mirror of
https://github.com/Bodmer/TFT_eSPI.git
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55 lines
1.9 KiB
C++
55 lines
1.9 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);
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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 decodeUTF8(uint8_t *buf, uint16_t *index, uint16_t remaining);
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uint16_t decodeUTF8(uint8_t c);
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uint16_t alphaBlend(uint8_t alpha, uint16_t fgc, uint16_t bgc);
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void drawGlyph(uint16_t code);
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void showFont(uint32_t td);
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fs::File fontFile;
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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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int8_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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String _gFontFilename;
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uint8_t decoderState = 0; // UTF8 decoder state
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uint16_t decoderBuffer; // Unicode code-point buffer
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bool fontLoaded = false; // Flags when a anti-aliased font is loaded
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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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