mirror of
https://github.com/niklasvh/html2canvas.git
synced 2023-08-10 21:13:10 +03:00
refactored renderer
This commit is contained in:
Niklas von Hertzen
parent
7d7deca342
commit
a313524aa4
src
@ -22,7 +22,7 @@ _html2canvas.Renderer = function(parseQueue, options){
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stackValues.forEach(function(zValue) {
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var index;
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subStacks.some(function(stack, i){
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index = i;
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return (stack.zindex === zValue);
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@ -48,11 +48,11 @@ _html2canvas.Renderer = function(parseQueue, options){
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throw new Error("Unknown renderer");
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}
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if ( typeof renderer._create !== "function" ) {
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if ( typeof renderer !== "function" ) {
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throw new Error("Invalid renderer defined");
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}
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return renderer;
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}
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return getRenderer(options.renderer)._create(parseQueue, options, document, createRenderQueue(parseQueue), _html2canvas);
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return getRenderer(options.renderer)(parseQueue, options, document, createRenderQueue(parseQueue), _html2canvas);
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};
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@ -5,6 +5,7 @@ window.html2canvas = function(elements, opts) {
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// general
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logging: false,
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elements: elements,
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background: "#fff",
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// preload options
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proxy: "",
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@ -1,233 +1,138 @@
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_html2canvas.Renderer.Canvas = function( options ) {
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_html2canvas.Renderer.Canvas = function(options) {
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options = options || {};
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var doc = document,
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canvas = options.canvas || doc.createElement('canvas'),
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usingFlashcanvas = false,
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_createCalled = false,
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canvasReadyToDraw = false,
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methods,
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flashMaxSize = 2880; // flash bitmap limited to 2880x2880px // http://stackoverflow.com/questions/2033792/argumenterror-error-2015-invalid-bitmapdata
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safeImages = [],
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testCanvas = document.createElement("canvas"),
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testctx = testCanvas.getContext("2d"),
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canvas = options.canvas || doc.createElement('canvas');
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if (canvas.getContext){
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h2clog("html2canvas: Renderer: using canvas renderer");
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canvasReadyToDraw = true;
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} else if ( options.flashcanvas !== undefined ){
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usingFlashcanvas = true;
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h2clog("html2canvas: Renderer: canvas not available, using flashcanvas");
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var script = doc.createElement("script");
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script.src = options.flashcanvas;
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script.onload = (function(script, func){
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var intervalFunc;
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if (script.onload === undefined) {
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// IE lack of support for script onload
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if( script.onreadystatechange !== undefined ) {
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intervalFunc = function() {
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if (script.readyState !== "loaded" && script.readyState !== "complete") {
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window.setTimeout( intervalFunc, 250 );
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} else {
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// it is loaded
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func();
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}
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};
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window.setTimeout( intervalFunc, 250 );
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} else {
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h2clog("html2canvas: Renderer: Can't track when flashcanvas is loaded");
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}
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} else {
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return func;
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}
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})(script, function(){
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if (typeof window.FlashCanvas !== "undefined") {
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h2clog("html2canvas: Renderer: Flashcanvas initialized");
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window.FlashCanvas.initElement( canvas );
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canvasReadyToDraw = true;
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if ( _createCalled !== false ) {
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methods._create.apply( null, _createCalled );
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}
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}
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function createShape(ctx, args) {
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ctx.beginPath();
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args.forEach(function(arg) {
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ctx[arg.name].apply(ctx, arg['arguments']);
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});
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doc.body.appendChild( script );
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ctx.closePath();
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}
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methods = {
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_create: function( zStack, options, doc, queue, _html2canvas ) {
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if ( !canvasReadyToDraw ) {
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_createCalled = arguments;
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return canvas;
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function safeImage(item) {
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if (safeImages.indexOf(item['arguments'][0].src ) === -1) {
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testctx.drawImage(item['arguments'][0], 0, 0);
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try {
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testctx.getImageData(0, 0, 1, 1);
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} catch(e) {
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testCanvas = doc.createElement("canvas");
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testctx = testCanvas.getContext("2d");
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return false;
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}
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var ctx = canvas.getContext("2d"),
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storageContext,
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i,
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queueLen,
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a,
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newCanvas,
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bounds,
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testCanvas = document.createElement("canvas"),
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hasCTX = ( testCanvas.getContext !== undefined ),
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storageLen,
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renderItem,
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testctx = ( hasCTX ) ? testCanvas.getContext("2d") : {},
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safeImages = [],
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fstyle;
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canvas.width = canvas.style.width = (!usingFlashcanvas) ? options.width || zStack.ctx.width : Math.min(flashMaxSize, (options.width || zStack.ctx.width) );
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canvas.height = canvas.style.height = (!usingFlashcanvas) ? options.height || zStack.ctx.height : Math.min(flashMaxSize, (options.height || zStack.ctx.height) );
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fstyle = ctx.fillStyle;
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ctx.fillStyle = (zStack.backgroundColor === "transparent" || zStack.backgroundColor === "rgba(0, 0, 0, 0)") ? "#fff" : zStack.backgroundColor;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.fillStyle = fstyle;
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var createShape = function(args) {
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ctx.beginPath();
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args.forEach(function(arg) {
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ctx[arg.name].apply(ctx, arg['arguments']);
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});
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ctx.closePath();
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};
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if ( options.svgRendering && zStack.svgRender !== undefined ) {
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// TODO: enable async rendering to support this
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ctx.drawImage( zStack.svgRender, 0, 0 );
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} else {
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for ( i = 0, queueLen = queue.length; i < queueLen; i+=1 ) {
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storageContext = queue.splice(0, 1)[0];
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storageContext.canvasPosition = storageContext.canvasPosition || {};
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//this.canvasRenderContext(storageContext,parentctx);
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// set common settings for canvas
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ctx.textBaseline = "bottom";
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if (storageContext.clip){
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ctx.save();
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ctx.beginPath();
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// console.log(storageContext);
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ctx.rect(storageContext.clip.left, storageContext.clip.top, storageContext.clip.width, storageContext.clip.height);
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ctx.clip();
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}
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if (storageContext.ctx.storage){
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for (a = 0, storageLen = storageContext.ctx.storage.length; a < storageLen; a+=1){
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renderItem = storageContext.ctx.storage[a];
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switch(renderItem.type){
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case "variable":
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ctx[renderItem.name] = renderItem['arguments'];
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break;
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case "function":
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if (renderItem.name === "fillRect") {
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if (!usingFlashcanvas || renderItem['arguments'][0] + renderItem['arguments'][2] < flashMaxSize && renderItem['arguments'][1] + renderItem['arguments'][3] < flashMaxSize) {
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ctx.fillRect.apply( ctx, renderItem['arguments'] );
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}
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} else if (renderItem.name === "createPattern") {
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ctx.fillStyle = ctx.createPattern(renderItem['arguments'][0], "repeat");
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} else if (renderItem.name === "drawShape") {
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createShape(renderItem['arguments']);
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} else if (renderItem.name === "fillText") {
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if (!usingFlashcanvas || renderItem['arguments'][1] < flashMaxSize && renderItem['arguments'][2] < flashMaxSize) {
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ctx.fillText.apply( ctx, renderItem['arguments'] );
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}
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} else if (renderItem.name === "drawImage") {
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if (renderItem['arguments'][8] > 0 && renderItem['arguments'][7] > 0) {
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if ( hasCTX && options.taintTest ) {
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if ( safeImages.indexOf( renderItem['arguments'][ 0 ].src ) === -1 ) {
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testctx.drawImage( renderItem['arguments'][ 0 ], 0, 0 );
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try {
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testctx.getImageData( 0, 0, 1, 1 );
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} catch(e) {
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testCanvas = doc.createElement("canvas");
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testctx = testCanvas.getContext("2d");
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continue;
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}
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safeImages.push( renderItem['arguments'][ 0 ].src );
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}
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}
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ctx.drawImage.apply( ctx, renderItem['arguments'] );
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}
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} else {
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ctx[renderItem.name].apply(ctx, renderItem['arguments']);
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}
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break;
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default:
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}
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}
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}
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if (storageContext.clip){
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ctx.restore();
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}
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}
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}
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h2clog("html2canvas: Renderer: Canvas renderer done - returning canvas obj");
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queueLen = options.elements.length;
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if (queueLen === 1) {
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if (typeof options.elements[ 0 ] === "object" && options.elements[ 0 ].nodeName !== "BODY" && usingFlashcanvas === false) {
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// crop image to the bounds of selected (single) element
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bounds = _html2canvas.Util.Bounds( options.elements[ 0 ] );
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newCanvas = doc.createElement('canvas');
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newCanvas.width = bounds.width;
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newCanvas.height = bounds.height;
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ctx = newCanvas.getContext("2d");
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ctx.drawImage( canvas, bounds.left, bounds.top, bounds.width, bounds.height, 0, 0, bounds.width, bounds.height );
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canvas = null;
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return newCanvas;
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}
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} /*else {
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// TODO clip and resize multiple elements
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for ( i = 0; i < queueLen; i+=1 ) {
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if (options.elements[ i ] instanceof Element) {
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}
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}
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}
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*/
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return canvas;
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safeImages.push(item['arguments'][0].src);
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}
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return true;
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}
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function isTransparent(backgroundColor) {
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return (backgroundColor === "transparent" || backgroundColor === "rgba(0, 0, 0, 0)");
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}
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function renderItem(ctx, item) {
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switch(item.type){
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case "variable":
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ctx[item.name] = item['arguments'];
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break;
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case "function":
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if (item.name === "createPattern") {
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if (item['arguments'][0].width > 0 && item['arguments'][0].height > 0) {
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try {
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ctx.fillStyle = ctx.createPattern(item['arguments'][0], "repeat");
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}
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catch(e) {
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h2clog("html2canvas: Renderer: Error creating pattern", e.message);
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}
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}
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} else if (item.name === "drawShape") {
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createShape(ctx, item['arguments']);
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} else if (item.name === "drawImage") {
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if (item['arguments'][8] > 0 && item['arguments'][7] > 0) {
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if (options.taintTest || (options.taintTest && safeImage(item))) {
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ctx.drawImage.apply( ctx, item['arguments'] );
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}
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}
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} else {
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ctx[item.name].apply(ctx, item['arguments']);
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}
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break;
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}
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}
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return function(zStack, options, doc, queue, _html2canvas) {
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var ctx = canvas.getContext("2d"),
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storageContext,
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i,
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queueLen,
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newCanvas,
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bounds,
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fstyle;
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canvas.width = canvas.style.width = options.width || zStack.ctx.width;
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canvas.height = canvas.style.height = options.height || zStack.ctx.height;
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fstyle = ctx.fillStyle;
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ctx.fillStyle = (isTransparent(zStack.backgroundColor) && options.background !== undefined) ? options.background : zStack.backgroundColor;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.fillStyle = fstyle;
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if ( options.svgRendering && zStack.svgRender !== undefined ) {
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// TODO: enable async rendering to support this
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ctx.drawImage( zStack.svgRender, 0, 0 );
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} else {
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for ( i = 0, queueLen = queue.length; i < queueLen; i+=1 ) {
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storageContext = queue.splice(0, 1)[0];
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storageContext.canvasPosition = storageContext.canvasPosition || {};
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// set common settings for canvas
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ctx.textBaseline = "bottom";
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if (storageContext.clip){
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ctx.save();
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ctx.beginPath();
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// console.log(storageContext);
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ctx.rect(storageContext.clip.left, storageContext.clip.top, storageContext.clip.width, storageContext.clip.height);
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ctx.clip();
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}
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if (storageContext.ctx.storage) {
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storageContext.ctx.storage.forEach(renderItem.bind(null, ctx));
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}
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if (storageContext.clip){
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ctx.restore();
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}
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}
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}
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h2clog("html2canvas: Renderer: Canvas renderer done - returning canvas obj");
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queueLen = options.elements.length;
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if (queueLen === 1) {
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if (typeof options.elements[0] === "object" && options.elements[0].nodeName !== "BODY") {
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// crop image to the bounds of selected (single) element
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bounds = _html2canvas.Util.Bounds(options.elements[0]);
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newCanvas = doc.createElement('canvas');
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newCanvas.width = bounds.width;
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newCanvas.height = bounds.height;
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ctx = newCanvas.getContext("2d");
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ctx.drawImage(canvas, bounds.left, bounds.top, bounds.width, bounds.height, 0, 0, bounds.width, bounds.height);
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canvas = null;
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return newCanvas;
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}
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}
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return canvas;
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};
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return methods;
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};
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