HTMLCanvasElement-getImageData-noframe.html (987B)
1 <!DOCTYPE html> 2 <html> 3 <body> 4 <canvas id="canvas"></canvas> 5 <script src=/resources/testharness.js></script> 6 <script src=/resources/testharnessreport.js></script> 7 <script> 8 promise_test(async t => { 9 const canvas = document.getElementById("canvas"); 10 const ctx = canvas.getContext("2d"); 11 const stream = canvas.captureStream(); 12 t.add_cleanup(() => stream.getTracks().forEach(track => track.stop())); 13 14 const video = document.createElement("video"); 15 video.srcObject = stream; 16 17 ctx.getImageData(0, 0, canvas.width, canvas.height); 18 19 assert_equals(video.readyState, video.HAVE_NOTHING, 20 "Video element was just created"); 21 22 // Wait a bit so the video element can update readyState in case of a frame. 23 await new Promise(r => t.step_timeout(r, 100)); 24 25 assert_equals(video.readyState, video.HAVE_NOTHING, 26 "Video element did not get a frame from the canvas"); 27 }, "CanvasRenderingContext2D.getImageData() does not lead to a frame being captured"); 28 </script> 29 </body> 30 </html>