2d.imageData.get.source.negative.html (2107B)
1 <!DOCTYPE html> 2 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> 3 <meta charset="UTF-8"> 4 <title>OffscreenCanvas test: 2d.imageData.get.source.negative</title> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script src="/html/canvas/resources/canvas-tests.js"></script> 8 9 <h1>2d.imageData.get.source.negative</h1> 10 <p class="desc">getImageData() works with negative width and height, and returns top-to-bottom left-to-right</p> 11 12 13 <script> 14 var t = async_test("getImageData() works with negative width and height, and returns top-to-bottom left-to-right"); 15 var t_pass = t.done.bind(t); 16 var t_fail = t.step_func(function(reason) { 17 throw reason; 18 }); 19 t.step(function() { 20 21 var canvas = new OffscreenCanvas(100, 50); 22 var ctx = canvas.getContext('2d'); 23 24 ctx.fillStyle = '#000'; 25 ctx.fillRect(0, 0, 100, 50); 26 ctx.fillStyle = '#fff'; 27 ctx.fillRect(20, 10, 60, 10); 28 29 var imgdata1 = ctx.getImageData(85, 25, -10, -10); 30 _assertSame(imgdata1.data[0], 255, "imgdata1.data[\""+(0)+"\"]", "255"); 31 _assertSame(imgdata1.data[1], 255, "imgdata1.data[\""+(1)+"\"]", "255"); 32 _assertSame(imgdata1.data[2], 255, "imgdata1.data[\""+(2)+"\"]", "255"); 33 _assertSame(imgdata1.data[3], 255, "imgdata1.data[\""+(3)+"\"]", "255"); 34 _assertSame(imgdata1.data[imgdata1.data.length-4+0], 0, "imgdata1.data[imgdata1.data.length-4+0]", "0"); 35 _assertSame(imgdata1.data[imgdata1.data.length-4+1], 0, "imgdata1.data[imgdata1.data.length-4+1]", "0"); 36 _assertSame(imgdata1.data[imgdata1.data.length-4+2], 0, "imgdata1.data[imgdata1.data.length-4+2]", "0"); 37 _assertSame(imgdata1.data[imgdata1.data.length-4+3], 255, "imgdata1.data[imgdata1.data.length-4+3]", "255"); 38 39 var imgdata2 = ctx.getImageData(0, 0, -1, -1); 40 _assertSame(imgdata2.data[0], 0, "imgdata2.data[\""+(0)+"\"]", "0"); 41 _assertSame(imgdata2.data[1], 0, "imgdata2.data[\""+(1)+"\"]", "0"); 42 _assertSame(imgdata2.data[2], 0, "imgdata2.data[\""+(2)+"\"]", "0"); 43 _assertSame(imgdata2.data[3], 0, "imgdata2.data[\""+(3)+"\"]", "0"); 44 t.done(); 45 46 }); 47 </script>