include/freetype/ftrender.h


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

/***************************************************************************/
/*                                                                         */
/*  ftrender.h                                                             */
/*                                                                         */
/*    FreeType renderer modules public interface (specification).          */
/*                                                                         */
/*  Copyright 1996-2000 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 FTRENDER_H
#define FTRENDER_H

#include <freetype/ftmodule.h>
#include <freetype/ftglyph.h>


#ifdef __cplusplus
  extern "C" {
#endif


  /* create a new glyph object */
  typedef FT_Error  (*FT_Glyph_Init_Func)( FT_Glyph      glyph,
                                           FT_GlyphSlot  slot );

  /* destroys a given glyph object */
  typedef void  (*FT_Glyph_Done_Func)( FT_Glyph  glyph );

  typedef void  (*FT_Glyph_Transform_Func)( FT_Glyph    glyph,
                                            FT_Matrix*  matrix,
                                            FT_Vector*  delta );

  typedef void  (*FT_Glyph_BBox_Func)( FT_Glyph  glyph,
                                       FT_BBox*  abbox );

  typedef FT_Error  (*FT_Glyph_Copy_Func)( FT_Glyph   source,
                                           FT_Glyph   target );

  typedef FT_Error  (*FT_Glyph_Prepare_Func)( FT_Glyph      glyph,
                                              FT_GlyphSlot  slot );

  struct  FT_Glyph_Class_
  {
    FT_UInt                  glyph_size;
    FT_Glyph_Format          glyph_format;
    FT_Glyph_Init_Func       glyph_init;
    FT_Glyph_Done_Func       glyph_done;
    FT_Glyph_Copy_Func       glyph_copy;
    FT_Glyph_Transform_Func  glyph_transform;
    FT_Glyph_BBox_Func       glyph_bbox;
    FT_Glyph_Prepare_Func    glyph_prepare;
  };


  typedef FT_Error  (*FTRenderer_render)( FT_Renderer   renderer,
                                          FT_GlyphSlot  slot,
                                          FT_UInt       mode,
                                          FT_Vector*    origin );

  typedef FT_Error  (*FTRenderer_transform)( FT_Renderer   renderer,
                                             FT_GlyphSlot  slot,
                                             FT_Matrix*    matrix,
                                             FT_Vector*    delta );

  typedef void  (*FTRenderer_getCBox)( FT_Renderer   renderer,
                                       FT_GlyphSlot  slot,
                                       FT_BBox*      cbox );

  typedef FT_Error  (*FTRenderer_setMode)( FT_Renderer  renderer,
                                           FT_ULong     mode_tag,
                                           FT_Pointer   mode_ptr );


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_Renderer_Class                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The renderer module class descriptor.                              */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    root         :: The root FT_Module_Class fields.                   */
  /*                                                                       */
  /*    glyph_format :: The glyph image format this renderer handles.      */
  /*                                                                       */
  /*    render_glyph :: A method used to render the image that is in a     */
  /*                    given glyph slot into a bitmap.                    */
  /*                                                                       */
  /*    set_mode     :: A method used to pass additional parameters.       */
  /*                                                                       */
  /*    raster_class :: For `ft_glyph_format_outline' renderers only, this */
  /*                    is a pointer to its raster's class.                */
  /*                                                                       */
  /*    raster       :: For `ft_glyph_format_outline' renderers only. this */
  /*                    is a pointer to the corresponding raster object,   */
  /*                    if any.                                            */
  /*                                                                       */
  typedef struct  FT_Renderer_Class_
  {
    FT_Module_Class       root;

    FT_Glyph_Format       glyph_format;

    FTRenderer_render     render_glyph;
    FTRenderer_transform  transform_glyph;
    FTRenderer_getCBox    get_glyph_cbox;
    FTRenderer_setMode    set_mode;

    FT_Raster_Funcs*      raster_class;

  } FT_Renderer_Class;


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Get_Renderer                                                    */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Retrieves the current renderer for a given glyph format.           */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library :: A handle to the library object.                         */
  /*                                                                       */
  /*    format  :: The glyph format.                                       */
  /*                                                                       */
  /* <Return>                                                              */
  /*    A renderer handle.  0 if none found.                               */
  /*                                                                       */
  /* <Note>                                                                */
  /*    An error will be returned if a module already exists by that name, */
  /*    or if the module requires a version of FreeType that is too great. */
  /*                                                                       */
  /*    To add a new renderer, simply use FT_Add_Module().  To retrieve a  */
  /*    renderer by its name, use FT_Get_Module().                         */
  /*                                                                       */
  FT_EXPORT_DEF( FT_Renderer )  FT_Get_Renderer( FT_Library       library,
                                                 FT_Glyph_Format  format );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Set_Renderer                                                    */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Sets the current renderer to use, and set additional mode.         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library    :: A handle to the library object.                      */
  /*                                                                       */
  /*    renderer   :: A handle to the renderer object.                     */
  /*                                                                       */
  /*    num_params :: The number of additional parameters.                 */
  /*                                                                       */
  /*    parameters :: Additional parameters.                               */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    In case of success, the renderer will be used to convert glyph     */
  /*    images in the renderer's known format into bitmaps.                */
  /*                                                                       */
  /*    This doesn't change the current renderer for other formats.        */
  /*                                                                       */
  FT_EXPORT_DEF(FT_Error) FT_Set_Renderer( FT_Library     library,
                                           FT_Renderer    renderer,
                                           FT_UInt        num_params,
                                           FT_Parameter*  parameters );


#ifdef __cplusplus
  }
#endif


#endif /* FTRENDER_H */


/* END */