68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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/**
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* @file include/gdisp/fonts.h
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* @brief GDISP internal font definitions.
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* @details This is not generally needed by an application. It is used
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* by the low level drivers that need to understand a font.
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*
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* @addtogroup GDISP
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* @{
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*/
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#ifndef _GDISP_FONTS_H
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#define _GDISP_FONTS_H
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/* Don't test against GFX_USE_GDISP as we may want to use this in other non-GDISP utilities. */
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/**
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* @brief The type of a font column.
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* @note Set by defining @p GDISP_MAX_FNT_HEIGHT appropriately.
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*/
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#if GDISP_MAX_FONT_HEIGHT == 16
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typedef uint16_t fontcolumn_t;
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#elif GDISP_MAX_FONT_HEIGHT == 32
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typedef uint32_t fontcolumn_t;
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#else
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#error "GDISP: GDISP_MAX_FONT_HEIGHT must be either 16 or 32"
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#endif
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/**
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* @brief Internal font structure.
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* @note This structure is followed by:
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* 1. An array of character widths (uint8_t)
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* 2. An array of column data offsets (relative to the font structure)
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* 3. Each characters array of column data (fontcolumn_t)
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* Each sub-structure must be padded to a multiple of 8 bytes
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* to allow the tables to work across many different compilers.
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*/
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struct font {
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const char * name;
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uint8_t height;
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uint8_t charPadding;
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uint8_t lineSpacing;
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uint8_t descenderHeight;
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uint8_t minWidth;
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uint8_t maxWidth;
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char minChar;
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char maxChar;
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uint8_t xscale;
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uint8_t yscale;
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const uint8_t *widthTable;
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const uint16_t *offsetTable;
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const fontcolumn_t *dataTable;
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};
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#define _getCharWidth(f,c) (((c) < (f)->minChar || (c) > (f)->maxChar) ? 0 : (f)->widthTable[(c) - (f)->minChar])
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#define _getCharOffset(f,c) ((f)->offsetTable[(c) - (f)->minChar])
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#define _getCharData(f,c) (&(f)->dataTable[_getCharOffset(f, c)])
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#endif /* _GDISP_FONTS_H */
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/** @} */
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