| <!-- |
| 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"> |
| <title>WebGL toDataURL test</title> |
| <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 width="20" height="20" style="border: 1px solid black; width: 16px; height: 16px" id="c3d"></canvas> |
| <canvas width="20" height="20" style="border: 1px solid black; width: 16px; height: 16px" id="c2d"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script type="application/javascript"> |
| var wtu = WebGLTestUtils; |
| var numTests = 10; |
| var gl; |
| var ctx; |
| |
| var main = function() { |
| description(); |
| ctx = document.getElementById("c2d").getContext("2d"); |
| |
| var updateCanvas = function(width, height, attributes) { |
| var canvas = document.getElementById("c3d"); |
| |
| if (gl && (gl.attributes !== attributes)) { |
| // Attributes changed, recreate the canvas |
| var newCanvas = canvas.cloneNode(); |
| canvas.parentNode.replaceChild(newCanvas, canvas); |
| canvas = newCanvas; |
| gl = undefined; |
| } |
| |
| canvas.width = width; |
| canvas.height = height; |
| |
| if (!gl) { |
| gl = wtu.create3DContext(canvas, attributes); |
| |
| if (!gl) { |
| testFailed("can't create 3d context"); |
| return; |
| } |
| |
| gl.attributes = attributes; |
| } |
| |
| return gl; |
| }; |
| |
| var clearRect = function(gl, x, y, width, height, color) { |
| gl.clearColor(color[0] / 255, color[1] / 255, color[2] / 255, color[3] / 255); |
| gl.scissor(x, y, width, height); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| }; |
| |
| var testSize = function(width, height, attributes, callback) { |
| let attributesDebugMessage = ""; |
| if (attributes) { |
| attributesDebugMessage = " attributes: " + JSON.stringify(attributes); |
| } |
| debug("testing " + width + " by " + height + attributesDebugMessage); |
| var gl = updateCanvas(width, height, attributes); |
| if (!gl) { |
| callback(); |
| return; |
| } |
| |
| gl.viewport(0, 0, width, height); |
| gl.enable(gl.SCISSOR_TEST); |
| |
| var bottomColor = [255, 0, 0, 255]; |
| var topColor = [0, 255, 0, 255]; |
| var rightColor = [0, 0, 255, 255]; |
| var halfHeight = Math.floor(height / 2); |
| var topHeight = height - halfHeight; |
| var canvasTopHeight = height - topHeight; |
| clearRect(gl, 0, 0, width, halfHeight, bottomColor); |
| clearRect(gl, 0, halfHeight, width, topHeight, topColor); |
| clearRect(gl, width - 1, 0, 1, height, rightColor); |
| |
| // Performs gl.canvas.toDataURL() internally |
| var img = wtu.makeImageFromCanvas(gl.canvas, function() { |
| ctx.canvas.width = width; |
| ctx.canvas.height = height; |
| ctx.imageSmoothingEnabled = false; |
| ctx.drawImage(img, 0, 0); |
| wtu.checkCanvasRect(ctx, 0, 0, width - 1, topHeight, topColor); |
| wtu.checkCanvasRect(ctx, 0, topHeight, width - 1, halfHeight, bottomColor); |
| wtu.checkCanvasRect(ctx, width - 1, 0, 1, height, rightColor); |
| debug(""); |
| callback(); |
| }); |
| }; |
| |
| const premultipliedAlphaAttributes = { |
| premultipliedAlpha: false, |
| }; |
| var tests = [ |
| { width: 16 , height: 16 , }, |
| { width: 16 - 1, height: 16 , }, |
| { width: 16 - 1, height: 16 - 1, }, |
| { width: 16 + 1, height: 16 - 1, }, |
| { width: 16 - 1, height: 16 + 1, }, |
| { width: 256 , height: 256 , }, |
| { width: 256 - 1, height: 256 , }, |
| { width: 256 - 1, height: 256 - 1, }, |
| { width: 256 + 1, height: 256 - 1, }, |
| { width: 256 - 1, height: 256 + 1, }, |
| { width: 512 , height: 512 , }, |
| { width: 512 - 1, height: 512 , }, |
| { width: 512 - 1, height: 512 - 1, }, |
| { width: 512 + 1, height: 512 - 1, }, |
| { width: 512 - 1, height: 512 + 1, }, |
| { width: 16 , height: 16 , attributes: premultipliedAlphaAttributes}, |
| ]; |
| var testIndex = 0; |
| var runNextTest = function() { |
| if (testIndex == tests.length) { |
| finishTest(); |
| return; |
| } |
| var test = tests[testIndex++]; |
| testSize(test.width, test.height, test.attributes, function() { |
| setTimeout(runNextTest, 0); |
| }) |
| }; |
| runNextTest(); |
| }; |
| main(); |
| var successfullyParsed = true; |
| </script> |
| </body> |
| </html> |
| |
