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1 /***************************************************************************/
2 /*                                                                         */
3 /*  ftgloadr.h                                                             */
4 /*                                                                         */
5 /*    The FreeType glyph loader (specification).                           */
6 /*                                                                         */
7 /*  Copyright 2002, 2003, 2005, 2006 by                                    */
8 /*  David Turner, Robert Wilhelm, and Werner Lemberg                       */
9 /*                                                                         */
10 /*  This file is part of the FreeType project, and may only be used,       */
11 /*  modified, and distributed under the terms of the FreeType project      */
12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
13 /*  this file you indicate that you have read the license and              */
14 /*  understand and accept it fully.                                        */
15 /*                                                                         */
16 /***************************************************************************/
17
18
19 #ifndef __FTGLOADR_H__
20 #define __FTGLOADR_H__
21
22
23 #include <ft2build.h>
24 #include FT_FREETYPE_H
25
26
27 FT_BEGIN_HEADER
28
29
30   /*************************************************************************/
31   /*                                                                       */
32   /* <Struct>                                                              */
33   /*    FT_GlyphLoader                                                     */
34   /*                                                                       */
35   /* <Description>                                                         */
36   /*    The glyph loader is an internal object used to load several glyphs */
37   /*    together (for example, in the case of composites).                 */
38   /*                                                                       */
39   /* <Note>                                                                */
40   /*    The glyph loader implementation is not part of the high-level API, */
41   /*    hence the forward structure declaration.                           */
42   /*                                                                       */
43   typedef struct FT_GlyphLoaderRec_*  FT_GlyphLoader ;
44
45
46 #if 0  /* moved to freetype.h in version 2.2 */
47 #define FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS          1
48 #define FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES      2
49 #define FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID        4
50 #define FT_SUBGLYPH_FLAG_SCALE                   8
51 #define FT_SUBGLYPH_FLAG_XY_SCALE             0x40
52 #define FT_SUBGLYPH_FLAG_2X2                  0x80
53 #define FT_SUBGLYPH_FLAG_USE_MY_METRICS      0x200
54 #endif
55
56
57   typedef struct  FT_SubGlyphRec_
58   {
59     FT_Int     index;
60     FT_UShort  flags;
61     FT_Int     arg1;
62     FT_Int     arg2;
63     FT_Matrix  transform;
64
65   } FT_SubGlyphRec;
66
67
68   typedef struct  FT_GlyphLoadRec_
69   {
70     FT_Outline   outline;       /* outline                   */
71     FT_Vector*   extra_points;  /* extra points table        */
72     FT_Vector*   extra_points2; /* second extra points table */
73     FT_UInt      num_subglyphs; /* number of subglyphs       */
74     FT_SubGlyph  subglyphs;     /* subglyphs                 */
75
76   } FT_GlyphLoadRec, *FT_GlyphLoad;
77
78
79   typedef struct  FT_GlyphLoaderRec_
80   {
81     FT_Memory        memory;
82     FT_UInt          max_points;
83     FT_UInt          max_contours;
84     FT_UInt          max_subglyphs;
85     FT_Bool          use_extra;
86
87     FT_GlyphLoadRec  base;
88     FT_GlyphLoadRec  current;
89
90     void*            other;            /* for possible future extension? */
91
92   } FT_GlyphLoaderRec;
93
94
95   /* create new empty glyph loader */
96   FT_BASE( FT_Error )
97   FT_GlyphLoader_New( FT_Memory        memory,
98                       FT_GlyphLoader  *aloader );
99
100   /* add an extra points table to a glyph loader */
101   FT_BASE( FT_Error )
102   FT_GlyphLoader_CreateExtra( FT_GlyphLoader  loader );
103
104   /* destroy a glyph loader */
105   FT_BASE( void )
106   FT_GlyphLoader_Done( FT_GlyphLoader  loader );
107
108   /* reset a glyph loader (frees everything int it) */
109   FT_BASE( void )
110   FT_GlyphLoader_Reset( FT_GlyphLoader  loader );
111
112   /* rewind a glyph loader */
113   FT_BASE( void )
114   FT_GlyphLoader_Rewind( FT_GlyphLoader  loader );
115
116   /* check that there is enough space to add `n_points' and `n_contours' */
117   /* to the glyph loader                                                 */
118   FT_BASE( FT_Error )
119   FT_GlyphLoader_CheckPoints( FT_GlyphLoader  loader,
120                               FT_UInt         n_points,
121                               FT_UInt         n_contours );
122
123
124 #define FT_GLYPHLOADER_CHECK_P( _loader, _count )                         \
125    ( (_count) == 0 || ((_loader)->base.outline.n_points    +              \
126                        (_loader)->current.outline.n_points +              \
127                        (unsigned long)(_count)) <= (_loader)->max_points )
128
129 #define FT_GLYPHLOADER_CHECK_C( _loader, _count )                          \
130   ( (_count) == 0 || ((_loader)->base.outline.n_contours    +              \
131                       (_loader)->current.outline.n_contours +              \
132                       (unsigned long)(_count)) <= (_loader)->max_contours )
133
134 #define FT_GLYPHLOADER_CHECK_POINTS( _loader, _points,_contours )      \
135   ( ( FT_GLYPHLOADER_CHECK_P( _loader, _points )   &&                  \
136       FT_GLYPHLOADER_CHECK_C( _loader, _contours ) )                   \
137     ? 0                                                                \
138     : FT_GlyphLoader_CheckPoints( (_loader), (_points), (_contours) ) )
139
140
141   /* check that there is enough space to add `n_subs' sub-glyphs to */
142   /* a glyph loader                                                 */
143   FT_BASE( FT_Error )
144   FT_GlyphLoader_CheckSubGlyphs( FT_GlyphLoader  loader,
145                                  FT_UInt         n_subs );
146
147   /* prepare a glyph loader, i.e. empty the current glyph */
148   FT_BASE( void )
149   FT_GlyphLoader_Prepare( FT_GlyphLoader  loader );
150
151   /* add the current glyph to the base glyph */
152   FT_BASE( void )
153   FT_GlyphLoader_Add( FT_GlyphLoader  loader );
154
155   /* copy points from one glyph loader to another */
156   FT_BASE( FT_Error )
157   FT_GlyphLoader_CopyPoints( FT_GlyphLoader  target,
158                              FT_GlyphLoader  source );
159
160  /* */
161
162
163 FT_END_HEADER
164
165 #endif /* __FTGLOADR_H__ */
166
167
168 /* END */