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63 lines
2.3 KiB
HTML
63 lines
2.3 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(bitmapCanvas, r, g, b, a)
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{
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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(bitmapCanvas, 0, 0);
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var color = myCtx.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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promise_test(function() {
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function testTransferFromImageBitmapNullability(greenImage, redImage) {
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var bitmapCanvas = new OffscreenCanvas(width,height);
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var bitmapCtx = bitmapCanvas.getContext('bitmaprenderer');
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bitmapCtx.transferFromImageBitmap(greenImage);
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// Make sure the bitmap renderer canvas is filled correctly.
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testCanvas(bitmapCanvas, 0, 255, 0, 255);
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// Test if passing null resets the bitmap renderer canvas.
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// Drawing the resetted canvas cannot change the destination canvas.
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bitmapCtx.transferFromImageBitmap(null);
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testCanvas(bitmapCanvas, 0, 0, 0, 0);
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// Test if we can redraw the bitmap canvas correctly after reset.
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bitmapCtx.transferFromImageBitmap(redImage);
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testCanvas(bitmapCanvas, 255, 0, 0, 255);
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}
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var greenCanvas = document.createElement('canvas');
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greenCanvas.width = width;
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greenCanvas.height = height;
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var greenCtx = greenCanvas.getContext('2d');
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greenCtx.fillStyle = '#0f0';
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greenCtx.fillRect(0, 0, width, height);
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var redCanvas = document.createElement('canvas');
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redCanvas.width = width;
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redCanvas.height = height;
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var redCtx = redCanvas.getContext('2d');
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redCtx.fillStyle = '#f00';
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redCtx.fillRect(0, 0, width, height);
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return Promise.all([
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createImageBitmap(greenCanvas),
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createImageBitmap(redCanvas),
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]).then(([greenImage, redImage]) => {
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testTransferFromImageBitmapNullability(greenImage, redImage);
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});
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},'Test that transferFromImageBitmap(null) discards the previously transferred image');
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</script>
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