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font format documentation updated, obsolete definitions removed

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5020 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jörg Hohensohn 2004-08-27 20:03:02 +00:00
parent 861306d330
commit a8dbabef83
1 changed files with 18 additions and 31 deletions
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49
firmware/export/font.h
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@ -50,40 +50,27 @@ enum {
/*
* .fnt loadable font file format definition
*
* format len description
* ------------------------- ---- ------------------------------
* UCHAR version[4] 4 magic number and version bytes
* UCHAR name[64] 64 font name, space padded
* UCHAR copyright[256] 256 copyright info, space padded
* USHORT maxwidth 2 font max width in pixels
* USHORT height 2 font height in pixels
* USHORT ascent 2 font ascent (baseline) in pixels
* USHORT pad 2 unused, pad to 32-bit boundary
* ULONG firstchar 4 first character code in font
* ULONG defaultchar 4 default character code in font
* ULONG size 4 # characters in font
* ULONG nbits 4 # words imagebits data in file
* ULONG noffset 4 # longs offset data in file
* ULONG nwidth 4 # bytes width data in file
* MWIMAGEBITS bits nbits*2 image bits variable data
* [MWIMAGEBITS padded to 32-bit boundary]
* ULONG offset noffset*4 offset variable data
* UCHAR width nwidth*1 width variable data
* format len description
* ------------------------- ---- ------------------------------
* UCHAR version[4] 4 magic number and version bytes
* USHORT maxwidth 2 font max width in pixels
* USHORT height 2 font height in pixels
* USHORT ascent 2 font ascent (baseline) in pixels
* USHORT pad 2 unused, pad to 32-bit boundary
* ULONG firstchar 4 first character code in font
* ULONG defaultchar 4 default character code in font
* ULONG size 4 # characters in font
* ULONG nbits 4 # bytes imagebits data in file
* ULONG noffset 4 # longs offset data in file
* ULONG nwidth 4 # bytes width data in file
* MWIMAGEBITS bits nbits image bits variable data
* [MWIMAGEBITS padded to 16-bit boundary]
* USHORT offset noffset*2 offset variable data
* UCHAR width nwidth*1 width variable data
*/
/* loadable font magic and version #*/
#define VERSION "RB12"
typedef unsigned short bitmap_t; /* bitmap image unit size*/
/* bitmap_t helper macros*/
#define BITMAP_WORDS(x) (((x)+15)/16) /* image size in words*/
#define BITMAP_BYTES(x) (BITMAP_WORDS(x)*sizeof(bitmap_t))
#define BITMAP_BITSPERIMAGE (sizeof(bitmap_t) * 8)
#define BITMAP_BITVALUE(n) ((bitmap_t) (((bitmap_t) 1) << (n)))
#define BITMAP_FIRSTBIT (BITMAP_BITVALUE(BITMAP_BITSPERIMAGE - 1))
#define BITMAP_TESTBIT(m) ((m) & BITMAP_FIRSTBIT)
#define BITMAP_SHIFTBIT(m) ((bitmap_t) ((m) << 1))
#define VERSION "RB12"
/* builtin C-based proportional/fixed font structure */
/* based on The Microwindows Project http://microwindows.org */