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https://github.com/servo/servo.git
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41 lines
1.7 KiB
HTML
41 lines
1.7 KiB
HTML
<!DOCTYPE html>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/common/canvas-tests.js"></script>
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<link rel="help" href="https://html.spec.whatwg.org/#offscreencontext2d-commit">
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<script>
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function verifyPlaceholder(placeholder, expectedR, expectedG, expectedB, expectedA, expectedClrStr)
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{
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var canvas = document.createElement('canvas');
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canvas.width = canvas.height = 10;
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var ctx = canvas.getContext('2d');
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ctx.drawImage(placeholder, 0, 0);
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_assertPixel(canvas, 5,5, expectedR, expectedG, expectedB, expectedA, "5,5", expectedClrStr);
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}
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test(function() {
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var placeholder = document.createElement('canvas');
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placeholder.width = placeholder.height = 10;
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var offscreenCanvas = placeholder.transferControlToOffscreen();
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var ctx = offscreenCanvas.getContext('2d');
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ctx.fillStyle = "#0f0";
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ctx.fillRect(0, 0, 10, 10);
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// commit() propagation is taken care of by an async task, which means the
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// place holder contents should still be transparent black at this moment.
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verifyPlaceholder(placeholder, 0,0,0,0, "0,0,0,0");
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// Set timeout acts as a sync barrier to allow commit to propagate
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setTimeout(function() {
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verifyPlaceholder(placeholder, 0,255,0,255, "0,255,0,255");
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}, 0);
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}, "Test that calling OffscreenCanvas's commit pushes its contents to its placeholder.");
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test(function() {
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var offscreenCanvas = new OffscreenCanvas(10, 10);
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var ctx = offscreenCanvas.getContext('2d');
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ctx.fillStyle = "#0f0";
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ctx.fillRect(0, 0, 10, 10);
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ctx.commit();
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}, "Test that calling commit on an OffscreenCanvas that is not transferred from a HTMLCanvasElement is a noop.");
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</script>
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