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

   1 description("Ensure correct behavior of canvas with fillPath using a pattern fillStyle and a 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) < 15)
  23         print("PASS " + a + " is around " + b , "green")
  24     else
  25         print("FAIL " + a + " is not around " + b + " (actual: " + evalA + ")", "red");
  26 }
  27
  28 var aCanvas = document.createElement('canvas');
  29 aCanvas.setAttribute('width', '50');
  30 aCanvas.setAttribute('height', '50');
  31
  32 var aCtx = aCanvas.getContext('2d');
  33 aCtx.fillStyle = 'rgba(0, 0, 255, 0.5)';
  34 aCtx.fillRect(0, 0, 50, 50);
  35
  36 var pattern = aCtx.createPattern(aCanvas, 'repeat');
  37
  38 var canvas = document.createElement('canvas');
  39 document.body.appendChild(canvas);
  40 canvas.setAttribute('width', '600');
  41 canvas.setAttribute('height', '1100');
  42 var ctx = canvas.getContext('2d');
  43
  44 ctx.save();
  45 ctx.fillStyle = pattern;
  46 ctx.shadowColor = 'rgba(255, 0, 0, 0.5)';
  47 ctx.shadowOffsetX = 250;
  48
  49 function fillShape(x, y) {
  50     ctx.beginPath();
  51     ctx.arc(x, y, 100, 0, Math.PI*2, true);
  52     ctx.arc(x, y, 50,  0, Math.PI*2, false);
  53     ctx.fill();
  54 }
  55
  56 // Alpha shadow.
  57 ctx.shadowBlur = 0;
  58 fillShape(150, 150);
  59
  60 // Blurry shadow.
  61 ctx.shadowBlur = 10;
  62 fillShape(150, 400);
  63
  64 ctx.rotate(Math.PI/2);
  65
  66 // Rotated alpha shadow.
  67 ctx.shadowBlur = 0;
  68 fillShape(650, -150);
  69
  70 // Rotated blurry shadow.
  71 ctx.shadowBlur = 10;
  72 fillShape(900, -150);
  73
  74 ctx.restore();
  75
  76 var imageData, data;
  77 ctx.fillStyle = 'black';
  78
  79 function test(alphaTestFunction, x, y, r, g, b, a) {
  80     // Get pixel.
  81     imageData = ctx.getImageData(x, y, 1, 1);
  82     data = imageData.data;
  83     // Test pixel color components.
  84     shouldBe('data[0]', r+'');
  85     shouldBe('data[1]', g+'');
  86     shouldBe('data[2]', b+'');
  87     alphaTestFunction('data[3]', a+'');
  88     // Plot test point.
  89     ctx.fillRect(x, y, 3, 3);
  90 }
  91
  92 print('Verifying alpha shadow...');
  93 test(shouldBe, 400, 150, 0, 0, 0, 0);
  94 test(shouldBeAround, 400, 75, 255,  0, 0, 64);
  95 test(shouldBeAround, 400, 225, 255, 0, 0, 64);
  96 test(shouldBeAround, 325, 150, 255, 0, 0, 64);
  97 test(shouldBeAround, 475, 150, 255, 0, 0, 64);
  98
  99 print(' ');
 100 print('Verifying blurry shadow...');
 101 test(shouldBe, 400, 400, 0, 0, 0, 0);
 102 test(shouldBeAround, 400, 300, 255, 0, 0, 31);
 103 test(shouldBeAround, 400, 500, 255, 0, 0, 31);
 104 test(shouldBeAround, 300, 400, 255, 0, 0, 31);
 105 test(shouldBeAround, 500, 400, 255, 0, 0, 31);
 106
 107 print(' ');
 108 print('Verifying rotated alpha shadow...');
 109 test(shouldBe, 400, 650, 0, 0, 0, 0);
 110 test(shouldBeAround, 400, 575, 255, 0, 0, 64);
 111 test(shouldBeAround, 400, 725, 255, 0, 0, 64);
 112 test(shouldBeAround, 325, 650, 255, 0, 0, 64);
 113 test(shouldBeAround, 475, 650, 255, 0, 0, 64);
 114
 115 print(' ');
 116 print('Verifying rotated blurry shadow...');
 117 test(shouldBe, 400, 900, 0, 0, 0, 0);
 118 test(shouldBeAround, 400, 800, 255, 0, 0, 31);
 119 test(shouldBeAround, 400, 1000, 255, 0, 0, 31);
 120 test(shouldBeAround, 300, 900, 255, 0, 0, 31);
 121 test(shouldBeAround, 500, 900, 255, 0, 0, 31);
 122
 123 print(' ');