[HttpKiwi]

On niri (Wayland, 1920x1080 at scale 1) the desktop viewer took around 4 s from a click to the settings drawer opening, and its text and rounded UI looked jagged. This fixes both.

Responsiveness

• Native Wayland on every Wayland session except GNOME. sdl2-compat still prefers X11, so outside KDE the viewer ran under XWayland (xwayland-satellite on niri). GNOME still gets SDL's default. An explicit SDL_VIDEODRIVER / SFT_VIDEO_DRIVER / --video-driver still wins, and the existing fallback stays in place.
• Redraws are merged per batch of events. app_events redrew the home screen or drawer, and waited for vsync, on every event, mouse moves included. A high-polling-rate mouse queued up seconds of presents ahead of a click: app_events measured up to 2.3 s per call. Redraws requested while handling events now set a flag and run once after the queue is empty, which brought the worst case to 4.5 ms. During a Win32 live resize (g_in_size_move) it still draws immediately.

Crisp text and shapes

The UI drew everything from bitmaps made at one size and bilinear-scaled: a 32/56 px font atlas drawn at 11–20 px, and a 96 px disc and icons drawn at radius 4–20 px. At 3–8× minification that skips texels and comes out jagged.

• Text: rasterized by stb_truetype v1.26 (vendored in third_party/stb, MIT or public domain) at the exact on-screen pixel size, from DejaVu Sans and Bold subset to ASCII and embedded (24 KB). Glyphs are cached, placed at quarter-pixel positions, kerned, and copied texel for texel. The size is computed in device pixels, so the scaled stats overlay and HiDPI windows stay sharp. font_dejavu.h goes from 188 KB to 69 KB, and gen_font.py now only subsets and embeds the fonts.
• Rounded rects, pills and knobs: anti-aliased geometry (SDL_RenderGeometry, a 1 px fading edge) at any size.
• Gear and pin icons: rasterized at their pixel size (same shape functions, 4×4 coverage) and cached by that size.
• The text_draw / text_width / ui_rrect signatures are unchanged, so callers didn't change.
• The Windows, macOS and portable Linux packaging scripts copy stb_truetype's licence into licenses/.

Testing

• Built on Arch (sdl2-compat 2.32, gcc) with no new warnings.
• Home screen, settings drawer and stats overlay checked with --shot at 1896×1031 and 838×628 (0.85 UI density).
• tools/sft_stream_test.py: raw-view decoded all 40 packets with the expected single lost frame. The PyAV check couldn't run here (no av module).
• Not built or tested on Windows or macOS.

🤖 Generated with Claude Code

[TomasUribe]

Thanks! The coalesced redraws are a clear win. One blocker: SDL_RenderGetWindow (menu.h unit_xform) needs SDL 2.0.22, so make fails on Ubuntu 22.04 (SDL 2.0.20); g_paint_win holds the same window. The Windows cross-build compiles; could you (or someone) check the text on Windows and macOS before it goes in, since the font path is shared?