[meee1]

Summary

• HUD (GDI/shared): cache glyph lookups (TryGetValue), reuse the wings pen, point arrays and pre-arm font instead of allocating per frame, and skip heading-tape degrees that draw nothing.
• HUD (OpenGL): replace GL.Begin/End and per-call arrays with one interleaved vertex array drawn from a streamed VBO (client arrays on a pre-1.5 driver). Consecutive same-width lines and consecutive strings merge into single draw calls; draw order is unchanged because any other call flushes the batch.
• HUD (OpenGL): one 1024x1024 glyph atlas replaces a texture, bind and draw call per character. Rebuilt on resize and when full.
• HUD video: upload the background texture only when bgimage was set since the last upload; the video and the cached status icons each get their own texture so they no longer re-allocate each other's.
• GMap: don't clone the route pen on every render (dispose it when a custom dash needs a copy), dispose the decoded frame image in the Skia path, cache the scale-bar brush.

Testing

Not built or run yet. To check on a Windows build with SITL:

• HUD text, line widths, gradients and tape draw order look unchanged in GL mode and in GDI mode
• the HUD <n> hz drawtime <ms> gl <bool> console line before and after
• video behind the HUD still updates, and icons still show
• resize the HUD and the atlas rebuilds without garbled text

🤖 Generated with Claude Code

[meee1]

Notes from a review pass. The diff reads correctly and CI is green, but the description says it hasn't been run yet, so this should be held until the manual test list has been done on both GL and GDI.

Open questions:

• GMapRoute no longer clones the shared pen. GDI+ Pen objects aren't thread-safe, so concurrent rendering could throw "object is currently in use elsewhere".
• There is a ~4 MB allocation on every resize.
• FillPolygon(Brush, PointF[]) changed from Quads to TriangleFan. That's equivalent for convex quads but differs for callers passing more than 4 points, so it belongs on the visual checklist.

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Generated by Claude Code