firmware/export/font.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (c) 2002 by Greg Haerr <greg@censoft.com>
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #ifndef _FONT_H
  20 #define _FONT_H
  21
  22 #include "inttypes.h"
  23
  24 /*
  25  * Incore font and image definitions
  26  */
  27 #include "config.h"
  28
  29 #if defined(HAVE_LCD_BITMAP) || defined(SIMULATOR)
  30 #include "sysfont.h"
  31
  32 /* max static loadable font buffer size */
  33 #ifndef MAX_FONT_SIZE
  34 #if LCD_HEIGHT > 64
  35 #if MEM > 2
  36 #define MAX_FONT_SIZE   60000
  37 #else
  38 #define MAX_FONT_SIZE   10000
  39 #endif
  40 #else
  41 #define MAX_FONT_SIZE   4000
  42 #endif
  43 #endif
  44
  45 #ifndef FONT_HEADER_SIZE
  46 #define FONT_HEADER_SIZE 36
  47 #endif
  48
  49 #define GLYPH_CACHE_FILE "/.rockbox/.glyphcache"
  50
  51 /*
  52  * Fonts are specified by number, and used for display
  53  * of menu information as well as mp3 filename data.
  54  * At system startup, up to MAXFONTS fonts are initialized,
  55  * either by being compiled-in, or loaded from disk.
  56  * If the font asked for does not exist, then the
  57  * system uses the next lower font number.  Font 0
  58  * must be available at system startup.
  59  * Fonts are specified in firmware/font.c.
  60  */
  61 enum {
  62     FONT_SYSFIXED, /* system fixed pitch font*/
  63     FONT_UI,       /* system porportional font*/
  64     MAXFONTS
  65 };
  66
  67 /*
  68  * .fnt loadable font file format definition
  69  *
  70  * format                     len  description
  71  * -------------------------  ---- ------------------------------
  72  * UCHAR version[4]              4   magic number and version bytes
  73  * USHORT maxwidth               2   font max width in pixels
  74  * USHORT height                 2   font height in pixels
  75  * USHORT ascent                 2   font ascent (baseline) in pixels
  76  * USHORT pad                    2   unused, pad to 32-bit boundary
  77  * ULONG firstchar               4   first character code in font
  78  * ULONG defaultchar             4   default character code in font
  79  * ULONG size                    4   # characters in font
  80  * ULONG nbits                   4   # bytes imagebits data in file
  81  * ULONG noffset                 4   # longs offset data in file
  82  * ULONG nwidth                  4   # bytes width data in file
  83  * MWIMAGEBITS bits          nbits   image bits variable data
  84  * [MWIMAGEBITS padded to 16-bit boundary]
  85  * USHORT offset         noffset*2   offset variable data
  86  * UCHAR width            nwidth*1   width variable data
  87  */
  88
  89 /* loadable font magic and version #*/
  90 #define VERSION "RB12"
  91
  92 /* builtin C-based proportional/fixed font structure */
  93 /* based on The Microwindows Project http://microwindows.org */
  94 struct font {
  95     int          maxwidth;        /* max width in pixels*/
  96     unsigned int height;          /* height in pixels*/
  97     int          ascent;          /* ascent (baseline) height*/
  98     int          firstchar;       /* first character in bitmap*/
  99     int          size;            /* font size in glyphs*/
 100     const unsigned char *bits;    /* 8-bit column bitmap data*/
 101     const unsigned short *offset; /* offsets into bitmap data*/
 102     const unsigned char *width;   /* character widths or NULL if fixed*/
 103     int          defaultchar;     /* default char (not glyph index)*/
 104     int32_t      bits_size;       /* # bytes of glyph bits*/
 105 };
 106
 107 /* font routines*/
 108 void font_init(void);
 109 struct font* font_load(const char *path);
 110 struct font* font_get(int font);
 111 void font_reset(void);
 112 int font_getstringsize(const unsigned char *str, int *w, int *h, int fontnumber);
 113 int font_get_width(struct font* ft, unsigned short ch);
 114 const unsigned char * font_get_bits(struct font* ft, unsigned short ch);
 115 void glyph_cache_save(void);
 116
 117 #else /* HAVE_LCD_BITMAP */
 118
 119 #define font_init()
 120 #define font_load(x)
 121
 122 #endif
 123
 124 #endif