/*
html2canvas @VERSION@ <http://html2canvas.hertzen.com>
Copyright (c) 2011 Niklas von Hertzen. All rights reserved.
http://www.twitter.com/niklasvh
Released under MIT License
*/
html2canvas.Renderer = function(parseQueue, opts){
var options = {
"width": null,
"height": null,
"renderer": "canvas"
},
queue = [],
canvas,
usingFlashcanvas = false,
flashMaxSize = 2880, // flash bitmap limited to 2880x2880px // http://stackoverflow.com/questions/2033792/argumenterror-error-2015-invalid-bitmapdata
doc = document;
options = html2canvas.Util.Extend(opts, options);
function sortZ(zStack){
var subStacks = [],
stackValues = [],
zStackChildren = zStack.children,
s,
i,
stackLen,
zValue,
zLen,
stackChild,
b,
subStackLen;
for (s = 0, zLen = zStackChildren.length; s < zLen; s+=1){
stackChild = zStackChildren[s];
if (stackChild.children && stackChild.children.length > 0){
subStacks.push(stackChild);
stackValues.push(stackChild.zindex);
}else{
queue.push(stackChild);
}
}
stackValues.sort(function(a, b) {
return a - b;
});
for (i = 0, stackLen = stackValues.length; i < stackLen; i+=1){
zValue = stackValues[i];
for (b = 0, subStackLen = subStacks.length; b <= subStackLen; b+=1){
if (subStacks[b].zindex === zValue){
stackChild = subStacks.splice(b, 1);
sortZ(stackChild[0]);
break;
}
}
}
}
function canvasRenderer(zStack){
sortZ(zStack.zIndex);
var ctx = canvas.getContext("2d"),
storageContext,
i,
queueLen,
a,
newCanvas,
bounds,
storageLen,
renderItem,
fstyle;
canvas.width = canvas.style.width = (!usingFlashcanvas) ? options.width || zStack.ctx.width : Math.min(flashMaxSize, (options.width || zStack.ctx.width) );
canvas.height = canvas.style.height = (!usingFlashcanvas) ? options.height || zStack.ctx.height : Math.min(flashMaxSize, (options.height || zStack.ctx.height) );
fstyle = ctx.fillStyle;
ctx.fillStyle = "#fff";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = fstyle;
for (i = 0, queueLen = queue.length; i < queueLen; i+=1){
storageContext = queue.splice(0, 1)[0];
storageContext.canvasPosition = storageContext.canvasPosition || {};
//this.canvasRenderContext(storageContext,parentctx);
// set common settings for canvas
ctx.textBaseline = "bottom";
if (storageContext.clip){
ctx.save();
ctx.beginPath();
// console.log(storageContext);
ctx.rect(storageContext.clip.left, storageContext.clip.top, storageContext.clip.width, storageContext.clip.height);
ctx.clip();
}
if (storageContext.ctx.storage){
for (a = 0, storageLen = storageContext.ctx.storage.length; a < storageLen; a+=1){
renderItem = storageContext.ctx.storage[a];
switch(renderItem.type){
case "variable":
ctx[renderItem.name] = renderItem['arguments'];
break;
case "function":
if (renderItem.name === "fillRect") {
if (!usingFlashcanvas || renderItem['arguments'][0] + renderItem['arguments'][2] < flashMaxSize && renderItem['arguments'][1] + renderItem['arguments'][3] < flashMaxSize) {
ctx.fillRect(
renderItem['arguments'][0],
renderItem['arguments'][1],
renderItem['arguments'][2],
renderItem['arguments'][3]
);
}
}else if(renderItem.name === "fillText") {
if (!usingFlashcanvas || renderItem['arguments'][1] < flashMaxSize && renderItem['arguments'][2] < flashMaxSize) {
ctx.fillText(
renderItem['arguments'][0],
renderItem['arguments'][1],
renderItem['arguments'][2]
);
}
}else if(renderItem.name === "drawImage") {
if (renderItem['arguments'][8] > 0 && renderItem['arguments'][7]){
ctx.drawImage(
renderItem['arguments'][0],
renderItem['arguments'][1],
renderItem['arguments'][2],
renderItem['arguments'][3],
renderItem['arguments'][4],
renderItem['arguments'][5],
renderItem['arguments'][6],
renderItem['arguments'][7],
renderItem['arguments'][8]
);
}
}
break;
default:
}
}
}
if (storageContext.clip){
ctx.restore();
}
}
h2clog("html2canvas: Renderer: Canvas renderer done - returning canvas obj");
// this.canvasRenderStorage(queue,this.ctx);
queueLen = options.elements.length;
if (queueLen === 1) {
if (typeof options.elements[ 0 ] === "object" && options.elements[ 0 ].nodeName !== "BODY" && usingFlashcanvas === false) {
// crop image to the bounds of selected (single) element
bounds = html2canvas.Util.Bounds( options.elements[ 0 ] );
newCanvas = doc.createElement('canvas');
newCanvas.width = bounds.width;
newCanvas.height = bounds.height;
ctx = newCanvas.getContext("2d");
ctx.drawImage( canvas, bounds.left, bounds.top, bounds.width, bounds.height, 0, 0, bounds.width, bounds.height );
delete canvas;
return newCanvas;
}
} else {
// TODO clip and resize multiple elements
/*
for ( i = 0; i < queueLen; i+=1 ) {
if (options.elements[ i ] instanceof Element) {
}
}*/
}
return canvas;
}
function svgRenderer(zStack){
sortZ(zStack.zIndex);
var svgNS = "http://www.w3.org/2000/svg",
svg = doc.createElementNS(svgNS, "svg"),
xlinkNS = "http://www.w3.org/1999/xlink",
defs = doc.createElementNS(svgNS, "defs"),
i,
a,
queueLen,
storageLen,
storageContext,
renderItem,
el,
settings = {},
text,
fontStyle,
clipId = 0;
svg.setAttribute("version", "1.1");
svg.setAttribute("baseProfile", "full");
svg.setAttribute("viewBox", "0 0 " + Math.max(zStack.ctx.width, options.width) + " " + Math.max(zStack.ctx.height, options.height));
svg.setAttribute("width", Math.max(zStack.ctx.width, options.width) + "px");
svg.setAttribute("height", Math.max(zStack.ctx.height, options.height) + "px");
svg.setAttribute("preserveAspectRatio", "none");
svg.appendChild(defs);
for (i = 0, queueLen = queue.length; i < queueLen; i+=1){
storageContext = queue.splice(0, 1)[0];
storageContext.canvasPosition = storageContext.canvasPosition || {};
//this.canvasRenderContext(storageContext,parentctx);
/*
if (storageContext.clip){
ctx.save();
ctx.beginPath();
// console.log(storageContext);
ctx.rect(storageContext.clip.left, storageContext.clip.top, storageContext.clip.width, storageContext.clip.height);
ctx.clip();
}*/
if (storageContext.ctx.storage){
for (a = 0, storageLen = storageContext.ctx.storage.length; a < storageLen; a+=1){
renderItem = storageContext.ctx.storage[a];
switch(renderItem.type){
case "variable":
settings[renderItem.name] = renderItem['arguments'];
break;
case "function":
if (renderItem.name === "fillRect") {
el = doc.createElementNS(svgNS, "rect");
el.setAttribute("x", renderItem['arguments'][0]);
el.setAttribute("y", renderItem['arguments'][1]);
el.setAttribute("width", renderItem['arguments'][2]);
el.setAttribute("height", renderItem['arguments'][3]);
el.setAttribute("fill", settings.fillStyle);
svg.appendChild(el);
} else if(renderItem.name === "fillText") {
el = doc.createElementNS(svgNS, "text");
fontStyle = settings.font.split(" ");
el.style.fontVariant = fontStyle.splice(0, 1)[0];
el.style.fontWeight = fontStyle.splice(0, 1)[0];
el.style.fontStyle = fontStyle.splice(0, 1)[0];
el.style.fontSize = fontStyle.splice(0, 1)[0];
el.setAttribute("x", renderItem['arguments'][1]);
el.setAttribute("y", renderItem['arguments'][2] - (parseInt(el.style.fontSize, 10) + 3));
el.setAttribute("fill", settings.fillStyle);
// TODO get proper baseline
el.style.dominantBaseline = "text-before-edge";
el.style.fontFamily = fontStyle.join(" ");
text = doc.createTextNode(renderItem['arguments'][0]);
el.appendChild(text);
svg.appendChild(el);
} else if(renderItem.name === "drawImage") {
if (renderItem['arguments'][8] > 0 && renderItem['arguments'][7]){
// TODO check whether even any clipping is necessary for this particular image
el = doc.createElementNS(svgNS, "clipPath");
el.setAttribute("id", "clipId" + clipId);
text = doc.createElementNS(svgNS, "rect");
text.setAttribute("x", renderItem['arguments'][5] );
text.setAttribute("y", renderItem['arguments'][6]);
text.setAttribute("width", renderItem['arguments'][3]);
text.setAttribute("height", renderItem['arguments'][4]);
el.appendChild(text);
defs.appendChild(el);
el = doc.createElementNS(svgNS, "image");
el.setAttributeNS(xlinkNS, "xlink:href", renderItem['arguments'][0].src);
el.setAttribute("width", renderItem['arguments'][0].width);
el.setAttribute("height", renderItem['arguments'][0].height);
el.setAttribute("x", renderItem['arguments'][5] - renderItem['arguments'][1]);
el.setAttribute("y", renderItem['arguments'][6] - renderItem['arguments'][2]);
el.setAttribute("clip-path", "url(#clipId" + clipId + ")");
// el.setAttribute("xlink:href", );
el.setAttribute("preserveAspectRatio", "none");
svg.appendChild(el);
clipId += 1;
/*
ctx.drawImage(
renderItem['arguments'][0],
renderItem['arguments'][1],
renderItem['arguments'][2],
renderItem['arguments'][3],
renderItem['arguments'][4],
renderItem['arguments'][5],
renderItem['arguments'][6],
renderItem['arguments'][7],
renderItem['arguments'][8]
);
*/
}
}
break;
default:
}
}
}
/*
if (storageContext.clip){
ctx.restore();
}
*/
}
h2clog("html2canvas: Renderer: SVG Renderer done - returning SVG DOM obj");
return svg;
}
//this.each(this.opts.renderOrder.split(" "),function(i,renderer){
//options.renderer = "svg";
switch(options.renderer.toLowerCase()){
case "canvas":
canvas = doc.createElement('canvas');
if (canvas.getContext){
h2clog("html2canvas: Renderer: using canvas renderer");
return canvasRenderer(parseQueue);
} else {
usingFlashcanvas = true;
h2clog("html2canvas: Renderer: canvas not available, using flashcanvas");
var script = doc.createElement("script");
script.src = options.flashcanvas;
script.onload = (function(script, func){
var intervalFunc;
if (script.onload === undefined) {
// IE lack of support for script onload
if( script.onreadystatechange !== undefined ) {
intervalFunc = function() {
if (script.readyState !== "loaded" && script.readyState !== "complete") {
window.setTimeout( intervalFunc, 250 );
} else {
// it is loaded
func();
}
};
window.setTimeout( intervalFunc, 250 );
} else {
h2clog("html2canvas: Renderer: Can't track when flashcanvas is loaded");
}
} else {
return func;
}
})(script, function(){
if (typeof FlashCanvas !== "undefined") {
h2clog("html2canvas: Renderer: Flashcanvas initialized");
FlashCanvas.initElement( canvas );
canvasRenderer(parseQueue);
}
});
doc.body.appendChild( script );
return canvas;
}
break;
case "svg":
if (doc.createElementNS){
h2clog("html2canvas: Renderer: using SVG renderer");
return svgRenderer(parseQueue);
}
break;
}
//});
return this;
};