freetype/include/ftbitmap.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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232

/***************************************************************************/
/*                                                                         */
/*  ftbitmap.h                                                             */
/*                                                                         */
/*    FreeType utility functions for bitmaps (specification).              */
/*                                                                         */
/*  Copyright 2004-2006, 2008, 2013, 2014 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 __FTBITMAP_H__
#define __FTBITMAP_H__


#include <ft2build.h>
#include <freetype.h>

#ifdef FREETYPE_H
#error "freetype.h of FreeType 1 has been loaded!"
#error "Please fix the directory search order for header files"
#error "so that freetype.h of FreeType 2 is found first."
#endif


FT_BEGIN_HEADER


  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    bitmap_handling                                                    */
  /*                                                                       */
  /* <Title>                                                               */
  /*    Bitmap Handling                                                    */
  /*                                                                       */
  /* <Abstract>                                                            */
  /*    Handling FT_Bitmap objects.                                        */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This section contains functions for handling @FT_Bitmap objects.   */
  /*    Note that none of the functions changes the bitmap's `flow' (as    */
  /*    indicated by the sign of the `pitch' field in `FT_Bitmap').        */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Bitmap_New                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initialize a pointer to an @FT_Bitmap structure.                   */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    abitmap :: A pointer to the bitmap structure.                      */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Bitmap_New( FT_Bitmap  *abitmap );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Bitmap_Copy                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Copy a bitmap into another one.                                    */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library :: A handle to a library object.                           */
  /*                                                                       */
  /*    source  :: A handle to the source bitmap.                          */
  /*                                                                       */
  /* <Output>                                                              */
  /*    target  :: A handle to the target bitmap.                          */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0~means success.                             */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Bitmap_Copy( FT_Library        library,
                  const FT_Bitmap  *source,
                  FT_Bitmap        *target);


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Bitmap_Embolden                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Embolden a bitmap.  The new bitmap will be about `xStrength'       */
  /*    pixels wider and `yStrength' pixels higher.  The left and bottom   */
  /*    borders are kept unchanged.                                        */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library   :: A handle to a library object.                         */
  /*                                                                       */
  /*    xStrength :: How strong the glyph is emboldened horizontally.      */
  /*                 Expressed in 26.6 pixel format.                       */
  /*                                                                       */
  /*    yStrength :: How strong the glyph is emboldened vertically.        */
  /*                 Expressed in 26.6 pixel format.                       */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    bitmap    :: A handle to the target bitmap.                        */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0~means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The current implementation restricts `xStrength' to be less than   */
  /*    or equal to~8 if bitmap is of pixel_mode @FT_PIXEL_MODE_MONO.      */
  /*                                                                       */
  /*    If you want to embolden the bitmap owned by a @FT_GlyphSlotRec,    */
  /*    you should call @FT_GlyphSlot_Own_Bitmap on the slot first.        */
  /*                                                                       */
  /*    Bitmaps in @FT_PIXEL_MODE_GRAY2 and @FT_PIXEL_MODE_GRAY@ format    */
  /*    are converted to @FT_PIXEL_MODE_GRAY format (i.e., 8bpp).          */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Bitmap_Embolden( FT_Library  library,
                      FT_Bitmap*  bitmap,
                      FT_Pos      xStrength,
                      FT_Pos      yStrength );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Bitmap_Convert                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Convert a bitmap object with depth 1bpp, 2bpp, 4bpp, 8bpp or 32bpp */
  /*    to a bitmap object with depth 8bpp, making the number of used      */
  /*    bytes line (a.k.a. the `pitch') a multiple of `alignment'.         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library   :: A handle to a library object.                         */
  /*                                                                       */
  /*    source    :: The source bitmap.                                    */
  /*                                                                       */
  /*    alignment :: The pitch of the bitmap is a multiple of this         */
  /*                 parameter.  Common values are 1, 2, or 4.             */
  /*                                                                       */
  /* <Output>                                                              */
  /*    target    :: The target bitmap.                                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0~means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    It is possible to call @FT_Bitmap_Convert multiple times without   */
  /*    calling @FT_Bitmap_Done (the memory is simply reallocated).        */
  /*                                                                       */
  /*    Use @FT_Bitmap_Done to finally remove the bitmap object.           */
  /*                                                                       */
  /*    The `library' argument is taken to have access to FreeType's       */
  /*    memory handling functions.                                         */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Bitmap_Convert( FT_Library        library,
                     const FT_Bitmap  *source,
                     FT_Bitmap        *target,
                     FT_Int            alignment );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_GlyphSlot_Own_Bitmap                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Make sure that a glyph slot owns `slot->bitmap'.                   */
  /*                                                                       */
  /* <Input>                                                               */
  /*    slot :: The glyph slot.                                            */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0~means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    This function is to be used in combination with                    */
  /*    @FT_Bitmap_Embolden.                                               */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot  slot );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Bitmap_Done                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Destroy a bitmap object created with @FT_Bitmap_New.               */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library :: A handle to a library object.                           */
  /*                                                                       */
  /*    bitmap  :: The bitmap object to be freed.                          */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0~means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The `library' argument is taken to have access to FreeType's       */
  /*    memory handling functions.                                         */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Bitmap_Done( FT_Library  library,
                  FT_Bitmap  *bitmap );


  /* */


FT_END_HEADER

#endif /* __FTBITMAP_H__ */


/* END */