As of Firefox 157 I intend to move JPEG XL decoding connected by default connected each platforms. It has been developed down image.jxl.enabled, which coming is connected by default connected Nightly only, and has had a Firefox Labs checkbox connected each transmission since 152. The decoder is jxl-rs, successful Rust.
Bug to move connected by default: https://bugzilla.mozilla.org/show_bug.cgi?id=2065096
Standard: ISO/IEC 18181, https://www.iso.org/standard/85066.html
Standards body: ISO/IEC
Platform coverage: all
Preference: image.jxl.enabled
Standards position: https://github.com/mozilla/standards-positions/issues/522 (neutral)
TAG review: https://github.com/w3ctag/design-reviews/issues/633 (satisfied pinch concerns)
Intent to prototype: https://groups.google.com/a/mozilla.org/d/msgid/dev-platform/53b4e3e0-5eee-4768-a1ba-b069e1e85244n%40mozilla.org
Other browsers: Safari shipped successful 17.0 successful 2023. Chrome has it down #enable-jxl-image-format utilizing the aforesaid Rust library, nary intent to vessel yet.
Changes since the intent to prototype:
Performance was a interest raised connected the intent to prototype thread. jxl-rs 0.6.0 was released pinch multithreaded decoding support, and our patches to hook up and alteration multithreaded decoding are expected to onshore soon. Including those patches, I ran a five-format decode benchmark complete the aforesaid pictures astatine a scope of sizes: we were somewhat up of Safari (using C++ libjxl) connected my machine. Compared to our different image format decoders, JXL is adjacent connected ample images, but shows a bigger spread connected mini ones.
It has characteristic parity pinch our different image formats and pinch Blink's JXL implementation, including animation and progressive display. The 1 objection is HDR: HDR images show arsenic SDR, the aforesaid arsenic each different format we support, but our reside mapping for JXL is overmuch amended than what we do for different image formats. Safari has neither progressive rendering nor animation.
The wpt jpegxl directory covers decode correctness crossed spot depths, alpha, grayscale, CMYK, colour management, predisposition and the coding tools, positive the HTML and CSS ways an image gets used. Where wpt could not definitive thing I added gecko tests: astir 30 gtests for chunked and incremental decoding, animation framework counts, downscale during decode and corrupt files, mochitests for progressive rendering and telemetry, reftests, and decode benchmarks that study to Perfherder. The fuzzing squad already fuzzed jxl earlier it was enabled connected nightly and they will fuzz the decoder again earlier I flip the pref.
Timothy Nikkel
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