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Add JPEG XL interop-2026 coverage and decoder tests
Introduce automated interop WPT coverage and strengthen Blink JXL decoder unit tests for orientation, ICC/CMYK, and high bit-depth fixtures. Bug: 484065185 Change-Id: Ie5f33c477b616e03b3f3a21d006c6ae1da09294e Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7572466 Commit-Queue: Philip Jägenstedt <foolip@chromium.org> Reviewed-by: Philip Jägenstedt <foolip@chromium.org> Cr-Commit-Position: refs/heads/main@{#1598968}
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‎jpegxl/alpha-modular-reftest-ref.html‎

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<!DOCTYPE html>
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<img src="resources/3x3a_srgb_lossless.png">

‎jpegxl/alpha-modular-reftest.html‎

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<!DOCTYPE html>
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<link rel="help" href="https://github.com/web-platform-tests/interop-jpegxl">
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<link rel="match" href="alpha-modular-reftest-ref.html">
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<meta name="assert" content="Alpha-bearing modular JPEG XL decode should match PNG reference output.">
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<img src="resources/3x3a_srgb_lossless.jxl">

‎jpegxl/alpha-vardct.html‎

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<!DOCTYPE html>
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<title>JPEG XL: alpha with VarDCT-oriented fixture</title>
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<link rel="help" href="https://github.com/web-platform-tests/interop-jpegxl">
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<meta name="assert" content="Decodes alpha-bearing fixture and verifies transparency exists.">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="resources/helpers.js"></script>
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<script>
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promise_test(async () => {
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const img = await loadImage('resources/conformance_alpha_nonpremultiplied.jxl');
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const px = samplePixel(img, 10, 10);
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assert_less_than(px[3], 255, 'fixture should include transparent pixels');
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}, 'Alpha channel is preserved for high bit-depth fixture.');
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</script>

‎jpegxl/basic-decode-reftest-ref.html‎

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<!DOCTYPE html>
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<img src="resources/basic.png">

‎jpegxl/basic-decode-reftest.html‎

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<!DOCTYPE html>
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<link rel="help" href="https://github.com/web-platform-tests/interop-jpegxl">
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<link rel="match" href="basic-decode-reftest-ref.html">
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<meta name="assert" content="Minimal 1x1 JPEG XL decode should match PNG reference output.">
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<img src="resources/basic.jxl">

‎jpegxl/bitdepth-10bpc-reftest-ref.html‎

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<img src="resources/conformance_sunset_logo.png">

‎jpegxl/bitdepth-10bpc-reftest.html‎

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<!DOCTYPE html>
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<link rel="help" href="https://github.com/web-platform-tests/interop-jpegxl">
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<link rel="match" href="bitdepth-10bpc-reftest-ref.html">
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<meta name="assert" content="10-bit JPEG XL decode should match PNG reference output.">
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<img src="resources/conformance_sunset_logo.jxl">

‎jpegxl/bitdepth-12bpc-reftest-ref.html‎

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<!DOCTYPE html>
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<img src="resources/conformance_alpha_nonpremultiplied.png">

‎jpegxl/bitdepth-12bpc-reftest.html‎

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<!DOCTYPE html>
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<link rel="help" href="https://github.com/web-platform-tests/interop-jpegxl">
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<link rel="match" href="bitdepth-12bpc-reftest-ref.html">
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<meta name="fuzzy" content="maxDifference=0-1; totalPixels=0-100000">
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<meta name="assert" content="12-bit JPEG XL decode should match PNG reference output.">
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<img src="resources/conformance_alpha_nonpremultiplied.jxl">

‎jpegxl/bitdepth-16bpc-reftest-ref.html‎

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<img src="resources/has_permutation.png">

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