| <!-- |
| Copyright (c) 2019 The Khronos Group Inc. |
| Use of this source code is governed by an MIT-style license that can be |
| found in the LICENSE.txt file. |
| --> |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <link rel="stylesheet" href="../../../resources/js-test-style.css"/> |
| <script src="../../../js/js-test-pre.js"></script> |
| <script src="../../../js/webgl-test-utils.js"></script> |
| </head> |
| <body> |
| <canvas id="c" width="16" height="16"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| "use strict"; |
| description('Tests canvas remains unchanged after it is used in webgl texutre'); |
| |
| debug("This is a regression test for <a href='https://bugs.chromium.org/p/chromium/issues/detail?id=446380'>Chromium Issue 446380</a>"); |
| debug(""); |
| |
| var wtu = WebGLTestUtils; |
| var gl = wtu.create3DContext("c", undefined, 2); |
| |
| function checkSourceCanvasImageData(imageDataBefore, imageDataAfter) { |
| if (imageDataBefore.length != imageDataAfter.length) { |
| testFailed("The size of image data in source canvas become different after it is used in webgl texture."); |
| return; |
| } |
| for (var i = 0; i < imageDataAfter.length; i++) { |
| if (imageDataBefore[i] != imageDataAfter[i]) { |
| testFailed("Pixel values in source canvas have changed after canvas used in webgl texture."); |
| return; |
| } |
| } |
| testPassed("Pixel values in source canvas remain unchanged after canvas used in webgl texture."); |
| } |
| |
| function runTest(width, height) { |
| var canvas = document.createElement("canvas"); |
| canvas.width = width; |
| canvas.height = height; |
| var ctx = canvas.getContext("2d"); |
| ctx.fillStyle = "rgba(1, 63, 127, 1)"; |
| ctx.fillRect(0, 0, canvas.width, canvas.height); |
| var refCanvas = document.createElement("canvas"); |
| refCanvas.width = width; |
| refCanvas.height = height; |
| var refCtx = refCanvas.getContext("2d"); |
| refCtx.fillStyle = "rgba(1, 63, 127, 1)"; |
| refCtx.fillRect(0, 0, canvas.width, canvas.height); |
| // A refCanvas with same data as canvas is used to get original image data, since |
| // getImageData may change hardware accelerated status of canvas and we don't want to |
| // omit testing for hardware accelerated canvas. |
| var imageDataBefore = refCtx.getImageData(0, 0, refCanvas.width, refCanvas.height); |
| var tex = gl.createTexture(); |
| gl.bindTexture(gl.TEXTURE_2D, tex); |
| gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, canvas); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "TexImage2D should succeed"); |
| checkSourceCanvasImageData(imageDataBefore, ctx.getImageData(0, 0, canvas.width, canvas.height)); |
| gl.deleteTexture(tex); |
| } |
| |
| runTest(2, 2); |
| runTest(257, 257); |
| |
| finishTest(); |
| </script> |
| </body> |
| </html> |
