summaryrefslogtreecommitdiffstats
path: root/src/cff/cffgload.h
blob: bf21654112dc9bcc6ddab2309762ed4a49c4b2db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
/***************************************************************************/
/*                                                                         */
/*  cffgload.h                                                             */
/*                                                                         */
/*    OpenType Glyph Loader (specification).                               */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003, 2004, 2006, 2007, 2008 by             */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#ifndef __CFFGLOAD_H__
#define __CFFGLOAD_H__


#include <ft2build.h>
#include FT_FREETYPE_H
#include "cffobjs.h"


FT_BEGIN_HEADER


#define CFF_MAX_OPERANDS     48
#define CFF_MAX_SUBRS_CALLS  32


  /*************************************************************************/
  /*                                                                       */
  /* <Structure>                                                           */
  /*    CFF_Builder                                                        */
  /*                                                                       */
  /* <Description>                                                         */
  /*     A structure used during glyph loading to store its outline.       */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    memory        :: The current memory object.                        */
  /*                                                                       */
  /*    face          :: The current face object.                          */
  /*                                                                       */
  /*    glyph         :: The current glyph slot.                           */
  /*                                                                       */
  /*    loader        :: The current glyph loader.                         */
  /*                                                                       */
  /*    base          :: The base glyph outline.                           */
  /*                                                                       */
  /*    current       :: The current glyph outline.                        */
  /*                                                                       */
  /*    last          :: The last point position.                          */
  /*                                                                       */
  /*    pos_x         :: The horizontal translation (if composite glyph).  */
  /*                                                                       */
  /*    pos_y         :: The vertical translation (if composite glyph).    */
  /*                                                                       */
  /*    left_bearing  :: The left side bearing point.                      */
  /*                                                                       */
  /*    advance       :: The horizontal advance vector.                    */
  /*                                                                       */
  /*    bbox          :: Unused.                                           */
  /*                                                                       */
  /*    path_begun    :: A flag which indicates that a new path has begun. */
  /*                                                                       */
  /*    load_points   :: If this flag is not set, no points are loaded.    */
  /*                                                                       */
  /*    no_recurse    :: Set but not used.                                 */
  /*                                                                       */
  /*    metrics_only  :: A boolean indicating that we only want to compute */
  /*                     the metrics of a given glyph, not load all of its */
  /*                     points.                                           */
  /*                                                                       */
  /*    hints_funcs   :: Auxiliary pointer for hinting.                    */
  /*                                                                       */
  /*    hints_globals :: Auxiliary pointer for hinting.                    */
  /*                                                                       */
  typedef struct  CFF_Builder_
  {
    FT_Memory       memory;
    TT_Face         face;
    CFF_GlyphSlot   glyph;
    FT_GlyphLoader  loader;
    FT_Outline*     base;
    FT_Outline*     current;

    FT_Vector       last;

    FT_Pos          pos_x;
    FT_Pos          pos_y;

    FT_Vector       left_bearing;
    FT_Vector       advance;

    FT_BBox         bbox;          /* bounding box */
    FT_Bool         path_begun;
    FT_Bool         load_points;
    FT_Bool         no_recurse;

    FT_Bool         metrics_only;

    void*           hints_funcs;    /* hinter-specific */
    void*           hints_globals;  /* hinter-specific */

  } CFF_Builder;


  /* execution context charstring zone */

  typedef struct  CFF_Decoder_Zone_
  {
    FT_Byte*  base;
    FT_Byte*  limit;
    FT_Byte*  cursor;

  } CFF_Decoder_Zone;


  typedef struct  CFF_Decoder_
  {
    CFF_Builder        builder;
    CFF_Font           cff;

    FT_Fixed           stack[CFF_MAX_OPERANDS + 1];
    FT_Fixed*          top;

    CFF_Decoder_Zone   zones[CFF_MAX_SUBRS_CALLS + 1];
    CFF_Decoder_Zone*  zone;

    FT_Int             flex_state;
    FT_Int             num_flex_vectors;
    FT_Vector          flex_vectors[7];

    FT_Pos             glyph_width;
    FT_Pos             nominal_width;

    FT_Bool            read_width;
    FT_Bool            width_only;
    FT_Int             num_hints;
    FT_Fixed*          buildchar;
    FT_Int             len_buildchar;

    FT_UInt            num_locals;
    FT_UInt            num_globals;

    FT_Int             locals_bias;
    FT_Int             globals_bias;

    FT_Byte**          locals;
    FT_Byte**          globals;

    FT_Byte**          glyph_names;   /* for pure CFF fonts only  */
    FT_UInt            num_glyphs;    /* number of glyphs in font */

    FT_Render_Mode     hint_mode;

  } CFF_Decoder;


  FT_LOCAL( void )
  cff_decoder_init( CFF_Decoder*    decoder,
                    TT_Face         face,
                    CFF_Size        size,
                    CFF_GlyphSlot   slot,
                    FT_Bool         hinting,
                    FT_Render_Mode  hint_mode );

  FT_LOCAL( void )
  cff_decoder_set_width_only( CFF_Decoder*  decoder );

  FT_LOCAL( FT_Error )
  cff_decoder_prepare( CFF_Decoder*  decoder,
                       CFF_Size      size,
                       FT_UInt       glyph_index );

#if 0  /* unused until we support pure CFF fonts */

  /* Compute the maximum advance width of a font through quick parsing */
  FT_LOCAL( FT_Error )
  cff_compute_max_advance( TT_Face  face,
                           FT_Int*  max_advance );

#endif /* 0 */

  FT_LOCAL( FT_Error )
  cff_decoder_parse_charstrings( CFF_Decoder*  decoder,
                                 FT_Byte*      charstring_base,
                                 FT_ULong      charstring_len );

  FT_LOCAL( FT_Error )
  cff_slot_load( CFF_GlyphSlot  glyph,
                 CFF_Size       size,
                 FT_UInt        glyph_index,
                 FT_Int32       load_flags );


FT_END_HEADER

#endif /* __CFFGLOAD_H__ */


/* END */