Follow-on to the HALFTONE->COLORONCOLOR fix. BTGlassPanels_Tick repainted all 7
glass windows every ~16 Hz pump unconditionally. Now each window carries a change
token and the pump re-blits ONLY the windows whose token differs:
token = FNV-1a checksum of the shared gauge pixelBuffer masked to the bits this
window can show (SVGA16::PlaneChecksum over primary + Eng-twin + RGB-group
ports) combined with each button's RENDERED lamp brightness + held/latch.
Folding the flash BRIGHTNESS (not the raw lamp state) into the token means a flashing
lamp repaints exactly when it toggles; a static panel or an idle cockpit skips its
expand + StretchDIBits entirely. The masked checksum reads the RENDERED RESULT of the
gauges' values, so it catches everything -- discrete value gauges, the continuous
radar sweep, any imagery -- with no gauge->port->window plumbing and no risk of a
frozen display (full pass, no stride; collision-free in practice).
Measured (dev box, solo mission, BT_GLASS_DIRTY): ~31 pumps/2s -> 4-15 window-repaints
vs 217-224 always-on (~15-40x fewer); avg frame work 3.3 -> 0.93ms. BT_GLASS_DIRTY=1
logs the repaint tally.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
CydandClaude Opus 4.8
c9e25e59c5