forked from Bodmer/TFT_eSPI
Bodmer
9f17920115
Added SD card storage for smooth fonts with ESP32 ESP32 will use PSRAM (if available and enabled) to hold smooth font metrics Improve performance of ESP32 Sprite shared functions Add basic ST7789 driver option Latent bug fixes for pin mask
50 lines
1.8 KiB
C++
50 lines
1.8 KiB
C++
// Coded by Bodmer 10/2/18, see license in root directory.
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// This is part of the TFT_eSPI class and is associated with anti-aliased font functions
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public:
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// These are for the new antialiased fonts
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void loadFont(String fontName, fs::FS &ffs);
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void loadFont(String fontName, bool flash = true);
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void unloadFont( void );
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bool getUnicodeIndex(uint16_t unicode, uint16_t *index);
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uint16_t alphaBlend(uint8_t alpha, uint16_t fgc, uint16_t bgc);
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virtual void drawGlyph(uint16_t code);
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void showFont(uint32_t td);
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// This is for the whole font
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typedef struct
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{
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uint16_t gCount; // Total number of characters
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uint16_t yAdvance; // Line advance
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uint16_t spaceWidth; // Width of a space character
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int16_t ascent; // Height of top of 'd' above baseline, other characters may be taller
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int16_t descent; // Offset to bottom of 'p', other characters may have a larger descent
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uint16_t maxAscent; // Maximum ascent found in font
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uint16_t maxDescent; // Maximum descent found in font
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} fontMetrics;
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fontMetrics gFont = { 0, 0, 0, 0, 0, 0, 0 };
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// These are for the metrics for each individual glyph (so we don't need to seek this in file and waste time)
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uint16_t* gUnicode = NULL; //UTF-16 code, the codes are searched so do not need to be sequential
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uint8_t* gHeight = NULL; //cheight
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uint8_t* gWidth = NULL; //cwidth
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uint8_t* gxAdvance = NULL; //setWidth
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int16_t* gdY = NULL; //topExtent
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int8_t* gdX = NULL; //leftExtent
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uint32_t* gBitmap = NULL; //file pointer to greyscale bitmap
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bool fontLoaded = false; // Flags when a anti-aliased font is loaded
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fs::File fontFile;
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private:
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void loadMetrics(uint16_t gCount);
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uint32_t readInt32(void);
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fs::FS &fontFS = SPIFFS;
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bool spiffs = true; |