85 lines
2.6 KiB
C
85 lines
2.6 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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/* Uncompressed font format for storing black & white fonts. Very efficient
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* to decode and works well for small font sizes.
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*/
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#ifndef _MF_BWFONT_H_
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#define _MF_BWFONT_H_
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#include "mf_font.h"
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/* Versions of the BW font format that are supported. */
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#define MF_BWFONT_VERSION_4_SUPPORTED 1
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/* Structure for a range of characters. */
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struct mf_bwfont_char_range_s
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{
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/* The number of the first character in this range. */
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uint16_t first_char;
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/* The total count of characters in this range. */
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uint16_t char_count;
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/* The left and top skips of the characters in this range.
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* This is the number of empty rows at left and at top. */
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uint8_t offset_x;
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uint8_t offset_y;
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/* Column height for glyphs in this range, in bytes and pixels. */
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uint8_t height_bytes;
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uint8_t height_pixels;
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/* Positive value if the width of all glyphs in this range is the
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* same, or zero if it is not. */
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uint8_t width;
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/* Lookup table for the character widths. NULL if width is specified. */
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const uint8_t *glyph_widths;
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/* Lookup table for the character offsets. Multiply by height_bytes
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* to get the byte offset. Also allows lookup of the number of columns.
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* NULL if width is specified. */
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const uint16_t *glyph_offsets;
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/* Table for the glyph data.
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* The data for each glyph is column-by-column, with N bytes per each
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* column. The LSB of the first byte is the top left pixel.
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*/
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const uint8_t *glyph_data;
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};
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/* Structure for the font */
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struct mf_bwfont_s
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{
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struct mf_font_s font;
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/* Version of the font format. */
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const uint8_t version;
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/* Number of character ranges. */
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const uint16_t char_range_count;
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/* Array of the character ranges */
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const struct mf_bwfont_char_range_s *char_ranges;
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};
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#ifdef MF_BWFONT_INTERNALS
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/* Internal functions, don't use these directly. */
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MF_EXTERN uint8_t mf_bwfont_render_character(const struct mf_font_s *font,
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int16_t x0, int16_t y0,
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uint16_t character,
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mf_pixel_callback_t callback,
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void *state);
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MF_EXTERN uint8_t mf_bwfont_character_width(const struct mf_font_s *font,
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uint16_t character);
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#endif
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#endif
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