forked from unom/punktfunk
Transcoding every image to PNG was the Phase-1 floor, but it bloats lossy originals (a copied JPEG re-encoded lossless is 5-10x the bytes for zero quality gain — feeding the render-timeout on constrained links) and flattens GIFs to one frame. The wire already carries kind LISTS, so offer the original format beside the portable fallback and let the destination pick: - New wire kinds image/jpeg + image/gif (§3.5 extension; strings only, no protocol change). image/png stays the universal floor every peer accepts. - macOS: public.jpeg / com.compuserve.gif rows pass through verbatim both directions; the PNG floor is announced whenever any image is present. - Windows: registered JFIF/GIF formats read + promised verbatim; every image offer still promises CF_DIB, whose delayed render now fetches the richest offered kind (png > jpeg > gif) through the generalized image_to_dib. - Linux maps gain the matching rows (native MIME pass-through). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>