Subj : src/conio/bitmap_con.c
To   : Git commit to main/sbbs/master
From : Deuc¨
Date : Tue Mar 17 2026 00:41:05

https://gitlab.synchro.net/main/sbbs/-/commit/e0b825c458da099f74f1fc6d
Modified Files:
	src/conio/bitmap_con.c
Log Message:
Pre-compute Prestel double-height row states once per frame

calc_charstate() was scanning all rows 0..ypos-1 for every cell to
determine top/bottom double-height status, making full redraws
O(rows^2 * cols). Pre-compute the row state array once in
update_from_vmem() and pass it through the call chain. Callers from
bitmap_setpixel/setpixels pass NULL to retain the existing per-cell
scan (always single-cell, so the old path is fine).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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