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Add minimal allback buffer for future use

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This commit is contained in:
jpirnay
2026-05-04 16:44:28 +02:00
parent aeafe42348
commit 7a0dc31c2f
2 changed files with 51 additions and 5 deletions
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lib/EpdFont/FontDecompressor.h
+15 -3
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@@ -41,6 +41,10 @@ class FontDecompressor {
uint32_t peakTempBytes = 0; // largest temp buffer in prewarm or getBitmap miss
uint32_t getBitmapTimeUs = 0; // cumulative getBitmap time (micros)
uint32_t getBitmapCalls = 0; // number of getBitmap calls
// LRU specific stats
uint32_t fallbackCacheHits = 0;
uint32_t fallbackCacheMisses = 0;
};
void logStats(const char* label = "FDC");
void resetStats();
@@ -68,10 +72,18 @@ class FontDecompressor {
uint8_t pageSlotCount = 0;
static constexpr uint16_t HOT_GLYPH_BUF_SIZE = 512; // largest packed single glyph
static constexpr uint8_t FALLBACK_CACHE_SLOTS = 1;
// Scratch buffer for compacting a single glyph after a getBitmap() miss.
// Valid until the next getBitmap() call.
uint8_t _hotGlyphBuf[HOT_GLYPH_BUF_SIZE] = {};
struct FallbackSlot {
const EpdFontData* fontData;
uint32_t glyphIndex;
uint32_t lastUsedTick;
uint8_t buffer[HOT_GLYPH_BUF_SIZE];
};
// LRU cache for fallback glyph decompresion
FallbackSlot _fallbackCache[FALLBACK_CACHE_SLOTS] = {};
uint32_t _fallbackTick = 0;
void freePageBuffer();
uint16_t getGroupIndex(const EpdFontData* fontData, uint32_t glyphIndex);