test_bug389366.html (1682B)
1 <!DOCTYPE HTML> 2 <html> 3 <!-- 4 https://bugzilla.mozilla.org/show_bug.cgi?id=389366 5 --> 6 <head> 7 <title>Test for Bug 389366</title> 8 <script src="/tests/SimpleTest/SimpleTest.js"></script> 9 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> 10 </head> 11 <body> 12 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=389366">Mozilla Bug 389366</a> 13 <p id="display"></p> 14 <div id="content" style="display: none"> 15 <h4>Canvas testcase</h4> 16 17 Canvas, with pixel set to #ff0000 at 50% opacity:<br> 18 <canvas id="canvas1" width="10" height="10"></canvas> 19 <br> 20 <canvas id="canvas2" width="10" height="10"></canvas> 21 22 </div> 23 <pre id="test"> 24 <script class="testbody" type="text/javascript"> 25 26 SimpleTest.waitForExplicitFinish(); 27 28 function test() 29 { 30 // Draw to canvas1 31 var canvas1 = document.getElementById("canvas1"); 32 var ctx1 = canvas1.getContext("2d"); 33 34 ctx1.globalAlpha = 0.502; 35 ctx1.fillStyle = "#FF0000"; 36 ctx1.fillRect(0, 0, 10, 10); 37 38 var data1 = ctx1.getImageData(0,0,1,1).data; 39 isDeeply(data1, [255, 0, 0, 128], "expected half-transparent red canvas 1"); 40 41 // half-transparent red 10x10 square 42 var imgData = ctx1.createImageData(10, 10); 43 var rgba = [ 255, 0, 0, 128 ]; 44 for (i = 0; i < 50; ++i) { 45 for (j = 0; j < 4; ++j) { 46 imgData.data[(i * 4) + j] = rgba[j]; 47 } 48 } 49 50 var canvas2 = document.getElementById("canvas2"); 51 var ctx2 = canvas2.getContext("2d"); 52 ctx2.putImageData(imgData, 0, 0); 53 54 var data2 = ctx2.getImageData(0,0,1,1).data; 55 isDeeply(data2, [255, 0, 0, 128], "expected half-transparent red canvas 2"); 56 57 SimpleTest.finish(); 58 } 59 60 addLoadEvent(test); 61 62 </script> 63 </pre> 64 </body> 65 </html>