Move all worker related files under worker/

worker/client.js

@@ -0,0 +1,272 @@
+/* -*- 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 WorkerPDFDoc(canvas) {
+  var timer = null
+
+  this.ctx = canvas.getContext("2d");
+  this.canvas = canvas;
+  this.worker = new Worker('worker/pdf.js');
+
+  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();
+    },
+
+    "$showText": function(y, text) {
+      this.translate(currentX, -1 * y);
+      this.fillText(text, 0, 0);
+      currentX += this.measureText(text).width;
+    },
+
+    "$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;
+    },
+
+    "$strokeStylePattern": function(id) {
+      var pattern = patternList[id];
+      if (!pattern) {
+        throw "Pattern not found";
+      }
+      this.strokeStyle = pattern;
+    }
+  }
+
+  function renderProxyCanvas(canvas, cmdQueue) {
+    var ctx = canvas.getContext("2d");
+    var cmdQueueLength = cmdQueue.length;
+    for (var i = 0; i < cmdQueueLength; i++) {
+      var opp = cmdQueue[i];
+      if (opp[0] == "$") {
+        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.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);
+    },
+
+    "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);
+}