1 /****************************************************************************
5 * PostScript hinting algorithm (specification).
7 * Copyright (C) 2001-2020 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.
30 /* handle to Hint structure */
31 typedef struct PSH_HintRec_* PSH_Hint;
35 #define PSH_HINT_GHOST PS_HINT_FLAG_GHOST
36 #define PSH_HINT_BOTTOM PS_HINT_FLAG_BOTTOM
37 #define PSH_HINT_ACTIVE 4U
38 #define PSH_HINT_FITTED 8U
41 #define psh_hint_is_active( x ) ( ( (x)->flags & PSH_HINT_ACTIVE ) != 0 )
42 #define psh_hint_is_ghost( x ) ( ( (x)->flags & PSH_HINT_GHOST ) != 0 )
43 #define psh_hint_is_fitted( x ) ( ( (x)->flags & PSH_HINT_FITTED ) != 0 )
45 #define psh_hint_activate( x ) (x)->flags |= PSH_HINT_ACTIVE
46 #define psh_hint_deactivate( x ) (x)->flags &= ~PSH_HINT_ACTIVE
47 #define psh_hint_set_fitted( x ) (x)->flags |= PSH_HINT_FITTED
51 typedef struct PSH_HintRec_
64 /* this is an interpolation zone used for strong points; */
65 /* weak points are interpolated according to their strong */
67 typedef struct PSH_ZoneRec_
74 } PSH_ZoneRec, *PSH_Zone;
77 typedef struct PSH_Hint_TableRec_
83 PSH_Hint* sort_global;
87 PS_Mask_Table hint_masks;
88 PS_Mask_Table counter_masks;
90 } PSH_Hint_TableRec, *PSH_Hint_Table;
93 typedef struct PSH_PointRec_* PSH_Point;
94 typedef struct PSH_ContourRec_* PSH_Contour;
105 #define PSH_DIR_HORIZONTAL 2
106 #define PSH_DIR_VERTICAL 1
108 #define PSH_DIR_COMPARE( d1, d2 ) ( (d1) == (d2) || (d1) == -(d2) )
109 #define PSH_DIR_IS_HORIZONTAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_HORIZONTAL )
110 #define PSH_DIR_IS_VERTICAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_VERTICAL )
113 /* the following bit-flags are computed once by the glyph */
114 /* analyzer, for both dimensions */
115 #define PSH_POINT_OFF 1U /* point is off the curve */
116 #define PSH_POINT_SMOOTH 2U /* point is smooth */
117 #define PSH_POINT_INFLEX 4U /* point is inflection */
120 #define psh_point_is_smooth( p ) ( (p)->flags & PSH_POINT_SMOOTH )
121 #define psh_point_is_off( p ) ( (p)->flags & PSH_POINT_OFF )
122 #define psh_point_is_inflex( p ) ( (p)->flags & PSH_POINT_INFLEX )
124 #define psh_point_set_smooth( p ) (p)->flags |= PSH_POINT_SMOOTH
125 #define psh_point_set_off( p ) (p)->flags |= PSH_POINT_OFF
126 #define psh_point_set_inflex( p ) (p)->flags |= PSH_POINT_INFLEX
129 /* the following bit-flags are re-computed for each dimension */
130 #define PSH_POINT_STRONG 16U /* point is strong */
131 #define PSH_POINT_FITTED 32U /* point is already fitted */
132 #define PSH_POINT_EXTREMUM 64U /* point is local extremum */
133 #define PSH_POINT_POSITIVE 128U /* extremum has positive contour flow */
134 #define PSH_POINT_NEGATIVE 256U /* extremum has negative contour flow */
135 #define PSH_POINT_EDGE_MIN 512U /* point is aligned to left/bottom stem edge */
136 #define PSH_POINT_EDGE_MAX 1024U /* point is aligned to top/right stem edge */
139 #define psh_point_is_strong( p ) ( (p)->flags2 & PSH_POINT_STRONG )
140 #define psh_point_is_fitted( p ) ( (p)->flags2 & PSH_POINT_FITTED )
141 #define psh_point_is_extremum( p ) ( (p)->flags2 & PSH_POINT_EXTREMUM )
142 #define psh_point_is_positive( p ) ( (p)->flags2 & PSH_POINT_POSITIVE )
143 #define psh_point_is_negative( p ) ( (p)->flags2 & PSH_POINT_NEGATIVE )
144 #define psh_point_is_edge_min( p ) ( (p)->flags2 & PSH_POINT_EDGE_MIN )
145 #define psh_point_is_edge_max( p ) ( (p)->flags2 & PSH_POINT_EDGE_MAX )
147 #define psh_point_set_strong( p ) (p)->flags2 |= PSH_POINT_STRONG
148 #define psh_point_set_fitted( p ) (p)->flags2 |= PSH_POINT_FITTED
149 #define psh_point_set_extremum( p ) (p)->flags2 |= PSH_POINT_EXTREMUM
150 #define psh_point_set_positive( p ) (p)->flags2 |= PSH_POINT_POSITIVE
151 #define psh_point_set_negative( p ) (p)->flags2 |= PSH_POINT_NEGATIVE
152 #define psh_point_set_edge_min( p ) (p)->flags2 |= PSH_POINT_EDGE_MIN
153 #define psh_point_set_edge_max( p ) (p)->flags2 |= PSH_POINT_EDGE_MAX
156 typedef struct PSH_PointRec_
181 typedef struct PSH_ContourRec_
189 typedef struct PSH_GlyphRec_
192 FT_UInt num_contours;
195 PSH_Contour contours;
200 PSH_Hint_TableRec hint_tables[2];
206 FT_Bool do_horz_hints;
207 FT_Bool do_vert_hints;
208 FT_Bool do_horz_snapping;
209 FT_Bool do_vert_snapping;
210 FT_Bool do_stem_adjust;
212 } PSH_GlyphRec, *PSH_Glyph;
216 extern PSH_Hint_Table ps_debug_hint_table;
219 (*PSH_HintFunc)( PSH_Hint hint,
222 extern PSH_HintFunc ps_debug_hint_func;
224 extern PSH_Glyph ps_debug_glyph;
229 ps_hints_apply( PS_Hints ps_hints,
232 FT_Render_Mode hint_mode );
238 #endif /* PSHALGO_H_ */