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This commit is contained in:
Julian Viereck 2011-09-09 18:14:42 -07:00
parent d639a9a94a
commit 9eb7858586
4 changed files with 18 additions and 735 deletions
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18
worker/boot_processor.js Normal file
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
'use strict';
importScripts('console.js');
importScripts('message_handler.js');
importScripts('../pdf.js');
importScripts('../fonts.js');
importScripts('../crypto.js');
importScripts('../glyphlist.js');
importScripts('handler.js');
// Listen for messages from the main thread.
var pdfDoc = null;
var handler = new MessageHandler("worker", this);
WorkerHandler.setup(handler);

252
worker/canvas.js
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
'use strict';
var JpegStreamProxyCounter = 0;
// WebWorker Proxy for JpegStream.
var JpegStreamProxy = (function() {
function constructor(bytes, dict) {
this.id = JpegStreamProxyCounter++;
this.dict = dict;
// Tell the main thread to create an image.
postMessage({
action: 'jpeg_stream',
data: {
id: this.id,
raw: bytesToString(bytes)
}
});
}
constructor.prototype = {
getImage: function() {
return this;
},
getChar: function() {
error('internal error: getChar is not valid on JpegStream');
}
};
return constructor;
})();
// Really simple GradientProxy. There is currently only one active gradient at
// the time, meaning you can't create a gradient, create a second one and then
// use the first one again. As this isn't used in pdf.js right now, it's okay.
function GradientProxy(cmdQueue, x0, y0, x1, y1) {
cmdQueue.push(['$createLinearGradient', [x0, y0, x1, y1]]);
this.addColorStop = function(i, rgba) {
cmdQueue.push(['$addColorStop', [i, rgba]]);
}
}
// Really simple PatternProxy.
var patternProxyCounter = 0;
function PatternProxy(cmdQueue, object, kind) {
this.id = patternProxyCounter++;
if (!(object instanceof CanvasProxy)) {
throw 'unkown type to createPattern';
}
// Flush the object here to ensure it's available on the main thread.
// TODO: Make some kind of dependency management, such that the object
// gets flushed only if needed.
object.flush();
cmdQueue.push(['$createPatternFromCanvas', [this.id, object.id, kind]]);
}
var canvasProxyCounter = 0;
function CanvasProxy(width, height) {
this.id = canvasProxyCounter++;
// The `stack` holds the rendering calls and gets flushed to the main thead.
var cmdQueue = this.cmdQueue = [];
// Dummy context that gets exposed.
var ctx = {};
this.getContext = function(type) {
if (type != '2d') {
throw 'CanvasProxy can only provide a 2d context.';
}
return ctx;
}
// Expose only the minimum of the canvas object - there is no dom to do
// more here.
this.width = width;
this.height = height;
ctx.canvas = this;
// Setup function calls to `ctx`.
var ctxFunc = [
'createRadialGradient',
'arcTo',
'arc',
'fillText',
'strokeText',
'createImageData',
'drawWindow',
'save',
'restore',
'scale',
'rotate',
'translate',
'transform',
'setTransform',
'clearRect',
'fillRect',
'strokeRect',
'beginPath',
'closePath',
'moveTo',
'lineTo',
'quadraticCurveTo',
'bezierCurveTo',
'rect',
'fill',
'stroke',
'clip',
'measureText',
'isPointInPath',
// These functions are necessary to track the rendering currentX state.
// The exact values can be computed on the main thread only, as the
// worker has no idea about text width.
'$setCurrentX',
'$addCurrentX',
'$saveCurrentX',
'$restoreCurrentX',
'$showText',
'$setFont'
];
function buildFuncCall(name) {
return function() {
// console.log("funcCall", name)
cmdQueue.push([name, Array.prototype.slice.call(arguments)]);
}
}
var name;
for (var i = 0; i < ctxFunc.length; i++) {
name = ctxFunc[i];
ctx[name] = buildFuncCall(name);
}
// Some function calls that need more work.
ctx.createPattern = function(object, kind) {
return new PatternProxy(cmdQueue, object, kind);
}
ctx.createLinearGradient = function(x0, y0, x1, y1) {
return new GradientProxy(cmdQueue, x0, y0, x1, y1);
}
ctx.getImageData = function(x, y, w, h) {
return {
width: w,
height: h,
data: Uint8ClampedArray(w * h * 4)
};
}
ctx.putImageData = function(data, x, y, width, height) {
cmdQueue.push(['$putImageData', [data, x, y, width, height]]);
}
ctx.drawImage = function(image, x, y, width, height,
sx, sy, swidth, sheight) {
if (image instanceof CanvasProxy) {
// Send the image/CanvasProxy to the main thread.
image.flush();
cmdQueue.push(['$drawCanvas', [image.id, x, y, sx, sy, swidth, sheight]]);
} else if (image instanceof JpegStreamProxy) {
cmdQueue.push(['$drawImage', [image.id, x, y, sx, sy, swidth, sheight]]);
} else {
throw 'unkown type to drawImage';
}
}
// Setup property access to `ctx`.
var ctxProp = {
// "canvas"
'globalAlpha': '1',
'globalCompositeOperation': 'source-over',
'strokeStyle': '#000000',
'fillStyle': '#000000',
'lineWidth': '1',
'lineCap': 'butt',
'lineJoin': 'miter',
'miterLimit': '10',
'shadowOffsetX': '0',
'shadowOffsetY': '0',
'shadowBlur': '0',
'shadowColor': 'rgba(0, 0, 0, 0)',
'font': '10px sans-serif',
'textAlign': 'start',
'textBaseline': 'alphabetic',
'mozTextStyle': '10px sans-serif',
'mozImageSmoothingEnabled': 'true'
};
function buildGetter(name) {
return function() {
return ctx['$' + name];
}
}
function buildSetter(name) {
return function(value) {
cmdQueue.push(['$', name, value]);
return ctx['$' + name] = value;
}
}
// Setting the value to `stroke|fillStyle` needs special handling, as it
// might gets an gradient/pattern.
function buildSetterStyle(name) {
return function(value) {
if (value instanceof GradientProxy) {
cmdQueue.push(['$' + name + 'Gradient']);
} else if (value instanceof PatternProxy) {
cmdQueue.push(['$' + name + 'Pattern', [value.id]]);
} else {
cmdQueue.push(['$', name, value]);
return ctx['$' + name] = value;
}
}
}
for (var name in ctxProp) {
ctx['$' + name] = ctxProp[name];
ctx.__defineGetter__(name, buildGetter(name));
// Special treatment for `fillStyle` and `strokeStyle`: The passed style
// might be a gradient. Need to check for that.
if (name == 'fillStyle' || name == 'strokeStyle') {
ctx.__defineSetter__(name, buildSetterStyle(name));
} else {
ctx.__defineSetter__(name, buildSetter(name));
}
}
}
/**
* Sends the current cmdQueue of the CanvasProxy over to the main thread and
* resets the cmdQueue.
*/
CanvasProxy.prototype.flush = function() {
postMessage({
action: 'canvas_proxy_cmd_queue',
data: {
id: this.id,
cmdQueue: this.cmdQueue,
width: this.width,
height: this.height
}
});
this.cmdQueue.length = 0;
};

417
worker/client.js
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
'use strict';
if (typeof console.time == 'undefined') {
var consoleTimer = {};
console.time = function(name) {
consoleTimer[name] = Date.now();
};
console.timeEnd = function(name) {
var time = consoleTimer[name];
if (time == null) {
throw 'Unkown timer name ' + name;
}
this.log('Timer:', name, Date.now() - time);
};
}
function FontWorker() {
this.worker = new Worker('worker/font.js');
this.fontsWaiting = 0;
this.fontsWaitingCallbacks = [];
// Listen to the WebWorker for data and call actionHandler on it.
this.worker.onmessage = function(event) {
var data = event.data;
var actionHandler = this.actionHandler;
if (data.action in actionHandler) {
actionHandler[data.action].call(this, data.data);
} else {
throw 'Unkown action from worker: ' + data.action;
}
}.bind(this);
this.$handleFontLoadedCallback = this.handleFontLoadedCallback.bind(this);
}
FontWorker.prototype = {
handleFontLoadedCallback: function() {
// Decrease the number of fonts wainting to be loaded.
this.fontsWaiting--;
// If all fonts are available now, then call all the callbacks.
if (this.fontsWaiting == 0) {
var callbacks = this.fontsWaitingCallbacks;
for (var i = 0; i < callbacks.length; i++) {
callbacks[i]();
}
this.fontsWaitingCallbacks.length = 0;
}
},
actionHandler: {
'log': function(data) {
console.log.apply(console, data);
},
'fonts': function(data) {
// console.log("got processed fonts from worker", Object.keys(data));
for (name in data) {
// Update the encoding property.
var font = Fonts.lookup(name);
font.properties = {
encoding: data[name].encoding
};
// Call `Font.prototype.bindDOM` to make the font get loaded
// on the page.
Font.prototype.bindDOM.call(
font,
data[name].str,
// IsLoadedCallback.
this.$handleFontLoadedCallback
);
}
}
},
ensureFonts: function(data, callback) {
var font;
var notLoaded = [];
for (var i = 0; i < data.length; i++) {
font = data[i];
if (Fonts[font.name]) {
continue;
}
// Register the font but don't pass in any real data. The idea is to
// store as less data as possible to reduce memory usage.
Fonts.registerFont(font.name, Object.create(null), Object.create(null));
// Mark this font to be handled later.
notLoaded.push(font);
// Increate the number of fonts to wait for.
this.fontsWaiting++;
}
console.time('ensureFonts');
// If there are fonts, that need to get loaded, tell the FontWorker to get
// started and push the callback on the waiting-callback-stack.
if (notLoaded.length != 0) {
console.log('fonts -> FontWorker');
// Send the worker the fonts to work on.
this.worker.postMessage({
action: 'fonts',
data: notLoaded
});
if (callback) {
this.fontsWaitingCallbacks.push(callback);
}
}
// All fonts are present? Well, then just call the callback if there is one.
else {
if (callback) {
callback();
}
}
}
};
function WorkerPDFDoc(canvas) {
var timer = null;
this.ctx = canvas.getContext('2d');
this.canvas = canvas;
this.worker = new Worker('worker/pdf.js');
this.fontWorker = new FontWorker();
this.waitingForFonts = false;
this.waitingForFontsCallback = [];
this.numPage = 1;
this.numPages = null;
var imagesList = {};
var canvasList = {
0: canvas
};
var patternList = {};
var gradient;
var currentX = 0;
var currentXStack = [];
var ctxSpecial = {
'$setCurrentX': function(value) {
currentX = value;
},
'$addCurrentX': function(value) {
currentX += value;
},
'$saveCurrentX': function() {
currentXStack.push(currentX);
},
'$restoreCurrentX': function() {
currentX = currentXStack.pop();
},
'$showText': function(y, text) {
text = Fonts.charsToUnicode(text);
this.translate(currentX, -1 * y);
this.fillText(text, 0, 0);
currentX += this.measureText(text).width;
},
'$putImageData': function(imageData, x, y) {
var imgData = this.getImageData(0, 0, imageData.width, imageData.height);
// Store the .data property to avaid property lookups.
var imageRealData = imageData.data;
var imgRealData = imgData.data;
// Copy over the imageData.
var len = imageRealData.length;
while (len--)
imgRealData[len] = imageRealData[len];
this.putImageData(imgData, x, y);
},
'$drawImage': function(id, x, y, sx, sy, swidth, sheight) {
var image = imagesList[id];
if (!image) {
throw 'Image not found: ' + id;
}
this.drawImage(image, x, y, image.width, image.height,
sx, sy, swidth, sheight);
},
'$drawCanvas': function(id, x, y, sx, sy, swidth, sheight) {
var canvas = canvasList[id];
if (!canvas) {
throw 'Canvas not found';
}
if (sheight != null) {
this.drawImage(canvas, x, y, canvas.width, canvas.height,
sx, sy, swidth, sheight);
} else {
this.drawImage(canvas, x, y, canvas.width, canvas.height);
}
},
'$createLinearGradient': function(x0, y0, x1, y1) {
gradient = this.createLinearGradient(x0, y0, x1, y1);
},
'$createPatternFromCanvas': function(patternId, canvasId, kind) {
var canvas = canvasList[canvasId];
if (!canvas) {
throw 'Canvas not found';
}
patternList[patternId] = this.createPattern(canvas, kind);
},
'$addColorStop': function(i, rgba) {
gradient.addColorStop(i, rgba);
},
'$fillStyleGradient': function() {
this.fillStyle = gradient;
},
'$fillStylePattern': function(id) {
var pattern = patternList[id];
if (!pattern) {
throw 'Pattern not found';
}
this.fillStyle = pattern;
},
'$strokeStyleGradient': function() {
this.strokeStyle = gradient;
},
'$strokeStylePattern': function(id) {
var pattern = patternList[id];
if (!pattern) {
throw 'Pattern not found';
}
this.strokeStyle = pattern;
},
'$setFont': function(name, size) {
this.font = size + 'px "' + name + '"';
Fonts.setActive(name, size);
}
};
function renderProxyCanvas(canvas, cmdQueue) {
var ctx = canvas.getContext('2d');
var cmdQueueLength = cmdQueue.length;
for (var i = 0; i < cmdQueueLength; i++) {
var opp = cmdQueue[i];
if (opp[0] == '$') {
ctx[opp[1]] = opp[2];
} else if (opp[0] in ctxSpecial) {
ctxSpecial[opp[0]].apply(ctx, opp[1]);
} else {
ctx[opp[0]].apply(ctx, opp[1]);
}
}
}
/**
* Functions to handle data sent by the WebWorker.
*/
var actionHandler = {
'log': function(data) {
console.log.apply(console, data);
},
'pdf_num_pages': function(data) {
this.numPages = parseInt(data);
if (this.loadCallback) {
this.loadCallback();
}
},
'font': function(data) {
var base64 = window.btoa(data.raw);
// Add the @font-face rule to the document
var url = 'url(data:' + data.mimetype + ';base64,' + base64 + ');';
var rule = ("@font-face { font-family:'" + data.fontName +
"';src:" + url + '}');
var styleSheet = document.styleSheets[0];
styleSheet.insertRule(rule, styleSheet.cssRules.length);
// Just adding the font-face to the DOM doesn't make it load. It
// seems it's loaded once Gecko notices it's used. Therefore,
// add a div on the page using the loaded font.
var div = document.createElement('div');
var style = 'font-family:"' + data.fontName +
'";position: absolute;top:-99999;left:-99999;z-index:-99999';
div.setAttribute('style', style);
document.body.appendChild(div);
},
'setup_page': function(data) {
var size = data.split(',');
var canvas = this.canvas, ctx = this.ctx;
canvas.width = parseInt(size[0]);
canvas.height = parseInt(size[1]);
},
'fonts': function(data) {
this.waitingForFonts = true;
this.fontWorker.ensureFonts(data, function() {
this.waitingForFonts = false;
var callbacks = this.waitingForFontsCallback;
for (var i = 0; i < callbacks.length; i++) {
callbacks[i]();
}
this.waitingForFontsCallback.length = 0;
}.bind(this));
},
'jpeg_stream': function(data) {
var img = new Image();
img.src = 'data:image/jpeg;base64,' + window.btoa(data.raw);
imagesList[data.id] = img;
},
'canvas_proxy_cmd_queue': function(data) {
var id = data.id;
var cmdQueue = data.cmdQueue;
// Check if there is already a canvas with the given id. If not,
// create a new canvas.
if (!canvasList[id]) {
var newCanvas = document.createElement('canvas');
newCanvas.width = data.width;
newCanvas.height = data.height;
canvasList[id] = newCanvas;
}
var renderData = function() {
if (id == 0) {
console.time('main canvas rendering');
var ctx = this.ctx;
ctx.save();
ctx.fillStyle = 'rgb(255, 255, 255)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.restore();
}
renderProxyCanvas(canvasList[id], cmdQueue);
if (id == 0) {
console.timeEnd('main canvas rendering');
console.timeEnd('>>> total page display time:');
}
}.bind(this);
if (this.waitingForFonts) {
if (id == 0) {
console.log('want to render, but not all fonts are there', id);
this.waitingForFontsCallback.push(renderData);
} else {
// console.log("assume canvas doesn't have fonts", id);
renderData();
}
} else {
renderData();
}
}
};
// Listen to the WebWorker for data and call actionHandler on it.
this.worker.onmessage = function(event) {
var data = event.data;
if (data.action in actionHandler) {
actionHandler[data.action].call(this, data.data);
} else {
throw 'Unkown action from worker: ' + data.action;
}
}.bind(this);
}
WorkerPDFDoc.prototype.open = function(url, callback) {
var req = new XMLHttpRequest();
req.open('GET', url);
req.mozResponseType = req.responseType = 'arraybuffer';
req.expected = (document.URL.indexOf('file:') == 0) ? 0 : 200;
req.onreadystatechange = function() {
if (req.readyState == 4 && req.status == req.expected) {
var data = req.mozResponseArrayBuffer || req.mozResponse ||
req.responseArrayBuffer || req.response;
this.loadCallback = callback;
this.worker.postMessage(data);
this.showPage(this.numPage);
}
}.bind(this);
req.send(null);
};
WorkerPDFDoc.prototype.showPage = function(numPage) {
this.numPage = parseInt(numPage);
console.log('=== start rendering page ' + numPage + ' ===');
console.time('>>> total page display time:');
this.worker.postMessage(numPage);
if (this.onChangePage) {
this.onChangePage(numPage);
}
};
WorkerPDFDoc.prototype.nextPage = function() {
if (this.numPage == this.numPages) return;
this.showPage(++this.numPage);
};
WorkerPDFDoc.prototype.prevPage = function() {
if (this.numPage == 1) return;
this.showPage(--this.numPage);
};

66
worker/font.js
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
'use strict';
importScripts('console.js');
importScripts('../pdf.js');
importScripts('../fonts.js');
importScripts('../glyphlist.js');
function fontDataToString(font) {
// Doing postMessage on objects make them lose their "shape". This adds the
// "shape" for all required objects agains, such that the encoding works as
// expected.
var fontFileDict = new Dict();
fontFileDict.map = font.file.dict.map;
var fontFile = new Stream(font.file.bytes, font.file.start,
font.file.end - font.file.start, fontFileDict);
font.file = new FlateStream(fontFile);
// This will encode the font.
var fontObj = new Font(font.name, font.file, font.properties);
// Create string that is used for css later.
var str = '';
var data = fontObj.data;
var length = data.length;
for (var j = 0; j < length; j++)
str += String.fromCharCode(data[j]);
return {
str: str,
encoding: font.properties.encoding
};
}
/**
* Functions to handle data sent by the MainThread.
*/
var actionHandler = {
'fonts': function(data) {
var fontData;
var result = {};
for (var i = 0; i < data.length; i++) {
fontData = data[i];
result[fontData.name] = fontDataToString(fontData);
}
postMessage({
action: 'fonts',
data: result
});
}
};
// Listen to the MainThread for data and call actionHandler on it.
this.onmessage = function(event) {
var data = event.data;
if (data.action in actionHandler) {
actionHandler[data.action].call(this, data.data);
} else {
throw 'Unkown action from worker: ' + data.action;
}
};