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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
commit0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch)
treea31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /testing/web-platform/tests/png/trns-chunk.html
parentInitial commit. (diff)
downloadfirefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz
firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<!DOCTYPE html>
+<title>PNG test: tRNS chunk</title>
+<link rel="help" href="https://w3c.github.io/PNG-spec/#11tRNS">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<body>
+
+<h1>tRNS chunk handling</h1>
+<p class="desc">test ignored high bits on lower bit depth tRNS</p>
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("test ignored high bits on lower bit depth tRNS");
+const img = new Image();
+img.onload = () => {
+ _addTest(function(canvas, ctx) {
+ ctx.drawImage(img, 0, 0);
+
+ var pixel = ctx.getImageData(5, 5, 1, 1, {colorSpace: "srgb", storageFormat: "uint8"}).data;
+
+ const pixel_expected = [255, 0, 0, 0];
+ const epsilon = 2;
+
+ _assertSame(pixel.length, pixel_expected.length, "pixel.length", "pixel_expected.length");
+ // Ignore the color channel comparisons.
+ // The image itself stores 255 red, 0 green, 0 blue.
+ // But there may not be a requirement that this be preserved
+ // while decoding or through canvas processing.
+ assert_approx_equals(pixel[3], pixel_expected[3], epsilon);
+ });
+};
+img.src = "support/trns-high-bits-set.png";
+</script>