feat: Add custom font selection from SD card
Allow users to select custom fonts (.epdfont files) from the /.crosspoint/fonts/ directory on the SD card for EPUB/TXT reading. Features: - New FontSelectionActivity for browsing and selecting fonts - SdFont and SdFontFamily classes for loading fonts from SD card - Dynamic font reloading without device reboot - Reader cache invalidation when font changes - Hash-based font ID generation for proper cache management The custom fonts use the .epdfont binary format which supports: - 2-bit antialiasing for smooth text rendering - Efficient on-demand glyph loading with LRU cache - Memory-optimized design for ESP32-C3 constraints
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@@ -14,6 +14,9 @@ class EpdFontFamily {
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const EpdFontData* getData(Style style = REGULAR) const;
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const EpdGlyph* getGlyph(uint32_t cp, Style style = REGULAR) const;
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// Check if bold variant is available (for synthetic bold decision)
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bool hasBold() const { return bold != nullptr; }
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private:
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const EpdFont* regular;
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const EpdFont* bold;
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@@ -22,3 +25,10 @@ class EpdFontFamily {
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const EpdFont* getFont(Style style) const;
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};
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// Global typedef for use outside class scope (needed by SdFontFamily and GfxRenderer)
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using EpdFontStyle = EpdFontFamily::Style;
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constexpr EpdFontStyle REGULAR = EpdFontFamily::REGULAR;
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constexpr EpdFontStyle BOLD = EpdFontFamily::BOLD;
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constexpr EpdFontStyle ITALIC = EpdFontFamily::ITALIC;
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constexpr EpdFontStyle BOLD_ITALIC = EpdFontFamily::BOLD_ITALIC;
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