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36 lines
748 B
HTML
36 lines
748 B
HTML
<!DOCTYPE html>
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<html>
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<meta charset="utf-8">
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<title>Reference for Bug 1972885</title>
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<style>
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body {
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margin: 0;
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}
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canvas {
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/* Rounded up. */
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margin-top: 2px;
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width: 100px;
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/* Subpixel snapped down. */
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height: 100px;
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}
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</style>
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<canvas id="canvas"></canvas>
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<script>
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function draw(canvas, width, height) {
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const ctx = canvas.getContext('2d');
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canvas.width = width;
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canvas.height = height;
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const imgData = ctx.createImageData(width, height);
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const u32View = new Uint32Array(imgData.data.buffer);
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u32View.fill(0xFFFFFFFF);
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for (let y = 0; y < height; y += 2) {
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for (let x = 0; x < width; x++) {
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u32View[y * width + x] = 0xFF000000;
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}
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}
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ctx.putImageData(imgData, 0, 0);
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}
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draw(canvas, 100, 100);
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</script>
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