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Niklas von Hertzen
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226
src/renderers/Canvas.js
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226
src/renderers/Canvas.js
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/*
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html2canvas @VERSION@ <http://html2canvas.hertzen.com>
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Copyright (c) 2011 Niklas von Hertzen. All rights reserved.
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http://www.twitter.com/niklasvh
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Released under MIT License
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*/
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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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if (canvas.getContext){
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html2canvas.log("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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html2canvas.log("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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html2canvas.log("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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html2canvas.log("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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});
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doc.body.appendChild( script );
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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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}
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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;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.fillStyle = fstyle;
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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 === "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]){
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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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}
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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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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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}
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}
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return methods;
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};
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