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Uladzimir KarpenkaandClaude Opus 4.8
2a7bf8528a
The span-selector panel was rendered directly onto the spectrum canvas every frame via DrawSelf, doing ~30 TextWidth + ~11 TextOut Canvas calls. On Cocoa these text ops are very expensive (~10.6 ms/frame, ~30% of a core) and dominated DrawSpectrum. Render the panel once into a per-pixel-alpha cache bitmap and only composite it over the spectrum each frame; rebuild only when state changes (rate, hover, hidden, bounds). The cache is built with the two-background method (render over black and white, derive straight alpha + color) so layered semi-transparent button fills and antialiased text composite over the live spectrum exactly as before. Cuts the overlay phase from ~10.6 ms to ~0.2 ms per frame; DrawSpectrum drops ~13.8 ms -> ~2.7 ms. Mirrors the caching VfoOverlay already uses. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>