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75 lines
2.7 KiB
HTML
75 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>Canvas's ImageBitmapRenderingContext test</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#the-imagebitmap-rendering-context">
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<script>
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var width = 10;
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var height = 10;
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function testCanvas(ctx, r, g, b, a)
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{
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var color = ctx.getImageData(5, 5, 1, 1).data;
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assert_array_equals(color, [r, g, b, a]);
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}
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function consumeImageBitmap(image, alphaVal, expectedR, expectedG, expectedB, expectedA)
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{
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var dstCanvas = document.createElement('canvas');
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dstCanvas.width = width;
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dstCanvas.height = height;
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var dstCtx;
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if (alphaVal == 'true')
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dstCtx = dstCanvas.getContext('bitmaprenderer', { alpha: true });
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else if (alphaVal == 'false')
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dstCtx = dstCanvas.getContext('bitmaprenderer', { alpha: false });
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else
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dstCtx = dstCanvas.getContext('bitmaprenderer');
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dstCtx.transferFromImageBitmap(image);
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var myCanvas = document.createElement('canvas');
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myCanvas.width = width;
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myCanvas.height = height;
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var myCtx = myCanvas.getContext('2d');
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myCtx.drawImage(dstCanvas, 0, 0);
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testCanvas(myCtx, expectedR, expectedG, expectedB, expectedA);
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}
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promise_test(function() {
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var srcCanvas = document.createElement('canvas');
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srcCanvas.width = width;
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srcCanvas.height = height;
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var ctx = srcCanvas.getContext('2d');
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ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
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ctx.fillRect(0, 0, width, height);
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return createImageBitmap(srcCanvas).then(function(image) {
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consumeImageBitmap(image, 'false', 0, 127, 0, 255);
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});
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}, "Test that an ImageBitmapRenderingContext with alpha disabled makes the canvas opaque");
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promise_test(function() {
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var srcCanvas = document.createElement('canvas');
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srcCanvas.width = width;
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srcCanvas.height = height;
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var ctx = srcCanvas.getContext('2d');
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ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
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ctx.fillRect(0, 0, width, height);
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return createImageBitmap(srcCanvas).then(function(image) {
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consumeImageBitmap(image, 'true', 0, 255, 0, 127);
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});
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}, "Test that an ImageBitmapRenderingContext with alpha enabled preserves the alpha");
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promise_test(function() {
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var srcCanvas = document.createElement('canvas');
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srcCanvas.width = width;
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srcCanvas.height = height;
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var ctx = srcCanvas.getContext('2d');
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ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
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ctx.fillRect(0, 0, width, height);
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return createImageBitmap(srcCanvas).then(function(image) {
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consumeImageBitmap(image, '', 0, 255, 0, 127);
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});
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}, "Test that the 'alpha' context creation attribute is true by default");
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</script>
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