firmware/include/font_cache.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  *
   9  * Copyright (C) 2003 Tat Tang
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  17  * KIND, either express or implied.
  18  *
  19  ****************************************************************************/
  20 #ifndef _FONT_CACHE_H_
  21 #define _FONT_CACHE_H_
  22 #include "lru.h"
  23
  24 /*******************************************************************************
  25  *
  26  ******************************************************************************/
  27 struct font_cache
  28 {
  29     struct lru _lru;
  30     int _size;
  31     int _capacity;
  32     int _prev_char_code;
  33     int _prev_result;
  34     short *_index; /* index of lru handles in char_code order */
  35 };
  36
  37 struct font_cache_entry
  38 {
  39     unsigned short _char_code;
  40     unsigned char width;
  41     unsigned char bitmap[1]; /* place holder */
  42 };
  43
  44 /* void (*f) (void*, struct font_cache_entry*); */
  45 /* Create an auto sized font cache from buf */
  46 void font_cache_create(
  47     struct font_cache* fcache, void* buf, int buf_size, int bitmap_bytes_size);
  48 /* Get font cache entry */
  49 struct font_cache_entry* font_cache_get(
  50     struct font_cache* fcache,
  51     unsigned short char_code,
  52     void (*callback) (struct font_cache_entry* p, void *callback_data),
  53     void *callback_data);
  54
  55 #endif