ImageCapture-grabFrame.https.html (1497B)
1 <!DOCTYPE html> 2 <script src="/resources/testharness.js"></script> 3 <script src="/resources/testharnessreport.js"></script> 4 <body> 5 <canvas id='canvas0' width=10 height=10></canvas> 6 <canvas id='canvas1' width=10 height=10></canvas> 7 </body> 8 <script> 9 10 // This test verifies that ImageCapture can grabFrame()s. 11 12 var test = async_test(function() { 13 var canvas0 = document.getElementById('canvas0'); 14 var context0 = canvas0.getContext("2d"); 15 context0.fillStyle = "red"; 16 context0.fillRect(0, 0, 10, 10); 17 18 var stream = canvas0.captureStream(); 19 20 var capturer = new ImageCapture(stream.getVideoTracks()[0]); 21 22 capturer.grabFrame() 23 .then(bitmap => { 24 assert_equals(canvas0.width, bitmap.width); 25 assert_equals(canvas0.height, bitmap.height); 26 27 var context1 = document.getElementById('canvas1').getContext("2d"); 28 context1.drawImage(bitmap, 0, 0); 29 30 var imageData0 = context0.getImageData(0, 0, 10, 10); 31 var imageData1 = context1.getImageData(0, 0, 10, 10); 32 33 assert_equals(imageData0.width, imageData1.width); 34 assert_equals(imageData0.height, imageData1.height); 35 assert_equals(imageData0.data.length, imageData1.data.length); 36 for (var i = 0; i < imageData0.data.length; i++) 37 assert_approx_equals(imageData0.data[i], imageData1.data[i], 5); 38 39 this.done(); 40 }) 41 .catch(error => { 42 assert_unreached('Error during grabFrame(): '+ error); 43 }); 44 }, 'exercises the ImageCapture API creation and grabFrame().'); 45 46 </script>