Justin Mitchell
05c1e9aa46
Temporarily release framebuffer memory during section pagination to reduce heap pressure. The framebuffer can be released before memory-intensive operations and restored afterward, allowing BLE stack startup threshold to be lowered from 80KB to 70KB. Implements RAII-style FrameBufferBuildLoan class to ensure proper cleanup and automatic restart on restoration failure.
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#pragma once
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#include <EpdFontFamily.h>
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#include <cstddef>
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#include <cstdint>
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#include <map>
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class FontDecompressor;
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class SdCardFont;
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class FontCacheManager {
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public:
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FontCacheManager(const std::map<int, EpdFontFamily>& fontMap, const std::map<int, SdCardFont*>& sdCardFonts);
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void setFontDecompressor(FontDecompressor* d);
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void clearCache();
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void prewarmCache(int fontId, const char* utf8Text, uint8_t styleMask = 0x0F);
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void logStats(const char* label = "render");
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void resetStats();
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// Scan-mode API: called by GfxRenderer::drawText() during scan pass
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bool isScanning() const;
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void recordText(const char* text, int fontId, EpdFontFamily::Style style);
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// The FontDecompressor pointer, needed by GfxRenderer::getGlyphBitmap()
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FontDecompressor* getDecompressor() const { return fontDecompressor_; }
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// RAII scope for two-pass prewarm pattern
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class PrewarmScope {
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public:
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explicit PrewarmScope(FontCacheManager& manager);
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~PrewarmScope();
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void endScanAndPrewarm();
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PrewarmScope(PrewarmScope&& other) noexcept;
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PrewarmScope& operator=(PrewarmScope&&) = delete;
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PrewarmScope(const PrewarmScope&) = delete;
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PrewarmScope& operator=(const PrewarmScope&) = delete;
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private:
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FontCacheManager* manager_;
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bool active_ = true;
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};
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PrewarmScope createPrewarmScope();
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private:
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const std::map<int, EpdFontFamily>& fontMap_;
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const std::map<int, SdCardFont*>& sdCardFonts_;
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FontDecompressor* fontDecompressor_ = nullptr;
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enum class ScanMode : uint8_t { None, Scanning };
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ScanMode scanMode_ = ScanMode::None;
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static constexpr size_t SCAN_TEXT_CAPACITY = 2048;
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char scanText_[SCAN_TEXT_CAPACITY] = {};
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size_t scanTextLen_ = 0;
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uint32_t scanStyleCounts_[4] = {};
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int scanFontId_ = -1;
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};
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