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engine: add exact Windows GDI glyph backend

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gamer147
2026-07-30 18:35:46 -04:00
parent fe06618439
commit a58108522e
10 changed files with 679 additions and 7 deletions
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docs/engine-re.md
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@@ -2985,6 +2985,21 @@ callbacks for future native font handles; `CachedGlyphMaskRasterizer` applies th
core is not yet connected to ops `0x204`/`0x205`, live ADV, History, or Godot, so the Label backend and
visible behavior remain unchanged until the later integration steps.
The independent Windows reference backend landed alongside, but outside, the neutral engine as
`Age.Engine.Text.Windows.WindowsGdiGlyphMaskRasterizer`. It holds one `CreateICA("DISPLAY")` information
context and selects bounded, safely disposed `CreateFontIndirectA` objects carrying the requested negative
height/width, weight, `DEFAULT_CHARSET`, and raw CP932 face bytes. Each request preserves the original one-
or two-byte CP932 code for `GetGlyphOutlineA(GGO_GRAY4_BITMAP)` and `GetTextExtentPoint32A`; returned masks
flow through the same normalized `GlyphMask` contract without another pixel conversion.
This exact ANSI reference requires Windows system ACP 932. `TryGetAvailability` reports the active-platform/
code-page incompatibility and the constructor refuses to masquerade as exact when unavailable.
`GlyphRasterizerBackendInfo` identifies the backend as `windows-gdi-gray4`, native-CP932, and pixel-exact.
On the reference installation, three test requests—24px regular Mincho `あ`, 24px weight-700 Mincho `姫`,
and 16px weight-700 Gothic `ア`—match an independently created Unicode GDI font/DC call byte-for-byte in
coverage and exactly in black box, aligned stride, glyph origin, cell extent, and advance. The backend is
not wired into Godot yet, so this gate validates mask provenance without changing visible rendering.
#### ADV wait indicator -- ops `0x73` / `0x72` (2026-07-11)
The small bat marker is a configured ADV-layout sprite, not a glyph or part of SO001. `SYSTEM4.BIN`