| <!-- |
| 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> |
| <style> |
| .pattern { |
| white-space: nowrap; |
| display: inline-block; |
| } |
| canvas { |
| width:10px; |
| height:10px; |
| } |
| .square { |
| display:inline-block; |
| width:10px; |
| height:10px; |
| background-color:red; |
| } |
| </style> |
| <script> |
| "use strict"; |
| var wtu = WebGLTestUtils; |
| function checkResult(ctx1, ctx2, preserve) { |
| var imgData1 = ctx1.getImageData(0,0,1,1); |
| var imgData2 = ctx2.getImageData(0,0,1,1); |
| var correct1 = [255,0,0,255]; |
| var correct2 = preserve ? [255,0,0,255] : [0,0,0,255]; |
| var ok1 = true; |
| var ok2 = true; |
| for (var p = 0; p < 4; ++p) { |
| if (imgData1.data[p] != correct1[p]) |
| ok1 = false; |
| if (imgData2.data[p] != correct2[p]) |
| ok2 = false; |
| } |
| if (ok1 && ok2) |
| testPassed('Rendered ok with preserveDrawingBuffer ' + preserve +'.'); |
| else |
| testFailed('Did not render ok with preserveDrawingBuffer ' + preserve + '.'); |
| if (preserve) { |
| finishTest() |
| } else { |
| runTest(true); |
| } |
| } |
| |
| function runTest(preserve) { |
| var c1 = document.getElementById('c' + (preserve * 3 + 1)); |
| var c2 = document.getElementById('c' + (preserve * 3 + 2)); |
| var c3 = document.getElementById('c' + (preserve * 3 + 3)); |
| var ctx1 = c1.getContext('2d'); |
| var ctx2 = c2.getContext('2d'); |
| var gl = wtu.create3DContext(c3, { alpha:false, preserveDrawingBuffer:preserve }); |
| if (!gl) { |
| testFailed("context does not exist"); |
| if (preserve) { |
| finishTest() |
| } else { |
| runTest(true); |
| } |
| return; |
| } |
| gl.clearColor(1, 0, 0, 1); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| ctx1.drawImage(c3, 0, 0); |
| wtu.waitForComposite(function() { |
| ctx2.drawImage(c3, 0, 0); |
| checkResult(ctx1, ctx2, preserve); |
| }); |
| } |
| </script> |
| </head> |
| <body> |
| <div class="pattern"> |
| <canvas id='c1'></canvas> |
| <canvas id='c2'></canvas> |
| <canvas id='c3'></canvas> |
| </div> |
| <span>should look like</span> |
| <div class="pattern"> |
| <div class='square'></div> |
| <div class='square' style='background-color:black'></div> |
| <div class='square'></div> |
| </div> |
| <hr /> |
| <div class="pattern"> |
| <canvas id='c4'></canvas> |
| <canvas id='c5'></canvas> |
| <canvas id='c6'></canvas> |
| </div> |
| <span>should look like</span> |
| <div class="pattern"> |
| <div class='square'></div> |
| <div class='square'></div> |
| <div class='square'></div> |
| </div> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| "use strict"; |
| description('Verify that preserveDrawingBuffer attribute is honored.'); |
| runTest(false); |
| var successfullyParsed = true; |
| shouldBeTrue("successfullyParsed"); |
| </script> |
| </body> |
| </html> |
