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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.io/license.html
*/
/* A compressed font format based on run length encoding and dictionary
* compression.
*/
#ifndef _MF_RLEFONT_H_
#define _MF_RLEFONT_H_
#include "mf_font.h"
/* Versions of the RLE font format that are supported. */
#define MF_RLEFONT_VERSION_4_SUPPORTED 1
/* Structure for a range of characters. This implements a sparse storage of
* character indices, so that you can e.g. pick a 100 characters in the middle
* of the UTF16 range and just store them. */
struct mf_rlefont_char_range_s
{
/* The number of the first character in this range. */
uint16_t first_char;
/* The total count of characters in this range. */
uint16_t char_count;
/* Lookup table with the start indices into glyph_data. */
const uint16_t *glyph_offsets;
/* The encoded glyph data for glyphs in this range. */
const uint8_t *glyph_data;
};
/* Structure for a single encoded font. */
struct mf_rlefont_s
{
struct mf_font_s font;
/* Version of the font definition used. */
const uint8_t version;
/* Big array of the data for all the dictionary entries. */
const uint8_t *dictionary_data;
/* Lookup table with the start indices into dictionary_data.
* Contains N+1 entries, so that the length of the entry can
* be determined by subtracting from the next offset. */
const uint16_t *dictionary_offsets;
/* Number of dictionary entries using the RLE encoding.
* Entries starting at this index use the dictionary encoding. */
const uint8_t rle_entry_count;
/* Total number of dictionary entries.
* Entries after this are nonexistent. */
const uint8_t dict_entry_count;
/* Number of discontinuous character ranges */
const uint16_t char_range_count;
/* Array of the character ranges */
const struct mf_rlefont_char_range_s *char_ranges;
};
#ifdef MF_RLEFONT_INTERNALS
/* Internal functions, don't use these directly. */
MF_EXTERN uint8_t mf_rlefont_render_character(const struct mf_font_s *font,
int16_t x0, int16_t y0,
uint16_t character,
mf_pixel_callback_t callback,
void *state);
MF_EXTERN uint8_t mf_rlefont_character_width(const struct mf_font_s *font,
uint16_t character);
#endif
#endif
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