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view libs/ft2static/freetype/ftpfr.h @ 1:e7ca128b8713
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| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 02 Feb 2014 00:35:22 +0200 |
| parents | |
| children |
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1 /***************************************************************************/
2 /* */
3 /* ftpfr.h */
4 /* */
5 /* FreeType API for accessing PFR-specific data (specification only). */
6 /* */
7 /* Copyright 2002, 2003, 2004, 2006, 2008, 2009 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 /***************************************************************************/
19 #ifndef __FTPFR_H__
20 #define __FTPFR_H__
22 #include <ft2build.h>
23 #include FT_FREETYPE_H
25 #ifdef FREETYPE_H
26 #error "freetype.h of FreeType 1 has been loaded!"
27 #error "Please fix the directory search order for header files"
28 #error "so that freetype.h of FreeType 2 is found first."
29 #endif
32 FT_BEGIN_HEADER
35 /*************************************************************************/
36 /* */
37 /* <Section> */
38 /* pfr_fonts */
39 /* */
40 /* <Title> */
41 /* PFR Fonts */
42 /* */
43 /* <Abstract> */
44 /* PFR/TrueDoc specific API. */
45 /* */
46 /* <Description> */
47 /* This section contains the declaration of PFR-specific functions. */
48 /* */
49 /*************************************************************************/
52 /**********************************************************************
53 *
54 * @function:
55 * FT_Get_PFR_Metrics
56 *
57 * @description:
58 * Return the outline and metrics resolutions of a given PFR face.
59 *
60 * @input:
61 * face :: Handle to the input face. It can be a non-PFR face.
62 *
63 * @output:
64 * aoutline_resolution ::
65 * Outline resolution. This is equivalent to `face->units_per_EM'
66 * for non-PFR fonts. Optional (parameter can be NULL).
67 *
68 * ametrics_resolution ::
69 * Metrics resolution. This is equivalent to `outline_resolution'
70 * for non-PFR fonts. Optional (parameter can be NULL).
71 *
72 * ametrics_x_scale ::
73 * A 16.16 fixed-point number used to scale distance expressed
74 * in metrics units to device sub-pixels. This is equivalent to
75 * `face->size->x_scale', but for metrics only. Optional (parameter
76 * can be NULL).
77 *
78 * ametrics_y_scale ::
79 * Same as `ametrics_x_scale' but for the vertical direction.
80 * optional (parameter can be NULL).
81 *
82 * @return:
83 * FreeType error code. 0~means success.
84 *
85 * @note:
86 * If the input face is not a PFR, this function will return an error.
87 * However, in all cases, it will return valid values.
88 */
89 FT_EXPORT( FT_Error )
90 FT_Get_PFR_Metrics( FT_Face face,
91 FT_UInt *aoutline_resolution,
92 FT_UInt *ametrics_resolution,
93 FT_Fixed *ametrics_x_scale,
94 FT_Fixed *ametrics_y_scale );
97 /**********************************************************************
98 *
99 * @function:
100 * FT_Get_PFR_Kerning
101 *
102 * @description:
103 * Return the kerning pair corresponding to two glyphs in a PFR face.
104 * The distance is expressed in metrics units, unlike the result of
105 * @FT_Get_Kerning.
106 *
107 * @input:
108 * face :: A handle to the input face.
109 *
110 * left :: Index of the left glyph.
111 *
112 * right :: Index of the right glyph.
113 *
114 * @output:
115 * avector :: A kerning vector.
116 *
117 * @return:
118 * FreeType error code. 0~means success.
119 *
120 * @note:
121 * This function always return distances in original PFR metrics
122 * units. This is unlike @FT_Get_Kerning with the @FT_KERNING_UNSCALED
123 * mode, which always returns distances converted to outline units.
124 *
125 * You can use the value of the `x_scale' and `y_scale' parameters
126 * returned by @FT_Get_PFR_Metrics to scale these to device sub-pixels.
127 */
128 FT_EXPORT( FT_Error )
129 FT_Get_PFR_Kerning( FT_Face face,
130 FT_UInt left,
131 FT_UInt right,
132 FT_Vector *avector );
135 /**********************************************************************
136 *
137 * @function:
138 * FT_Get_PFR_Advance
139 *
140 * @description:
141 * Return a given glyph advance, expressed in original metrics units,
142 * from a PFR font.
143 *
144 * @input:
145 * face :: A handle to the input face.
146 *
147 * gindex :: The glyph index.
148 *
149 * @output:
150 * aadvance :: The glyph advance in metrics units.
151 *
152 * @return:
153 * FreeType error code. 0~means success.
154 *
155 * @note:
156 * You can use the `x_scale' or `y_scale' results of @FT_Get_PFR_Metrics
157 * to convert the advance to device sub-pixels (i.e., 1/64th of pixels).
158 */
159 FT_EXPORT( FT_Error )
160 FT_Get_PFR_Advance( FT_Face face,
161 FT_UInt gindex,
162 FT_Pos *aadvance );
164 /* */
167 FT_END_HEADER
169 #endif /* __FTPFR_H__ */
172 /* END */