Data now hits the screen immediately when it arrives — no artificial
delay. The render throttle (RenderTickMs, FLastRenderTick) is removed
entirely. ParseData and EndUpdate call FlipToScreen unconditionally;
callers control batching via BeginUpdate/EndUpdate.
Blink toggle no longer calls DirtyAll. New DirtyBlinkRows method only
marks the cursor row and rows containing blink cells, reducing blink
overhead from ~63ms (25 rows) to ~3ms (1-3 rows) on a 486. Cursor
ghost handling in FlipToScreen dirties the old cursor row when the
cursor moves between rows.
Constant mini-frame values (Stride, CellH, PixSeg, GlyphSeg) are
pushed once before the column loop instead of per-cell, saving 320
push instructions per row.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Rewrite RenderRow inner loop: split each glyph byte into two nibbles,
look up 4 pre-resolved palette bytes per nibble from a 64-byte table,
and write as word stores — zero branching in the hot path. Replace 25
per-row GlobalAlloc buffers with a single reusable buffer and move glyph
data into a GlobalAlloc'd block shared with the nibble table. All
arithmetic is 16-bit Word (no Longint). Uses mini-frame technique to
safely access local variables from inline ASM after DS/SI/DI clobber.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Build a monochrome font atlas at startup (BuildAtlas), then render
terminal cells by writing palette indices directly into 8bpp DIB row
buffers (RenderRow). Each dirty row reaches the screen via a single
SetDIBitsToDevice call instead of ~12 GDI calls (TextOut, SetTextColor,
SetBkColor, BitBlt). This reduces per-frame GDI overhead by ~10x,
targeting smooth playback of BBS door games on Win16.
Key changes:
- TTermCell FG/BG from TColor to Byte (palette index 0-15)
- Font atlas: render 256 CP437 glyphs into monochrome bitmap, extract
per-glyph pixel masks via GetBitmapBits
- Per-row 8bpp DIB buffers via GlobalAlloc replace dual memory DCs
- RenderRow: zero-GDI atlas lookup + byte writes with cursor overlay
- FlipToScreen: ScrollDC on screen only, SetDIBitsToDevice per dirty row
- Text blink via FTextBlinkOn + re-render replaces dual-buffer phase swap
- Removed: CreateBuffers, DestroyBuffers, PaintLine, ClearBufRect,
RedrawBuffers, DrawRow, FBufDC/FBufBmp/FBlinkPhase fields
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-26 23:21:22 -06:00
1 changed files with 687 additions and 478 deletions
