third_party/WebKit/LayoutTests/printing/resources/webgl-repeated-printing-common.js

   1 var gl;
   2
   3 function main()
   4 {
   5   if (!window.testRunner) {
   6     testFailed("Requires window.testRunner");
   7   } else {
   8     testRunner.waitUntilDone();
   9     testRunner.setPrinting();
  10     testRunner.dumpAsText();
  11     window.requestAnimationFrame(initTest);
  12   }
  13 }
  14
  15 var testIndex = 0;
  16 var testsAndExpectations = [
  17   { 'description': 'green', 'clearColor': [0, 1, 0, 1], 'expected': [  0, 255,   0] },
  18   { 'description': 'red',   'clearColor': [1, 0, 0, 1], 'expected': [255,   0,   0] },
  19   { 'description': 'blue',  'clearColor': [0, 0, 1, 1], 'expected': [  0,   0, 255] },
  20 ];
  21 var tolerance = 1;
  22
  23 function initTest() {
  24   var canvas = document.getElementById("c");
  25   gl = initGL(canvas);
  26   if (!gl) {
  27     testFailed("Test requires WebGL");
  28     testRunner.notifyDone();
  29     return;
  30   }
  31
  32    window.requestAnimationFrame(nextTest);
  33 }
  34
  35 function nextTest() {
  36   if (testIndex >= testsAndExpectations.length) {
  37     // Without clearing this bit, the output comes out as a render
  38     // tree, which is difficult to read.
  39     testRunner.clearPrinting();
  40     testRunner.notifyDone();
  41     return;
  42   }
  43
  44   var test = testsAndExpectations[testIndex];
  45   var color = test['clearColor'];
  46   try {
  47     draw(color[0], color[1], color[2], color[3]);
  48     testRunner.capturePixelsAsyncThen(completionCallback);
  49   } catch (e) {
  50     debug('error in nextTest');
  51     debug(e);
  52     testRunner.notifyDone();
  53   }
  54 }
  55
  56 var pixel;
  57 function fetchPixelAt(x, y, width, height, snapshot) {
  58   var data = new Uint8Array(snapshot);
  59   pixel = [
  60     data[4 * (width * y + x) + 0],
  61     data[4 * (width * y + x) + 1],
  62     data[4 * (width * y + x) + 2],
  63     data[4 * (width * y + x) + 3]
  64   ];
  65 }
  66
  67 function completionCallback(width, height, snapshot) {
  68   var test = testsAndExpectations[testIndex];
  69   debug('Test ' + testIndex + ': canvas should be ' + test['description']);
  70   try {
  71     var expectation = test['expected'];
  72     fetchPixelAt(50, 50, width, height, snapshot);
  73     shouldBeCloseTo('pixel[0]', expectation[0], tolerance);
  74     shouldBeCloseTo('pixel[1]', expectation[1], tolerance);
  75     shouldBeCloseTo('pixel[2]', expectation[2], tolerance);
  76   } catch (e) {
  77     debug('error in completionCallback');
  78     debug(e);
  79     testRunner.notifyDone();
  80     return;
  81   }
  82
  83   ++testIndex;
  84   window.requestAnimationFrame(nextTest);
  85 }
  86
  87 function draw(r, g, b, a)
  88 {
  89   gl.clearColor(r, g, b, a);
  90   gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  91 }
  92
  93 main();