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perf: Port upstream font drawing performance optimization (PR #978)

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Cherry-pick upstream commit 07d715e which refactors renderChar and
drawTextRotated90CW into a template-based renderCharImpl, hoisting
the is2Bit branch outside inner pixel loops for 15-23% speedup.

Additionally extends the template with Rotated90CCW to fix two bugs
in the mod's drawTextRotated90CCW: operator precedence in bmpVal
calculation and missing compressed font support via getGlyphBitmap.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
cottongin
2026-02-19 22:20:44 -05:00
parent ad282cadfe
commit 3a0641889f
2 changed files with 142 additions and 193 deletions
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6
lib/GfxRenderer/GfxRenderer.h
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@@ -38,10 +38,9 @@ class GfxRenderer {
uint8_t* bwBufferChunks[BW_BUFFER_NUM_CHUNKS] = {nullptr};
std::map<int, EpdFontFamily> fontMap;
FontDecompressor* fontDecompressor = nullptr;
void renderChar(const EpdFontFamily& fontFamily, uint32_t cp, int* x, const int* y, bool pixelState,
void renderChar(const EpdFontFamily& fontFamily, uint32_t cp, int* x, int* y, bool pixelState,
EpdFontFamily::Style style) const;
void freeBwBufferChunks();
const uint8_t* getGlyphBitmap(const EpdFontData* fontData, const EpdGlyph* glyph) const;
template <Color color>
void drawPixelDither(int x, int y) const;
template <Color color>
@@ -136,6 +135,9 @@ class GfxRenderer {
void restoreBwBuffer(); // Restore and free the stored buffer
void cleanupGrayscaleWithFrameBuffer() const;
// Font helpers
const uint8_t* getGlyphBitmap(const EpdFontData* fontData, const EpdGlyph* glyph) const;
// Low level functions
uint8_t* getFrameBuffer() const;
static size_t getBufferSize();