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[reactos.git] / subsys / win32k / freetype / src / autohint / ahoptim.h
1 /***************************************************************************/
2 /*                                                                         */
3 /*  ahoptim.h                                                              */
4 /*                                                                         */
5 /*    FreeType auto hinting outline optimization (declaration).            */
6 /*                                                                         */
7 /*  Copyright 2000 Catharon Productions Inc.                               */
8 /*  Author: David Turner                                                   */
9 /*                                                                         */
10 /*  This file is part of the Catharon Typography Project and shall only    */
11 /*  be used, modified, and distributed under the terms of the Catharon     */
12 /*  Open Source License that should come with this file under the name     */
13 /*  `CatharonLicense.txt'.  By continuing to use, modify, or distribute    */
14 /*  this file you indicate that you have read the license and              */
15 /*  understand and accept it fully.                                        */
16 /*                                                                         */
17 /*  Note that this license is compatible with the FreeType license.        */
18 /*                                                                         */
19 /***************************************************************************/
20
21
22 #ifndef AHOPTIM_H
23 #define AHOPTIM_H
24
25
26 #ifdef FT_FLAT_COMPILE
27
28 #include "ahtypes.h"
29
30 #else
31
32 #include <freetype/src/autohint/ahtypes.h>
33
34 #endif
35
36
37   /* the maximal number of stem configurations to record */
38   /* during optimization                                 */
39 #define AH_MAX_CONFIGS  8
40
41
42   typedef struct  AH_Stem_
43   {
44     FT_Pos    pos;       /* current position        */
45     FT_Pos    velocity;  /* current velocity        */
46     FT_Pos    force;     /* sum of current forces   */
47     FT_Pos    width;     /* normalized width        */
48
49     FT_Pos    min_pos;   /* minimum grid position */
50     FT_Pos    max_pos;   /* maximum grid position */
51
52     AH_Edge*  edge1;     /* left/bottom edge */
53     AH_Edge*  edge2;     /* right/top edge   */
54
55     FT_Pos    opos;      /* original position */
56     FT_Pos    owidth;    /* original width    */
57
58     FT_Pos    min_coord; /* minimum coordinate */
59     FT_Pos    max_coord; /* maximum coordinate */
60
61   } AH_Stem;
62
63
64   /* A spring between two stems */
65   typedef struct  AH_Spring_
66   {
67     AH_Stem*  stem1;
68     AH_Stem*  stem2;
69     FT_Pos    owidth;   /* original width  */
70     FT_Pos    tension;  /* current tension */
71
72   } AH_Spring;
73
74
75   /* A configuration records the position of each stem at a given time  */
76   /* as well as the associated distortion                               */
77   typedef struct AH_Configuration_
78   {
79     FT_Pos*  positions;
80     FT_Long  distortion;
81
82   } AH_Configuration;
83
84
85   typedef struct  AH_Optimizer_
86   {
87     FT_Memory         memory;
88     AH_Outline*       outline;
89
90     FT_Int            num_hstems;
91     AH_Stem*          horz_stems;
92
93     FT_Int            num_vstems;
94     AH_Stem*          vert_stems;
95
96     FT_Int            num_hsprings;
97     FT_Int            num_vsprings;
98     AH_Spring*        horz_springs;
99     AH_Spring*        vert_springs;
100
101     FT_Int            num_configs;
102     AH_Configuration  configs[AH_MAX_CONFIGS];
103     FT_Pos*           positions;
104
105     /* during each pass, use these instead */
106     FT_Int            num_stems;
107     AH_Stem*          stems;
108
109     FT_Int            num_springs;
110     AH_Spring*        springs;
111     FT_Bool           vertical;
112
113     FT_Fixed          tension_scale;
114     FT_Pos            tension_threshold;
115
116   } AH_Optimizer;
117
118
119   /* loads the outline into the optimizer */
120   int  AH_Optimizer_Init( AH_Optimizer*  optimizer,
121                           AH_Outline*    outline,
122                           FT_Memory      memory );
123
124
125   /* compute optimal outline */
126   void  AH_Optimizer_Compute( AH_Optimizer*  optimizer );
127
128
129   /* release the optimization data */
130   void AH_Optimizer_Done( AH_Optimizer*  optimizer );
131
132
133 #endif /* AHOPTIM_H */
134
135
136 /* END */