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Side by Side Diff: LayoutTests/fast/canvas/webgl/resources/draw-webgl-to-canvas-2d.js

Issue 750273003: canvas: calling toDataURL without context doesn't create a buffer of canvas 2d. (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master
Patch Set: fix typo Created 6 years ago
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1 <!DOCTYPE html>
2 <html>
3 <body>
4 <span id="description" style="color: white">
5 This test checks for drawing webgl to canvas 2d. The test process is as follows:
6 1. draw a green rect on a webgl context.
7 2. draw a red rect on a canvas 2d context, and check a pixel (should be red).
8 3. draw the webgl contents on the canvas 2d context, and check a pixel (should b e green).
9 4. wait for few frames.
10 5. draw a red rect on the canvas 2d context, and check a pixel (should be red).
11 6. draw the webgl contents on the canvas 2d context, and check a pixel (see belo w explanation).
12
13 Above test is executed for both preserve and non-preserve webgl contexts.
14 For the preserve webgl context, the pixel on #6 is green.
15 For the non-preserve webgl context, the pixel on #6 is undefined.[1]
16
17 [1] http://www.khronos.org/registry/webgl/specs/latest/1.0/.
18 "This default behavior can be changed by setting the preserveDrawingBuffer
19 attribute of the WebGLContextAttributes object. If this flag is true, the
20 contents of the drawing buffer shall be preserved until the author either clears
21 or overwrites them. If this flag is false, attempting to perform operations
22 using this context as a source image after the rendering function has returned
23 can lead to undefined behavior.".
24 </span>
25 <canvas id="preserve-canvas3d" width="100" height="100"></canvas>
26 <canvas id="preserve-canvas2d" width="100" height="100"></canvas>
27 <canvas id="nonpreserve-canvas3d" width="100" height="100"></canvas>
28 <canvas id="nonpreserve-canvas2d" width="100" height="100"></canvas>
29 <script src="../../../resources/js-test.js"></script>
30 <script>
31 if (window.testRunner) { 1 if (window.testRunner) {
32 testRunner.dumpAsText(); 2 testRunner.dumpAsText();
33 testRunner.waitUntilDone(); 3 testRunner.waitUntilDone();
34 } 4 }
35 5
36 var preserve_ctx2D; 6 var preserve_ctx2D;
37 var preserve_canvas3D; 7 var preserve_canvas3D;
38 var preserve_gl; 8 var preserve_gl;
39 var nonpreserve_ctx2D; 9 var nonpreserve_ctx2D;
40 var nonpreserve_canvas3D; 10 var nonpreserve_canvas3D;
41 var nonpreserve_gl; 11 var nonpreserve_gl;
42 var imgdata; 12 var imgdata;
43 13
44 function createContexts() {
45 preserve_ctx2D = document.getElementById("preserve-canvas2d").getContext("2d ");
46 preserve_canvas3D = document.getElementById('preserve-canvas3d');
47 preserve_gl = preserve_canvas3D.getContext('webgl', {'preserveDrawingBuffer' : true});
48 nonpreserve_ctx2D = document.getElementById("nonpreserve-canvas2d").getConte xt("2d");
49 nonpreserve_canvas3D = document.getElementById('nonpreserve-canvas3d');
50 nonpreserve_gl = nonpreserve_canvas3D.getContext('webgl', {'preserveDrawingB uffer': false});
51 }
52
53 function renderWebGL(gl) { 14 function renderWebGL(gl) {
54 gl.clearColor(0, 1, 0, 1); 15 gl.clearColor(0, 1, 0, 1);
55 gl.clear(gl.COLOR_BUFFER_BIT); 16 gl.clear(gl.COLOR_BUFFER_BIT);
56 } 17 }
57 18
58 function drawWebGLToCanvas2D(ctx2D, canvas3D, isDrawingBufferUndefined) { 19 function drawWebGLToCanvas2D(ctx2D, canvas3D, isDrawingBufferUndefined) {
59 // draw red rect on canvas 2d. 20 // draw red rect on canvas 2d.
60 ctx2D.fillStyle = 'red'; 21 ctx2D.fillStyle = 'red';
61 ctx2D.fillRect(0, 0, 100, 100); 22 ctx2D.fillRect(0, 0, 100, 100);
62 var imageData = ctx2D.getImageData(0, 0, 1, 1); 23 var imageData = ctx2D.getImageData(0, 0, 1, 1);
(...skipping 48 matching lines...) Expand 10 before | Expand all | Expand 10 after
111 testRunner.waitUntilDone(); 72 testRunner.waitUntilDone();
112 testRunner.displayAsyncThen(asyncTest); 73 testRunner.displayAsyncThen(asyncTest);
113 } else { 74 } else {
114 window.requestAnimationFrame(asyncTest); 75 window.requestAnimationFrame(asyncTest);
115 } 76 }
116 } 77 }
117 78
118 window.onload = function () { 79 window.onload = function () {
119 window.requestAnimationFrame(startTestAfterFirstPaint); 80 window.requestAnimationFrame(startTestAfterFirstPaint);
120 } 81 }
121
122 </script>
123 </body>
124 </html>
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