2d.imageData.put.dirty.negative.html (1410B)
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.put.dirty.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.put.dirty.negative</h1> 10 <p class="desc">putImageData() handles negative-sized dirty rectangles correctly</p> 11 12 13 <script> 14 var t = async_test("putImageData() handles negative-sized dirty rectangles correctly"); 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 = '#f00'; 25 ctx.fillRect(0, 0, 100, 50) 26 ctx.fillStyle = '#0f0'; 27 ctx.fillRect(0, 0, 20, 20) 28 29 var imgdata = ctx.getImageData(0, 0, 100, 50); 30 31 ctx.fillStyle = '#0f0'; 32 ctx.fillRect(0, 0, 100, 50) 33 ctx.fillStyle = '#f00'; 34 ctx.fillRect(40, 20, 20, 20) 35 ctx.putImageData(imgdata, 40, 20, 20, 20, -20, -20); 36 37 _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2); 38 _assertPixelApprox(canvas, 35,25, 0,255,0,255, 2); 39 _assertPixelApprox(canvas, 65,25, 0,255,0,255, 2); 40 _assertPixelApprox(canvas, 50,15, 0,255,0,255, 2); 41 _assertPixelApprox(canvas, 50,45, 0,255,0,255, 2); 42 t.done(); 43 44 }); 45 </script>