43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
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#pragma once
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#include <uzlib.h>
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#include <cstdint>
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#include "EpdFontData.h"
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class FontDecompressor {
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public:
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bool init();
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void deinit();
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// Returns pointer to decompressed bitmap data for the given glyph.
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// Valid until LRU eviction (safe for the duration of one glyph render).
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const uint8_t* getBitmap(const EpdFontData* fontData, const EpdGlyph* glyph, uint16_t glyphIndex);
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// Evict all cached decompressed groups (call between pages for within-page-only caching).
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void clearCache();
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private:
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static constexpr uint8_t CACHE_SLOTS = 4;
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struct CacheEntry {
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const EpdFontData* font = nullptr;
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uint16_t groupIndex = 0;
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uint8_t* data = nullptr;
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uint32_t dataSize = 0;
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uint32_t lastUsed = 0;
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bool valid = false;
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};
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struct uzlib_uncomp decomp = {};
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CacheEntry cache[CACHE_SLOTS] = {};
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uint32_t accessCounter = 0;
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void freeAllEntries();
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uint16_t getGroupIndex(const EpdFontData* fontData, uint16_t glyphIndex);
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CacheEntry* findInCache(const EpdFontData* fontData, uint16_t groupIndex);
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CacheEntry* findEvictionCandidate();
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bool decompressGroup(const EpdFontData* fontData, uint16_t groupIndex, CacheEntry* entry);
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};
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