158 lines
4.2 KiB
C
158 lines
4.2 KiB
C
/*
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* libfbf.c - FBF font decoder
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*
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef LIBFBF_H
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#define LIBFBF_H
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typedef struct {
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unsigned int magic;
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unsigned int version;
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unsigned int nb_glyphs;
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unsigned int compressed_segment_size;
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unsigned int flags;
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unsigned short max_width;
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unsigned short max_height;
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unsigned short x_res;
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unsigned short y_res;
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unsigned short pt_size;
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unsigned short ascent;
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unsigned short descent;
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unsigned short line_height;
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short underline_position;
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unsigned short underline_thickness;
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unsigned short nb_segments;
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unsigned char family_type;
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unsigned char dummy; /* align */
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} UnifontHeader;
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#define UNIFONT_MAGIC (('U' << 24) | ('N' << 16) | ('F' << 8) | ('T'))
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/* interval compression model parameters */
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#define NB_CTX ((1 << 12) * 3 * 3)
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#define NB_CTX1 (1 << 10)
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#define MAXDIST 4
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#define MAXWIDTH 128
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#define MAXHEIGHT 128
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#define MAXWRAP ((MAXWIDTH+7)/8)
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#define WRAP (MAXWIDTH + 2 * MAXDIST)
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/* arith coder parameters */
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#define RANGE_MIN (1 << 10)
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/* flags */
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#define UF_FLAG_HANGUL 0x0001 /* use ad hoc hangul compression */
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/* family type */
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#define UF_FAMILY_FIXED 0
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#define UF_FAMILY_SERIF 1
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#define UF_FAMILY_SANS 2
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#define JOHAB_BASE 0x20000
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/* segment cache */
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typedef struct {
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short w, h;
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short x, y, xincr;
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unsigned char *bitmap;
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} GlyphEntry;
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struct UniFontData;
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typedef struct UniFontData UniFontData;
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#define CSEG_CACHE_SIZE 8
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typedef struct SegData {
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unsigned int start;
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unsigned short glyph;
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unsigned short size;
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} SegData;
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struct UniFontData {
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struct UniFontData *next_font; /* can be used by the user to link
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to next font */
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int nb_glyphs; /* real number of glyphs */
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int nb_glyphs_total; /* total number, including algorithmically
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generated ones */
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unsigned int flags;
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int compressed_segment_size;
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int max_width, max_height; /* maximum dimensions of bitmaps */
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int x_res, y_res, pt_size;
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int ascent, descent, line_height;
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int underline_position; /* in 64th pixel */
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int underline_thickness; /* in 64th pixel */
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char family_name[64];
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int family_type;
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/* compressed segments offsets */
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int nb_csegs;
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int *csegs_offsets;
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int *msegs_offsets;
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/* compressed segment cache */
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struct GlyphSegment *cseg_cache[CSEG_CACHE_SIZE];
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/* segments */
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/* XXX: allocation */
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int nb_segs;
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SegData *seg_table;
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/* memory functions */
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void *mem_opaque;
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void *(*fbf_malloc)(void *mem_opaque, int size);
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void (*fbf_free)(void *mem_opaque, void *ptr);
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/* file input handlings */
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void *infile;
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int (*fbf_seek)(void *infile, long pos);
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int (*fbf_read)(void *infile, unsigned char *buf, int len);
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int (*fbf_getc)(void *infile);
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/* bit buffer handling */
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int bitbuf;
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int bitcnt;
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unsigned char ctx1[NB_CTX1];
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/* arithmetic decoder */
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unsigned int alow, arange, adata;
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/* temporary bitmap for composite glyph decoding */
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unsigned char tmp_buffer[MAXWRAP * MAXHEIGHT];
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GlyphEntry tmp_glyph_entry;
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};
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typedef struct GlyphSegment {
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int first_glyph;
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int nb_glyphs;
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int use_count;
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unsigned char *bitmap_table;
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GlyphEntry metrics[1];
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} GlyphSegment;
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int fbf_load_font(UniFontData *uf);
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void fbf_free_font(UniFontData *uf);
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int fbf_unicode_to_glyph(UniFontData *uf, int code);
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int fbf_decode_glyph(UniFontData *uf,
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GlyphEntry **glyph_entry_ptr,
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int index);
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#endif
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