Chris Jones
14 years ago
6 changed files with 749 additions and 40 deletions
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- / |
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */ |
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"use strict"; |
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var JpegStreamProxyCounter = 0; |
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// WebWorker Proxy for JpegStream.
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var JpegStreamProxy = (function() { |
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function constructor(bytes, dict) { |
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this.id = JpegStreamProxyCounter++; |
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this.dict = dict; |
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// Tell the main thread to create an image.
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postMessage({ |
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action: "jpeg_stream", |
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data: { |
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id: this.id, |
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raw: bytesToString(bytes) |
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} |
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}); |
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} |
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constructor.prototype = { |
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getImage: function() { |
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return this; |
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}, |
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getChar: function() { |
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error("internal error: getChar is not valid on JpegStream"); |
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} |
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}; |
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return constructor; |
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})(); |
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// Really simple GradientProxy. There is currently only one active gradient at
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// the time, meaning you can't create a gradient, create a second one and then
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// use the first one again. As this isn't used in pdf.js right now, it's okay.
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function GradientProxy(cmdQueue, x0, y0, x1, y1) { |
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cmdQueue.push(["$createLinearGradient", [x0, y0, x1, y1]]); |
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this.addColorStop = function(i, rgba) { |
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cmdQueue.push(["$addColorStop", [i, rgba]]); |
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} |
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} |
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// Really simple PatternProxy.
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var patternProxyCounter = 0; |
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function PatternProxy(cmdQueue, object, kind) { |
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this.id = patternProxyCounter++; |
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if (!(object instanceof CanvasProxy) ) { |
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throw "unkown type to createPattern"; |
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} |
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// Flush the object here to ensure it's available on the main thread.
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// TODO: Make some kind of dependency management, such that the object
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// gets flushed only if needed.
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object.flush(); |
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cmdQueue.push(["$createPatternFromCanvas", [this.id, object.id, kind]]); |
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} |
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var canvasProxyCounter = 0; |
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function CanvasProxy(width, height) { |
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this.id = canvasProxyCounter++; |
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// The `stack` holds the rendering calls and gets flushed to the main thead.
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var cmdQueue = this.cmdQueue = []; |
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// Dummy context that gets exposed.
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var ctx = {}; |
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this.getContext = function(type) { |
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if (type != "2d") { |
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throw "CanvasProxy can only provide a 2d context."; |
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} |
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return ctx; |
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} |
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// Expose only the minimum of the canvas object - there is no dom to do
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// more here.
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this.width = width; |
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this.height = height; |
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ctx.canvas = this; |
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// Setup function calls to `ctx`.
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var ctxFunc = [ |
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"createRadialGradient", |
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"arcTo", |
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"arc", |
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"fillText", |
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"strokeText", |
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"createImageData", |
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"drawWindow", |
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"save", |
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"restore", |
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"scale", |
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"rotate", |
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"translate", |
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"transform", |
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"setTransform", |
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"clearRect", |
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"fillRect", |
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"strokeRect", |
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"beginPath", |
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"closePath", |
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"moveTo", |
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"lineTo", |
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"quadraticCurveTo", |
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"bezierCurveTo", |
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"rect", |
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"fill", |
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"stroke", |
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"clip", |
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"measureText", |
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"isPointInPath", |
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// These functions are necessary to track the rendering currentX state.
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// The exact values can be computed on the main thread only, as the
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// worker has no idea about text width.
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"$setCurrentX", |
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"$addCurrentX", |
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"$saveCurrentX", |
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"$restoreCurrentX", |
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"$showText" |
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]; |
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function buildFuncCall(name) { |
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return function() { |
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// console.log("funcCall", name)
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cmdQueue.push([name, Array.prototype.slice.call(arguments)]); |
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} |
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} |
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var name; |
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for (var i = 0; i < ctxFunc.length; i++) { |
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name = ctxFunc[i]; |
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ctx[name] = buildFuncCall(name); |
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} |
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// Some function calls that need more work.
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ctx.createPattern = function(object, kind) { |
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return new PatternProxy(cmdQueue, object, kind); |
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} |
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ctx.createLinearGradient = function(x0, y0, x1, y1) { |
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return new GradientProxy(cmdQueue, x0, y0, x1, y1); |
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} |
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ctx.getImageData = function(x, y, w, h) { |
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return { |
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width: w, |
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height: h, |
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data: Uint8ClampedArray(w * h * 4) |
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}; |
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} |
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ctx.putImageData = function(data, x, y, width, height) { |
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cmdQueue.push(["$putImageData", [data, x, y, width, height]]); |
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} |
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ctx.drawImage = function(image, x, y, width, height, sx, sy, swidth, sheight) { |
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if (image instanceof CanvasProxy) { |
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// Send the image/CanvasProxy to the main thread.
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image.flush(); |
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cmdQueue.push(["$drawCanvas", [image.id, x, y, sx, sy, swidth, sheight]]); |
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} else if(image instanceof JpegStreamProxy) { |
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cmdQueue.push(["$drawImage", [image.id, x, y, sx, sy, swidth, sheight]]) |
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} else { |
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throw "unkown type to drawImage"; |
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} |
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} |
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// Setup property access to `ctx`.
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var ctxProp = { |
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// "canvas"
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"globalAlpha": "1", |
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"globalCompositeOperation": "source-over", |
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"strokeStyle": "#000000", |
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"fillStyle": "#000000", |
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"lineWidth": "1", |
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"lineCap": "butt", |
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"lineJoin": "miter", |
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"miterLimit": "10", |
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"shadowOffsetX": "0", |
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"shadowOffsetY": "0", |
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"shadowBlur": "0", |
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"shadowColor": "rgba(0, 0, 0, 0)", |
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"font": "10px sans-serif", |
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"textAlign": "start", |
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"textBaseline": "alphabetic", |
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"mozTextStyle": "10px sans-serif", |
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"mozImageSmoothingEnabled": "true" |
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} |
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function buildGetter(name) { |
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return function() { |
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return ctx["$" + name]; |
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} |
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} |
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function buildSetter(name) { |
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return function(value) { |
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cmdQueue.push(["$", name, value]); |
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return ctx["$" + name] = value; |
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} |
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} |
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// Setting the value to `stroke|fillStyle` needs special handling, as it
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// might gets an gradient/pattern.
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function buildSetterStyle(name) { |
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return function(value) { |
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if (value instanceof GradientProxy) { |
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cmdQueue.push(["$" + name + "Gradient"]); |
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} else if (value instanceof PatternProxy) { |
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cmdQueue.push(["$" + name + "Pattern", [value.id]]); |
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} else { |
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cmdQueue.push(["$", name, value]); |
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return ctx["$" + name] = value; |
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} |
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} |
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} |
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for (var name in ctxProp) { |
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ctx["$" + name] = ctxProp[name]; |
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ctx.__defineGetter__(name, buildGetter(name)); |
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// Special treatment for `fillStyle` and `strokeStyle`: The passed style
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// might be a gradient. Need to check for that.
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if (name == "fillStyle" || name == "strokeStyle") { |
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ctx.__defineSetter__(name, buildSetterStyle(name)); |
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} else { |
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ctx.__defineSetter__(name, buildSetter(name)); |
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} |
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} |
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} |
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/** |
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* Sends the current cmdQueue of the CanvasProxy over to the main thread and |
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* resets the cmdQueue. |
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*/ |
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CanvasProxy.prototype.flush = function() { |
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postMessage({ |
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action: "canvas_proxy_cmd_queue", |
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data: { |
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id: this.id, |
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cmdQueue: this.cmdQueue, |
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width: this.width, |
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height: this.height |
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} |
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}); |
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this.cmdQueue.length = 0; |
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} |
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@ -0,0 +1,88 @@
@@ -0,0 +1,88 @@
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- / |
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */ |
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"use strict"; |
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var consoleTimer = {}; |
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var console = { |
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log: function log() { |
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var args = Array.prototype.slice.call(arguments); |
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postMessage({ |
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action: "log", |
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data: args |
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}); |
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}, |
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time: function(name) { |
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consoleTimer[name] = Date.now(); |
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}, |
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timeEnd: function(name) { |
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var time = consoleTimer[name]; |
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if (time == null) { |
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throw "Unkown timer name " + name; |
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} |
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this.log("Timer:", name, Date.now() - time); |
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} |
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} |
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//
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importScripts("canvas_proxy.js"); |
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importScripts("pdf.js"); |
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importScripts("fonts.js"); |
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importScripts("glyphlist.js") |
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// Use the JpegStreamProxy proxy.
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JpegStream = JpegStreamProxy; |
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// Create the WebWorkerProxyCanvas.
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var canvas = new CanvasProxy(1224, 1584); |
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// Listen for messages from the main thread.
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var pdfDocument = null; |
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onmessage = function(event) { |
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var data = event.data; |
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// If there is no pdfDocument yet, then the sent data is the PDFDocument.
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if (!pdfDocument) { |
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pdfDocument = new PDFDoc(new Stream(data)); |
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postMessage({ |
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action: "pdf_num_pages", |
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data: pdfDocument.numPages |
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}); |
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return; |
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} |
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// User requested to render a certain page.
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else { |
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console.time("compile"); |
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// Let's try to render the first page...
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var page = pdfDocument.getPage(parseInt(data)); |
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// page.compile will collect all fonts for us, once we have loaded them
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// we can trigger the actual page rendering with page.display
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var fonts = []; |
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var gfx = new CanvasGraphics(canvas.getContext("2d"), CanvasProxy); |
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page.compile(gfx, fonts); |
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console.timeEnd("compile"); |
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console.time("fonts"); |
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// Inspect fonts and translate the missing one.
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var count = fonts.length; |
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for (var i = 0; i < count; i++) { |
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var font = fonts[i]; |
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if (Fonts[font.name]) { |
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fontsReady = fontsReady && !Fonts[font.name].loading; |
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continue; |
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} |
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// This "builds" the font and sents it over to the main thread.
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new Font(font.name, font.file, font.properties); |
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} |
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console.timeEnd("fonts"); |
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console.time("display"); |
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page.display(gfx); |
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canvas.flush(); |
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console.timeEnd("display"); |
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} |
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} |
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@@ -0,0 +1,46 @@
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<html> |
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<head> |
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<title>Simple pdf.js page worker viewer</title> |
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<script type="text/javascript" src="worker_client.js"></script> |
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<script> |
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var pdfDoc; |
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window.onload = function() { |
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window.canvas = document.getElementById("canvas"); |
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window.ctx = canvas.getContext("2d"); |
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pdfDoc = new WorkerPDFDoc(window.canvas); |
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pdfDoc.onChangePage = function(numPage) { |
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document.getElementById("pageNumber").value = numPage; |
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} |
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// pdfDoc.open("canvas.pdf", function() { |
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pdfDoc.open("compressed.tracemonkey-pldi-09.pdf", function() { |
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document.getElementById("numPages").innerHTML = "/" + pdfDoc.numPages; |
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}) |
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} |
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</script> |
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<link rel="stylesheet" href="viewer.css"></link> |
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</head> |
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<body> |
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<div id="controls"> |
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<input type="file" style="float: right; margin: auto 32px;" onChange="load(this.value.toString());"></input> |
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<!-- This only opens supported PDFs from the source path... |
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-- Can we use JSONP to overcome the same-origin restrictions? --> |
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<button onclick="pdfDoc.prevPage();">Previous</button> |
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<button onclick="pdfDoc.nextPage();">Next</button> |
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<input type="text" id="pageNumber" onchange="pdfDoc.showPage(this.value);" |
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value="1" size="4"></input> |
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<span id="numPages">--</span> |
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<span id="info"></span> |
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</div> |
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<div id="viewer"> |
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<!-- Canvas dimensions must be specified in CSS pixels. CSS pixels |
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are always 96 dpi. 816x1056 is 8.5x11in at 96dpi. --> |
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<!-- We're rendering here at 1.5x scale. --> |
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<canvas id="canvas" width="1224" height="1584"></canvas> |
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</div> |
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</body> |
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</html> |
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@ -0,0 +1,272 @@
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- / |
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */ |
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"use strict"; |
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if (typeof console.time == "undefined") { |
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var consoleTimer = {}; |
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console.time = function(name) { |
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consoleTimer[name] = Date.now(); |
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}; |
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console.timeEnd = function(name) { |
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var time = consoleTimer[name]; |
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if (time == null) { |
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throw "Unkown timer name " + name; |
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} |
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this.log("Timer:", name, Date.now() - time); |
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}; |
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} |
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function WorkerPDFDoc(canvas) { |
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var timer = null |
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this.ctx = canvas.getContext("2d"); |
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this.canvas = canvas; |
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this.worker = new Worker('pdf_worker.js'); |
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this.numPage = 1; |
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this.numPages = null; |
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var imagesList = {}; |
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var canvasList = { |
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0: canvas |
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}; |
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var patternList = {}; |
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var gradient; |
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var currentX = 0; |
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var currentXStack = []; |
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var ctxSpecial = { |
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"$setCurrentX": function(value) { |
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currentX = value; |
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}, |
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"$addCurrentX": function(value) { |
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currentX += value; |
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}, |
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"$saveCurrentX": function() { |
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currentXStack.push(currentX); |
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}, |
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"$restoreCurrentX": function() { |
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currentX = currentXStack.pop(); |
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}, |
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"$showText": function(y, text) { |
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this.translate(currentX, -1 * y); |
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this.fillText(text, 0, 0); |
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currentX += this.measureText(text).width; |
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}, |
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"$putImageData": function(imageData, x, y) { |
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var imgData = this.getImageData(0, 0, imageData.width, imageData.height); |
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// Store the .data property to avaid property lookups.
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var imageRealData = imageData.data; |
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var imgRealData = imgData.data; |
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// Copy over the imageData.
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var len = imageRealData.length; |
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while (len--) |
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imgRealData[len] = imageRealData[len] |
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this.putImageData(imgData, x, y); |
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}, |
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"$drawImage": function(id, x, y, sx, sy, swidth, sheight) { |
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var image = imagesList[id]; |
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if (!image) { |
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throw "Image not found: " + id; |
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} |
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this.drawImage(image, x, y, image.width, image.height, |
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sx, sy, swidth, sheight); |
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}, |
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"$drawCanvas": function(id, x, y, sx, sy, swidth, sheight) { |
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var canvas = canvasList[id]; |
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if (!canvas) { |
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throw "Canvas not found"; |
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} |
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if (sheight != null) { |
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this.drawImage(canvas, x, y, canvas.width, canvas.height, |
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sx, sy, swidth, sheight); |
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} else { |
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this.drawImage(canvas, x, y, canvas.width, canvas.height); |
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} |
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}, |
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|
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"$createLinearGradient": function(x0, y0, x1, y1) { |
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gradient = this.createLinearGradient(x0, y0, x1, y1); |
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}, |
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|
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"$createPatternFromCanvas": function(patternId, canvasId, kind) { |
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var canvas = canvasList[canvasId]; |
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if (!canvas) { |
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throw "Canvas not found"; |
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} |
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patternList[patternId] = this.createPattern(canvas, kind); |
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}, |
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|
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"$addColorStop": function(i, rgba) { |
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gradient.addColorStop(i, rgba); |
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}, |
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|
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"$fillStyleGradient": function() { |
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this.fillStyle = gradient; |
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}, |
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|
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"$fillStylePattern": function(id) { |
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var pattern = patternList[id]; |
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if (!pattern) { |
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throw "Pattern not found"; |
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} |
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this.fillStyle = pattern; |
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}, |
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|
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"$strokeStyleGradient": function() { |
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this.strokeStyle = gradient; |
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}, |
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|
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"$strokeStylePattern": function(id) { |
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var pattern = patternList[id]; |
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if (!pattern) { |
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throw "Pattern not found"; |
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} |
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this.strokeStyle = pattern; |
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} |
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} |
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|
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function renderProxyCanvas(canvas, cmdQueue) { |
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var ctx = canvas.getContext("2d"); |
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var cmdQueueLength = cmdQueue.length; |
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for (var i = 0; i < cmdQueueLength; i++) { |
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var opp = cmdQueue[i]; |
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if (opp[0] == "$") { |
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ctx[opp[1]] = opp[2]; |
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} else if (opp[0] in ctxSpecial) { |
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ctxSpecial[opp[0]].apply(ctx, opp[1]); |
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} else { |
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ctx[opp[0]].apply(ctx, opp[1]); |
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} |
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} |
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} |
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|
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/** |
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* Functions to handle data sent by the WebWorker. |
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*/ |
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var actionHandler = { |
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"log": function(data) { |
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console.log.apply(console, data); |
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}, |
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|
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"pdf_num_pages": function(data) { |
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this.numPages = parseInt(data); |
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if (this.loadCallback) { |
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this.loadCallback(); |
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} |
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}, |
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"font": function(data) { |
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var base64 = window.btoa(data.raw); |
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|
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// Add the @font-face rule to the document
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var url = "url(data:" + data.mimetype + ";base64," + base64 + ");"; |
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var rule = "@font-face { font-family:'" + data.fontName + "';src:" + url + "}"; |
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var styleSheet = document.styleSheets[0]; |
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styleSheet.insertRule(rule, styleSheet.length); |
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|
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// Just adding the font-face to the DOM doesn't make it load. It
|
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// seems it's loaded once Gecko notices it's used. Therefore,
|
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// 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); |
||||
}, |
||||
|
||||
"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; |
||||
} |
||||
|
||||
// There might be fonts that need to get loaded. Shedule the
|
||||
// rendering at the end of the event queue ensures this.
|
||||
setTimeout(function() { |
||||
if (id == 0) { |
||||
console.time("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("canvas rendering") |
||||
}, 0, this); |
||||
} |
||||
} |
||||
|
||||
// List 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; |
||||
} |
||||
} |
||||
} |
||||
|
||||
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); |
||||
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); |
||||
} |
||||
Loading…
Reference in new issue