src/third_party/trace-viewer/trace_viewer/cc/picture_as_image_data.html

   1 <!DOCTYPE html>
   2 <!--
   3 Copyright (c) 2013 The Chromium Authors. All rights reserved.
   4 Use of this source code is governed by a BSD-style license that can be
   5 found in the LICENSE file.
   6 -->
   7
   8 <link rel="import" href="/tvcm.html">
   9 <script>
  10 'use strict';
  11
  12 tvcm.exportTo('cc', function() {
  13   /**
  14    * @constructor
  15    */
  16   function PictureAsImageData(picture, errorOrImageData) {
  17     this.picture_ = picture;
  18     if (errorOrImageData instanceof ImageData) {
  19       this.error_ = undefined;
  20       this.imageData_ = errorOrImageData;
  21     } else {
  22       this.error_ = errorOrImageData;
  23       this.imageData_ = undefined;
  24     }
  25   };
  26
  27   /**
  28    * Creates a new pending PictureAsImageData (no image data and no error).
  29    *
  30    * @return {PictureAsImageData} a new pending PictureAsImageData.
  31    */
  32   PictureAsImageData.Pending = function(picture) {
  33     return new PictureAsImageData(picture, undefined);
  34   };
  35
  36   PictureAsImageData.prototype = {
  37     get picture() {
  38       return this.picture_;
  39     },
  40
  41     get error() {
  42       return this.error_;
  43     },
  44
  45     get imageData() {
  46       return this.imageData_;
  47     },
  48
  49     isPending: function() {
  50       return this.error_ === undefined && this.imageData_ === undefined;
  51     },
  52
  53     asCanvas: function() {
  54       if (!this.imageData_)
  55         return;
  56
  57       var canvas = document.createElement('canvas');
  58       var ctx = canvas.getContext('2d');
  59
  60       canvas.width = this.imageData_.width;
  61       canvas.height = this.imageData_.height;
  62       ctx.putImageData(this.imageData_, 0, 0);
  63       return canvas;
  64     }
  65   };
  66
  67   return {
  68     PictureAsImageData: PictureAsImageData
  69   };
  70 });
  71 </script>