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/*
ChibiOS/GFX - Copyright (C) 2012
Joel Bodenmann aka Tectu <joel@unormal.org>
This file is part of ChibiOS/GFX.
ChibiOS/GFX is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/GFX is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file gdisp_fonts.h
* @brief GDISP internal font definitions.
* @details This is not generally needed by an application. It is used
* by the low level drivers that need to understand a font.
*
* @addtogroup GDISP
* @{
*/
#ifndef _GDISP_FONTS_H
#define _GDISP_FONTS_H
/* Don't test against HAL_USE_GDISP as we may want to use this in other non-GDISP utilities. */
/**
* @brief The maximum height of a font.
* @details Either 16 or 32. Defaults to 16
* @note Setting this to 32 causes the font tables to take
* twice the internal program memory.
*/
#ifndef GDISP_MAX_FONT_HEIGHT
#define GDISP_MAX_FONT_HEIGHT 16
#endif
/**
* @brief The type of a font column.
* @note Set by defining @p GDISP_MAX_FNT_HEIGHT appropriately.
*/
#if GDISP_MAX_FONT_HEIGHT == 16
typedef uint16_t fontcolumn_t;
#elif GDISP_MAX_FONT_HEIGHT == 32
typedef uint32_t fontcolumn_t;
#else
#error "GDISP: GDISP_MAX_FONT_HEIGHT must be either 16 or 32"
#endif
/**
* @brief Internal font structure.
* @note This structure is followed by:
* 1. An array of character widths (uint8_t)
* 2. An array of column data offsets (relative to the font structure)
* 3. Each characters array of column data (fontcolumn_t)
* Each sub-structure must be padded to a multiple of 8 bytes
* to allow the tables to work across many different compilers.
*/
struct font {
uint8_t height;
uint8_t charPadding;
uint8_t lineSpacing;
uint8_t descenderHeight;
uint8_t minWidth;
uint8_t maxWidth;
char minChar;
char maxChar;
uint8_t xscale;
uint8_t yscale;
const uint8_t *widthTable;
const uint16_t *offsetTable;
const fontcolumn_t *dataTable;
};
/**
* @brief Macros to get to the complex parts of the font structure.
*/
#define _getCharWidth(f,c) (((c) < (f)->minChar || (c) > (f)->maxChar) ? 0 : (f)->widthTable[(c) - (f)->minChar])
#define _getCharOffset(f,c) ((f)->offsetTable[(c) - (f)->minChar])
#define _getCharData(f,c) (&(f)->dataTable[_getCharOffset(f, c)])
#endif /* _GDISP_FONTS_H */
/** @} */
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