source: trunk/poppler/freetype2/include/freetype/ftpfr.h @ 182

Last change on this file since 182 was 150, checked in by Eugene Romanenko, 15 years ago

update freetype to 2.2.1

File size: 6.3 KB
Line 
1/***************************************************************************/
2/*                                                                         */
3/*  ftpfr.h                                                                */
4/*                                                                         */
5/*    FreeType API for accessing PFR-specific data (specification only).   */
6/*                                                                         */
7/*  Copyright 2002, 2003, 2004, 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 __FTPFR_H__
20#define __FTPFR_H__
21
22#include <ft2build.h>
23#include FT_FREETYPE_H
24
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
30
31
32FT_BEGIN_HEADER
33
34
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  /*************************************************************************/
50
51
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  *      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 );
95
96
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 );
133
134
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 );
163
164 /* */
165
166
167FT_END_HEADER
168
169#endif /* __FTPFR_H__ */
170
171
172/* END */
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