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1 /***************************************************************************/
2 /* */
3 /* ftadvanc.h */
4 /* */
5 /* Quick computation of advance widths (specification only). */
6 /* */
7 /* Copyright 2008 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 __FTADVANC_H__
20 #define __FTADVANC_H__
21
22
23 #include <ft2build.h>
24 #include FT_FREETYPE_H
25
26 #ifdef FREETYPE_H
27 #error "freetype.h of FreeType 1 has been loaded!"
28 #error "Please fix the directory search order for header files"
29 #error "so that freetype.h of FreeType 2 is found first."
30 #endif
31
32
33 FT_BEGIN_HEADER
34
35
36 /**************************************************************************
37 *
38 * @section:
39 * quick_advance
40 *
41 * @title:
42 * Quick retrieval of advance values
43 *
44 * @abstract:
45 * Retrieve horizontal and vertical advance values without processing
46 * glyph outlines, if possible.
47 *
48 * @description:
49 * This section contains functions to quickly extract advance values
50 * without handling glyph outlines, if possible.
51 */
52
53
54 /*************************************************************************/
55 /* */
56 /* <Const> */
57 /* FT_ADVANCE_FLAG_FAST_ONLY */
58 /* */
59 /* <Description> */
60 /* A bit-flag to be OR-ed with the `flags' parameter of the */
61 /* @FT_Get_Advance and @FT_Get_Advances functions. */
62 /* */
63 /* If set, it indicates that you want these functions to fail if the */
64 /* corresponding hinting mode or font driver doesn't allow for very */
65 /* quick advance computation. */
66 /* */
67 /* Typically, glyphs which are either unscaled, unhinted, bitmapped, */
68 /* or light-hinted can have their advance width computed very */
69 /* quickly. */
70 /* */
71 /* Normal and bytecode hinted modes, which require loading, scaling, */
72 /* and hinting of the glyph outline, are extremely slow by */
73 /* comparison. */
74 /* */
75 #define FT_ADVANCE_FLAG_FAST_ONLY 0x20000000UL
76
77
78 /*************************************************************************/
79 /* */
80 /* <Function> */
81 /* FT_Get_Advance */
82 /* */
83 /* <Description> */
84 /* Retrieve the advance value of a given glyph outline in an */
85 /* @FT_Face. By default, the unhinted advance is returned in font */
86 /* units. */
87 /* */
88 /* <Input> */
89 /* face :: The source @FT_Face handle. */
90 /* */
91 /* gindex :: The glyph index. */
92 /* */
93 /* load_flags :: A set of bit flags similar to those used when */
94 /* calling @FT_Load_Glyph, used to determine what kind */
95 /* of advances you need. */
96 /* <Output> */
97 /* padvance :: The advance value, in either font units or 16.16 */
98 /* format. */
99 /* */
100 /* If @FT_LOAD_VERTICAL_LAYOUT is set, this is the */
101 /* vertical advance corresponding to a vertical layout. */
102 /* Otherwise, it is the horizontal advance in a */
103 /* horizontal layout. */
104 /* */
105 /* <Return> */
106 /* FreeType error code. 0 means success. */
107 /* */
108 /* <Note> */
109 /* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */
110 /* if the corresponding font backend doesn't have a quick way to */
111 /* retrieve the advances. */
112 /* */
113 /* A scaled advance is returned in 16.16 format but isn't transformed */
114 /* by the affine transformation specified by @FT_Set_Transform. */
115 /* */
116 FT_EXPORT( FT_Error )
117 FT_Get_Advance( FT_Face face,
118 FT_UInt gindex,
119 FT_Int32 load_flags,
120 FT_Fixed *padvance );
121
122
123 /*************************************************************************/
124 /* */
125 /* <Function> */
126 /* FT_Get_Advances */
127 /* */
128 /* <Description> */
129 /* Retrieve the advance values of several glyph outlines in an */
130 /* @FT_Face. By default, the unhinted advances are returned in font */
131 /* units. */
132 /* */
133 /* <Input> */
134 /* face :: The source @FT_Face handle. */
135 /* */
136 /* start :: The first glyph index. */
137 /* */
138 /* count :: The number of advance values you want to retrieve. */
139 /* */
140 /* load_flags :: A set of bit flags similar to those used when */
141 /* calling @FT_Load_Glyph. */
142 /* */
143 /* <Output> */
144 /* padvance :: The advances, in either font units or 16.16 format. */
145 /* This array must contain at least `count' elements. */
146 /* */
147 /* If @FT_LOAD_VERTICAL_LAYOUT is set, these are the */
148 /* vertical advances corresponding to a vertical layout. */
149 /* Otherwise, they are the horizontal advances in a */
150 /* horizontal layout. */
151 /* */
152 /* <Return> */
153 /* FreeType error code. 0 means success. */
154 /* */
155 /* <Note> */
156 /* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */
157 /* if the corresponding font backend doesn't have a quick way to */
158 /* retrieve the advances. */
159 /* */
160 /* Scaled advances are returned in 16.16 format but aren't */
161 /* transformed by the affine transformation specified by */
162 /* @FT_Set_Transform. */
163 /* */
164 FT_EXPORT( FT_Error )
165 FT_Get_Advances( FT_Face face,
166 FT_UInt start,
167 FT_UInt count,
168 FT_Int32 load_flags,
169 FT_Fixed *padvances );
170
171 /* */
172
173
174 FT_END_HEADER
175
176 #endif /* __FTADVANC_H__ */
177
178
179 /* END */
Super Polarity - A Shooter with magnetism! #game