1 /***************************************************************************/
5 /* PostScript hinting algorithm (specification). */
7 /* Copyright 2001, 2002, 2003, 2008 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
16 /***************************************************************************/
25 #include FT_TRIGONOMETRY_H
31 /* handle to Hint structure */
32 typedef struct PSH_HintRec_* PSH_Hint;
35 typedef enum PSH_Hint_Flags_
37 PSH_HINT_GHOST = PS_HINT_FLAG_GHOST,
38 PSH_HINT_BOTTOM = PS_HINT_FLAG_BOTTOM,
45 #define psh_hint_is_active( x ) ( ( (x)->flags & PSH_HINT_ACTIVE ) != 0 )
46 #define psh_hint_is_ghost( x ) ( ( (x)->flags & PSH_HINT_GHOST ) != 0 )
47 #define psh_hint_is_fitted( x ) ( ( (x)->flags & PSH_HINT_FITTED ) != 0 )
49 #define psh_hint_activate( x ) (x)->flags |= PSH_HINT_ACTIVE
50 #define psh_hint_deactivate( x ) (x)->flags &= ~PSH_HINT_ACTIVE
51 #define psh_hint_set_fitted( x ) (x)->flags |= PSH_HINT_FITTED
54 typedef struct PSH_HintRec_
67 /* this is an interpolation zone used for strong points; */
68 /* weak points are interpolated according to their strong */
70 typedef struct PSH_ZoneRec_
77 } PSH_ZoneRec, *PSH_Zone;
80 typedef struct PSH_Hint_TableRec_
86 PSH_Hint* sort_global;
90 PS_Mask_Table hint_masks;
91 PS_Mask_Table counter_masks;
93 } PSH_Hint_TableRec, *PSH_Hint_Table;
96 typedef struct PSH_PointRec_* PSH_Point;
97 typedef struct PSH_ContourRec_* PSH_Contour;
108 #define PSH_DIR_HORIZONTAL 2
109 #define PSH_DIR_VERTICAL 1
111 #define PSH_DIR_COMPARE( d1, d2 ) ( (d1) == (d2) || (d1) == -(d2) )
112 #define PSH_DIR_IS_HORIZONTAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_HORIZONTAL )
113 #define PSH_DIR_IS_VERTICAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_VERTICAL )
116 /* the following bit-flags are computed once by the glyph */
117 /* analyzer, for both dimensions */
120 PSH_POINT_OFF = 1, /* point is off the curve */
121 PSH_POINT_SMOOTH = 2, /* point is smooth */
122 PSH_POINT_INFLEX = 4 /* point is inflection */
125 #define psh_point_is_smooth( p ) ( (p)->flags & PSH_POINT_SMOOTH )
126 #define psh_point_is_off( p ) ( (p)->flags & PSH_POINT_OFF )
127 #define psh_point_is_inflex( p ) ( (p)->flags & PSH_POINT_INFLEX )
129 #define psh_point_set_smooth( p ) (p)->flags |= PSH_POINT_SMOOTH
130 #define psh_point_set_off( p ) (p)->flags |= PSH_POINT_OFF
131 #define psh_point_set_inflex( p ) (p)->flags |= PSH_POINT_INFLEX
133 /* the following bit-flags are re-computed for each dimension */
136 PSH_POINT_STRONG = 16, /* point is strong */
137 PSH_POINT_FITTED = 32, /* point is already fitted */
138 PSH_POINT_EXTREMUM = 64, /* point is local extremum */
139 PSH_POINT_POSITIVE = 128, /* extremum has positive contour flow */
140 PSH_POINT_NEGATIVE = 256, /* extremum has negative contour flow */
141 PSH_POINT_EDGE_MIN = 512, /* point is aligned to left/bottom stem edge */
142 PSH_POINT_EDGE_MAX = 1024 /* point is aligned to top/right stem edge */
145 #define psh_point_is_strong( p ) ( (p)->flags2 & PSH_POINT_STRONG )
146 #define psh_point_is_fitted( p ) ( (p)->flags2 & PSH_POINT_FITTED )
147 #define psh_point_is_extremum( p ) ( (p)->flags2 & PSH_POINT_EXTREMUM )
148 #define psh_point_is_positive( p ) ( (p)->flags2 & PSH_POINT_POSITIVE )
149 #define psh_point_is_negative( p ) ( (p)->flags2 & PSH_POINT_NEGATIVE )
150 #define psh_point_is_edge_min( p ) ( (p)->flags2 & PSH_POINT_EDGE_MIN )
151 #define psh_point_is_edge_max( p ) ( (p)->flags2 & PSH_POINT_EDGE_MAX )
153 #define psh_point_set_strong( p ) (p)->flags2 |= PSH_POINT_STRONG
154 #define psh_point_set_fitted( p ) (p)->flags2 |= PSH_POINT_FITTED
155 #define psh_point_set_extremum( p ) (p)->flags2 |= PSH_POINT_EXTREMUM
156 #define psh_point_set_positive( p ) (p)->flags2 |= PSH_POINT_POSITIVE
157 #define psh_point_set_negative( p ) (p)->flags2 |= PSH_POINT_NEGATIVE
158 #define psh_point_set_edge_min( p ) (p)->flags2 |= PSH_POINT_EDGE_MIN
159 #define psh_point_set_edge_max( p ) (p)->flags2 |= PSH_POINT_EDGE_MAX
162 typedef struct PSH_PointRec_
189 #define PSH_POINT_EQUAL_ORG( a, b ) ( (a)->org_u == (b)->org_u && \
190 (a)->org_v == (b)->org_v )
192 #define PSH_POINT_ANGLE( a, b ) FT_Atan2( (b)->org_u - (a)->org_u, \
193 (b)->org_v - (a)->org_v )
195 typedef struct PSH_ContourRec_
203 typedef struct PSH_GlyphRec_
206 FT_UInt num_contours;
209 PSH_Contour contours;
214 PSH_Hint_TableRec hint_tables[2];
220 FT_Bool do_horz_hints;
221 FT_Bool do_vert_hints;
222 FT_Bool do_horz_snapping;
223 FT_Bool do_vert_snapping;
224 FT_Bool do_stem_adjust;
226 } PSH_GlyphRec, *PSH_Glyph;
230 extern PSH_Hint_Table ps_debug_hint_table;
233 (*PSH_HintFunc)( PSH_Hint hint,
236 extern PSH_HintFunc ps_debug_hint_func;
238 extern PSH_Glyph ps_debug_glyph;
243 ps_hints_apply( PS_Hints ps_hints,
246 FT_Render_Mode hint_mode );
252 #endif /* __PSHALGO_H__ */