (event, ui) {
     this.justDropped = true;
 
-    this.resizeTimer = window.setTimeout($.proxy(function() {
+    this.resizeTimer = window.setTimeout((function() {
       this.justDropped = false;
-    }, this), 200);
+    }).bind(this), 200);
   };
 
   /**
    * @private
-   * TODO(vincz): clean this giant rendering function & remove listeners.
    */
   ns.FramesListController.prototype.createPreviewTile_ = function(tileNumber) {
     var currentFrame = this.piskelController.getCurrentLayer().getFrameAt(tileNumber);
@@ -286,8 +301,12 @@
     previewTileRoot.appendChild(dndHandle);
 
     // Add tile count
-    var tileCount = document.createElement('div');
+    var tileCount = document.createElement('button');
-    tileCount.className = 'tile-overlay tile-count';
+    tileCount.setAttribute('rel', 'tooltip');
+    tileCount.setAttribute('title', 'Toggle for preview');
+    tileCount.setAttribute('data-tile-number', tileNumber);
+    tileCount.setAttribute('data-tile-action', ACTION.TOGGLE);
+    tileCount.className = 'tile-overlay tile-count toggle-frame-action';
     tileCount.innerHTML = tileNumber + 1;
     previewTileRoot.appendChild(tileCount);
 

src/js/controller/LayersListController.js

@@ -1,15 +1,18 @@
 (function () {
   var ns = $.namespace('pskl.controller');
 
-  var TOGGLE_LAYER_SHORTCUT = 'alt+L';
-
   ns.LayersListController = function (piskelController) {
     this.piskelController = piskelController;
     this.layerPreviewShortcut = pskl.service.keyboard.Shortcuts.MISC.LAYER_PREVIEW;
+    this.startRenamingCurrentLayer_ = this.startRenamingCurrentLayer_.bind(this);
+    this.onRenameInput_ = this.onRenameInput_.bind(this);
   };
 
   ns.LayersListController.prototype.init = function () {
+    this.isRenaming = false;
+
     this.layerItemTemplate_ = pskl.utils.Template.get('layer-item-template');
+    this.layerNameInputTemplate_ = pskl.utils.Template.get('layer-name-input-template');
     this.rootEl = document.querySelector('.layers-list-container');
     this.layersListEl = document.querySelector('.layers-list');
     this.toggleLayerPreviewEl = document.querySelector('.layers-toggle-preview');
@@ -24,7 +27,7 @@
     this.updateToggleLayerPreview_();
 
     $.subscribe(Events.PISKEL_RESET, this.renderLayerList_.bind(this));
-    $.subscribe(Events.USER_SETTINGS_CHANGED, $.proxy(this.onUserSettingsChange_, this));
+    $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
   };
 
   ns.LayersListController.prototype.renderLayerList_ = function () {
@@ -77,7 +80,6 @@
 
   ns.LayersListController.prototype.updateButtonStatus_ = function () {
     var layers = this.piskelController.getLayers();
-    var currentLayer = this.piskelController.getCurrentLayer();
     var index = this.piskelController.getCurrentLayerIndex();
 
     var isLast = index === 0;
@@ -118,6 +120,7 @@
 
   ns.LayersListController.prototype.addLayerItem = function (layer, index) {
     var isSelected = this.piskelController.getCurrentLayer() === layer;
+    var isRenaming = isSelected && this.isRenaming;
     var layerItemHtml = pskl.utils.Template.replace(this.layerItemTemplate_, {
       'layername' : layer.getName(),
       'layerindex' : index,
@@ -127,10 +130,36 @@
     var layerItem = pskl.utils.Template.createFromHTML(layerItemHtml);
     this.layersListEl.insertBefore(layerItem, this.layersListEl.firstChild);
     if (layerItem.offsetWidth < layerItem.scrollWidth) {
-      $(layerItem).find('.layer-name')
+      var layerNameEl = layerItem.querySelector('.layer-name');
-        .addClass('overflowing-name')
+      layerNameEl.classList.add('overflowing-name');
-        .attr('title', layer.getName())
+      layerNameEl.setAttribute('title', layer.getName());
-        .tooltip();
+      layerNameEl.setAttribute('rel', 'tooltip');
+    }
+    if (isSelected) {
+      layerItem.removeEventListener('dblclick', this.startRenamingCurrentLayer_);
+      layerItem.addEventListener('dblclick', this.startRenamingCurrentLayer_);
+    }
+    if (isRenaming) {
+      var layerNameInputHtml = pskl.utils.Template.replace(this.layerNameInputTemplate_, {
+        'layername' : layer.getName()
+      });
+      var layerNameInput = pskl.utils.Template.createFromHTML(layerNameInputHtml);
+      var layerNameEl = layerItem.querySelector('.layer-name');
+      layerItem.replaceChild(layerNameInput, layerNameEl);
+      layerNameInput.removeEventListener('blur', this.onRenameInput_);
+      layerNameInput.removeEventListener('keydown', this.onRenameInput_);
+      layerNameInput.addEventListener('blur', this.onRenameInput_);
+      layerNameInput.addEventListener('keydown', this.onRenameInput_);
+      layerNameInput.focus();
+      layerNameInput.select();
+    }
+    var opacity = layer.getOpacity();
+    if (opacity == 1) {
+      layerItem.querySelector('.layer-item-opacity').style.color = '#ffd700';
+    } else if (opacity == 0) {
+      layerItem.querySelector('.layer-item-opacity').style.color = '#969696';
+    } else {
+      layerItem.querySelector('.layer-item-opacity').style.color = '#ffffff';
     }
   };
 
@@ -140,8 +169,13 @@
     if (el.classList.contains('button')) {
       this.onButtonClick_(el, evt);
     } else if (el.classList.contains('layer-name')) {
+      var currentIndex = this.piskelController.getCurrentLayerIndex();
       index = pskl.utils.Dom.getData(el, 'layerIndex');
+      if (index != currentIndex) {
+        var currentItem = el.parentElement.parentElement.querySelector('.current-layer-item');
+        currentItem.removeEventListener('dblclick', this.startRenamingCurrentLayer_);
         this.piskelController.setCurrentLayerIndex(parseInt(index, 10));
+      }
     } else if (el.classList.contains('layer-item-opacity')) {
       index = pskl.utils.Dom.getData(el, 'layerIndex');
       var layer = this.piskelController.getLayerAt(parseInt(index, 10));
@@ -150,16 +184,31 @@
     }
   };
 
-  ns.LayersListController.prototype.renameCurrentLayer_ = function () {
+  ns.LayersListController.prototype.startRenamingCurrentLayer_ = function () {
-    var layer = this.piskelController.getCurrentLayer();
+    this.isRenaming = true;
-    var name = window.prompt('Please enter the layer name', layer.getName());
-    if (name) {
-      var index = this.piskelController.getCurrentLayerIndex();
-      this.piskelController.renameLayerAt(index, name);
     this.renderLayerList_();
+  };
+
+  ns.LayersListController.prototype.onRenameInput_ = function (evt) {
+    var el = evt.target || evt.srcElement;
+    if (evt.key === 'Enter') {
+      this.finishRenamingCurrentLayer_(el, el.value);
+    } else if (!evt.key || evt.key === 'Escape') {
+      this.finishRenamingCurrentLayer_(el);
     }
   };
 
+  ns.LayersListController.prototype.finishRenamingCurrentLayer_ = function (input, newName) {
+    if (newName) {
+      var index = this.piskelController.getCurrentLayerIndex();
+      this.piskelController.renameLayerAt(index, newName);
+    }
+    input.removeEventListener('blur', this.onRenameInput_);
+    input.removeEventListener('keydown', this.onRenameInput_);
+    this.isRenaming = false;
+    this.renderLayerList_();
+  };
+
   ns.LayersListController.prototype.mergeDownCurrentLayer_ = function () {
     var index = this.piskelController.getCurrentLayerIndex();
     this.piskelController.mergeDownLayerAt(index);
@@ -183,7 +232,7 @@
     } else if (action == 'merge') {
       this.mergeDownCurrentLayer_();
     } else if (action == 'edit') {
-      this.renameCurrentLayer_();
+      this.startRenamingCurrentLayer_();
     }
   };
 

src/js/controller/MinimapController.js

@@ -16,14 +16,14 @@
     this.minimapEl = document.createElement('DIV');
     this.minimapEl.className = 'minimap-crop-frame';
     this.minimapEl.style.display = 'none';
-    $(this.container).append(this.minimapEl);
+    this.container.appendChild(this.minimapEl);
 
     // Init mouse events
-    $(this.container).mousedown(this.onMinimapMousedown_.bind(this));
+    this.container.addEventListener('mousedown', this.onMinimapMousedown_.bind(this));
-    $('body').mousemove(this.onMinimapMousemove_.bind(this));
+    document.body.addEventListener('mousemove', this.onMinimapMousemove_.bind(this));
-    $('body').mouseup(this.onMinimapMouseup_.bind(this));
+    document.body.addEventListener('mouseup', this.onMinimapMouseup_.bind(this));
 
-    $.subscribe(Events.ZOOM_CHANGED, $.proxy(this.renderMinimap_, this));
+    $.subscribe(Events.ZOOM_CHANGED, this.renderMinimap_.bind(this));
   };
 
   ns.MinimapController.prototype.renderMinimap_ = function () {
@@ -40,8 +40,9 @@
     var minimapSize = this.getMinimapSize_();
     var previewSize = this.getPreviewSize_();
 
-    var containerHeight = this.container.height();
+    var containerRect = this.container.getBoundingClientRect();
-    var containerWidth = this.container.width();
+    var containerHeight = containerRect.height;
+    var containerWidth = containerRect.width;
 
     // offset(x, y) in frame pixels
     var offset = this.drawingController.getRenderer().getOffset();
@@ -60,7 +61,7 @@
     this.minimapEl.style.display = 'block';
     this.minimapEl.style.width = Math.min(minimapSize.width, containerWidth) + 'px';
     this.minimapEl.style.height = Math.min(minimapSize.height, containerHeight) + 'px';
-    this.minimapEl.style.left = Math.max(0, left) +  'px';
+    this.minimapEl.style.left = (Math.max(0, left) + Constants.RIGHT_COLUMN_PADDING_LEFT) +  'px';
     this.minimapEl.style.top = Math.max(0, top) +  'px';
 
     this.isVisible = true;

src/js/controller/NotificationController.js

@@ -7,8 +7,8 @@
    * @public
    */
   ns.NotificationController.prototype.init = function() {
-    $.subscribe(Events.SHOW_NOTIFICATION, $.proxy(this.displayMessage_, this));
+    $.subscribe(Events.SHOW_NOTIFICATION, this.displayMessage_.bind(this));
-    $.subscribe(Events.HIDE_NOTIFICATION, $.proxy(this.removeMessage_, this));
+    $.subscribe(Events.HIDE_NOTIFICATION, this.removeMessage_.bind(this));
   };
 
   /**
@@ -35,9 +35,9 @@
    * @private
    */
   ns.NotificationController.prototype.removeMessage_ = function (evt) {
-    var message = $('#user-message');
+    var message = document.querySelector('#user-message');
-    if (message.length) {
+    if (message) {
-      message.remove();
+      message.parentNode.removeChild(message);
     }
   };
 })();

src/js/controller/PaletteController.js

@@ -35,24 +35,24 @@
     // Initialize colorpickers:
     var colorPicker = $('#color-picker');
     colorPicker.spectrum($.extend({color: Constants.DEFAULT_PEN_COLOR}, spectrumCfg));
-    colorPicker.change({isPrimary : true}, $.proxy(this.onPickerChange_, this));
+    colorPicker.change({isPrimary : true}, this.onPickerChange_.bind(this));
-    this.setTitleOnPicker_(Constants.DEFAULT_PEN_COLOR, colorPicker);
+    this.setTitleOnPicker_(Constants.DEFAULT_PEN_COLOR, colorPicker.get(0));
 
     var secondaryColorPicker = $('#secondary-color-picker');
     secondaryColorPicker.spectrum($.extend({color: Constants.TRANSPARENT_COLOR}, spectrumCfg));
-    secondaryColorPicker.change({isPrimary : false}, $.proxy(this.onPickerChange_, this));
+    secondaryColorPicker.change({isPrimary : false}, this.onPickerChange_.bind(this));
-    this.setTitleOnPicker_(Constants.TRANSPARENT_COLOR, secondaryColorPicker);
+    this.setTitleOnPicker_(Constants.TRANSPARENT_COLOR, secondaryColorPicker.get(0));
 
-    var swapColorsIcon = $('.swap-colors-button');
+    var swapColorsIcon = document.querySelector('.swap-colors-button');
-    swapColorsIcon.click(this.swapColors.bind(this));
+    swapColorsIcon.addEventListener('click', this.swapColors.bind(this));
   };
 
   /**
    * @private
    */
-  ns.PaletteController.prototype.onPickerChange_ = function(evt, isPrimary) {
+  ns.PaletteController.prototype.onPickerChange_ = function(evt) {
-    var inputPicker = $(evt.target);
+    var inputPicker = evt.target;
-    var color = inputPicker.val();
+    var color = inputPicker.value;
 
     if (color != Constants.TRANSPARENT_COLOR) {
       // Unless the color is TRANSPARENT_COLOR, format it to hexstring, as
@@ -71,7 +71,6 @@
    * @private
    */
   ns.PaletteController.prototype.onColorSelected_ = function(args, evt, color) {
-    var inputPicker = $(evt.target);
     if (args.isPrimary) {
       this.setPrimaryColor_(color);
     } else {
@@ -80,12 +79,12 @@
   };
 
   ns.PaletteController.prototype.setPrimaryColor_ = function (color) {
-    this.updateColorPicker_(color, $('#color-picker'));
+    this.updateColorPicker_(color, document.querySelector('#color-picker'));
     $.publish(Events.PRIMARY_COLOR_SELECTED, [color]);
   };
 
   ns.PaletteController.prototype.setSecondaryColor_ = function (color) {
-    this.updateColorPicker_(color, $('#secondary-color-picker'));
+    this.updateColorPicker_(color, document.querySelector('#secondary-color-picker'));
     $.publish(Events.SECONDARY_COLOR_SELECTED, [color]);
   };
 
@@ -104,6 +103,7 @@
    * @private
    */
   ns.PaletteController.prototype.updateColorPicker_ = function (color, colorPicker) {
+    var jqueryColorPicker = $(colorPicker);
     if (color == Constants.TRANSPARENT_COLOR) {
       // We can set the current palette color to transparent.
       // You can then combine this transparent color with an advanced
@@ -114,17 +114,17 @@
       // The colorpicker can't be set to a transparent state.
       // We set its background to white and insert the
       // string "TRANSPARENT" to mimic this state:
-      colorPicker.spectrum('set', Constants.TRANSPARENT_COLOR);
+      jqueryColorPicker.spectrum('set', Constants.TRANSPARENT_COLOR);
-      colorPicker.val(Constants.TRANSPARENT_COLOR);
+      colorPicker.value = Constants.TRANSPARENT_COLOR;
     } else {
-      colorPicker.spectrum('set', color);
+      jqueryColorPicker.spectrum('set', color);
     }
     this.setTitleOnPicker_(color, colorPicker);
   };
 
   ns.PaletteController.prototype.setTitleOnPicker_ = function (title, colorPicker) {
-    var parent = colorPicker.parent();
+    var parent = colorPicker.parentNode;
-    title = parent.data('initial-title') + '<br/>' + title;
+    title = parent.dataset.initialTitle + '<br/>' + title;
-    parent.attr('data-original-title', title);
+    parent.dataset.originalTitle = title;
   };
 })();

src/js/controller/PalettesListController.js

@@ -29,7 +29,7 @@
     $.subscribe(Events.CURRENT_COLORS_UPDATED, this.fillColorListContainer.bind(this));
     $.subscribe(Events.PRIMARY_COLOR_SELECTED, this.highlightSelectedColors.bind(this));
     $.subscribe(Events.SECONDARY_COLOR_SELECTED, this.highlightSelectedColors.bind(this));
-    $.subscribe(Events.USER_SETTINGS_CHANGED, $.proxy(this.onUserSettingsChange_, this));
+    $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
 
     var shortcuts = pskl.service.keyboard.Shortcuts;
     pskl.app.shortcutService.registerShortcut(shortcuts.COLOR.PREVIOUS_COLOR, this.selectPreviousColor_.bind(this));
@@ -54,7 +54,9 @@
     var colors = this.getSelectedPaletteColors_();
 
     if (colors.length > 0) {
-      var html = colors.map(function (color, index) {
+      var html = colors.filter(function (color) {
+        return !!color;
+      }).map(function (color, index) {
         return pskl.utils.Template.replace(this.paletteColorTemplate_, {
           color : color,
           index : index + 1,

src/js/controller/ProgressBarController.js

@@ -10,9 +10,9 @@
   };
 
   ns.ProgressBarController.prototype.init = function () {
-    $.subscribe(Events.SHOW_PROGRESS, $.proxy(this.showProgress_, this));
+    $.subscribe(Events.SHOW_PROGRESS, this.showProgress_.bind(this));
-    $.subscribe(Events.UPDATE_PROGRESS, $.proxy(this.updateProgress_, this));
+    $.subscribe(Events.UPDATE_PROGRESS, this.updateProgress_.bind(this));
-    $.subscribe(Events.HIDE_PROGRESS, $.proxy(this.hideProgress_, this));
+    $.subscribe(Events.HIDE_PROGRESS, this.hideProgress_.bind(this));
   };
 
   ns.ProgressBarController.prototype.showProgress_ = function (event, progressInfo) {

src/js/controller/ToolController.js

@@ -35,7 +35,8 @@
     // Set SimplePen as default selected tool:
     this.selectTool_(this.tools[0]);
     // Activate listener on tool panel:
-    $('#tool-section').mousedown($.proxy(this.onToolIconClicked_, this));
+    var toolSection = document.querySelector('#tool-section');
+    toolSection.addEventListener('mousedown', this.onToolIconClicked_.bind(this));
 
     $.subscribe(Events.SELECT_TOOL, this.onSelectToolEvent_.bind(this));
     $.subscribe(Events.SHORTCUTS_CHANGED, this.createToolsDom_.bind(this));
@@ -45,14 +46,14 @@
    * @private
    */
   ns.ToolController.prototype.activateToolOnStage_ = function(tool) {
-    var stage = $('body');
+    var stage = document.body;
-    var previousSelectedToolClass = stage.data('selected-tool-class');
+    var previousSelectedToolClass = stage.dataset.selectedToolClass;
     if (previousSelectedToolClass) {
-      stage.removeClass(previousSelectedToolClass);
+      stage.classList.remove(previousSelectedToolClass);
-      stage.removeClass(pskl.tools.drawing.Move.TOOL_ID);
+      stage.classList.remove(pskl.tools.drawing.Move.TOOL_ID);
     }
-    stage.addClass(tool.toolId);
+    stage.classList.add(tool.toolId);
-    stage.data('selected-tool-class', tool.toolId);
+    stage.dataset.selectedToolClass = tool.toolId;
   };
 
   ns.ToolController.prototype.onSelectToolEvent_ = function(event, toolId) {
@@ -69,11 +70,13 @@
     this.currentSelectedTool = tool;
     this.activateToolOnStage_(this.currentSelectedTool);
 
-    var selectedToolElement = $('#tool-section .tool-icon.selected');
+    var selectedToolElement = document.querySelector('#tool-section .tool-icon.selected');
-    var toolElement = $('[data-tool-id=' + tool.toolId + ']');
+    if (selectedToolElement) {
+      selectedToolElement.classList.remove('selected');
+    }
 
-    selectedToolElement.removeClass('selected');
+    var toolElement = document.querySelector('[data-tool-id=' + tool.toolId + ']');
-    toolElement.addClass('selected');
+    toolElement.classList.add('selected');
 
     $.publish(Events.TOOL_SELECTED, [tool]);
   };
@@ -82,11 +85,11 @@
    * @private
    */
   ns.ToolController.prototype.onToolIconClicked_ = function(evt) {
-    var target = $(evt.target);
+    var target = evt.target;
-    var clickedTool = target.closest('.tool-icon');
+    var clickedTool = pskl.utils.Dom.getParentWithData(target, 'toolId');
 
-    if (clickedTool.length) {
+    if (clickedTool) {
-      var toolId = clickedTool.data().toolId;
+      var toolId = clickedTool.dataset.toolId;
       var tool = this.getToolById_(toolId);
       if (tool) {
         this.selectTool_(tool);
@@ -116,7 +119,7 @@
       var tool = this.tools[i];
       html += this.toolIconBuilder.createIcon(tool);
     }
-    $('#tools-container').html(html);
+    document.querySelector('#tools-container').innerHTML = html;
   };
 
   ns.ToolController.prototype.addKeyboardShortcuts_ = function () {

src/js/controller/dialogs/BrowseLocalController.js

@@ -10,13 +10,12 @@
 
     this.localStorageItemTemplate_ = pskl.utils.Template.get('local-storage-item-template');
 
-    this.service_ = pskl.app.localStorageService;
+    this.service_ = pskl.app.indexedDbStorageService;
-    this.piskelList = $('.local-piskel-list');
+    this.piskelList = document.querySelector('.local-piskel-list');
-    this.prevSessionContainer = $('.previous-session');
 
     this.fillLocalPiskelsList_();
 
-    this.piskelList.click(this.onPiskelsListClick_.bind(this));
+    this.piskelList.addEventListener('click', this.onPiskelsListClick_.bind(this));
   };
 
   ns.BrowseLocalController.prototype.onPiskelsListClick_ = function (evt) {
@@ -36,9 +35,8 @@
   };
 
   ns.BrowseLocalController.prototype.fillLocalPiskelsList_ = function () {
+    this.service_.getKeys().then(function (keys) {
       var html = '';
-    var keys = this.service_.getKeys();
-
       keys.sort(function (k1, k2) {
         if (k1.date < k2.date) {return 1;}
         if (k1.date > k2.date) {return -1;}
@@ -53,7 +51,8 @@
         });
       }).bind(this));
 
-    var tableBody_ = this.piskelList.get(0).tBodies[0];
+      var tableBody_ = this.piskelList.tBodies[0];
       tableBody_.innerHTML = html;
+    }.bind(this));
   };
 })();

src/js/controller/dialogs/DialogsController.js

@@ -25,6 +25,10 @@
     'unsupported-browser' : {
       template : 'templates/dialogs/unsupported-browser.html',
       controller : ns.UnsupportedBrowserController
+    },
+    'browse-backups' : {
+      template : 'templates/dialogs/browse-backups.html',
+      controller : ns.backups.BrowseBackups
     }
   };
 

src/js/controller/dialogs/backups/BrowseBackups.js

@@ -0,0 +1,81 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.backups');
+
+  var stepDefinitions = {
+    'SELECT_SESSION' : {
+      controller : ns.steps.SelectSession,
+      template : 'backups-select-session'
+    },
+    'SESSION_DETAILS' : {
+      controller : ns.steps.SessionDetails,
+      template : 'backups-session-details'
+    },
+  };
+
+  ns.BrowseBackups = function (piskelController, args) {
+    this.piskelController = piskelController;
+
+    // Backups data object used by steps to communicate and share their
+    // results.
+    this.backupsData = {
+      sessions: [],
+      selectedSession : null
+    };
+  };
+
+  pskl.utils.inherit(ns.BrowseBackups, pskl.controller.dialogs.AbstractDialogController);
+
+  ns.BrowseBackups.prototype.init = function () {
+    this.superclass.init.call(this);
+
+    // Prepare wizard steps.
+    this.steps = this.createSteps_();
+
+    // Start wizard widget.
+    var wizardContainer = document.querySelector('.backups-wizard-container');
+    this.wizard = new pskl.widgets.Wizard(this.steps, wizardContainer);
+    this.wizard.init();
+
+    this.wizard.goTo('SELECT_SESSION');
+  };
+
+  ns.BrowseBackups.prototype.back = function () {
+    this.wizard.back();
+    this.wizard.getCurrentStep().instance.onShow();
+  };
+
+  ns.BrowseBackups.prototype.next = function () {
+    var step = this.wizard.getCurrentStep();
+    if (step.name === 'SELECT_SESSION') {
+      this.wizard.goTo('SESSION_DETAILS');
+    }
+  };
+
+  ns.BrowseBackups.prototype.destroy = function (file) {
+    Object.keys(this.steps).forEach(function (stepName) {
+      var step = this.steps[stepName];
+      step.instance.destroy();
+      step.instance = null;
+      step.el = null;
+    }.bind(this));
+
+    this.superclass.destroy.call(this);
+  };
+
+  ns.BrowseBackups.prototype.createSteps_ = function () {
+    var steps = {};
+    Object.keys(stepDefinitions).forEach(function (stepName) {
+      var definition = stepDefinitions[stepName];
+      var el = pskl.utils.Template.getAsHTML(definition.template);
+      var instance = new definition.controller(this.piskelController, this, el);
+      instance.init();
+      steps[stepName] = {
+        name: stepName,
+        el: el,
+        instance: instance
+      };
+    }.bind(this));
+
+    return steps;
+  };
+})();

src/js/controller/dialogs/backups/steps/SelectSession.js

@@ -0,0 +1,101 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.backups.steps');
+
+  // Should match the transition duration for.session-item defined in dialogs-browse-backups.css
+  var DELETE_TRANSITION_DURATION = 500;
+  /**
+   * Helper that returns a promise that will resolve after waiting for a
+   * given time (in ms).
+   *
+   * @param {Number} time
+   *        The time to wait.
+   * @return {Promise} promise that resolves after time.
+   */
+  var wait = function (time) {
+    var deferred = Q.defer();
+    setTimeout(function () {
+      deferred.resolve();
+    }, time);
+    return deferred.promise;
+  };
+
+  ns.SelectSession = function (piskelController, backupsController, container) {
+    this.piskelController = piskelController;
+    this.backupsController = backupsController;
+    this.container = container;
+  };
+
+  ns.SelectSession.prototype.addEventListener = function (el, type, cb) {
+    pskl.utils.Event.addEventListener(el, type, cb, this);
+  };
+
+  ns.SelectSession.prototype.init = function () {
+    this.addEventListener(this.container, 'click', this.onContainerClick_);
+  };
+
+  ns.SelectSession.prototype.onShow = function () {
+    this.update();
+  };
+
+  ns.SelectSession.prototype.update = function () {
+    pskl.app.backupService.list().then(function (sessions) {
+      var html = this.getMarkupForSessions_(sessions);
+      this.container.querySelector('.session-list').innerHTML = html;
+    }.bind(this)).catch(function () {
+      var html = pskl.utils.Template.get('session-list-error');
+      this.container.querySelector('.session-list').innerHTML = html;
+    }.bind(this));
+  };
+
+  ns.SelectSession.prototype.getMarkupForSessions_ = function (sessions) {
+    if (sessions.length === 0) {
+      return pskl.utils.Template.get('session-list-empty');
+    }
+
+    var sessionItemTemplate = pskl.utils.Template.get('session-list-item');
+    return sessions.reduce(function (previous, session) {
+      if (session.id === pskl.app.sessionId) {
+        // Do not show backups for the current session.
+        return previous;
+      }
+      var view = {
+        id: session.id,
+        name: session.name,
+        description: session.description ? '- ' + session.description : '',
+        date: pskl.utils.DateUtils.format(session.endDate, 'the {{Y}}/{{M}}/{{D}} at {{H}}:{{m}}'),
+        count: session.count === 1 ? '1 snapshot' : session.count + ' snapshots'
+      };
+      return previous + pskl.utils.Template.replace(sessionItemTemplate, view);
+    }, '');
+  };
+
+  ns.SelectSession.prototype.destroy = function () {
+    pskl.utils.Event.removeAllEventListeners(this);
+  };
+
+  ns.SelectSession.prototype.onContainerClick_ = function (evt) {
+    var sessionId = evt.target.dataset.sessionId;
+    if (!sessionId) {
+      return;
+    }
+
+    var action = evt.target.dataset.action;
+    if (action == 'view') {
+      this.backupsController.backupsData.selectedSession = sessionId;
+      this.backupsController.next();
+    } else if (action == 'delete') {
+      if (window.confirm('Are you sure you want to delete this session?')) {
+        evt.target.closest('.session-item').classList.add('deleting');
+        Q.all([
+          pskl.app.backupService.deleteSession(sessionId),
+          // Wait for 500ms for the .hide opacity transition.
+          wait(DELETE_TRANSITION_DURATION)
+        ]).then(function () {
+          // Refresh the list of sessions
+          this.update();
+        }.bind(this));
+      }
+    }
+  };
+
+})();

src/js/controller/dialogs/backups/steps/SessionDetails.js

@@ -0,0 +1,102 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.backups.steps');
+
+  // Should match the preview dimensions defined in dialogs-browse-backups.css
+  var PREVIEW_SIZE = 60;
+
+  ns.SessionDetails = function (piskelController, backupsController, container) {
+    this.piskelController = piskelController;
+    this.backupsController = backupsController;
+    this.container = container;
+  };
+
+  ns.SessionDetails.prototype.init = function () {
+    this.backButton = this.container.querySelector('.back-button');
+    this.addEventListener(this.backButton, 'click', this.onBackClick_);
+    this.addEventListener(this.container, 'click', this.onContainerClick_);
+  };
+
+  ns.SessionDetails.prototype.destroy = function () {
+    pskl.utils.Event.removeAllEventListeners(this);
+  };
+
+  ns.SessionDetails.prototype.addEventListener = function (el, type, cb) {
+    pskl.utils.Event.addEventListener(el, type, cb, this);
+  };
+
+  ns.SessionDetails.prototype.onShow = function () {
+    var sessionId = this.backupsController.backupsData.selectedSession;
+    pskl.app.backupService.getSnapshotsBySessionId(sessionId).then(function (snapshots) {
+      var html = this.getMarkupForSnapshots_(snapshots);
+      this.container.querySelector('.snapshot-list').innerHTML = html;
+
+      // Load the image of the first frame for each sprite and update the list.
+      snapshots.forEach(function (snapshot) {
+        this.updateSnapshotPreview_(snapshot);
+      }.bind(this));
+    }.bind(this)).catch(function () {
+      var html = pskl.utils.Template.get('snapshot-list-error');
+      this.container.querySelector('.snapshot-list').innerHTML = html;
+    }.bind(this));
+  };
+
+  ns.SessionDetails.prototype.getMarkupForSnapshots_ = function (snapshots) {
+    if (snapshots.length === 0) {
+      // This should normally never happen, all sessions have at least one snapshot and snapshots
+      // can not be individually deleted.
+      console.warn('Could not retrieve snapshots for a session');
+      return pskl.utils.Template.get('snapshot-list-empty');
+    }
+
+    var sessionItemTemplate = pskl.utils.Template.get('snapshot-list-item');
+    return snapshots.reduce(function (previous, snapshot) {
+      var view = {
+        id: snapshot.id,
+        name: snapshot.name,
+        description: snapshot.description ? '- ' + snapshot.description : '',
+        date: pskl.utils.DateUtils.format(snapshot.date, 'the {{Y}}/{{M}}/{{D}} at {{H}}:{{m}}'),
+        frames: snapshot.frames === 1 ? '1 frame' : snapshot.frames + ' frames',
+        resolution: pskl.utils.StringUtils.formatSize(snapshot.width, snapshot.height),
+        fps: snapshot.fps
+      };
+      return previous + pskl.utils.Template.replace(sessionItemTemplate, view);
+    }, '');
+  };
+
+  ns.SessionDetails.prototype.updateSnapshotPreview_ = function (snapshot) {
+    pskl.utils.serialization.Deserializer.deserialize(
+      JSON.parse(snapshot.serialized),
+      function (piskel) {
+        var selector = '.snapshot-item[data-snapshot-id="' + snapshot.id + '"] .snapshot-preview';
+        var previewContainer = this.container.querySelector(selector);
+        if (!previewContainer) {
+          return;
+        }
+        var image = this.getFirstFrameAsImage_(piskel);
+        previewContainer.appendChild(image);
+      }.bind(this)
+    );
+  };
+
+  ns.SessionDetails.prototype.getFirstFrameAsImage_ = function (piskel) {
+    var frame = pskl.utils.LayerUtils.mergeFrameAt(piskel.getLayers(), 0);
+    var wZoom = PREVIEW_SIZE / piskel.width;
+    var hZoom = PREVIEW_SIZE / piskel.height;
+    var zoom = Math.min(hZoom, wZoom);
+    return pskl.utils.FrameUtils.toImage(frame, zoom);
+  };
+
+  ns.SessionDetails.prototype.onBackClick_ = function () {
+    this.backupsController.back(this);
+  };
+
+  ns.SessionDetails.prototype.onContainerClick_ = function (evt) {
+    var action = evt.target.dataset.action;
+    if (action == 'load' && window.confirm(Constants.CONFIRM_OVERWRITE)) {
+      var snapshotId = evt.target.dataset.snapshotId * 1;
+      pskl.app.backupService.loadSnapshotById(snapshotId).then(function () {
+        $.publish(Events.DIALOG_HIDE);
+      });
+    }
+  };
+})();

src/js/controller/dialogs/importwizard/ImportWizard.js

@@ -80,7 +80,13 @@
     var step = this.wizard.getCurrentStep();
 
     if (step.name === 'IMAGE_IMPORT') {
+      if (this.piskelController.isEmpty()) {
+        // If the current sprite is empty finalize immediately and replace the current sprite.
+        this.mergeData.importMode = ns.steps.SelectMode.MODES.REPLACE;
+        this.finalizeImport_();
+      } else {
         this.wizard.goTo('SELECT_MODE');
+      }
     } else if (step.name === 'SELECT_MODE') {
       if (this.mergeData.importMode === ns.steps.SelectMode.MODES.REPLACE) {
         this.finalizeImport_();
@@ -144,9 +150,7 @@
 
     if (mode === ns.steps.SelectMode.MODES.REPLACE) {
       // Replace the current piskel and close the dialog.
-      var message = 'This will replace your current animation,' +
+      if (window.confirm(Constants.CONFIRM_OVERWRITE)) {
-                      ' are you sure you want to continue?';
-      if (window.confirm(message)) {
         this.piskelController.setPiskel(piskel);
         this.closeDialog();
       }

src/js/controller/dialogs/importwizard/steps/AdjustSize.js

@@ -69,16 +69,15 @@
     var anchorInfo = this.container.querySelector('.import-resize-anchor-info');
     if (isBigger && keep) {
       anchorInfo.innerHTML = [
-        '<span class="import-resize-warning">',
+        '<div class="import-resize-warning">',
         '  Imported content will be cropped!',
-        '</span>',
+        '</div>',
-        ' ',
+        'Select crop anchor:'
-        'Select crop origin'
       ].join('');
     } else if (isBigger) {
-      anchorInfo.innerHTML = 'Select the anchor for resizing the canvas';
+      anchorInfo.innerHTML = 'Select resize anchor:';
     } else {
-      anchorInfo.innerHTML = 'Select where the import should be positioned';
+      anchorInfo.innerHTML = 'Select position anchor:';
     }
   };
 

src/js/controller/dialogs/importwizard/steps/ImageImport.js

@@ -42,12 +42,17 @@
     this.addEventListener(this.frameOffsetY, 'keyup', this.onFrameInputKeyUp_);
 
     pskl.utils.FileUtils.readImageFile(this.file_, this.onImageLoaded_.bind(this));
+
+    if (this.piskelController.isEmpty()) {
+      this.nextButton.textContent = 'import';
+    }
   };
 
   ns.ImageImport.prototype.onNextClick = function () {
     this.container.classList.add('import-image-loading');
     this.createPiskelFromImage().then(function (piskel) {
       this.mergeData.mergePiskel = piskel;
+      this.container.classList.remove('import-image-loading');
       this.superclass.onNextClick.call(this);
     }.bind(this)).catch(function (e) {
       console.error(e);
@@ -257,9 +262,7 @@
         context.lineTo(maxWidth * scaleX, y * scaleY);
       }
 
-      // Set the line style to dashed
       context.lineWidth = 1;
-      // context.setLineDash([2, 1]);
       context.strokeStyle = 'gold';
       context.stroke();
 

src/js/controller/piskel/PiskelController.js

@@ -122,6 +122,17 @@
       l.addFrameAt(this.createEmptyFrame_(), index);
     }.bind(this));
 
+    this.onFrameAddedAt_(index);
+  };
+
+  ns.PiskelController.prototype.onFrameAddedAt_ = function (index) {
+    this.piskel.hiddenFrames = this.piskel.hiddenFrames.map(function (hiddenIndex) {
+      if (hiddenIndex >= index) {
+        return hiddenIndex + 1;
+      }
+      return hiddenIndex;
+    });
+
     this.setCurrentFrameIndex(index);
   };
 
@@ -135,6 +146,15 @@
     this.getLayers().forEach(function (l) {
       l.removeFrameAt(index);
     });
+
+    // Update the array of hidden frames since some hidden indexes might have shifted.
+    this.piskel.hiddenFrames = this.piskel.hiddenFrames.map(function (hiddenIndex) {
+      if (hiddenIndex > index) {
+        return hiddenIndex - 1;
+      }
+      return hiddenIndex;
+    });
+
     // Current frame index is impacted if the removed frame was before the current frame
     if (this.currentFrameIndex >= index && this.currentFrameIndex > 0) {
       this.setCurrentFrameIndex(this.currentFrameIndex - 1);
@@ -149,13 +169,64 @@
     this.getLayers().forEach(function (l) {
       l.duplicateFrameAt(index);
     });
-    this.setCurrentFrameIndex(index + 1);
+    this.onFrameAddedAt_(index + 1);
+  };
+
+  /**
+   * Toggle frame visibility for the frame at the provided index.
+   * A visible frame will be included in the animated preview.
+   */
+  ns.PiskelController.prototype.toggleFrameVisibilityAt = function (index) {
+    var hiddenFrames = this.piskel.hiddenFrames;
+    if (hiddenFrames.indexOf(index) === -1) {
+      hiddenFrames.push(index);
+    } else {
+      hiddenFrames = hiddenFrames.filter(function (i) {
+        return i !== index;
+      });
+    }
+
+    // Keep the hiddenFrames array sorted.
+    this.piskel.hiddenFrames = hiddenFrames.sort();
   };
 
   ns.PiskelController.prototype.moveFrame = function (fromIndex, toIndex) {
     this.getLayers().forEach(function (l) {
       l.moveFrame(fromIndex, toIndex);
     });
+
+    // Update the array of hidden frames since some hidden indexes might have shifted.
+    this.piskel.hiddenFrames = this.piskel.hiddenFrames.map(function (index) {
+      if (index === fromIndex) {
+        return toIndex;
+      }
+
+      // All the frames between fromIndex and toIndex changed their index.
+      var isImpacted = index >= Math.min(fromIndex, toIndex) &&
+                       index <= Math.max(fromIndex, toIndex);
+      if (isImpacted) {
+        if (fromIndex < toIndex) {
+          // If the frame moved to a higher index, all impacted frames had their index
+          // reduced by 1.
+          return index - 1;
+        } else {
+          // Otherwise, they had their index increased by 1.
+          return index + 1;
+        }
+      }
+    });
+  };
+
+  ns.PiskelController.prototype.hasVisibleFrameAt = function (index) {
+    return this.piskel.hiddenFrames.indexOf(index) === -1;
+  };
+
+  ns.PiskelController.prototype.getVisibleFrameIndexes = function () {
+    return this.getCurrentLayer().getFrames().map(function (frame, index) {
+      return index;
+    }).filter(function (index) {
+      return this.piskel.hiddenFrames.indexOf(index) === -1;
+    }.bind(this));
   };
 
   ns.PiskelController.prototype.getFrameCount = function () {
@@ -297,4 +368,12 @@
   ns.PiskelController.prototype.serialize = function () {
     return pskl.utils.serialization.Serializer.serialize(this.piskel);
   };
+
+  /**
+   * Check if the current sprite is empty. Emptiness here means no pixel has been filled
+   * on any layer or frame for the current sprite.
+   */
+  ns.PiskelController.prototype.isEmpty = function () {
+    return pskl.app.currentColorsService.getCurrentColors().length === 0;
+  };
 })();

src/js/controller/piskel/PublicPiskelController.js

@@ -37,6 +37,7 @@
     this.saveWrap_('moveLayerDown', true);
     this.saveWrap_('removeCurrentLayer', true);
     this.saveWrap_('setLayerOpacityAt', true);
+    this.saveWrap_('toggleFrameVisibilityAt', true);
 
     var shortcuts = pskl.service.keyboard.Shortcuts;
     pskl.app.shortcutService.registerShortcut(shortcuts.MISC.PREVIOUS_FRAME, this.selectPreviousFrame.bind(this));

src/js/controller/preview/PopupPreviewController.js

@@ -33,7 +33,7 @@
     pskl.utils.Event.addEventListener(this.popup, 'resize', this.onWindowResize_, this);
     pskl.utils.Event.addEventListener(this.popup, 'unload', this.onPopupClosed_, this);
     var container = this.popup.document.querySelector('.preview-container');
-    this.renderer = new pskl.rendering.frame.BackgroundImageFrameRenderer($(container));
+    this.renderer = new pskl.rendering.frame.BackgroundImageFrameRenderer(container);
     this.updateZoom_();
     this.renderFlag = true;
   };

src/js/controller/preview/PreviewActionsController.js

@@ -0,0 +1,232 @@
+(function () {
+  var ns = $.namespace('pskl.controller.preview');
+
+  ns.PreviewActionsController = function (previewController, container) {
+    this.previewController = previewController;
+    this.piskelController = previewController.piskelController;
+    this.container = container;
+
+    this.onionSkinShortcut = pskl.service.keyboard.Shortcuts.MISC.ONION_SKIN;
+    this.toggleGridShortcut = pskl.service.keyboard.Shortcuts.MISC.TOGGLE_GRID;
+
+    this.fpsRangeInput = document.querySelector('#preview-fps');
+    this.fpsCounterDisplay = document.querySelector('#display-fps');
+    this.openPopupPreview = document.querySelector('.open-popup-preview-button');
+    this.toggleGridButton = document.querySelector('.toggle-grid-button');
+    this.previewSizeDropdown = document.querySelector('.preview-drop-down');
+    this.previewSizes = {
+      original: {
+        button: document.querySelector('.original-size-button'),
+        shortcut: pskl.service.keyboard.Shortcuts.MISC.X1_PREVIEW,
+        tooltip: 'Original size preview'
+      },
+      best: {
+        button: document.querySelector('.best-size-button'),
+        shortcut: pskl.service.keyboard.Shortcuts.MISC.BEST_PREVIEW,
+        tooltip: 'Best size preview'
+      },
+      full: {
+        button: document.querySelector('.full-size-button'),
+        shortcut: pskl.service.keyboard.Shortcuts.MISC.FULL_PREVIEW,
+        tooltip: 'Full size preview'
+      }
+    };
+    this.toggleOnionSkinButton = document.querySelector('.preview-toggle-onion-skin');
+  };
+
+  ns.PreviewActionsController.prototype.init = function () {
+    this.fpsRangeInput.addEventListener('change', this.onFpsRangeInputUpdate_.bind(this));
+    this.fpsRangeInput.addEventListener('input', this.onFpsRangeInputUpdate_.bind(this));
+
+    var addEvent = pskl.utils.Event.addEventListener;
+    addEvent(this.toggleOnionSkinButton, 'click', this.toggleOnionSkin_, this);
+    addEvent(this.openPopupPreview, 'click', this.onOpenPopupPreviewClick_, this);
+    addEvent(this.toggleGridButton, 'click', this.toggleGrid_, this);
+
+    var registerShortcut = pskl.app.shortcutService.registerShortcut.bind(pskl.app.shortcutService);
+    registerShortcut(this.onionSkinShortcut, this.toggleOnionSkin_.bind(this));
+    registerShortcut(this.toggleGridShortcut, this.toggleGrid_.bind(this));
+
+    var onionSkinTooltip = pskl.utils.TooltipFormatter.format('Toggle onion skin', this.onionSkinShortcut);
+    this.toggleOnionSkinButton.setAttribute('title', onionSkinTooltip);
+
+    for (var size in this.previewSizes) {
+      if (this.previewSizes.hasOwnProperty(size)) {
+        var previewSize = this.previewSizes[size];
+        addEvent(previewSize.button, 'click', this.onChangePreviewSize_, this, size);
+        registerShortcut(previewSize.shortcut, this.onChangePreviewSize_.bind(this, size));
+        var tooltip = pskl.utils.TooltipFormatter.format(previewSize.tooltip, previewSize.shortcut);
+        previewSize.button.setAttribute('title', tooltip);
+      }
+    }
+
+    $.subscribe(Events.FRAME_SIZE_CHANGED, this.updatePreviewSizeButtons_.bind(this));
+    $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
+    $.subscribe(Events.FPS_CHANGED, this.updateFPS_.bind(this));
+    $.subscribe(Events.PISKEL_RESET, this.updateFPS_.bind(this));
+
+    this.updatePreviewSizeButtons_();
+    this.updateOnionSkinPreview_();
+    this.selectPreviewSizeButton_();
+    this.updateFPS_();
+    this.updateMaxFPS_();
+    this.updateToggleGridButton_();
+  };
+
+  ns.PreviewActionsController.prototype.updateToggleGridButton_ = function () {
+    var gridEnabled = pskl.UserSettings.get(pskl.UserSettings.GRID_ENABLED);
+    this.toggleGridButton.classList.toggle('icon-minimap-grid-white', !gridEnabled);
+    this.toggleGridButton.classList.toggle('icon-minimap-grid-gold', gridEnabled);
+    this.toggleGridButton.classList.toggle('preview-contextual-action-enabled', gridEnabled);
+  };
+
+  ns.PreviewActionsController.prototype.toggleGrid_ = function () {
+    var gridEnabled = pskl.UserSettings.get(pskl.UserSettings.GRID_ENABLED);
+    pskl.UserSettings.set(pskl.UserSettings.GRID_ENABLED, !gridEnabled);
+  };
+
+  ns.PreviewActionsController.prototype.updatePreviewSizeButtons_ = function () {
+    var fullZoom = this.previewController.getZoom();
+    var bestZoom = Math.floor(fullZoom);
+    var seamlessModeEnabled = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_MODE);
+
+    var validSizes;
+    if (fullZoom < 1) {
+      this.disablePreviewSizeWidget_('No other option available');
+      validSizes = ['full'];
+    } else if (fullZoom === 1) {
+      this.disablePreviewSizeWidget_('No other option available');
+      validSizes = ['original'];
+    } else if (seamlessModeEnabled) {
+      this.disablePreviewSizeWidget_('Disabled in tile mode');
+      validSizes = ['original'];
+    } else {
+      this.enablePreviewSizeWidget_();
+      if (fullZoom === bestZoom) {
+        // If the full zoom is the same as the best zoom, display the best option only as
+        // it gives the exact factor information.
+        validSizes = ['original', 'best'];
+      } else if (bestZoom === 1) {
+        // If best zoom is 1x, remove it as it is redundant with the original option.
+        validSizes = ['full', 'original'];
+      } else {
+        validSizes = ['full', 'original', 'best'];
+      }
+    }
+
+    // Update buttons content and status.
+    this.previewSizes.best.button.textContent = Math.floor(fullZoom) + 'x';
+    for (var size in this.previewSizes) {
+      if (this.previewSizes.hasOwnProperty(size)) {
+        var previewSize = this.previewSizes[size];
+        var isSizeEnabled = validSizes.indexOf(size) != -1;
+
+        // classList.toggle is not available on IE11.
+        if (isSizeEnabled) {
+          previewSize.button.classList.remove('preview-contextual-action-hidden');
+        } else {
+          previewSize.button.classList.add('preview-contextual-action-hidden');
+        }
+      }
+    }
+
+    // Update the selected preview size if the currently selected size is not valid.
+    var selectedSize = pskl.UserSettings.get(pskl.UserSettings.PREVIEW_SIZE);
+    if (validSizes.indexOf(selectedSize) === -1) {
+      this.onChangePreviewSize_(validSizes[0]);
+    }
+  };
+
+  ns.PreviewActionsController.prototype.enablePreviewSizeWidget_ = function () {
+    this.previewSizeDropdown.classList.remove('preview-drop-down-disabled');
+  };
+
+  ns.PreviewActionsController.prototype.disablePreviewSizeWidget_ = function (reason) {
+    // The .preview-disable-overlay is displayed on top of the preview size widget
+    document.querySelector('.preview-disable-overlay').setAttribute('data-original-title', reason);
+    this.previewSizeDropdown.classList.add('preview-drop-down-disabled');
+  };
+
+  ns.PreviewActionsController.prototype.onOpenPopupPreviewClick_ = function () {
+    this.previewController.openPopupPreview();
+  };
+
+  ns.PreviewActionsController.prototype.onChangePreviewSize_ = function (size) {
+    var previewSize = this.previewSizes[size];
+    var isEnabled = !previewSize.button.classList.contains('preview-contextual-action-hidden');
+    if (isEnabled) {
+      pskl.UserSettings.set(pskl.UserSettings.PREVIEW_SIZE, size);
+    }
+  };
+
+  ns.PreviewActionsController.prototype.onUserSettingsChange_ = function (evt, name, value) {
+    if (name == pskl.UserSettings.ONION_SKIN) {
+      this.updateOnionSkinPreview_();
+    } else if (name == pskl.UserSettings.MAX_FPS) {
+      this.updateMaxFPS_();
+    } else if (name === pskl.UserSettings.SEAMLESS_MODE) {
+      this.updatePreviewSizeButtons_();
+    } else if (name === pskl.UserSettings.GRID_ENABLED) {
+      this.updateToggleGridButton_();
+    } else {
+      this.selectPreviewSizeButton_();
+    }
+  };
+
+  ns.PreviewActionsController.prototype.updateOnionSkinPreview_ = function () {
+    var enabledClassname = 'preview-toggle-onion-skin-enabled';
+    var isEnabled = pskl.UserSettings.get(pskl.UserSettings.ONION_SKIN);
+
+    // classList.toggle is not available on IE11.
+    if (isEnabled) {
+      this.toggleOnionSkinButton.classList.add(enabledClassname);
+    } else {
+      this.toggleOnionSkinButton.classList.remove(enabledClassname);
+    }
+  };
+
+  ns.PreviewActionsController.prototype.selectPreviewSizeButton_ = function () {
+    var currentlySelected = document.querySelector('.size-button-selected');
+    if (currentlySelected) {
+      currentlySelected.classList.remove('size-button-selected');
+    }
+
+    var selectedSize = pskl.UserSettings.get(pskl.UserSettings.PREVIEW_SIZE);
+    var previewSize = this.previewSizes[selectedSize];
+    previewSize.button.classList.add('size-button-selected');
+  };
+
+  ns.PreviewActionsController.prototype.updateMaxFPS_ = function () {
+    var maxFps = pskl.UserSettings.get(pskl.UserSettings.MAX_FPS);
+    this.fpsRangeInput.setAttribute('max', maxFps);
+    this.piskelController.setFPS(Math.min(maxFps, this.piskelController.getFPS()));
+  };
+
+  /**
+   * Event handler triggered on 'input' or 'change' events.
+   */
+  ns.PreviewActionsController.prototype.onFpsRangeInputUpdate_ = function (evt) {
+    var fps = parseInt(this.fpsRangeInput.value, 10);
+    this.piskelController.setFPS(fps);
+    // blur only on 'change' events, as blurring on 'input' breaks on Firefox
+    if (evt.type === 'change') {
+      this.fpsRangeInput.blur();
+    }
+  };
+
+  ns.PreviewActionsController.prototype.updateFPS_ = function () {
+    var fps = this.piskelController.getFPS();
+    if (fps !== this.fpsRangeInput.value) {
+      // reset
+      this.fpsRangeInput.value = 0;
+      // set proper value
+      this.fpsRangeInput.value = fps;
+      this.fpsCounterDisplay.innerHTML = fps + ' FPS';
+    }
+  };
+
+  ns.PreviewActionsController.prototype.toggleOnionSkin_ = function () {
+    var currentValue = pskl.UserSettings.get(pskl.UserSettings.ONION_SKIN);
+    pskl.UserSettings.set(pskl.UserSettings.ONION_SKIN, !currentValue);
+  };
+})();

src/js/controller/preview/PreviewController.js

@@ -11,201 +11,43 @@
 
     this.elapsedTime = 0;
     this.currentIndex = 0;
-
-    this.onionSkinShortcut = pskl.service.keyboard.Shortcuts.MISC.ONION_SKIN;
-
     this.lastRenderTime = 0;
     this.renderFlag = true;
 
-    this.fpsRangeInput = document.querySelector('#preview-fps');
-    this.fpsCounterDisplay = document.querySelector('#display-fps');
-    this.openPopupPreview = document.querySelector('.open-popup-preview-button');
-    this.previewSizeDropdown = document.querySelector('.preview-drop-down');
-    this.previewSizes = {
-      original: {
-        button: document.querySelector('.original-size-button'),
-        shortcut: pskl.service.keyboard.Shortcuts.MISC.X1_PREVIEW,
-        tooltip: 'Original size preview'
-      },
-      best: {
-        button: document.querySelector('.best-size-button'),
-        shortcut: pskl.service.keyboard.Shortcuts.MISC.BEST_PREVIEW,
-        tooltip: 'Best size preview'
-      },
-      full: {
-        button: document.querySelector('.full-size-button'),
-        shortcut: pskl.service.keyboard.Shortcuts.MISC.FULL_PREVIEW,
-        tooltip: 'Full size preview'
-      }
-    };
-    this.toggleOnionSkinButton = document.querySelector('.preview-toggle-onion-skin');
-
     this.renderer = new pskl.rendering.frame.BackgroundImageFrameRenderer(this.container);
     this.popupPreviewController = new ns.PopupPreviewController(piskelController);
+    this.previewActionsController = new ns.PreviewActionsController(this, container);
   };
 
   ns.PreviewController.prototype.init = function () {
-    this.fpsRangeInput.addEventListener('change', this.onFpsRangeInputUpdate_.bind(this));
+    var width = Constants.ANIMATED_PREVIEW_WIDTH + Constants.RIGHT_COLUMN_PADDING_LEFT;
-    this.fpsRangeInput.addEventListener('input', this.onFpsRangeInputUpdate_.bind(this));
+    document.querySelector('.right-column').style.width = width + 'px';
-
-    document.querySelector('.right-column').style.width = Constants.ANIMATED_PREVIEW_WIDTH + 'px';
-
-    var addEvent = pskl.utils.Event.addEventListener;
-    addEvent(this.toggleOnionSkinButton, 'click', this.toggleOnionSkin_, this);
-    addEvent(this.openPopupPreview, 'click', this.onOpenPopupPreviewClick_, this);
-
-    var registerShortcut = pskl.app.shortcutService.registerShortcut.bind(pskl.app.shortcutService);
-    registerShortcut(this.onionSkinShortcut, this.toggleOnionSkin_.bind(this));
-
-    var onionSkinTooltip = pskl.utils.TooltipFormatter.format('Toggle onion skin', this.onionSkinShortcut);
-    this.toggleOnionSkinButton.setAttribute('title', onionSkinTooltip);
-
-    for (var size in this.previewSizes) {
-      if (this.previewSizes.hasOwnProperty(size)) {
-        var previewSize = this.previewSizes[size];
-        addEvent(previewSize.button, 'click', this.onChangePreviewSize_, this, size);
-        registerShortcut(previewSize.shortcut, this.onChangePreviewSize_.bind(this, size));
-        var tooltip = pskl.utils.TooltipFormatter.format(previewSize.tooltip, previewSize.shortcut);
-        previewSize.button.setAttribute('title', tooltip);
-      }
-    }
 
     $.subscribe(Events.FRAME_SIZE_CHANGED, this.onFrameSizeChange_.bind(this));
-    $.subscribe(Events.USER_SETTINGS_CHANGED, $.proxy(this.onUserSettingsChange_, this));
+    $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
     $.subscribe(Events.PISKEL_SAVE_STATE, this.setRenderFlag_.bind(this, true));
-    $.subscribe(Events.FPS_CHANGED, this.updateFPS_.bind(this));
-    // On PISKEL_RESET, set the render flag and update the FPS input
     $.subscribe(Events.PISKEL_RESET, this.setRenderFlag_.bind(this, true));
-    $.subscribe(Events.PISKEL_RESET, this.updateFPS_.bind(this));
 
-    this.updatePreviewSizeButtons_();
     this.popupPreviewController.init();
+    this.previewActionsController.init();
 
     this.updateZoom_();
-    this.updateOnionSkinPreview_();
-    this.selectPreviewSizeButton_();
-    this.updateFPS_();
-    this.updateMaxFPS_();
     this.updateContainerDimensions_();
   };
 
-  ns.PreviewController.prototype.updatePreviewSizeButtons_ = function () {
+  ns.PreviewController.prototype.openPopupPreview = function () {
-    var fullZoom = this.calculateZoom_();
-    var bestZoom = Math.floor(fullZoom);
-    var seamlessModeEnabled = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_MODE);
-
-    var validSizes;
-    if (fullZoom < 1) {
-      this.disablePreviewSizeWidget_('No other option available');
-      validSizes = ['full'];
-    } else if (fullZoom === 1) {
-      this.disablePreviewSizeWidget_('No other option available');
-      validSizes = ['original'];
-    } else if (seamlessModeEnabled) {
-      this.disablePreviewSizeWidget_('Disabled in tile mode');
-      validSizes = ['original'];
-    } else {
-      this.enablePreviewSizeWidget_();
-      if (fullZoom === bestZoom) {
-        // If the full zoom is the same as the best zoom, display the best option only as
-        // it gives the exact factor information.
-        validSizes = ['original', 'best'];
-      } else if (bestZoom === 1) {
-        // If best zoom is 1x, remove it as it is redundant with the original option.
-        validSizes = ['full', 'original'];
-      } else {
-        validSizes = ['full', 'original', 'best'];
-      }
-    }
-
-    // Update buttons content and status.
-    this.previewSizes.best.button.textContent = Math.floor(fullZoom) + 'x';
-    for (var size in this.previewSizes) {
-      if (this.previewSizes.hasOwnProperty(size)) {
-        var previewSize = this.previewSizes[size];
-        var isSizeEnabled = validSizes.indexOf(size) != -1;
-
-        // classList.toggle is not available on IE11.
-        if (isSizeEnabled) {
-          previewSize.button.classList.remove('preview-contextual-action-hidden');
-        } else {
-          previewSize.button.classList.add('preview-contextual-action-hidden');
-        }
-      }
-    }
-
-    // Update the selected preview size if the currently selected size is not valid.
-    var selectedSize = pskl.UserSettings.get(pskl.UserSettings.PREVIEW_SIZE);
-    if (validSizes.indexOf(selectedSize) === -1) {
-      this.onChangePreviewSize_(validSizes[0]);
-    }
-  };
-
-  ns.PreviewController.prototype.enablePreviewSizeWidget_ = function () {
-    this.previewSizeDropdown.classList.remove('preview-drop-down-disabled');
-  };
-
-  ns.PreviewController.prototype.disablePreviewSizeWidget_ = function (reason) {
-    // The .preview-disable-overlay is displayed on top of the preview size widget
-    document.querySelector('.preview-disable-overlay').setAttribute('data-original-title', reason);
-    this.previewSizeDropdown.classList.add('preview-drop-down-disabled');
-  };
-
-  ns.PreviewController.prototype.onOpenPopupPreviewClick_ = function () {
     this.popupPreviewController.open();
   };
 
-  ns.PreviewController.prototype.onChangePreviewSize_ = function (size) {
-    var previewSize = this.previewSizes[size];
-    var isEnabled = !previewSize.button.classList.contains('preview-contextual-action-hidden');
-    if (isEnabled) {
-      pskl.UserSettings.set(pskl.UserSettings.PREVIEW_SIZE, size);
-    }
-  };
-
   ns.PreviewController.prototype.onUserSettingsChange_ = function (evt, name, value) {
-    if (name == pskl.UserSettings.ONION_SKIN) {
+    if (name === pskl.UserSettings.SEAMLESS_MODE) {
-      this.updateOnionSkinPreview_();
-    } else if (name == pskl.UserSettings.MAX_FPS) {
-      this.updateMaxFPS_();
-    } else if (name === pskl.UserSettings.SEAMLESS_MODE) {
       this.onFrameSizeChange_();
     } else {
       this.updateZoom_();
-      this.selectPreviewSizeButton_();
       this.updateContainerDimensions_();
     }
   };
 
-  ns.PreviewController.prototype.updateOnionSkinPreview_ = function () {
-    var enabledClassname = 'preview-toggle-onion-skin-enabled';
-    var isEnabled = pskl.UserSettings.get(pskl.UserSettings.ONION_SKIN);
-
-    // classList.toggle is not available on IE11.
-    if (isEnabled) {
-      this.toggleOnionSkinButton.classList.add(enabledClassname);
-    } else {
-      this.toggleOnionSkinButton.classList.remove(enabledClassname);
-    }
-  };
-
-  ns.PreviewController.prototype.selectPreviewSizeButton_ = function () {
-    var currentlySelected = document.querySelector('.size-button-selected');
-    if (currentlySelected) {
-      currentlySelected.classList.remove('size-button-selected');
-    }
-
-    var selectedSize = pskl.UserSettings.get(pskl.UserSettings.PREVIEW_SIZE);
-    var previewSize = this.previewSizes[selectedSize];
-    previewSize.button.classList.add('size-button-selected');
-  };
-
-  ns.PreviewController.prototype.updateMaxFPS_ = function () {
-    var maxFps = pskl.UserSettings.get(pskl.UserSettings.MAX_FPS);
-    this.fpsRangeInput.setAttribute('max', maxFps);
-    this.piskelController.setFPS(Math.min(maxFps, this.piskelController.getFPS()));
-  };
-
   ns.PreviewController.prototype.updateZoom_ = function () {
     var previewSize = pskl.UserSettings.get(pskl.UserSettings.PREVIEW_SIZE);
 
@@ -227,9 +69,9 @@
   };
 
   ns.PreviewController.prototype.getCoordinates = function(x, y) {
-    var containerOffset = this.container.offset();
+    var containerRect = this.container.getBoundingClientRect();
-    x = x - containerOffset.left;
+    x = x - containerRect.left;
-    y = y - containerOffset.top;
+    y = y - containerRect.top;
     var zoom = this.getZoom();
     return {
       x : Math.floor(x / zoom),
@@ -237,30 +79,6 @@
     };
   };
 
-  /**
-   * Event handler triggered on 'input' or 'change' events.
-   */
-  ns.PreviewController.prototype.onFpsRangeInputUpdate_ = function (evt) {
-    var fps = parseInt(this.fpsRangeInput.value, 10);
-    this.piskelController.setFPS(fps);
-    // blur only on 'change' events, as blurring on 'input' breaks on Firefox
-    if (evt.type === 'change') {
-      this.fpsRangeInput.blur();
-    }
-  };
-
-  ns.PreviewController.prototype.updateFPS_ = function () {
-    var fps = this.piskelController.getFPS();
-    if (fps !== this.fps) {
-      this.fps = fps;
-      // reset
-      this.fpsRangeInput.value = 0;
-      // set proper value
-      this.fpsRangeInput.value = this.fps;
-      this.fpsCounterDisplay.innerHTML = this.fps + ' FPS';
-    }
-  };
-
   ns.PreviewController.prototype.render = function (delta) {
     this.elapsedTime += delta;
     var index = this.getNextIndex_(delta);
@@ -276,16 +94,19 @@
   };
 
   ns.PreviewController.prototype.getNextIndex_ = function (delta) {
-    if (this.fps === 0) {
+    var fps = this.piskelController.getFPS();
+    if (fps === 0) {
       return this.piskelController.getCurrentFrameIndex();
     } else {
-      var index = Math.floor(this.elapsedTime / (1000 / this.fps));
+      var index = Math.floor(this.elapsedTime / (1000 / fps));
-      if (!this.piskelController.hasFrameAt(index)) {
+      var frameIndexes = this.piskelController.getVisibleFrameIndexes();
+      if (frameIndexes.length <= index) {
         this.elapsedTime = 0;
-        index = 0;
+        index = (frameIndexes.length) ? frameIndexes[0] : this.piskelController.getCurrentFrameIndex();
-      }
         return index;
       }
+      return frameIndexes[index];
+    }
   };
 
   /**
@@ -302,7 +123,6 @@
   ns.PreviewController.prototype.onFrameSizeChange_ = function () {
     this.updateZoom_();
     this.updateContainerDimensions_();
-    this.updatePreviewSizeButtons_();
   };
 
   ns.PreviewController.prototype.updateContainerDimensions_ = function () {
@@ -322,7 +142,7 @@
       width = frame.getWidth() * zoom;
     }
 
-    var containerEl = this.container.get(0);
+    var containerEl = this.container;
     containerEl.style.height = height + 'px';
     containerEl.style.width = width + 'px';
 
@@ -343,9 +163,4 @@
     return (this.renderFlag || this.popupPreviewController.renderFlag) &&
             (Date.now() - this.lastRenderTime > RENDER_MINIMUM_DELAY);
   };
-
-  ns.PreviewController.prototype.toggleOnionSkin_ = function () {
-    var currentValue = pskl.UserSettings.get(pskl.UserSettings.ONION_SKIN);
-    pskl.UserSettings.set(pskl.UserSettings.ONION_SKIN, !currentValue);
-  };
 })();

src/js/controller/settings/ImportController.js

@@ -14,6 +14,7 @@
     this.hiddenOpenPiskelInput = document.querySelector('[name="open-piskel-input"]');
 
     this.addEventListener('.browse-local-button', 'click', this.onBrowseLocalClick_);
+    this.addEventListener('.browse-backups-button', 'click', this.onBrowseBackupsClick_);
     this.addEventListener('.file-input-button', 'click', this.onFileInputClick_);
 
     // different handlers, depending on the Environment
@@ -23,24 +24,6 @@
       this.addEventListener(this.hiddenOpenPiskelInput, 'change', this.onOpenPiskelChange_);
       this.addEventListener('.open-piskel-button', 'click', this.onOpenPiskelClick_);
     }
-
-    this.initRestoreSession_();
-  };
-
-  ns.ImportController.prototype.initRestoreSession_ = function () {
-    var previousSessionContainer = document.querySelector('.previous-session');
-    var previousInfo = pskl.app.backupService.getPreviousPiskelInfo();
-    if (previousInfo) {
-      var previousSessionTemplate_ = pskl.utils.Template.get('previous-session-info-template');
-      var date = pskl.utils.DateUtils.format(previousInfo.date, '{{H}}:{{m}} - {{Y}}/{{M}}/{{D}}');
-      previousSessionContainer.innerHTML = pskl.utils.Template.replace(previousSessionTemplate_, {
-        name : previousInfo.name,
-        date : date
-      });
-      this.addEventListener('.restore-session-button', 'click', this.onRestorePreviousSessionClick_);
-    } else {
-      previousSessionContainer.innerHTML = 'No piskel backup was found on this browser.';
-    }
   };
 
   ns.ImportController.prototype.closeDrawer_ = function () {
@@ -77,6 +60,13 @@
     this.closeDrawer_();
   };
 
+  ns.ImportController.prototype.onBrowseBackupsClick_ = function (evt) {
+    $.publish(Events.DIALOG_SHOW, {
+      dialogId : 'browse-backups'
+    });
+    this.closeDrawer_();
+  };
+
   ns.ImportController.prototype.openPiskelFile_ = function (file) {
     if (this.isPiskel_(file)) {
       $.publish(Events.DIALOG_SHOW, {

src/js/controller/settings/SaveController.js

@@ -34,7 +34,7 @@
     this.saveDesktopAsNewButton = document.querySelector('#save-desktop-as-new-button');
     this.saveFileDownloadButton = document.querySelector('#save-file-download-button');
 
-    this.safeAddEventListener_(this.saveLocalStorageButton, 'click', this.saveToLocalStorage_);
+    this.safeAddEventListener_(this.saveLocalStorageButton, 'click', this.saveToIndexedDb_);
     this.safeAddEventListener_(this.saveGalleryButton, 'click', this.saveToGallery_);
     this.safeAddEventListener_(this.saveDesktopButton, 'click', this.saveToDesktop_);
     this.safeAddEventListener_(this.saveDesktopAsNewButton, 'click', this.saveToDesktopAsNew_);
@@ -99,7 +99,7 @@
     if (pskl.app.isLoggedIn()) {
       this.saveToGallery_();
     } else {
-      this.saveToLocalStorage_();
+      this.saveToIndexedDb_();
     }
   };
 
@@ -111,8 +111,8 @@
     this.saveTo_('saveToGallery', false);
   };
 
-  ns.SaveController.prototype.saveToLocalStorage_ = function () {
+  ns.SaveController.prototype.saveToIndexedDb_ = function () {
-    this.saveTo_('saveToLocalStorage', false);
+    this.saveTo_('saveToIndexedDb', false);
   };
 
   ns.SaveController.prototype.saveToDesktop_ = function () {

src/js/controller/settings/exportimage/GifExportController.js

@@ -14,14 +14,22 @@
   pskl.utils.inherit(ns.GifExportController, pskl.controller.settings.AbstractSettingController);
 
   ns.GifExportController.prototype.init = function () {
-
     this.uploadStatusContainerEl = document.querySelector('.gif-upload-status');
     this.previewContainerEl = document.querySelector('.gif-export-preview');
     this.uploadButton = document.querySelector('.gif-upload-button');
     this.downloadButton = document.querySelector('.gif-download-button');
+    this.repeatCheckbox = document.querySelector('.gif-repeat-checkbox');
+
+    // Initialize repeatCheckbox state
+    this.repeatCheckbox.checked = this.getRepeatSetting_();
 
     this.addEventListener(this.uploadButton, 'click', this.onUploadButtonClick_);
     this.addEventListener(this.downloadButton, 'click', this.onDownloadButtonClick_);
+    this.addEventListener(this.repeatCheckbox, 'change', this.onRepeatCheckboxChange_);
+
+    var currentColors = pskl.app.currentColorsService.getCurrentColors();
+    var tooManyColors = currentColors.length >= MAX_GIF_COLORS;
+    document.querySelector('.gif-export-warning').classList.toggle('visible', tooManyColors);
   };
 
   ns.GifExportController.prototype.getZoom_ = function () {
@@ -105,6 +113,7 @@
       width: width * zoom,
       height: height * zoom,
       preserveColors : preserveColors,
+      repeat: this.getRepeatSetting_() ? 0 : -1,
       transparent : transparent
     });
 
@@ -149,6 +158,15 @@
     return transparentColor;
   };
 
+  ns.GifExportController.prototype.onRepeatCheckboxChange_ = function () {
+    var checked = this.repeatCheckbox.checked;
+    pskl.UserSettings.set(pskl.UserSettings.EXPORT_GIF_REPEAT, checked);
+  };
+
+  ns.GifExportController.prototype.getRepeatSetting_ = function () {
+    return pskl.UserSettings.get(pskl.UserSettings.EXPORT_GIF_REPEAT);
+  };
+
   ns.GifExportController.prototype.updateStatus_ = function (imageUrl, error) {
     if (imageUrl) {
       var linkTpl = '<a class="highlight" href="{{link}}" target="_blank">{{shortLink}}</a>';

src/js/controller/settings/exportimage/MiscExportController.js

@@ -12,9 +12,6 @@
   ns.MiscExportController.prototype.init = function () {
     var cDownloadButton = document.querySelector('.c-download-button');
     this.addEventListener(cDownloadButton, 'click', this.onDownloadCFileClick_);
-
-    var selectedFrameDownloadButton = document.querySelector('.selected-frame-download-button');
-    this.addEventListener(selectedFrameDownloadButton, 'click', this.onDownloadSelectedFrameClick_);
   };
 
   ns.MiscExportController.prototype.onDownloadCFileClick_ = function (evt) {
@@ -76,14 +73,4 @@
     hexStr += ('00' + r.toString(16)).substr(-2);
     return hexStr;
   };
-
-  ns.MiscExportController.prototype.onDownloadSelectedFrameClick_ = function (evt) {
-    var frameIndex = this.piskelController.getCurrentFrameIndex();
-    var fileName = this.getPiskelName_() + '-' + (frameIndex + 1) + '.png';
-    var canvas = this.piskelController.renderFrameAt(frameIndex, true);
-
-    pskl.utils.BlobUtils.canvasToBlob(canvas, function(blob) {
-      pskl.utils.FileUtils.downloadAsFile(blob, fileName);
-    });
-  };
 })();

src/js/controller/settings/exportimage/PngExportController.js

@@ -31,6 +31,9 @@
     var downloadButton = document.querySelector('.png-download-button');
     var downloadPixiButton = document.querySelector('.png-pixi-download-button');
     var dataUriButton = document.querySelector('.datauri-open-button');
+    var selectedFrameDownloadButton = document.querySelector('.selected-frame-download-button');
+
+    this.pixiInlineImageCheckbox = document.querySelector('.png-pixi-inline-image-checkbox');
 
     this.initLayoutSection_();
     this.updateDimensionLabel_();
@@ -39,6 +42,7 @@
     this.addEventListener(downloadButton, 'click', this.onDownloadClick_);
     this.addEventListener(downloadPixiButton, 'click', this.onPixiDownloadClick_);
     this.addEventListener(dataUriButton, 'click', this.onDataUriClick_);
+    this.addEventListener(selectedFrameDownloadButton, 'click', this.onDownloadSelectedFrameClick_);
     $.subscribe(Events.EXPORT_SCALE_CHANGED, this.onScaleChanged_);
   };
 
@@ -149,9 +153,9 @@
   };
 
   // Used and overridden in casper integration tests.
-  ns.PngExportController.prototype.downloadCanvas_ = function (canvas) {
+  ns.PngExportController.prototype.downloadCanvas_ = function (canvas, name) {
     // Generate file name
-    var name = this.piskelController.getPiskel().getDescriptor().name;
+    name = name || this.piskelController.getPiskel().getDescriptor().name;
     var fileName = name + '.png';
 
     // Transform to blob and start download.
@@ -167,7 +171,15 @@
     var canvas = this.createPngSpritesheet_();
     var name = this.piskelController.getPiskel().getDescriptor().name;
 
-    zip.file(name + '.png', pskl.utils.CanvasUtils.getBase64FromCanvas(canvas) + '\n', {base64: true});
+    var image;
+
+    if (this.pixiInlineImageCheckbox.checked) {
+      image = canvas.toDataURL('image/png');
+    } else {
+      image = name + '.png';
+
+      zip.file(image, pskl.utils.CanvasUtils.getBase64FromCanvas(canvas) + '\n', {base64: true});
+    }
 
     var width = canvas.width / this.getColumns_();
     var height = canvas.height / this.getRows_();
@@ -192,7 +204,7 @@
       'meta': {
         'app': 'https://github.com/piskelapp/piskel/',
         'version': '1.0',
-        'image': name + '.png',
+        'image': image,
         'format': 'RGBA8888',
         'size': {'w': canvas.width,'h': canvas.height}
       }
@@ -207,6 +219,27 @@
   };
 
   ns.PngExportController.prototype.onDataUriClick_ = function (evt) {
-    window.open(this.createPngSpritesheet_().toDataURL('image/png'));
+    var popup = window.open('about:blank');
+    var dataUri = this.createPngSpritesheet_().toDataURL('image/png');
+    window.setTimeout(function () {
+      var html = pskl.utils.Template.getAndReplace('data-uri-export-partial', {
+        src: dataUri
+      });
+      popup.document.title = dataUri;
+      popup.document.body.innerHTML = html;
+    }.bind(this), 500);
+  };
+
+  ns.PngExportController.prototype.onDownloadSelectedFrameClick_ = function (evt) {
+    var frameIndex = this.piskelController.getCurrentFrameIndex();
+    var name = this.piskelController.getPiskel().getDescriptor().name;
+    var canvas = this.piskelController.renderFrameAt(frameIndex, true);
+    var zoom = this.exportController.getExportZoom();
+    if (zoom != 1) {
+      canvas = pskl.utils.ImageResizer.resize(canvas, canvas.width * zoom, canvas.height * zoom, false);
+    }
+
+    var fileName = name + '-' + (frameIndex + 1) + '.png';
+    this.downloadCanvas_(canvas, fileName);
   };
 })();

src/js/controller/settings/exportimage/ZipExportController.js

@@ -13,11 +13,24 @@
     this.pngFilePrefixInput.value = 'sprite_';
 
     this.splitByLayersCheckbox = document.querySelector('.zip-split-layers-checkbox');
+    this.addEventListener(this.splitByLayersCheckbox, 'change', this.onSplitLayersClick_);
+
+    this.useLayerNamesContainer = document.querySelector('.use-layer-names-container');
+    this.useLayerNamesCheckbox = document.querySelector('.zip-use-layer-names-checkbox');
+    this.toggleHideUseLayerNamesCheckbox();
 
     var zipButton = document.querySelector('.zip-generate-button');
     this.addEventListener(zipButton, 'click', this.onZipButtonClick_);
   };
 
+  ns.ZipExportController.prototype.toggleHideUseLayerNamesCheckbox = function () {
+    this.useLayerNamesContainer.style.display = (this.splitByLayersCheckbox.checked ? 'block' : 'none');
+  };
+
+  ns.ZipExportController.prototype.onSplitLayersClick_ = function () {
+    this.toggleHideUseLayerNamesCheckbox();
+  };
+
   ns.ZipExportController.prototype.onZipButtonClick_ = function () {
     var zip = new window.JSZip();
 
@@ -63,6 +76,9 @@
         var basename = this.pngFilePrefixInput.value;
         var frameid = pskl.utils.StringUtils.leftPad(i + 1, framePaddingLength, '0');
         var filename = 'l' + layerid + '_' + basename + frameid + '.png';
+        if (this.useLayerNamesCheckbox.checked) {
+          filename = layer.getName() + '_' + basename + frameid + '.png';
+        }
         zip.file(filename, pskl.utils.CanvasUtils.getBase64FromCanvas(canvas) + '\n', {base64: true});
       }
     }

src/js/controller/settings/preferences/GridPreferencesController.js

@@ -22,6 +22,7 @@
     this.piskelController = piskelController;
     this.preferencesController = preferencesController;
     this.sizePicker = new pskl.widgets.SizePicker(this.onSizePickerChanged_.bind(this));
+    this.spacingPicker = new pskl.widgets.SizePicker(this.onSpacingPickerChanged_.bind(this));
   };
 
   pskl.utils.inherit(ns.GridPreferencesController, pskl.controller.settings.AbstractSettingController);
@@ -40,6 +41,11 @@
     this.sizePicker.init(document.querySelector('.grid-size-container'));
     this.sizePicker.setSize(gridWidth);
 
+    //Grid Spacing
+    var gridSpacing = pskl.UserSettings.get(pskl.UserSettings.GRID_SPACING);
+    this.spacingPicker.init(document.querySelector('.grid-spacing-container'));
+    this.spacingPicker.setSize(gridSpacing);
+
     // Grid color
     var colorListItemTemplate = pskl.utils.Template.get('color-list-item-template');
 
@@ -68,6 +74,7 @@
 
   ns.GridPreferencesController.prototype.destroy = function () {
     this.sizePicker.destroy();
+    this.spacingPicker.destroy();
     this.superclass.destroy.call(this);
   };
 
@@ -75,6 +82,10 @@
     pskl.UserSettings.set(pskl.UserSettings.GRID_WIDTH, size);
   };
 
+  ns.GridPreferencesController.prototype.onSpacingPickerChanged_ = function (size) {
+    pskl.UserSettings.set(pskl.UserSettings.GRID_SPACING, size);
+  };
+
   ns.GridPreferencesController.prototype.onEnableGridChange_ = function (evt) {
     pskl.UserSettings.set(pskl.UserSettings.GRID_ENABLED, evt.currentTarget.checked);
   };

src/js/database/BackupDatabase.js

@@ -0,0 +1,258 @@
+(function () {
+  var ns = $.namespace('pskl.database');
+
+  var DB_NAME = 'PiskelSessionsDatabase';
+  var DB_VERSION = 1;
+
+  // Simple wrapper to promisify a request.
+  var _requestPromise = function (req) {
+    var deferred = Q.defer();
+    req.onsuccess = deferred.resolve.bind(deferred);
+    req.onerror = deferred.reject.bind(deferred);
+    return deferred.promise;
+  };
+
+  /**
+   * The BackupDatabase handles all the database interactions related
+   * to piskel snapshots continuously saved while during the usage of
+   * Piskel.
+   */
+  ns.BackupDatabase = function () {
+    this.db = null;
+  };
+
+  ns.BackupDatabase.DB_NAME = DB_NAME;
+
+  /**
+   * Open and initialize the database.
+   * Returns a promise that resolves when the database is opened.
+   */
+  ns.BackupDatabase.prototype.init = function () {
+    var request = window.indexedDB.open(DB_NAME, DB_VERSION);
+    request.onupgradeneeded = this.onUpgradeNeeded_.bind(this);
+
+    return _requestPromise(request).then(function (event) {
+      this.db = event.target.result;
+      return this.db;
+    }.bind(this)).catch(function (e) {
+      console.log('Could not initialize the piskel backup database');
+    });
+  };
+
+  ns.BackupDatabase.prototype.onUpgradeNeeded_ = function (event) {
+    // Set this.db early to allow migration scripts to access it in oncomplete.
+    this.db = event.target.result;
+
+    // Create an object store "piskels" with the autoIncrement flag set as true.
+    var objectStore = this.db.createObjectStore('snapshots', { keyPath: 'id', autoIncrement : true });
+
+    objectStore.createIndex('session_id', 'session_id', { unique: false });
+    objectStore.createIndex('date', 'date', { unique: false });
+    objectStore.createIndex('session_id, date', ['session_id', 'date'], { unique: false });
+
+    objectStore.transaction.oncomplete = function(event) {
+      // Nothing to do at the moment!
+    }.bind(this);
+  };
+
+  ns.BackupDatabase.prototype.openObjectStore_ = function () {
+    return this.db.transaction(['snapshots'], 'readwrite').objectStore('snapshots');
+  };
+
+  /**
+   * Send an add request for the provided snapshot.
+   * Returns a promise that resolves the request event.
+   */
+  ns.BackupDatabase.prototype.createSnapshot = function (snapshot) {
+    var objectStore = this.openObjectStore_();
+    var request = objectStore.add(snapshot);
+    return _requestPromise(request);
+  };
+
+  /**
+   * Send a put request for the provided snapshot.
+   * Returns a promise that resolves the request event.
+   */
+  ns.BackupDatabase.prototype.updateSnapshot = function (snapshot) {
+    var objectStore = this.openObjectStore_();
+    var request = objectStore.put(snapshot);
+    return _requestPromise(request);
+  };
+
+  /**
+   * Send a delete request for the provided snapshot.
+   * Returns a promise that resolves the request event.
+   */
+  ns.BackupDatabase.prototype.deleteSnapshot = function (snapshot) {
+    var objectStore = this.openObjectStore_();
+    var request = objectStore.delete(snapshot.id);
+    return _requestPromise(request);
+  };
+
+  /**
+   * Send a get request for the provided snapshotId.
+   * Returns a promise that resolves the request event.
+   */
+  ns.BackupDatabase.prototype.getSnapshot = function (snapshotId) {
+    var objectStore = this.openObjectStore_();
+    var request = objectStore.get(snapshotId);
+    return _requestPromise(request).then(function (event) {
+      return event.target.result;
+    });
+  };
+
+  /**
+   * Get the last (most recent) snapshot that satisfies the accept filter provided.
+   * Returns a promise that will resolve with the first matching snapshot (or null
+   * if no valid snapshot is found).
+   *
+   * @param {Function} accept:
+   *        Filter method that takes a snapshot as argument and should return true
+   *        if the snapshot is valid.
+   */
+  ns.BackupDatabase.prototype.findLastSnapshot = function (accept) {
+    // Create the backup promise.
+    var deferred = Q.defer();
+
+    // Open a transaction to the snapshots object store.
+    var objectStore = this.db.transaction(['snapshots']).objectStore('snapshots');
+
+    var index = objectStore.index('date');
+    var range = IDBKeyRange.upperBound(Infinity);
+    index.openCursor(range, 'prev').onsuccess = function(event) {
+      var cursor = event.target.result;
+      var snapshot = cursor && cursor.value;
+
+      // Resolve null if we couldn't find a matching snapshot.
+      if (!snapshot) {
+        deferred.resolve(null);
+      } else if (accept(snapshot)) {
+        deferred.resolve(snapshot);
+      } else {
+        cursor.continue();
+      }
+    };
+
+    return deferred.promise;
+  };
+
+  /**
+   * Retrieve all the snapshots for a given session id, sorted by descending date order.
+   * Returns a promise that resolves with an array of snapshots.
+   *
+   * @param {String} sessionId
+   *        The session id
+   */
+  ns.BackupDatabase.prototype.getSnapshotsBySessionId = function (sessionId) {
+    // Create the backup promise.
+    var deferred = Q.defer();
+
+    // Open a transaction to the snapshots object store.
+    var objectStore = this.db.transaction(['snapshots']).objectStore('snapshots');
+
+    // Loop on all the saved snapshots for the provided piskel id
+    var index = objectStore.index('session_id, date');
+    var keyRange = IDBKeyRange.bound(
+      [sessionId, 0],
+      [sessionId, Infinity]
+    );
+
+    var snapshots = [];
+    // Ordered by date in descending order.
+    index.openCursor(keyRange, 'prev').onsuccess = function(event) {
+      var cursor = event.target.result;
+      if (cursor) {
+        snapshots.push(cursor.value);
+        cursor.continue();
+      } else {
+        // Consumed all piskel snapshots
+        deferred.resolve(snapshots);
+      }
+    };
+
+    return deferred.promise;
+  };
+
+  ns.BackupDatabase.prototype.getSessions = function () {
+    // Create the backup promise.
+    var deferred = Q.defer();
+
+    // Open a transaction to the snapshots object store.
+    var objectStore = this.db.transaction(['snapshots']).objectStore('snapshots');
+
+    var sessions = {};
+
+    var _createSession = function (snapshot) {
+      sessions[snapshot.session_id] = {
+        startDate: snapshot.date,
+        endDate: snapshot.date,
+        name: snapshot.name,
+        description: snapshot.description,
+        id: snapshot.session_id,
+        count: 1
+      };
+    };
+
+    var _updateSession = function (snapshot) {
+      var s = sessions[snapshot.session_id];
+      s.startDate = Math.min(s.startDate, snapshot.date);
+      s.endDate = Math.max(s.endDate, snapshot.date);
+      s.count++;
+
+      if (s.endDate === snapshot.date) {
+        // If the endDate was updated, update also the session metadata to
+        // reflect the latest state.
+        s.name = snapshot.name;
+        s.description = snapshot.description;
+      }
+    };
+
+    var index = objectStore.index('date');
+    var range = IDBKeyRange.upperBound(Infinity);
+    index.openCursor(range, 'prev').onsuccess = function(event) {
+      var cursor = event.target.result;
+      var snapshot = cursor && cursor.value;
+      if (!snapshot) {
+        deferred.resolve(sessions);
+      } else {
+        if (sessions[snapshot.session_id]) {
+          _updateSession(snapshot);
+        } else {
+          _createSession(snapshot);
+        }
+        cursor.continue();
+      }
+    };
+
+    return deferred.promise.then(function (sessions) {
+      // Convert the sessions map to an array.
+      return Object.keys(sessions).map(function (key) {
+        return sessions[key];
+      });
+    });
+  };
+
+  ns.BackupDatabase.prototype.deleteSnapshotsForSession = function (sessionId) {
+    // Create the backup promise.
+    var deferred = Q.defer();
+
+    // Open a transaction to the snapshots object store.
+    var objectStore = this.openObjectStore_();
+
+    // Loop on all the saved snapshots for the provided piskel id
+    var index = objectStore.index('session_id');
+    var keyRange = IDBKeyRange.only(sessionId);
+
+    index.openCursor(keyRange).onsuccess = function(event) {
+      var cursor = event.target.result;
+      if (cursor) {
+        cursor.delete();
+        cursor.continue();
+      } else {
+        deferred.resolve();
+      }
+    };
+
+    return deferred.promise;
+  };
+})();

src/js/database/PiskelDatabase.js

@@ -0,0 +1,139 @@
+(function () {
+  var ns = $.namespace('pskl.database');
+
+  var DB_NAME = 'PiskelDatabase';
+  var DB_VERSION = 1;
+
+  // Simple wrapper to promisify a request.
+  var _requestPromise = function (req) {
+    var deferred = Q.defer();
+    req.onsuccess = deferred.resolve.bind(deferred);
+    req.onerror = deferred.reject.bind(deferred);
+    return deferred.promise;
+  };
+
+  /**
+   * The PiskelDatabase handles all the database interactions related
+   * to the local piskel saved that can be performed in-browser.
+   */
+  ns.PiskelDatabase = function (options) {
+    this.db = null;
+  };
+
+  ns.PiskelDatabase.DB_NAME = DB_NAME;
+
+  ns.PiskelDatabase.prototype.init = function () {
+    var request = window.indexedDB.open(DB_NAME, DB_VERSION);
+    request.onupgradeneeded = this.onUpgradeNeeded_.bind(this);
+
+    return _requestPromise(request).then(function (event) {
+      this.db = event.target.result;
+      return this.db;
+    }.bind(this));
+  };
+
+  ns.PiskelDatabase.prototype.onUpgradeNeeded_ = function (event) {
+    // Set this.db early to allow migration scripts to access it in oncomplete.
+    this.db = event.target.result;
+
+    // Create an object store "piskels" with the autoIncrement flag set as true.
+    var objectStore = this.db.createObjectStore('piskels', { keyPath : 'name' });
+    objectStore.transaction.oncomplete = function(event) {
+      pskl.database.migrate.MigrateLocalStorageToIndexedDb.migrate(this);
+    }.bind(this);
+  };
+
+  ns.PiskelDatabase.prototype.openObjectStore_ = function () {
+    return this.db.transaction(['piskels'], 'readwrite').objectStore('piskels');
+  };
+
+  /**
+   * Send a get request for the provided name.
+   * Returns a promise that resolves the request event.
+   */
+  ns.PiskelDatabase.prototype.get = function (name) {
+    var objectStore = this.openObjectStore_();
+    return _requestPromise(objectStore.get(name)).then(function (event) {
+      return event.target.result;
+    });
+  };
+
+  /**
+   * List all locally saved piskels.
+   * Returns a promise that resolves an array of objects:
+   * - name: name of the piskel
+   * - description: description of the piskel
+   * - date: save date
+   *
+   * The sprite content is not contained in the object and
+   * needs to be retrieved with a separate get.
+   */
+  ns.PiskelDatabase.prototype.list = function () {
+    var deferred = Q.defer();
+
+    var piskels = [];
+    var objectStore = this.openObjectStore_();
+    var cursor = objectStore.openCursor();
+    cursor.onsuccess = function(event) {
+      var cursor = event.target.result;
+      if (cursor) {
+        piskels.push({
+          name: cursor.value.name,
+          date: cursor.value.date,
+          description: cursor.value.description
+        });
+        cursor.continue();
+      } else {
+        // Cursor consumed all availabled piskels
+        deferred.resolve(piskels);
+      }
+    };
+
+    cursor.onerror = function () {
+      deferred.reject();
+    };
+
+    return deferred.promise;
+  };
+
+  /**
+   * Send an put request for the provided args.
+   * Returns a promise that resolves the request event.
+   */
+  ns.PiskelDatabase.prototype.update = function (name, description, date, serialized) {
+    var data = {};
+
+    data.name = name;
+    data.serialized = serialized;
+    data.date = date;
+    data.description = description;
+
+    var objectStore = this.openObjectStore_();
+    return _requestPromise(objectStore.put(data));
+  };
+
+  /**
+   * Send an add request for the provided args.
+   * Returns a promise that resolves the request event.
+   */
+  ns.PiskelDatabase.prototype.create = function (name, description, date, serialized) {
+    var data = {};
+
+    data.name = name;
+    data.serialized = serialized;
+    data.date = date;
+    data.description = description;
+
+    var objectStore = this.openObjectStore_();
+    return _requestPromise(objectStore.add(data));
+  };
+
+  /**
+   * Delete a saved piskel for the provided name.
+   * Returns a promise that resolves the request event.
+   */
+  ns.PiskelDatabase.prototype.delete = function (name) {
+    var objectStore = this.openObjectStore_();
+    return _requestPromise(objectStore.delete(name));
+  };
+})();

src/js/database/migrate/MigrateLocalStorageToIndexedDb.js

@@ -0,0 +1,76 @@
+(function () {
+  var ns = $.namespace('pskl.database.migrate');
+
+  // Simple migration helper to move local storage saves to indexed db.
+  ns.MigrateLocalStorageToIndexedDb = {};
+
+  ns.MigrateLocalStorageToIndexedDb.migrate = function (piskelDatabase) {
+    var deferred = Q.defer();
+
+    var localStorageService = pskl.app.localStorageService;
+
+    var localStorageKeys = localStorageService.getKeys();
+    var migrationData = localStorageKeys.map(function (key) {
+      return {
+        name: key.name,
+        description: key.description,
+        date: key.date,
+        serialized: localStorageService.getPiskel(key.name)
+      };
+    });
+
+    // Define the sequential migration process.
+    // Wait for each sprite to be saved before saving the next one.
+    var success = true;
+    var migrateSprite = function (index) {
+      var data = migrationData[index];
+      if (!data) {
+        console.log('Data migration from local storage to indexed db finished.');
+        if (success) {
+          console.log('Local storage piskels successfully migrated. Old copies will be deleted.');
+          ns.MigrateLocalStorageToIndexedDb.deleteLocalStoragePiskels();
+        }
+
+        deferred.resolve();
+      } else {
+        ns.MigrateLocalStorageToIndexedDb.save_(piskelDatabase, data)
+          .then(function () {
+            migrateSprite(index + 1);
+          })
+          .catch(function (e) {
+            var success = false;
+            console.error('Failed to migrate local storage sprite for name: ' + data.name);
+            migrateSprite(index + 1);
+          });
+      }
+    };
+
+    // Start the migration.
+    migrateSprite(0);
+
+    return deferred.promise;
+  };
+
+  ns.MigrateLocalStorageToIndexedDb.save_ = function (piskelDatabase, piskelData) {
+    return piskelDatabase.get(piskelData.name).then(function (data) {
+      if (typeof data !== 'undefined') {
+        return piskelDatabase.update(piskelData.name, piskelData.description, piskelData.date, piskelData.serialized);
+      } else {
+        return piskelDatabase.create(piskelData.name, piskelData.description, piskelData.date, piskelData.serialized);
+      }
+    });
+  };
+
+  ns.MigrateLocalStorageToIndexedDb.deleteLocalStoragePiskels = function () {
+    var localStorageKeys = pskl.app.localStorageService.getKeys();
+
+    // Remove all sprites.
+    localStorageKeys.forEach(function (key) {
+      window.localStorage.removeItem('piskel.' + key.name);
+    });
+
+    // Remove keys.
+    window.localStorage.removeItem('piskel.keys');
+  };
+
+})();

src/js/devtools/DrawingTestPlayer.js

@@ -32,6 +32,7 @@
   };
 
   ns.DrawingTestPlayer.prototype.setupInitialState_ = function () {
+
     var size = this.initialState.size;
     var piskel = this.createPiskel_(size.width, size.height);
     pskl.app.piskelController.setPiskel(piskel);
@@ -39,9 +40,10 @@
     $.publish(Events.SELECT_PRIMARY_COLOR, [this.initialState.primaryColor]);
     $.publish(Events.SELECT_SECONDARY_COLOR, [this.initialState.secondaryColor]);
     $.publish(Events.SELECT_TOOL, [this.initialState.selectedTool]);
-    if (this.initialState.penSize) {
+
+    // Old tests do not have penSize stored in initialState, fallback to 1.
+    var penSize = this.initialState.penSize || 1;
     pskl.app.penSizeService.setPenSize(this.initialState.penSize);
-    }
   };
 
   ns.DrawingTestPlayer.prototype.createPiskel_ = function (width, height) {
@@ -108,6 +110,8 @@
         this.playTransformToolEvent_(recordEvent);
       } else if (recordEvent.type === 'instrumented-event') {
         this.playInstrumentedEvent_(recordEvent);
+      } else if (recordEvent.type === 'clipboard-event') {
+        this.playClipboardEvent_(recordEvent);
       }
 
       // Record the time spent replaying the event
@@ -169,6 +173,16 @@
     pskl.app.piskelController[recordEvent.methodName].apply(pskl.app.piskelController, recordEvent.args);
   };
 
+  ns.DrawingTestPlayer.prototype.playClipboardEvent_ = function (recordEvent) {
+    $.publish(recordEvent.event.type, {
+      preventDefault: function () {},
+      clipboardData: {
+        items: [],
+        setData: function () {}
+      }
+    });
+  };
+
   ns.DrawingTestPlayer.prototype.onTestEnd_ = function () {
     this.removeMouseShim_();
     // Restore the original drawing loop.

src/js/devtools/DrawingTestRecorder.js

@@ -15,6 +15,10 @@
     $.subscribe(Events.TRANSFORMATION_EVENT, this.onTransformationEvent_.bind(this));
     $.subscribe(Events.PRIMARY_COLOR_SELECTED, this.onColorEvent_.bind(this, true));
     $.subscribe(Events.SECONDARY_COLOR_SELECTED, this.onColorEvent_.bind(this, false));
+    $.subscribe(Events.CLIPBOARD_COPY, this.onClipboardEvent_.bind(this));
+    $.subscribe(Events.CLIPBOARD_CUT, this.onClipboardEvent_.bind(this));
+    $.subscribe(Events.CLIPBOARD_PASTE, this.onClipboardEvent_.bind(this));
+
 
     for (var key in this.piskelController) {
       if (typeof this.piskelController[key] == 'function') {
@@ -136,6 +140,15 @@
     }
   };
 
+  ns.DrawingTestRecorder.prototype.onClipboardEvent_ = function (evt) {
+    if (this.isRecording) {
+      var recordEvent = {};
+      recordEvent.type = 'clipboard-event';
+      recordEvent.event = evt;
+      this.events.push(recordEvent);
+    }
+  };
+
   ns.DrawingTestRecorder.prototype.onInstrumentedMethod_ = function (callee, methodName, args) {
     if (this.isRecording) {
       var recordEvent = {};

src/js/model/Piskel.js

@@ -16,7 +16,7 @@
       this.descriptor = descriptor;
       this.savePath = null;
       this.fps = fps;
-
+      this.hiddenFrames = [];
     } else {
       throw 'Missing arguments in Piskel constructor : ' + Array.prototype.join.call(arguments, ',');
     }

src/js/rendering/frame/BackgroundImageFrameRenderer.js

@@ -5,11 +5,10 @@
     this.container = container;
     this.setZoom(zoom);
 
-    var containerEl = container.get(0);
+    var containerDocument = container.ownerDocument;
-    var containerDocument = containerEl.ownerDocument;
     this.frameContainer = containerDocument.createElement('div');
     this.frameContainer.classList.add('background-image-frame-container');
-    container.get(0).appendChild(this.frameContainer);
+    container.appendChild(this.frameContainer);
 
     this.cachedFrameProcessor = new pskl.model.frame.CachedFrameProcessor();
     this.cachedFrameProcessor.setFrameProcessor(this.frameToDataUrl_.bind(this));

src/js/rendering/frame/CachedFrameRenderer.js

@@ -34,6 +34,7 @@
     var serializedFrame = [
       this.getZoom(),
       this.getGridWidth(),
+      this.getGridSpacing(),
       this.getGridColor(),
       pskl.UserSettings.get('SEAMLESS_MODE'),
       pskl.UserSettings.get('SEAMLESS_OPACITY'),

src/js/rendering/frame/FrameRenderer.js

@@ -56,6 +56,7 @@
     this.setDisplaySize(renderingOptions.width, renderingOptions.height);
 
     this.setGridWidth(this.getUserGridWidth_());
+    this.setGridSpacing(this.getUserGridSpacing_());
 
     $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
   };
@@ -106,7 +107,7 @@
     this.displayWidth = width;
     this.displayHeight = height;
     if (this.displayCanvas) {
-      $(this.displayCanvas).remove();
+      this.displayCanvas.parentNode.removeChild(this.displayCanvas);
       this.displayCanvas = null;
     }
     this.createDisplayCanvas_();
@@ -146,6 +147,10 @@
     this.gridWidth_ = value;
   };
 
+  ns.FrameRenderer.prototype.setGridSpacing = function (value) {
+    this.gridSpacing_ = value;
+  };
+
   ns.FrameRenderer.prototype.getGridWidth = function () {
     if (!this.supportGridRendering) {
       return 0;
@@ -154,15 +159,29 @@
     return this.gridWidth_;
   };
 
+  ns.FrameRenderer.prototype.getGridSpacing = function () {
+    if (!this.supportGridRendering) {
+      return 0;
+    }
+
+    return this.gridSpacing_;
+  };
+
   /**
    * Compute a grid width value best suited to the current display context,
    * particularly for the current zoom level
    */
   ns.FrameRenderer.prototype.computeGridWidthForDisplay_ = function () {
+    var gridSpacing = this.getGridSpacing();
+    if (this.zoom * gridSpacing < 6) {
+      return 0;
+    }
+
     var gridWidth = this.getGridWidth();
-    while (this.zoom < 6 * gridWidth) {
+    while (gridWidth > 1 && this.zoom < 6 * gridWidth) {
       gridWidth--;
     }
+
     return gridWidth;
   };
 
@@ -180,13 +199,16 @@
 
     this.displayCanvas = pskl.utils.CanvasUtils.createCanvas(width, height, this.classList);
     pskl.utils.CanvasUtils.disableImageSmoothing(this.displayCanvas);
-    this.container.append(this.displayCanvas);
+    this.container.appendChild(this.displayCanvas);
   };
 
   ns.FrameRenderer.prototype.onUserSettingsChange_ = function (evt, settingName, settingValue) {
     var settings = pskl.UserSettings;
-    if (settingName == settings.GRID_WIDTH || settingName == settings.GRID_ENABLED) {
+    if (settingName == settings.GRID_WIDTH ||
+        settingName == settings.GRID_SPACING ||
+        settingName == settings.GRID_ENABLED) {
       this.setGridWidth(this.getUserGridWidth_());
+      this.setGridSpacing(this.getUserGridSpacing_());
     }
   };
 
@@ -196,15 +218,21 @@
     return gridEnabled ? width : 0;
   };
 
+  ns.FrameRenderer.prototype.getUserGridSpacing_ = function () {
+    var gridEnabled = pskl.UserSettings.get(pskl.UserSettings.GRID_ENABLED);
+    var spacing = pskl.UserSettings.get(pskl.UserSettings.GRID_SPACING);
+    return gridEnabled ? spacing : 0;
+  };
+
   /**
    * Transform a screen pixel-based coordinate (relative to the top-left corner of the rendered
    * frame) into a sprite coordinate in column and row.
    * @public
    */
   ns.FrameRenderer.prototype.getCoordinates = function(x, y) {
-    var containerOffset = this.container.offset();
+    var containerRect = this.container.getBoundingClientRect();
-    x = x - containerOffset.left;
+    x = x - containerRect.left;
-    y = y - containerOffset.top;
+    y = y - containerRect.top;
 
     // apply margins
     x = x - this.margin.x;
@@ -233,9 +261,9 @@
     x = x + this.margin.x;
     y = y + this.margin.y;
 
-    var containerOffset = this.container.offset();
+    var containerRect = this.container.getBoundingClientRect();
-    x = x + containerOffset.left;
+    x = x + containerRect.left;
-    y = y + containerOffset.top;
+    y = y + containerRect.top;
 
     return {
       x : x + (cellSize / 2),
@@ -298,6 +326,7 @@
 
     // Draw grid.
     var gridWidth = this.computeGridWidthForDisplay_();
+    var gridSpacing = this.getGridSpacing();
     if (gridWidth > 0) {
       var gridColor = this.getGridColor();
       // Scale out before drawing the grid.
@@ -313,13 +342,17 @@
 
       // Draw or clear vertical lines.
       for (var i = 1 ; i < frame.getWidth() ; i++) {
+        if (i % gridSpacing == 0) {
           drawOrClear((i * z) - (gridWidth / 2), 0, gridWidth, h * z);
         }
+      }
       // Draw or clear horizontal lines.
       for (var j = 1 ; j < frame.getHeight() ; j++) {
+        if (j % gridSpacing == 0) {
           drawOrClear(0, (j * z) - (gridWidth / 2), w * z, gridWidth);
         }
       }
+    }
 
     displayContext.restore();
   };

src/js/rendering/layer/LayersRenderer.js

@@ -23,7 +23,7 @@
     this.updateLayersCanvasOpacity_(pskl.UserSettings.get(pskl.UserSettings.LAYER_OPACITY));
 
     $.subscribe(Events.PISKEL_RESET, this.flush.bind(this));
-    $.subscribe(Events.USER_SETTINGS_CHANGED, $.proxy(this.onUserSettingsChange_, this));
+    $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
   };
 
   pskl.utils.inherit(pskl.rendering.layer.LayersRenderer, pskl.rendering.CompositeRenderer);

src/js/selection/BaseSelection.js

@@ -5,9 +5,23 @@
     this.reset();
   };
 
+  ns.BaseSelection.prototype.stringify = function () {
+    return JSON.stringify({
+      pixels: this.pixels,
+      time: this.time
+    });
+  };
+
+  ns.BaseSelection.prototype.parse = function (str) {
+    var selectionData = JSON.parse(str);
+    this.pixels = selectionData.pixels;
+    this.time = selectionData.time;
+  };
+
   ns.BaseSelection.prototype.reset = function () {
     this.pixels = [];
     this.hasPastedContent = false;
+    this.time = -1;
   };
 
   ns.BaseSelection.prototype.move = function (colDiff, rowDiff) {
@@ -30,5 +44,8 @@
     });
 
     this.hasPastedContent = true;
+    // Keep track of the selection time to compare between local selection and
+    // paste event selections.
+    this.time = Date.now();
   };
 })();

src/js/selection/SelectionManager.js

@@ -14,21 +14,18 @@
   };
 
   ns.SelectionManager.prototype.init = function () {
-    $.subscribe(Events.SELECTION_CREATED, $.proxy(this.onSelectionCreated_, this));
+    $.subscribe(Events.SELECTION_CREATED, this.onSelectionCreated_.bind(this));
-    $.subscribe(Events.SELECTION_DISMISSED, $.proxy(this.onSelectionDismissed_, this));
+    $.subscribe(Events.SELECTION_DISMISSED, this.onSelectionDismissed_.bind(this));
-    $.subscribe(Events.SELECTION_MOVE_REQUEST, $.proxy(this.onSelectionMoved_, this));
+    $.subscribe(Events.SELECTION_MOVE_REQUEST, this.onSelectionMoved_.bind(this));
-    $.subscribe(Events.SELECTION_COPY, this.copy.bind(this));
+    $.subscribe(Events.CLIPBOARD_COPY, this.copy.bind(this));
-    $.subscribe(Events.SELECTION_CUT, this.cut.bind(this));
+    $.subscribe(Events.CLIPBOARD_CUT, this.copy.bind(this));
-    $.subscribe(Events.SELECTION_PASTE, this.paste.bind(this));
+    $.subscribe(Events.CLIPBOARD_PASTE, this.paste.bind(this));
 
     var shortcuts = pskl.service.keyboard.Shortcuts;
-    pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.PASTE, this.paste.bind(this));
-    pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.CUT, this.cut.bind(this));
-    pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.COPY, this.copy.bind(this));
     pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.DELETE, this.onDeleteShortcut_.bind(this));
     pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.COMMIT, this.commit.bind(this));
 
-    $.subscribe(Events.TOOL_SELECTED, $.proxy(this.onToolSelected_, this));
+    $.subscribe(Events.TOOL_SELECTED, this.onToolSelected_.bind(this));
   };
 
   /**
@@ -78,29 +75,85 @@
       scope : this,
       replay : {
         type : SELECTION_REPLAY.ERASE,
-        pixels : JSON.parse(JSON.stringify(pixels.slice(0)))
+        pixels : JSON.parse(JSON.stringify(pixels))
       }
     });
   };
 
-  ns.SelectionManager.prototype.cut = function() {
+  ns.SelectionManager.prototype.copy = function(event, domEvent) {
-    if (this.currentSelection) {
+    if (this.currentSelection && this.piskelController.getCurrentFrame()) {
-      // Put cut target into the selection:
       this.currentSelection.fillSelectionFromFrame(this.piskelController.getCurrentFrame());
+      if (domEvent) {
+        domEvent.clipboardData.setData('text/plain', this.currentSelection.stringify());
+        domEvent.preventDefault();
+      }
+      if (event.type === Events.CLIPBOARD_CUT) {
         this.erase();
       }
+    }
   };
 
-  ns.SelectionManager.prototype.paste = function() {
+  ns.SelectionManager.prototype.paste = function(event, domEvent) {
-    if (!this.currentSelection || !this.currentSelection.hasPastedContent) {
+    var items = domEvent ? domEvent.clipboardData.items : [];
-      if (window.localStorage.getItem('piskel.clipboard')) {
+
-        this.currentSelection = JSON.parse(window.localStorage.getItem('piskel.clipboard'));
+    try {
-      } else {
+      for (var i = 0 ; i < items.length ; i++) {
+        var item = items[i];
+
+        if (/^image/i.test(item.type)) {
+          this.pasteImage_(item);
+          event.stopPropagation();
+          return;
+        }
+
+        if (/^text\/plain/i.test(item.type)) {
+          this.pasteText_(item);
+          event.stopPropagation();
           return;
         }
       }
+    } catch (e) {
+      // Some of the clipboard APIs are not available on Safari/IE
+      // Allow Piskel to fallback on local currentSelection pasting.
+    }
 
-    var pixels = this.currentSelection.pixels;
+    // temporarily keeping this code path for tests and fallbacks.
+    if (this.currentSelection && this.currentSelection.hasPastedContent) {
+      this.pastePixelsOnCurrentFrame_(this.currentSelection.pixels);
+    }
+  };
+
+  ns.SelectionManager.prototype.pasteImage_ = function(clipboardItem) {
+    var blob = clipboardItem.getAsFile();
+    pskl.utils.FileUtils.readImageFile(blob, function (image) {
+      pskl.app.fileDropperService.dropPosition_ = {x: 0, y: 0};
+      pskl.app.fileDropperService.onImageLoaded_(image, blob);
+    }.bind(this));
+  };
+
+  ns.SelectionManager.prototype.pasteText_ = function(clipboardItem) {
+    var blob = clipboardItem.getAsString(function (selectionString) {
+      var selectionData = JSON.parse(selectionString);
+      var time = selectionData.time;
+      var pixels = selectionData.pixels;
+
+      if (this.currentSelection && this.currentSelection.time >= time) {
+        // If the local selection is newer or equal to the one coming from the clipboard event
+        // use the local one. The reason is that the "move" information is only updated locally
+        // without synchronizing it to the clipboard.
+        // TODO: the selection should store the origin of the selection and the selection itself
+        // separately.
+        pixels = this.currentSelection.pixels;
+      }
+
+      if (pixels) {
+        // If the current clipboard data is some random text, pixels will not be defined.
+        this.pastePixelsOnCurrentFrame_(pixels);
+      }
+    }.bind(this));
+  };
+
+  ns.SelectionManager.prototype.pastePixelsOnCurrentFrame_ = function (pixels) {
     var frame = this.piskelController.getCurrentFrame();
 
     this.pastePixels_(frame, pixels);
@@ -123,8 +176,7 @@
     var tool = pskl.app.drawingController.currentToolBehavior;
     var isSelectionTool = tool instanceof pskl.tools.drawing.selection.BaseSelect;
     if (isSelectionTool) {
-      var overlay = pskl.app.drawingController.overlayFrame;
+      tool.commitSelection();
-      tool.commitSelection(overlay);
     }
   };
 
@@ -147,13 +199,6 @@
     });
   };
 
-  ns.SelectionManager.prototype.copy = function() {
-    if (this.currentSelection && this.piskelController.getCurrentFrame()) {
-      this.currentSelection.fillSelectionFromFrame(this.piskelController.getCurrentFrame());
-      window.localStorage.setItem('piskel.clipboard', JSON.stringify(this.currentSelection));
-    }
-  };
-
   /**
    * @private
    */

src/js/service/BackupService.js

@@ -1,65 +1,161 @@
 (function () {
   var ns = $.namespace('pskl.service');
 
-  // 1 minute = 1000 * 60
+  var ONE_SECOND = 1000;
-  var BACKUP_INTERVAL = 1000 * 60;
+  var ONE_MINUTE = 60 * ONE_SECOND;
 
-  ns.BackupService = function (piskelController) {
+  // Save every minute = 1000 * 60
+  var BACKUP_INTERVAL = ONE_MINUTE;
+  // Store a new snapshot every 5 minutes.
+  var SNAPSHOT_INTERVAL = ONE_MINUTE * 5;
+  // Store up to 12 snapshots for a piskel session, min. 1 hour of work
+  var MAX_SNAPSHOTS_PER_SESSION = 12;
+  var MAX_SESSIONS = 10;
+
+  ns.BackupService = function (piskelController, backupDatabase) {
     this.piskelController = piskelController;
-    this.lastHash = null;
+    // Immediately store the current when initializing the Service to avoid storing
+    // empty sessions.
+    this.lastHash = this.piskelController.getPiskel().getHash();
+    this.nextSnapshotDate = -1;
+
+    // backupDatabase can be provided for testing purposes.
+    this.backupDatabase = backupDatabase || new pskl.database.BackupDatabase();
   };
 
   ns.BackupService.prototype.init = function () {
-    var previousPiskel = window.localStorage.getItem('bkp.next.piskel');
+    this.backupDatabase.init().then(function () {
-    var previousInfo = window.localStorage.getItem('bkp.next.info');
-    if (previousPiskel && previousInfo) {
-      this.savePiskel_('prev', previousPiskel, previousInfo);
-    }
-
       window.setInterval(this.backup.bind(this), BACKUP_INTERVAL);
+    }.bind(this));
+  };
+
+  // This is purely exposed for testing, so that backup dates can be set programmatically.
+  ns.BackupService.prototype.currentDate_ = function () {
+    return Date.now();
   };
 
   ns.BackupService.prototype.backup = function () {
     var piskel = this.piskelController.getPiskel();
-    var descriptor = piskel.getDescriptor();
     var hash = piskel.getHash();
-    var info = {
-      name : descriptor.name,
-      description : descriptor.info,
-      date : Date.now(),
-      hash : hash
-    };
 
     // Do not save an unchanged piskel
-    if (hash !== this.lastHash) {
+    if (hash === this.lastHash) {
+      return Q.resolve();
+    }
+
+    // Update the hash
+    // TODO: should only be done after a successful save.
     this.lastHash = hash;
-      var serializedPiskel = pskl.utils.serialization.Serializer.serialize(piskel);
+
-      this.savePiskel_('next', serializedPiskel, JSON.stringify(info));
+    // Prepare the backup snapshot.
-    }
+    var descriptor = piskel.getDescriptor();
+    var date = this.currentDate_();
+    var snapshot = {
+      session_id: pskl.app.sessionId,
+      date: date,
+      name: descriptor.name,
+      description: descriptor.description,
+      frames: piskel.getFrameCount(),
+      width: piskel.getWidth(),
+      height: piskel.getHeight(),
+      fps: piskel.getFPS(),
+      serialized: pskl.utils.serialization.Serializer.serialize(piskel)
     };
 
-  ns.BackupService.prototype.getPreviousPiskelInfo = function () {
+    return this.getSnapshotsBySessionId(pskl.app.sessionId).then(function (snapshots) {
-    var previousInfo = window.localStorage.getItem('bkp.prev.info');
+      var latest = snapshots[0];
-    if (previousInfo) {
+
-      return JSON.parse(previousInfo);
+      if (latest && date < this.nextSnapshotDate) {
+        // update the latest snapshot
+        snapshot.id = latest.id;
+        return this.backupDatabase.updateSnapshot(snapshot);
+      } else {
+        // add a new snapshot
+        this.nextSnapshotDate = date + SNAPSHOT_INTERVAL;
+        return this.backupDatabase.createSnapshot(snapshot).then(function () {
+          if (snapshots.length >= MAX_SNAPSHOTS_PER_SESSION) {
+            // remove oldest snapshot
+            return this.backupDatabase.deleteSnapshot(snapshots[snapshots.length - 1]);
+          }
+        }.bind(this)).then(function () {
+          var isNewSession = !latest;
+          if (!isNewSession) {
+            return;
+          }
+          return this.backupDatabase.getSessions().then(function (sessions) {
+            if (sessions.length <= MAX_SESSIONS) {
+              // If MAX_SESSIONS has not been reached, no need to delete
+              // previous sessions.
+              return;
             }
-  };
 
-  ns.BackupService.prototype.load = function() {
+            // Prepare an array containing all the ids of the sessions to be deleted.
-    var previousPiskel = window.localStorage.getItem('bkp.prev.piskel');
+            var sessionIdsToDelete = sessions.sort(function (s1, s2) {
-    previousPiskel = JSON.parse(previousPiskel);
+              return s1.startDate - s2.startDate;
+            }).map(function (s) {
+              return s.id;
+            }).slice(0, sessions.length - MAX_SESSIONS);
 
-    pskl.utils.serialization.Deserializer.deserialize(previousPiskel, function (piskel) {
+            // Delete all the extra sessions.
-      pskl.app.piskelController.setPiskel(piskel);
+            return Q.all(sessionIdsToDelete.map(function (id) {
+              return this.deleteSession(id);
+            }.bind(this)));
+          }.bind(this));
+        }.bind(this));
+      }
+    }.bind(this)).catch(function (e) {
+      console.error(e);
     });
   };
 
-  ns.BackupService.prototype.savePiskel_ = function (type, piskel, info) {
+  ns.BackupService.prototype.getSnapshotsBySessionId = function (sessionId) {
-    try {
+    return this.backupDatabase.getSnapshotsBySessionId(sessionId);
-      window.localStorage.setItem('bkp.' + type + '.piskel', piskel);
+  };
-      window.localStorage.setItem('bkp.' + type + '.info', info);
+
-    } catch (e) {
+  ns.BackupService.prototype.deleteSession = function (sessionId) {
-      console.error('Could not save piskel backup in localStorage.', e);
+    return this.backupDatabase.deleteSnapshotsForSession(sessionId);
+  };
+
+  ns.BackupService.prototype.getPreviousPiskelInfo = function () {
+    return this.backupDatabase.findLastSnapshot(function (snapshot) {
+      return snapshot.session_id !== pskl.app.sessionId;
+    });
+  };
+
+  ns.BackupService.prototype.list = function() {
+    return this.backupDatabase.getSessions();
+  };
+
+  ns.BackupService.prototype.loadSnapshotById = function(snapshotId) {
+    var deferred = Q.defer();
+
+    this.backupDatabase.getSnapshot(snapshotId).then(function (snapshot) {
+      pskl.utils.serialization.Deserializer.deserialize(
+        JSON.parse(snapshot.serialized),
+        function (piskel) {
+          pskl.app.piskelController.setPiskel(piskel);
+          deferred.resolve();
         }
+      );
+    });
+
+    return deferred.promise;
+  };
+
+  // Load "latest" backup snapshot.
+  ns.BackupService.prototype.load = function() {
+    var deferred = Q.defer();
+
+    this.getPreviousPiskelInfo().then(function (snapshot) {
+      pskl.utils.serialization.Deserializer.deserialize(
+        JSON.parse(snapshot.serialized),
+        function (piskel) {
+          pskl.app.piskelController.setPiskel(piskel);
+          deferred.resolve();
+        }
+      );
+    });
+
+    return deferred.promise;
   };
 })();

src/js/service/BeforeUnloadService.js

@@ -30,6 +30,8 @@
   };
 
   ns.BeforeUnloadService.prototype.onBeforeUnload = function (evt) {
+    // Attempt one last backup. Some of it may fail due to the asynchronous
+    // nature of IndexedDB.
     pskl.app.backupService.backup();
     if (pskl.app.savedStatusService.isDirty()) {
       var confirmationMessage = 'Your current sprite has unsaved changes. Are you sure you want to quit?';

src/js/service/ClipboardService.js

@@ -0,0 +1,25 @@
+(function () {
+  var ns = $.namespace('pskl.service');
+
+  ns.ClipboardService = function (piskelController) {
+    this.piskelController = piskelController;
+  };
+
+  ns.ClipboardService.prototype.init = function () {
+    window.addEventListener('copy', this._onCopy.bind(this), true);
+    window.addEventListener('cut', this._onCut.bind(this), true);
+    window.addEventListener('paste', this._onPaste.bind(this), true);
+  };
+
+  ns.ClipboardService.prototype._onCut = function (event) {
+    $.publish(Events.CLIPBOARD_CUT, event);
+  };
+
+  ns.ClipboardService.prototype._onCopy = function (event) {
+    $.publish(Events.CLIPBOARD_COPY, event);
+  };
+
+  ns.ClipboardService.prototype._onPaste = function (event) {
+    $.publish(Events.CLIPBOARD_PASTE, event);
+  };
+})();

src/js/service/FileDropperService.js

@@ -35,13 +35,9 @@
       var isPiskel = /\.piskel$/i.test(file.name);
       var isPalette = /\.(gpl|txt|pal)$/i.test(file.name);
       if (isImage) {
-        $.publish(Events.DIALOG_SHOW, {
+        pskl.utils.FileUtils.readImageFile(file, function (image) {
-          dialogId : 'import',
+          this.onImageLoaded_(image, file);
-          initArgs : {
+        }.bind(this));
-            rawFiles: [file]
-          }
-        });
-        // pskl.utils.FileUtils.readImageFile(file, this.onImageLoaded_.bind(this));
       } else if (isPiskel) {
         pskl.utils.PiskelFileUtils.loadFromFile(file, this.onPiskelFileLoaded_, this.onPiskelFileError_);
       } else if (isPalette) {
@@ -56,7 +52,7 @@
   };
 
   ns.FileDropperService.prototype.onPiskelFileLoaded_ = function (piskel) {
-    if (window.confirm('This will replace your current animation')) {
+    if (window.confirm(Constants.CONFIRM_OVERWRITE)) {
       pskl.app.piskelController.setPiskel(piskel);
     }
   };
@@ -65,10 +61,23 @@
     $.publish(Events.PISKEL_FILE_IMPORT_FAILED, [reason]);
   };
 
-  ns.FileDropperService.prototype.onImageLoaded_ = function (importedImage) {
+  ns.FileDropperService.prototype.onImageLoaded_ = function (importedImage, file) {
+    var piskelWidth = pskl.app.piskelController.getWidth();
+    var piskelHeight = pskl.app.piskelController.getHeight();
+
     if (this.isMultipleFiles_) {
       this.piskelController.addFrameAtCurrentIndex();
       this.piskelController.selectNextFrame();
+    } else if (importedImage.width > piskelWidth || importedImage.height > piskelHeight) {
+      // For single file imports, if the file is too big, trigger the import wizard.
+      $.publish(Events.DIALOG_SHOW, {
+        dialogId : 'import',
+        initArgs : {
+          rawFiles: [file]
+        }
+      });
+
+      return;
     }
 
     var currentFrame = this.piskelController.getCurrentFrame();

src/js/service/ImageUploadService.js

@@ -15,10 +15,17 @@
       data : imageData
     };
 
+    var protocol = pskl.utils.Environment.isHttps() ? 'https' : 'http';
     var wrappedSuccess = function (response) {
-      success(Constants.IMAGE_SERVICE_GET_URL + response.responseText);
+      var getUrl = pskl.utils.Template.replace(Constants.IMAGE_SERVICE_GET_URL, {
+        protocol: protocol
+      });
+      success(getUrl + response.responseText);
     };
 
-    pskl.utils.Xhr.post(Constants.IMAGE_SERVICE_UPLOAD_URL, data, wrappedSuccess, error);
+    var uploadUrl = pskl.utils.Template.replace(Constants.IMAGE_SERVICE_UPLOAD_URL, {
+      protocol: protocol
+    });
+    pskl.utils.Xhr.post(uploadUrl, data, wrappedSuccess, error);
   };
 })();

src/js/service/keyboard/ShortcutService.js

@@ -9,7 +9,7 @@
    * @public
    */
   ns.ShortcutService.prototype.init = function() {
-    $(document.body).keydown($.proxy(this.onKeyDown_, this));
+    document.body.addEventListener('keydown', this.onKeyDown_.bind(this));
   };
 
   /**

src/js/service/keyboard/Shortcuts.js

@@ -59,6 +59,7 @@
       BEST_PREVIEW : createShortcut('best-preview', 'Select best size preview', 'alt+2'),
       FULL_PREVIEW : createShortcut('full-preview', 'Select full size preview', 'alt+3'),
       ONION_SKIN : createShortcut('onion-skin', 'Toggle onion skin', 'alt+O'),
+      TOGGLE_GRID : createShortcut('toggle-grid', 'Show/Hide grid', 'alt+G'),
       LAYER_PREVIEW : createShortcut('layer-preview', 'Toggle layer preview', 'alt+L'),
       MERGE_ANIMATION : createShortcut('import-animation', 'Open merge animation popup', 'ctrl+shift+M'),
       CLOSE_POPUP : createShortcut('close-popup', 'Close an opened popup', 'ESC'),
@@ -84,6 +85,10 @@
         '123456789'.split(''), '1 to 9')
     },
 
+    DEBUG : {
+      RELOAD_STYLES : createShortcut('move-left', 'Move viewport left', 'ctrl+alt+R'),
+    },
+
     CATEGORIES : ['TOOL', 'SELECTION', 'MISC', 'STORAGE', 'COLOR']
   };
 })();

src/js/service/palette/PaletteService.js

@@ -3,11 +3,12 @@
 
   ns.PaletteService = function () {
     this.dynamicPalettes = [];
-    this.localStorageService = window.localStorage;
+    // Exposed for tests.
+    this.localStorageGlobal = window.localStorage;
   };
 
   ns.PaletteService.prototype.getPalettes = function () {
-    var palettesString = this.localStorageService.getItem('piskel.palettes');
+    var palettesString = this.localStorageGlobal.getItem('piskel.palettes');
     var palettes = JSON.parse(palettesString) || [];
     palettes = palettes.map(function (palette) {
       return pskl.model.Palette.fromObject(palette);
@@ -54,7 +55,7 @@
     palettes = palettes.filter(function (palette) {
       return this.dynamicPalettes.indexOf(palette) === -1;
     }.bind(this));
-    this.localStorageService.setItem('piskel.palettes', JSON.stringify(palettes));
+    this.localStorageGlobal.setItem('piskel.palettes', JSON.stringify(palettes));
     $.publish(Events.PALETTE_LIST_UPDATED);
   };
 

src/js/service/performance/PerformanceReport.js

@@ -16,7 +16,7 @@
    */
   ns.PerformanceReport = function (piskel, colorsCount) {
     var pixels = piskel.getWidth() * piskel.getHeight();
-    this.resolution = pixels > (500 * 500);
+    this.resolution = pixels > (512 * 512);
 
     var layersCount = piskel.getLayers().length;
     this.layers = layersCount > 25;
@@ -24,10 +24,10 @@
     var framesCount = piskel.getLayerAt(0).size();
     this.frames = framesCount > 100;
 
-    this.colors = colorsCount > 100;
+    this.colors = colorsCount >= 256;
 
-    var overallScore = (pixels / 2500) + (layersCount * 4) + framesCount + colorsCount;
+    var overallScore = (pixels / 2620) + (layersCount * 4) + framesCount + (colorsCount * 100 / 256);
-    this.overall = overallScore > 100;
+    this.overall = overallScore > 200;
   };
 
   ns.PerformanceReport.prototype.equals = function (report) {

src/js/service/storage/IndexedDbStorageService.js

@@ -0,0 +1,57 @@
+(function () {
+  var ns = $.namespace('pskl.service.storage');
+
+  ns.IndexedDbStorageService = function (piskelController) {
+    this.piskelController = piskelController;
+    this.piskelDatabase = new pskl.database.PiskelDatabase();
+  };
+
+  ns.IndexedDbStorageService.prototype.init = function () {
+    this.piskelDatabase.init().catch(function (e) {
+      console.log('Failed to initialize PiskelDatabase, local browser saves will be unavailable.');
+    });
+  };
+
+  ns.IndexedDbStorageService.prototype.save = function (piskel) {
+    var name = piskel.getDescriptor().name;
+    var description = piskel.getDescriptor().description;
+    var date = Date.now();
+    var serialized = pskl.utils.serialization.Serializer.serialize(piskel);
+
+    return this.save_(name, description, date, serialized);
+  };
+
+  ns.IndexedDbStorageService.prototype.save_ = function (name, description, date, serialized) {
+    return this.piskelDatabase.get(name).then(function (piskelData) {
+      if (typeof piskelData !== 'undefined') {
+        return this.piskelDatabase.update(name, description, date, serialized);
+      } else {
+        return this.piskelDatabase.create(name, description, date, serialized);
+      }
+    }.bind(this));
+  };
+
+  ns.IndexedDbStorageService.prototype.load = function (name) {
+    return this.piskelDatabase.get(name).then(function (piskelData) {
+      if (typeof piskelData !== 'undefined') {
+        var serialized = piskelData.serialized;
+        pskl.utils.serialization.Deserializer.deserialize(
+          JSON.parse(serialized),
+          function (piskel) {
+            pskl.app.piskelController.setPiskel(piskel);
+          }
+        );
+      } else {
+        console.log('no local browser save found for name: ' + name);
+      }
+    });
+  };
+
+  ns.IndexedDbStorageService.prototype.remove = function (name) {
+    return this.piskelDatabase.delete(name);
+  };
+
+  ns.IndexedDbStorageService.prototype.getKeys = function () {
+    return this.piskelDatabase.list();
+  };
+})();

src/js/service/storage/StorageService.js

@@ -27,10 +27,15 @@
     return this.delegateSave_(pskl.app.galleryStorageService, piskel);
   };
 
+  // @deprecated, use saveToIndexedDb unless indexedDb is not available.
   ns.StorageService.prototype.saveToLocalStorage = function (piskel) {
     return this.delegateSave_(pskl.app.localStorageService, piskel);
   };
 
+  ns.StorageService.prototype.saveToIndexedDb = function (piskel) {
+    return this.delegateSave_(pskl.app.indexedDbStorageService, piskel);
+  };
+
   ns.StorageService.prototype.saveToFileDownload = function (piskel) {
     return this.delegateSave_(pskl.app.fileDownloadStorageService, piskel);
   };
@@ -67,7 +72,7 @@
       // wrap in timeout in order to start saving only after event.preventDefault
       // has been done
       window.setTimeout(function () {
-        this.saveToLocalStorage(this.piskelController.getPiskel());
+        this.saveToIndexedDb(this.piskelController.getPiskel());
       }.bind(this), 0);
     }
   };

src/js/tools/drawing/VerticalMirrorPen.js

@@ -44,10 +44,17 @@
   };
 
   ns.VerticalMirrorPen.prototype.getSymmetricCol_ = function(col, frame) {
-    return frame.getWidth() - col - 1;
+    return frame.getWidth() - col - this.getPenSizeOffset_();
   };
 
   ns.VerticalMirrorPen.prototype.getSymmetricRow_ = function(row, frame) {
-    return frame.getHeight() - row - 1;
+    return frame.getHeight() - row - this.getPenSizeOffset_();
+  };
+
+  /**
+   * Depending on the pen size, the mirrored index need to have an offset of 1 pixel.
+   */
+  ns.VerticalMirrorPen.prototype.getPenSizeOffset_ = function(row, frame) {
+    return pskl.app.penSizeService.getPenSize() % 2;
   };
 })();

src/js/tools/drawing/selection/AbstractDragSelect.js

@@ -16,7 +16,7 @@
   ns.AbstractDragSelect.prototype.onSelectStart_ = function (col, row, frame, overlay) {
     if (this.hasSelection) {
       this.hasSelection = false;
-      this.commitSelection(overlay);
+      this.commitSelection();
     } else {
       this.hasSelection = true;
       this.onDragSelectStart_(col, row);

src/js/tools/drawing/selection/BaseSelect.js

@@ -8,7 +8,6 @@
 
   ns.BaseSelect = function() {
     this.secondaryToolId = pskl.tools.drawing.Move.TOOL_ID;
-    this.bodyRoot = $('body');
 
     // Select's first point coordinates (set in applyToolAt)
     this.startCol = null;
@@ -26,6 +25,8 @@
       {key : 'ctrl+v', description : 'Paste the copied area'},
       {key : 'shift', description : 'Hold to move the content'}
     ];
+
+    $.subscribe(Events.SELECTION_DISMISSED, this.onSelectionDismissed_.bind(this));
   };
 
   pskl.utils.inherit(ns.BaseSelect, pskl.tools.drawing.BaseTool);
@@ -41,7 +42,7 @@
     this.lastMoveRow = row;
 
     // The select tool can be in two different state.
-    // If the inital click of the tool is not on a selection, we go in 'select'
+    // If the initial click of the tool is not on a selection, we go in 'select'
     // mode to create a selection.
     // If the initial click is on a previous selection, we go in 'moveSelection'
     // mode to allow to move the selection by drag'n dropping it.
@@ -52,7 +53,7 @@
       this.mode = 'moveSelection';
       if (event.shiftKey && !this.isMovingContent_) {
         this.isMovingContent_ = true;
-        $.publish(Events.SELECTION_CUT);
+        $.publish(Events.CLIPBOARD_CUT);
         this.drawSelectionOnOverlay_(overlay);
       }
       this.onSelectionMoveStart_(col, row, frame, overlay);
@@ -90,12 +91,12 @@
     if (overlay.containsPixel(col, row)) {
       if (this.isInSelection(col, row)) {
         // We're hovering the selection, show the move tool:
-        this.bodyRoot.addClass(this.secondaryToolId);
+        document.body.classList.add(this.secondaryToolId);
-        this.bodyRoot.removeClass(this.toolId);
+        document.body.classList.remove(this.toolId);
       } else {
         // We're not hovering the selection, show create selection tool:
-        this.bodyRoot.addClass(this.toolId);
+        document.body.classList.add(this.toolId);
-        this.bodyRoot.removeClass(this.secondaryToolId);
+        document.body.classList.remove(this.secondaryToolId);
       }
     }
 
@@ -111,16 +112,24 @@
   };
 
   /**
-   * Protected method, should be called when the selection is dismissed.
+   * Protected method, should be called when the selection is committed,
+   * typically by clicking outside of the selected area.
    */
-  ns.BaseSelect.prototype.commitSelection = function (overlay) {
+  ns.BaseSelect.prototype.commitSelection = function () {
     if (this.isMovingContent_) {
-      $.publish(Events.SELECTION_PASTE);
+      $.publish(Events.CLIPBOARD_PASTE);
       this.isMovingContent_ = false;
     }
 
     // Clean previous selection:
     $.publish(Events.SELECTION_DISMISSED);
+  };
+
+  /**
+   * Protected method, should be called when the selection is dismissed.
+   */
+  ns.BaseSelect.prototype.onSelectionDismissed_ = function () {
+    var overlay = pskl.app.drawingController.overlayFrame;
     overlay.clear();
     this.hasSelection = false;
   };

src/js/tools/drawing/selection/RectangleSelect.js

@@ -24,8 +24,8 @@
 
   /**
    * When creating the rectangle selection, we clear the current overlayFrame and
-   * redraw the current rectangle based on the orgin coordinate and
+   * redraw the current rectangle based on the origin coordinate and
-   * the current mouse coordiinate in sprite.
+   * the current mouse coordinate in sprite.
    * @override
    */
   ns.RectangleSelect.prototype.onDragSelect_ = function (col, row, frame, overlay) {

src/js/tools/drawing/selection/ShapeSelect.js

@@ -18,13 +18,13 @@
 
   /**
    * For the shape select tool, you just need to click one time to create a selection.
-   * So we jsut need to implement onSelectStart_ (no need for onSelect_ & onSelectEnd_)
+   * So we just need to implement onSelectStart_ (no need for onSelect_ & onSelectEnd_)
    * @override
    */
   ns.ShapeSelect.prototype.onSelectStart_ = function (col, row, frame, overlay) {
     if (this.hasSelection) {
       this.hasSelection = false;
-      this.commitSelection(overlay);
+      this.commitSelection();
     } else {
       this.hasSelection = true;
       // From the pixel clicked, get shape using an algorithm similar to the paintbucket one:

src/js/utils/Environment.js

@@ -23,7 +23,15 @@
 
     isIntegrationTest : function () {
       return window.location.href.indexOf('integration-test') !== -1;
-    }
+    },
+
+    isDebug : function () {
+      return window.location.href.indexOf('debug') !== -1;
+    },
+
+    isHttps : function () {
+      return window.location.href.indexOf('https://') === 0;
+    },
   };
 
 })();

src/js/utils/UserSettings.js

@@ -5,6 +5,7 @@
     GRID_COLOR : 'GRID_COLOR',
     GRID_ENABLED : 'GRID_ENABLED',
     GRID_WIDTH : 'GRID_WIDTH',
+    GRID_SPACING : 'GRID_SPACING',
     MAX_FPS : 'MAX_FPS',
     DEFAULT_SIZE : 'DEFAULT_SIZE',
     CANVAS_BACKGROUND : 'CANVAS_BACKGROUND',
@@ -17,6 +18,7 @@
     LAYER_OPACITY : 'LAYER_OPACITY',
     EXPORT_SCALE: 'EXPORT_SCALE',
     EXPORT_TAB: 'EXPORT_TAB',
+    EXPORT_GIF_REPEAT: 'EXPORT_GIF_REPEAT',
     PEN_SIZE : 'PEN_SIZE',
     RESIZE_SETTINGS: 'RESIZE_SETTINGS',
     COLOR_FORMAT: 'COLOR_FORMAT',
@@ -26,6 +28,7 @@
       'GRID_COLOR' : Constants.TRANSPARENT_COLOR,
       'GRID_ENABLED' : false,
       'GRID_WIDTH' : 1,
+      'GRID_SPACING' : 1,
       'MAX_FPS' : 24,
       'DEFAULT_SIZE' : {
         width : Constants.DEFAULT.WIDTH,
@@ -41,6 +44,7 @@
       'LAYER_PREVIEW' : true,
       'EXPORT_SCALE' : 1,
       'EXPORT_TAB' : 'gif',
+      'EXPORT_GIF_REPEAT' : true,
       'PEN_SIZE' : 1,
       'RESIZE_SETTINGS': {
         maintainRatio : true,
@@ -122,20 +126,4 @@
       }
     }
   };
-
-  // Migration script for version 11 to version 12. Initialize the GRID_ENABLED pref from
-  // the current GRID_WIDTH and update the stored grid width to 1 if it was set to 0.
-  // SHOULD BE REMOVED FOR RELEASE 13.
-  ns.UserSettings.migrate_to_v0_12 = function () {
-    var storedGridEnabled = ns.UserSettings.readFromLocalStorage_('GRID_ENABLED');
-    if (typeof storedGridEnabled === 'undefined' || storedGridEnabled === null) {
-      var gridWidth = ns.UserSettings.get('GRID_WIDTH');
-      ns.UserSettings.writeToLocalStorage_('GRID_ENABLED', gridWidth > 0);
-    }
-
-    var storedGridWidth = ns.UserSettings.readFromLocalStorage_('GRID_WIDTH');
-    if (storedGridWidth === 0) {
-      ns.UserSettings.writeToLocalStorage_('GRID_WIDTH', 1);
-    }
-  };
 })();

src/js/utils/serialization/Deserializer.js

@@ -36,6 +36,7 @@
 
     var descriptor = new pskl.model.piskel.Descriptor(name, description);
     this.piskel_ = new pskl.model.Piskel(piskelData.width, piskelData.height, piskelData.fps, descriptor);
+    this.hiddenFrames = piskelData.hiddenFrames || [];
 
     this.layersToLoad_ = piskelData.layers.length;
     piskelData.layers.forEach(this.deserializeLayer.bind(this));
@@ -73,7 +74,9 @@
       image.src = chunk.base64PNG;
       return deferred.promise;
     })).then(function () {
-      frames.forEach(layer.addFrame.bind(layer));
+      frames.forEach(function (frame) {
+        layer.addFrame(frame);
+      });
       this.layers_[index] = layer;
       this.onLayerLoaded_();
     }.bind(this)).catch(function (error) {
@@ -90,6 +93,7 @@
       this.layers_.forEach(function (layer) {
         this.piskel_.addLayer(layer);
       }.bind(this));
+      this.piskel_.hiddenFrames = this.hiddenFrames;
       this.callback_(this.piskel_);
     }
   };

src/js/utils/serialization/Serializer.js

@@ -21,6 +21,7 @@
       var serializedLayers = piskel.getLayers().map(function (l) {
         return pskl.utils.serialization.Serializer.serializeLayer(l);
       });
+
       return JSON.stringify({
         modelVersion : Constants.MODEL_VERSION,
         piskel : {
@@ -29,7 +30,8 @@
           fps : pskl.app.piskelController.getFPS(),
           height : piskel.getHeight(),
           width : piskel.getWidth(),
-          layers : serializedLayers
+          layers : serializedLayers,
+          hiddenFrames : piskel.hiddenFrames,
         }
       });
     },

src/js/utils/serialization/arraybuffer/ArrayBufferDeserializer.js

@@ -36,23 +36,36 @@
       // Layers meta
       var layerCount = arr16[6];
 
+      // Layers meta
+      var serializedHiddenFramesLength = arr16[7];
+
+      var currentIndex = 8;
       /********/
       /* DATA */
       /********/
       // Descriptor name
       var descriptorName = '';
       for (i = 0; i < descriptorNameLength; i++) {
-        descriptorName += String.fromCharCode(arr16[7 + i]);
+        descriptorName += String.fromCharCode(arr16[currentIndex + i]);
       }
+      currentIndex += descriptorNameLength;
 
       // Descriptor description
       var descriptorDescription = '';
       for (i = 0; i < descriptorDescriptionLength; i++) {
-        descriptorDescription = String.fromCharCode(arr16[7 + descriptorNameLength + i]);
+        descriptorDescription = String.fromCharCode(arr16[8 + descriptorNameLength + i]);
       }
+      currentIndex += descriptorDescriptionLength;
+
+      // Hidden frames
+      var serializedHiddenFrames = '';
+      for (i = 0; i < serializedHiddenFramesLength; i++) {
+        serializedHiddenFrames = String.fromCharCode(arr16[8 + descriptorNameLength + i]);
+      }
+      var hiddenFrames = serializedHiddenFrames.split('-');
+      currentIndex += serializedHiddenFramesLength;
 
       // Layers
-      var layerStartIndex = 7 + descriptorNameLength + descriptorDescriptionLength;
       var layers = [];
       var layer;
       for (i = 0; i < layerCount; i++) {
@@ -60,27 +73,27 @@
         var frames = [];
 
         // Meta
-        var layerNameLength = arr16[layerStartIndex];
+        var layerNameLength = arr16[currentIndex];
-        var opacity =  arr16[layerStartIndex + 1] / 65535;
+        var opacity =  arr16[currentIndex + 1] / 65535;
-        var frameCount = arr16[layerStartIndex + 2];
+        var frameCount = arr16[currentIndex + 2];
-        var dataUriLengthFirstHalf = arr16[layerStartIndex + 3];
+        var dataUriLengthFirstHalf = arr16[currentIndex + 3];
-        var dataUriLengthSecondHalf = arr16[layerStartIndex + 4];
+        var dataUriLengthSecondHalf = arr16[currentIndex + 4];
         var dataUriLength = (dataUriLengthSecondHalf >>> 0) | (dataUriLengthFirstHalf << 16 >>> 0);
 
         // Name
         var layerName = '';
         for (j = 0; j < layerNameLength; j++) {
-          layerName += String.fromCharCode(arr16[layerStartIndex + 5 + j]);
+          layerName += String.fromCharCode(arr16[currentIndex + 5 + j]);
         }
 
         // Data URI
         var dataUri = '';
         for (j = 0; j < dataUriLength; j++) {
-          dataUri += String.fromCharCode(arr8[(layerStartIndex + 5 + layerNameLength) * 2 + j]);
+          dataUri += String.fromCharCode(arr8[(currentIndex + 5 + layerNameLength) * 2 + j]);
         }
         dataUri = 'data:image/png;base64,' + dataUri;
 
-        layerStartIndex += Math.ceil(5 + layerNameLength + (dataUriLength / 2));
+        currentIndex += Math.ceil(5 + layerNameLength + (dataUriLength / 2));
 
         layer.name = layerName;
         layer.opacity = opacity;
@@ -91,6 +104,7 @@
 
       var descriptor = new pskl.model.piskel.Descriptor(descriptorName, descriptorDescription);
       var piskel = new pskl.model.Piskel(width, height, fps, descriptor);
+      piskel.hiddenFrames = hiddenFrames;
       var loadedLayers = 0;
 
       var loadLayerImage = function(layer, cb) {

src/js/utils/serialization/arraybuffer/ArrayBufferSerializer.js

@@ -101,7 +101,15 @@
         framesData.push({uri: dataUri, length: dataUriLength});
       }
 
-      var bytes = ns.ArrayBufferSerializer.calculateRequiredBytes(piskel, framesData);
+      var frames = pskl.app.piskelController.getLayerAt(0).getFrames();
+      var hiddenFrames = piskel.hiddenFrames;
+      var serializedHiddenFrames = hiddenFrames.join('-');
+
+      var bytes = ns.ArrayBufferSerializer.calculateRequiredBytes(
+        piskel,
+        framesData,
+        serializedHiddenFrames
+      );
 
       var buffer = new ArrayBuffer(bytes);
       var arr8 = new Uint8Array(buffer);
@@ -130,21 +138,33 @@
       // Layers meta
       arr16[6] = piskel.getLayers().length;
 
+      // Frames meta
+      arr16[7] = serializedHiddenFrames.length;
+
+      var currentIndex = 8;
+
       /********/
       /* DATA */
       /********/
       // Descriptor name
       for (i = 0; i < descriptorNameLength; i++) {
-        arr16[7 + i] = descriptorName.charCodeAt(i);
+        arr16[currentIndex + i] = descriptorName.charCodeAt(i);
       }
+      currentIndex = currentIndex + descriptorNameLength;
 
       // Descriptor description
       for (i = 0; i < descriptorDescriptionLength; i++) {
-        arr16[7 + descriptorNameLength + i] = descriptorDescription.charCodeAt(i);
+        arr16[currentIndex + i] = descriptorDescription.charCodeAt(i);
       }
+      currentIndex = currentIndex + descriptorDescriptionLength;
+
+      // Hidden frames
+      for (i = 0; i < serializedHiddenFrames.length; i++) {
+        arr16[currentIndex + i] = serializedHiddenFrames.charCodeAt(i);
+      }
+      currentIndex = currentIndex + serializedHiddenFrames.length;
 
       // Layers
-      var layerStartIndex = 7 + descriptorNameLength + descriptorDescriptionLength;
       for (i = 0, layers = piskel.getLayers(); i < layers.length; i++) {
         var layer = layers[i];
         var frames = layer.getFrames();
@@ -158,23 +178,23 @@
         dataUriLength = framesData[i].length;
 
         // Meta
-        arr16[layerStartIndex] = layerNameLength;
+        arr16[currentIndex] = layerNameLength;
-        arr16[layerStartIndex + 1] = Math.floor(opacity * 65535);
+        arr16[currentIndex + 1] = Math.floor(opacity * 65535);
-        arr16[layerStartIndex + 2] = frameCount;
+        arr16[currentIndex + 2] = frameCount;
-        arr16[layerStartIndex + 3] = ((dataUriLength & 0xffff0000) >> 16) >>> 0; // Upper 16
+        arr16[currentIndex + 3] = ((dataUriLength & 0xffff0000) >> 16) >>> 0; // Upper 16
-        arr16[layerStartIndex + 4] = ((dataUriLength & 0x0000ffff)) >>> 0;       // Lower 16
+        arr16[currentIndex + 4] = ((dataUriLength & 0x0000ffff)) >>> 0;       // Lower 16
 
         // Name
         for (j = 0; j < layerNameLength; j++) {
-          arr16[layerStartIndex + 5 + j] = layerName.charCodeAt(j);
+          arr16[currentIndex + 5 + j] = layerName.charCodeAt(j);
         }
 
         // Data URI
         for (j = 0; j < dataUriLength; j++) {
-          arr8[(layerStartIndex + 5 + layerNameLength) * 2 + j] = dataUri.charCodeAt(j);
+          arr8[(currentIndex + 5 + layerNameLength) * 2 + j] = dataUri.charCodeAt(j);
         }
 
-        layerStartIndex += Math.ceil(5 + layerNameLength + (dataUriLength / 2));
+        currentIndex += Math.ceil(5 + layerNameLength + (dataUriLength / 2));
       }
 
       return buffer;

src/js/widgets/ColorsList.js

@@ -139,7 +139,8 @@
     var colorElement = drop.item.get(0);
 
     var oldIndex = parseInt(colorElement.dataset.paletteIndex, 10);
-    var newIndex = $('.create-palette-color').index(drop.item);
+    var colors = document.querySelectorAll('.create-palette-color');
+    var newIndex = Array.prototype.indexOf.call(colors, colorElement);
     this.palette.move(oldIndex, newIndex);
 
     this.selectedIndex = newIndex;

src/js/widgets/SizePicker.js

@@ -27,10 +27,9 @@
     pskl.utils.Dom.removeClass('labeled', this.container);
     pskl.utils.Dom.removeClass('selected', this.container);
     var selectedOption;
-    if (size <= 4) {
     selectedOption = this.container.querySelector('[data-size="' + size + '"]');
-    } else {
+    if (!selectedOption) {
-      selectedOption = this.container.querySelector('[data-size="4"]');
+      selectedOption = this.container.querySelector('[data-size]:last-child');
       selectedOption.classList.add('labeled');
       selectedOption.setAttribute('real-size', size);
     }

src/piskel-boot.js

@@ -68,12 +68,21 @@
     };
     loadScript('piskel-script-list.js', 'loadNextScript()');
 
+    var styles;
     window.loadStyles = function () {
-      var styles = window.pskl_exports.styles;
+      styles = window.pskl_exports.styles;
       for (var i = 0 ; i < styles.length ; i++) {
         loadStyle(styles[i]);
       }
     };
+
+    window.reloadStyles = function () {
+      for (var i = 0 ; i < styles.length ; i++) {
+        document.querySelector('link[href="' + styles[i] + '"]').remove();
+        loadStyle(styles[i]);
+      }
+    };
+
     loadScript('piskel-style-list.js', 'loadStyles()');
   } else {
     var script;

src/piskel-script-list.js

@@ -79,6 +79,11 @@
   "js/model/Palette.js",
   "js/model/Piskel.js",
 
+  // Database (IndexedDB)
+  "js/database/BackupDatabase.js",
+  "js/database/PiskelDatabase.js",
+  "js/database/migrate/MigrateLocalStorageToIndexedDb.js",
+
   // Selection
   "js/selection/SelectionManager.js",
   "js/selection/BaseSelection.js",
@@ -108,6 +113,7 @@
   "js/controller/HeaderController.js",
   "js/controller/LayersListController.js",
   "js/controller/preview/PopupPreviewController.js",
+  "js/controller/preview/PreviewActionsController.js",
   "js/controller/preview/PreviewController.js",
   "js/controller/MinimapController.js",
   "js/controller/ToolController.js",
@@ -144,6 +150,9 @@
   "js/controller/dialogs/CreatePaletteController.js",
   "js/controller/dialogs/BrowseLocalController.js",
   "js/controller/dialogs/CheatsheetController.js",
+  "js/controller/dialogs/backups/steps/SelectSession.js",
+  "js/controller/dialogs/backups/steps/SessionDetails.js",
+  "js/controller/dialogs/backups/BrowseBackups.js",
   "js/controller/dialogs/importwizard/steps/AbstractImportStep.js",
   "js/controller/dialogs/importwizard/steps/AdjustSize.js",
   "js/controller/dialogs/importwizard/steps/ImageImport.js",
@@ -170,6 +179,7 @@
   // Services
   "js/service/storage/StorageService.js",
   "js/service/storage/FileDownloadStorageService.js",
+  "js/service/storage/IndexedDbStorageService.js",
   "js/service/storage/LocalStorageService.js",
   "js/service/storage/GalleryStorageService.js",
   "js/service/storage/DesktopStorageService.js",
@@ -195,15 +205,13 @@
   "js/service/keyboard/ShortcutService.js",
   "js/service/ImportService.js",
   "js/service/ImageUploadService.js",
+  "js/service/ClipboardService.js",
   "js/service/CurrentColorsService.js",
   "js/service/FileDropperService.js",
   "js/service/SelectedColorsService.js",
   "js/service/MouseStateService.js",
   "js/service/performance/PerformanceReport.js",
   "js/service/performance/PerformanceReportService.js",
-  "js/service/storage/LocalStorageService.js",
-  "js/service/storage/GalleryStorageService.js",
-  "js/service/storage/DesktopStorageService.js",
 
   // Tools
   "js/tools/ToolsHelper.js",

src/piskel-style-list.js

@@ -18,6 +18,7 @@
   "css/icons.css",
   "css/color-picker-slider.css",
   "css/dialogs.css",
+  "css/dialogs-browse-backups.css",
   "css/dialogs-browse-local.css",
   "css/dialogs-cheatsheet.css",
   "css/dialogs-create-palette.css",

src/templates/data-uri-export.html

@@ -0,0 +1,70 @@
+<div style="display:none">
+  <script type="text/template" id="data-uri-export-partial">
+    <style>
+      html, body {
+        margin: 0;
+      }
+
+      body {
+        background: #444;
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+        justify-content: center;
+        font-family: monospace;
+      }
+
+      #image-wrapper {
+        flex-grow: 1;
+        flex-shrink: 0;
+        display: flex;
+        flex-direction: column;
+        justify-content: center;
+      }
+
+      img {
+        background: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAABlBMVEXf39////8zI3BgAAAAHklEQVR4AWNghAIGCMDgjwgFCDDSw2M0PSCD0fQAACRcAgF4ciGUAAAAAElFTkSuQmCC') repeat;
+      }
+
+      #bottom-wrapper {
+        width: 600px;
+        height: 300px;
+        margin-top: 20px;
+        position: relative;
+        flex-shrink: 0;
+      }
+
+      textarea {
+        position: absolute;
+        bottom: 0;
+        width: 100%;
+        height: 100%;
+        padding: 10px;
+        border-style: none;
+
+        background: black;
+        color: gold;
+        font-family: monospace;
+      }
+
+      span {
+        position: absolute;
+        bottom: 10px;
+        left: 10px;
+        font-size: 12px;
+        padding: 5px;
+        color: white;
+        background-color: #444;
+      }
+    </style>
+    <body>
+      <div id="image-wrapper">
+        <img src="{{src}}" alt="Exported image as data-uri">
+      </div>
+      <div id="bottom-wrapper">
+        <textarea spellcheck="false" onclick="this.select()">{{src}}</textarea>
+        <span>Data-uri for the exported framesheet</span>
+      </div>
+    </body>
+  </script>
+</div>