third_party/WebKit/LayoutTests/fast/canvas/script-tests/canvas-fillRect-shadow.js

   1 description("Ensure correct behavior of canvas with fillRect shadow");
   2
   3 function print(message, color)
   4 {
   5     var paragraph = document.createElement("div");
   6     paragraph.appendChild(document.createTextNode(message));
   7     paragraph.style.fontFamily = "monospace";
   8     if (color)
   9         paragraph.style.color = color;
  10     document.getElementById("console").appendChild(paragraph);
  11 }
  12
  13 function shouldBeAround(a, b)
  14 {
  15     var evalA;
  16     try {
  17         evalA = eval(a);
  18     } catch(e) {
  19         evalA = e;
  20     }
  21
  22     if (Math.abs(evalA - b) < 5)
  23         print("PASS " + a + " is around " + b , "green")
  24     else
  25         print("FAIL " + a + " is not around " + b + " (actual: " + evalA + ")", "red");
  26 }
  27
  28 function shouldBeSmaller(a, b)
  29 {
  30     var evalA;
  31     try {
  32         evalA = eval(a);
  33     } catch(e) {
  34         evalA = e;
  35     }
  36
  37     if (evalA < b)
  38         print("PASS " + a + " is smaller than " + b , "green")
  39     else
  40         print("FAIL " + a + " is not smaller than " + b + " (actual: " + evalA + ")", "red");
  41 }
  42
  43 var canvas = document.createElement('canvas');
  44 document.body.appendChild(canvas);
  45 canvas.setAttribute('width', '400');
  46 canvas.setAttribute('height', '650');
  47 var ctx = canvas.getContext('2d');
  48
  49 ctx.shadowOffsetX = 200;
  50 ctx.fillStyle = 'rgba(0, 0, 255, 1)';
  51
  52 ctx.shadowColor = 'rgba(255, 0, 0, 1.0)';
  53 ctx.fillRect(50, 50, 100, 100);
  54
  55 ctx.shadowColor = 'rgba(255, 0, 0, 0.3)';
  56 ctx.fillRect(50, 200, 100, 100);
  57
  58 ctx.shadowColor = 'rgba(255, 0, 0, 1.0)';
  59 ctx.shadowBlur = 5;
  60 ctx.fillRect(50, 350, 100, 100);
  61
  62 ctx.shadowColor = 'rgba(255, 0, 0, 0.3)';
  63 ctx.fillRect(50, 500, 100, 100);
  64
  65 var d; // imageData.data
  66
  67 // Verify solid shadow.
  68 d = ctx.getImageData(250, 50, 1, 1).data;
  69 shouldBe('d[0]', '255');
  70 shouldBe('d[1]', '0');
  71 shouldBe('d[2]', '0');
  72 shouldBe('d[3]', '255');
  73
  74 d = ctx.getImageData(250, 149, 1, 1).data;
  75 shouldBe('d[0]', '255');
  76 shouldBe('d[1]', '0');
  77 shouldBe('d[2]', '0');
  78 shouldBe('d[3]', '255');
  79
  80 d = ctx.getImageData(349, 50, 1, 1).data;
  81 shouldBe('d[0]', '255');
  82 shouldBe('d[1]', '0');
  83 shouldBe('d[2]', '0');
  84 shouldBe('d[3]', '255');
  85
  86 d = ctx.getImageData(349, 149, 1, 1).data;
  87 shouldBe('d[0]', '255');
  88 shouldBe('d[1]', '0');
  89 shouldBe('d[2]', '0');
  90 shouldBe('d[3]', '255');
  91
  92 // Verify solid alpha shadow.
  93 d = ctx.getImageData(250, 200, 1, 1).data;
  94 shouldBe('d[0]', '255');
  95 shouldBe('d[1]', '0');
  96 shouldBe('d[2]', '0');
  97 shouldBeAround('d[3]', '76');
  98
  99 d = ctx.getImageData(250, 299, 1, 1).data;
 100 shouldBe('d[0]', '255');
 101 shouldBe('d[1]', '0');
 102 shouldBe('d[2]', '0');
 103 shouldBeAround('d[3]', '76');
 104
 105 d = ctx.getImageData(349, 200, 1, 1).data;
 106 shouldBe('d[0]', '255');
 107 shouldBe('d[1]', '0');
 108 shouldBe('d[2]', '0');
 109 shouldBeAround('d[3]', '76');
 110
 111 d = ctx.getImageData(349, 299, 1, 1).data;
 112 shouldBe('d[0]', '255');
 113 shouldBe('d[1]', '0');
 114 shouldBe('d[2]', '0');
 115 shouldBeAround('d[3]', '76');
 116
 117 // Verify blurry shadow.
 118 d = ctx.getImageData(248, 348, 1, 1).data;
 119 shouldBe('d[0]', '255');
 120 shouldBe('d[1]', '0');
 121 shouldBe('d[2]', '0');
 122 shouldBeSmaller('d[3]', '25');
 123
 124 d = ctx.getImageData(248, 451, 1, 1).data;
 125 shouldBe('d[0]', '255');
 126 shouldBe('d[1]', '0');
 127 shouldBe('d[2]', '0');
 128 shouldBeSmaller('d[3]', '25');
 129
 130 d = ctx.getImageData(351, 348, 1, 1).data;
 131 shouldBe('d[0]', '255');
 132 shouldBe('d[1]', '0');
 133 shouldBe('d[2]', '0');
 134 shouldBeSmaller('d[3]', '25');
 135
 136 d = ctx.getImageData(351, 451, 1, 1).data;
 137 shouldBe('d[0]', '255');
 138 shouldBe('d[1]', '0');
 139 shouldBe('d[2]', '0');
 140 shouldBeSmaller('d[3]', '25');
 141
 142 // Verify blurry alpha shadow.
 143 d = ctx.getImageData(248, 498, 1, 1).data;
 144 shouldBe('d[0]', '255');
 145 shouldBe('d[1]', '0');
 146 shouldBe('d[2]', '0');
 147 shouldBeSmaller('d[3]', '10');
 148
 149 d = ctx.getImageData(248, 601, 1, 1).data;
 150 shouldBe('d[0]', '255');
 151 shouldBe('d[1]', '0');
 152 shouldBe('d[2]', '0');
 153 shouldBeSmaller('d[3]', '10');
 154
 155 d = ctx.getImageData(351, 498, 1, 1).data;
 156 shouldBe('d[0]', '255');
 157 shouldBe('d[1]', '0');
 158 shouldBe('d[2]', '0');
 159 shouldBeSmaller('d[3]', '10');
 160
 161 d = ctx.getImageData(351, 601, 1, 1).data;
 162 shouldBe('d[0]', '255');
 163 shouldBe('d[1]', '0');
 164 shouldBe('d[2]', '0');
 165 shouldBeSmaller('d[3]', '10');