[BobClawblaw]

WebP images now decode, so every vision family on the shared picture decoder serves them: the Qwen-VL tower (Qwen3.8-27B, Flash Next), GLM, Nemotron's RADIO and LFM2. Until now the server refused them by name.

What changes

• core/picture/webp.zig loads one pinned libwebp decoder, 1.6.0 (libwebpdecoder, the release Pillow 13.0.0 bundles), at the first WebP. It is found and refused the way jpeg.zig finds libturbojpeg:
  • the file TENSORFOLD_LIBWEBP names, then lib/ beside the server's folder, beside the server, Homebrew's webp, then the loader's path;
  • another release is refused by name (WebPGetDecoderVersion), and so is a missing library.
  • TensorFold neither includes nor ships the library.
• Decoding:
  • The RIFF chunks are read first: an animated file is refused as animated pictures are, and the EXIF and XMP chunks give the orientation.
  • Then WebPDecodeRGBAInto, and core's finish: EXIF-oriented, alpha over white, as PNG and JPEG.
• The server's gate (server/images.zig) admits WebP. Refusals now name PNG, JPEG or WebP. picture.problem loses its unused bytes parameter.
• Tests:
  • zig/tests/fixtures/picture/webp.json, from tools/zig/picture_webp_fixtures.py, holds eight files and the RGB bytes Pillow 13.0.0 gives them: lossy, lossless, both with alpha, 1x1, an EXIF orientation 6, an animated file and a cut one.
  • Without the library the pixel cases skip, as the JPEG cases do.
  • tools/zig/vision_served.py checks that a WebP answers, that a lossless WebP named after a PNG gives that PNG's reply, and that a damaged WebP is refused.
• Docs: docs/vision.md, THIRD_PARTY_NOTICES.md (libwebp, BSD-3-Clause).

Checks (M5 Ultra):

• Decoder against Pillow: libwebp 1.6.0 gives Pillow 13.0.0's RGBA bytes on lossy, lossless and alpha files. All eight fixture cases match Pillow's outcome: bit-identical RGB, or the same refusal.
• Served (Qwen3.8 Flash Next 6-bit, --vision --vision-urls, the same commit stacked on Flash Next: images and video on native Metal, and warm passes that keep nothing skipped (stacked on #606) #986):
  • vision_served.py passes. A Pillow q75 WebP photo answers, a lossless WebP gives its PNG's reply, and a damaged WebP and a GIF are refused.
  • The one failure there is the case that needs a server without --vision-urls.
  • A WebP fetched by URL (https://www.gstatic.com/webp/gallery/1.webp) is described correctly.
  • The recipe's image gate passes 11 of 11, a lossless WebP giving its PNG's reply and a lossy one counting five dots.
• Repo checks: zig build test with the library and without it, test-kernel-contract, test-golden, fuzz-cortheon, zig fmt --check and the lean check (no new problems against main) pass.

[cwschroeder]

Reviewed the single commit cf989a39; no material source issue found in the WebP loader, RIFF bounds, allocation cleanup, orientation/alpha finishing or format wiring.

With the existing pinned libwebp 1.6.0, the actual picture tests pass 16/16 in both Zig 0.17.0 Debug and Fast, including all eight WebP fixture outcomes. Additional CPU controls and receipts pass for a missing library, a synthetic wrong version and missing symbols; both Zig output-allocation failure points; 12,582 prefix cuts and 24 RIFF-size changes with six full positive controls. No trap or allocator leak was observed. Whole-tree formatting and patch whitespace pass; all four current-head CI checks are green.

Coverage limits: JPEG pixel subcases were excluded because the local JPEG library differs from its separate pin. The WebP pixels match the submitted Pillow 13 fixture table; I did not rebuild an independent Pillow 13 oracle or rerun the author-reported served vision/model checks. No Metal/model execution or repository changes here.

[ashhart]

Thank you, @BobClawblaw, for WebP support and the lossless/lossy, alpha and orientation fixtures.

We merged your work for 1.1.0 in 6e1ca30, through the existing picture API, processors and towers. libwebp 1.6.0 is an optional, version-checked runtime load; TensorFold ships no copy and refuses WebP clearly when the decoder is unavailable or incompatible.

Host decoder/refusal checks passed; a final libwebp 1.6.0 image/alpha/EXIF device-fixture run is not separately recorded.

Posted by Ash's AI Assistant Synthena