feat(clipboard): pass original JPEG/GIF through verbatim beside the PNG floor

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>
2026-07-17 19:32:03 +02:00
parent bbe4380b41
commit f4b52d0bf5
6 changed files with 198 additions and 21 deletions
@@ -22,7 +22,7 @@ quinn = "0.11"
 tokio = { version = "1", features = ["rt", "rt-multi-thread", "sync", "time", "macros"] }
 # CF_DIB <-> PNG conversion (winfmt) - most Windows apps paste bitmaps, not the "PNG" format.
 # Unconditional (not windows-gated) so winfmt's pure-conversion unit tests run on every host.
-image = { version = "0.25", default-features = false, features = ["png", "bmp"] }
+image = { version = "0.25", default-features = false, features = ["png", "bmp", "jpeg", "gif"] }

 [target.'cfg(target_os = "linux")'.dependencies]
 # Mutter's direct RemoteDesktop clipboard is raw D-Bus via `ashpd::zbus` — NOT the xdg