firefox-main/testing/web-platform/tests/html/canvas/element/manual/draw-element-image/privacy/box-mask-png-ignored-tentative.https.sub.html

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Test Info: Warnings

  • This test has a WPT meta file that expects 1 subtest issues.
  • This WPT test may be referenced by the following Test IDs:
<!DOCTYPE HTML>
<html>
<head>
<title>drawElementImage does not use cross-origin mask images</title>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src='/html/canvas/resources/canvas-tests.js'></script>
<script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
<style>
#child {
width: 100px;
height: 200px;
background: green;
}
#sameOrigin {
position: absolute;
left: 0px;
top: 0px;
width: 100px;
height: 100px;
background-color: blue;
}
#crossOrigin {
position: absolute;
left: 0px;
top: 100px;
width: 100px;
height: 100px;
background-color: red;
}
</style>
</head>
<body>
<canvas id=canvas width="100" height="200" layoutsubtree>
<div id=child>
<div id=sameOrigin></div>
<div id=crossOrigin></div>
</div>
</canvas>
<script>
window.onload = () => {
promise_test(async function(t) {
await waitForCanvasPaint(canvas);
const context = canvas.getContext("2d");
context.drawElementImage(child, 0, 0);
// Fetch all pixel data once to avoid multiple slow readbacks.
const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
let pixel = _getPixelFromImageData(imgData, 50, 25);
assert_array_equals(pixel, [0, 128, 0, 255], "Same origin should draw");
pixel = _getPixelFromImageData(imgData, 50, 75);
assert_array_equals(pixel, [0, 0, 255, 255], "Same origin should draw");
// Missing mask image renders as black, blocking the red background
pixel = _getPixelFromImageData(imgData, 50, 125);
assert_array_equals(pixel, [0, 128, 0, 255], "Cross origin should not draw");
pixel = _getPixelFromImageData(imgData, 50, 175);
assert_array_equals(pixel, [0, 128, 0, 255], "Cross origin should not draw");
});
}
</script>
</body>
</html>