DanS 923d086092 feat(images): WebP decode via libwebp + more stb formats ...

Broaden avatar/image support:

- Add libwebp (FetchContent, static, decode-only) so WebP loads. Built from
  source for Linux / mingw-Windows / macOS-osxcross identically — the cross
  sysroots have no webp, so vendoring from source is the one portable path;
  encode/tool builds are disabled to avoid pulling in libpng/zlib. Linked as
  webp + webpdemux (the latter for animated WebP, wired next).
- texture_loader routes all decode through DecodeImageRGBA: sniffs the RIFF/
  WEBP header and uses libwebp (WebPDecodeRGBAInto into a free()-able buffer),
  else stb — so every existing caller (avatars, QR, thumbnails) gains WebP for
  free with no allocator mismatch.
- Enable stb's TGA / PSD / PNM / PIC decoders and add .webp/.tga/.psd/.pnm/
  .ppm/.pgm/.pic to the image-picker + avatar-library extension lists.

Verified: libwebp builds static and a real .webp decodes to correct RGBA.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-07-15 10:57:01 -05:00

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