apps/gui/skin_engine/skin_fonts.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 Jonathan Gordon
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26
  27 #include "file.h"
  28 #include "settings.h"
  29 #include "font.h"
  30 #include "skin_buffer.h"
  31 #include "skin_fonts.h"
  32
  33 static struct skin_font_info {
  34     struct font font;
  35     int font_id;
  36     char name[MAX_PATH];
  37     char *buffer;
  38     int ref_count; /* how many times has this font been loaded? */
  39 } font_table[MAXUSERFONTS];
  40
  41 /* need this to know if we should be closing font fd's on the next init */
  42 static bool first_load = true;
  43
  44 void skin_font_init(void)
  45 {
  46     int i;
  47     for(i=0;i<MAXUSERFONTS;i++)
  48     {
  49         if (!first_load)
  50             font_unload(font_table[i].font_id);
  51         font_table[i].font_id = -1;
  52         font_table[i].name[0] = '\0';
  53         font_table[i].buffer = NULL;
  54         font_table[i].ref_count = 0;
  55     }
  56     first_load = false;
  57 }
  58
  59 /* load a font into the skin buffer. return the font id. */
  60 int skin_font_load(char* font_name, int glyphs)
  61 {
  62     int i;
  63     int skin_font_size = 0;
  64     struct font *pf;
  65     struct skin_font_info *font = NULL;
  66     char filename[MAX_PATH];
  67     char tmp[MAX_PATH];
  68
  69     if (!strcmp(font_name, global_settings.font_file))
  70         return FONT_UI;
  71 #ifdef HAVE_REMOTE_LCD
  72     if (!strcmp(font_name, global_settings.remote_font_file))
  73         return FONT_UI_REMOTE;
  74 #endif
  75     snprintf(tmp, MAX_PATH, FONT_DIR "/%s.fnt", font_name);
  76     get_user_file_path(tmp, FORCE_BUFFER_COPY, filename, sizeof(filename));
  77
  78     for(i=0;i<MAXUSERFONTS;i++)
  79     {
  80         if (font_table[i].font_id >= 0 && !strcmp(font_table[i].name, filename))
  81         {
  82             font_table[i].ref_count++;
  83             return font_table[i].font_id;
  84         }
  85         else if (!font && font_table[i].font_id == -1)
  86         {
  87             font = &font_table[i];
  88         }
  89     }
  90     if (!font)
  91         return -1; /* too many fonts loaded */
  92
  93     pf = &font->font;
  94     if (!font->buffer)
  95     {
  96         if (!glyphs)
  97             glyphs = GLYPHS_TO_CACHE;
  98 #ifndef __PCTOOL__
  99         skin_font_size = glyphs * get_glyph_size(filename);
 100 #endif
 101         if ( !skin_font_size )
 102         {
 103             skin_font_size = SKIN_FONT_SIZE;
 104         }
 105         pf->buffer_start = (char*)skin_buffer_alloc(skin_font_size);
 106         if (!pf->buffer_start)
 107             return -1;
 108         font->buffer = pf->buffer_start;
 109         pf->buffer_size = skin_font_size;
 110     }
 111     else
 112     {
 113         pf->buffer_start = font->buffer;
 114     }
 115
 116     pf->fd = -1;
 117     font->font_id = font_load(pf, filename);
 118
 119     if (font->font_id < 0)
 120         return -1;
 121     font->ref_count = 1;
 122
 123     return font->font_id;
 124 }
 125 /* unload a skin font. If a font has been loaded more than once it wont actually
 126  * be unloaded untill all references have been unloaded */
 127 void skin_font_unload(int font_id)
 128 {
 129     int i;
 130     for(i=0;i<MAXUSERFONTS;i++)
 131     {
 132         if (font_table[i].font_id == font_id)
 133         {
 134             if (--font_table[i].ref_count == 0)
 135             {
 136                 font_unload(font_id);
 137                 font_table[i].font_id = -1;
 138                 font_table[i].name[0] = '\0';
 139             }
 140             return;
 141         }
 142     }
 143 }