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+/***************************************************************************/
+/* */
+/* pshalgo3.h */
+/* */
+/* PostScript hinting algorithm 3 (specification). */
+/* */
+/* Copyright 2001, 2002 by */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+
+#ifndef __PSHALGO3_H__
+#define __PSHALGO3_H__
+
+
+#include "pshrec.h"
+#include "pshglob.h"
+#include FT_TRIGONOMETRY_H
+
+
+FT_BEGIN_HEADER
+
+
+ /* handle to Hint structure */
+ typedef struct PSH3_HintRec_* PSH3_Hint;
+
+ /* hint bit-flags */
+ typedef enum
+ {
+ PSH3_HINT_GHOST = PS_HINT_FLAG_GHOST,
+ PSH3_HINT_BOTTOM = PS_HINT_FLAG_BOTTOM,
+ PSH3_HINT_ACTIVE = 4,
+ PSH3_HINT_FITTED = 8
+
+ } PSH3_Hint_Flags;
+
+
+#define psh3_hint_is_active( x ) ( ( (x)->flags & PSH3_HINT_ACTIVE ) != 0 )
+#define psh3_hint_is_ghost( x ) ( ( (x)->flags & PSH3_HINT_GHOST ) != 0 )
+#define psh3_hint_is_fitted( x ) ( ( (x)->flags & PSH3_HINT_FITTED ) != 0 )
+
+#define psh3_hint_activate( x ) (x)->flags |= PSH3_HINT_ACTIVE
+#define psh3_hint_deactivate( x ) (x)->flags &= ~PSH3_HINT_ACTIVE
+#define psh3_hint_set_fitted( x ) (x)->flags |= PSH3_HINT_FITTED
+
+ /* hint structure */
+ typedef struct PSH3_HintRec_
+ {
+ FT_Int org_pos;
+ FT_Int org_len;
+ FT_Pos cur_pos;
+ FT_Pos cur_len;
+ FT_UInt flags;
+ PSH3_Hint parent;
+ FT_Int order;
+
+ } PSH3_HintRec;
+
+
+ /* this is an interpolation zone used for strong points; */
+ /* weak points are interpolated according to their strong */
+ /* neighbours */
+ typedef struct PSH3_ZoneRec_
+ {
+ FT_Fixed scale;
+ FT_Fixed delta;
+ FT_Pos min;
+ FT_Pos max;
+
+ } PSH3_ZoneRec, *PSH3_Zone;
+
+
+ typedef struct PSH3_Hint_TableRec_
+ {
+ FT_UInt max_hints;
+ FT_UInt num_hints;
+ PSH3_Hint hints;
+ PSH3_Hint* sort;
+ PSH3_Hint* sort_global;
+ FT_UInt num_zones;
+ PSH3_ZoneRec* zones;
+ PSH3_Zone zone;
+ PS_Mask_Table hint_masks;
+ PS_Mask_Table counter_masks;
+
+ } PSH3_Hint_TableRec, *PSH3_Hint_Table;
+
+
+ typedef struct PSH3_PointRec_* PSH3_Point;
+ typedef struct PSH3_ContourRec_* PSH3_Contour;
+
+ enum
+ {
+ PSH3_DIR_NONE = 4,
+ PSH3_DIR_UP = -1,
+ PSH3_DIR_DOWN = 1,
+ PSH3_DIR_LEFT = -2,
+ PSH3_DIR_RIGHT = 2
+ };
+
+#define PSH3_DIR_HORIZONTAL 2
+#define PSH3_DIR_VERTICAL 1
+
+#define PSH3_DIR_COMPARE( d1, d2 ) ( (d1) == (d2) || (d1) == -(d2) )
+#define PSH3_DIR_IS_HORIZONTAL( d ) PSH3_DIR_COMPARE( d, PSH3_DIR_HORIZONTAL )
+#define PSH3_DIR_IS_VERTICAL( d ) PSH3_DIR_COMPARE( d, PSH3_DIR_VERTICAL )
+
+
+ /* the following bit-flags are computed once by the glyph */
+ /* analyzer, for both dimensions */
+ enum
+ {
+ PSH3_POINT_OFF = 1, /* point is off the curve */
+ PSH3_POINT_SMOOTH = 2, /* point is smooth */
+ PSH3_POINT_INFLEX = 4 /* point is inflection */
+ };
+
+#define psh3_point_is_smooth( p ) ( (p)->flags & PSH3_POINT_SMOOTH )
+#define psh3_point_is_off( p ) ( (p)->flags & PSH3_POINT_OFF )
+#define psh3_point_is_inflex( p ) ( (p)->flags & PSH3_POINT_INFLEX )
+
+#define psh3_point_set_smooth( p ) (p)->flags |= PSH3_POINT_SMOOTH
+#define psh3_point_set_off( p ) (p)->flags |= PSH3_POINT_OFF
+#define psh3_point_set_inflex( p ) (p)->flags |= PSH3_POINT_INFLEX
+
+ /* the following bit-flags are re-computed for each dimension */
+ enum
+ {
+ PSH3_POINT_STRONG = 16, /* point is strong */
+ PSH3_POINT_FITTED = 32, /* point is already fitted */
+ PSH3_POINT_EXTREMUM = 64, /* point is local extremum */
+ PSH3_POINT_POSITIVE = 128, /* extremum has positive contour flow */
+ PSH3_POINT_NEGATIVE = 256, /* extremum has negative contour flow */
+ PSH3_POINT_EDGE_MIN = 512, /* point is aligned to left/bottom stem edge */
+ PSH3_POINT_EDGE_MAX = 1024 /* point is aligned to top/right stem edge */
+ };
+
+#define psh3_point_is_strong( p ) ( (p)->flags2 & PSH3_POINT_STRONG )
+#define psh3_point_is_fitted( p ) ( (p)->flags2 & PSH3_POINT_FITTED )
+#define psh3_point_is_extremum( p ) ( (p)->flags2 & PSH3_POINT_EXTREMUM )
+#define psh3_point_is_positive( p ) ( (p)->flags2 & PSH3_POINT_POSITIVE )
+#define psh3_point_is_negative( p ) ( (p)->flags2 & PSH3_POINT_NEGATIVE )
+#define psh3_point_is_edge_min( p ) ( (p)->flags2 & PSH3_POINT_EDGE_MIN )
+#define psh3_point_is_edge_max( p ) ( (p)->flags2 & PSH3_POINT_EDGE_MAX )
+
+#define psh3_point_set_strong( p ) (p)->flags2 |= PSH3_POINT_STRONG
+#define psh3_point_set_fitted( p ) (p)->flags2 |= PSH3_POINT_FITTED
+#define psh3_point_set_extremum( p ) (p)->flags2 |= PSH3_POINT_EXTREMUM
+#define psh3_point_set_positive( p ) (p)->flags2 |= PSH3_POINT_POSITIVE
+#define psh3_point_set_negative( p ) (p)->flags2 |= PSH3_POINT_NEGATIVE
+#define psh3_point_set_edge_min( p ) (p)->flags2 |= PSH3_POINT_EDGE_MIN
+#define psh3_point_set_edge_max( p ) (p)->flags2 |= PSH3_POINT_EDGE_MAX
+
+
+ typedef struct PSH3_PointRec_
+ {
+ PSH3_Point prev;
+ PSH3_Point next;
+ PSH3_Contour contour;
+ FT_UInt flags;
+ FT_UInt flags2;
+ FT_Char dir_in;
+ FT_Char dir_out;
+ FT_Angle angle_in;
+ FT_Angle angle_out;
+ PSH3_Hint hint;
+ FT_Pos org_u;
+ FT_Pos org_v;
+ FT_Pos cur_u;
+#ifdef DEBUG_HINTER
+ FT_Pos org_x;
+ FT_Pos cur_x;
+ FT_Pos org_y;
+ FT_Pos cur_y;
+ FT_UInt flags_x;
+ FT_UInt flags_y;
+#endif
+
+ } PSH3_PointRec;
+
+
+#define PSH3_POINT_EQUAL_ORG( a, b ) ( (a)->org_u == (b)->org_u && \
+ (a)->org_v == (b)->org_v )
+
+#define PSH3_POINT_ANGLE( a, b ) FT_Atan2( (b)->org_u - (a)->org_u, \
+ (b)->org_v - (a)->org_v )
+
+ typedef struct PSH3_ContourRec_
+ {
+ PSH3_Point start;
+ FT_UInt count;
+
+ } PSH3_ContourRec;
+
+
+ typedef struct PSH3_GlyphRec_
+ {
+ FT_UInt num_points;
+ FT_UInt num_contours;
+
+ PSH3_Point points;
+ PSH3_Contour contours;
+
+ FT_Memory memory;
+ FT_Outline* outline;
+ PSH_Globals globals;
+ PSH3_Hint_TableRec hint_tables[2];
+
+ FT_Bool vertical;
+ FT_Int major_dir;
+ FT_Int minor_dir;
+
+ FT_Bool do_horz_hints;
+ FT_Bool do_vert_hints;
+ FT_Bool do_horz_snapping;
+ FT_Bool do_vert_snapping;
+
+ } PSH3_GlyphRec, *PSH3_Glyph;
+
+
+#ifdef DEBUG_HINTER
+ extern PSH3_Hint_Table ps3_debug_hint_table;
+
+ typedef void
+ (*PSH3_HintFunc)( PSH3_Hint hint,
+ FT_Bool vertical );
+
+ extern PSH3_HintFunc ps3_debug_hint_func;
+
+ extern PSH3_Glyph ps3_debug_glyph;
+#endif
+
+
+ extern FT_Error
+ ps3_hints_apply( PS_Hints ps_hints,
+ FT_Outline* outline,
+ PSH_Globals globals,
+ FT_Render_Mode hint_mode );
+
+
+FT_END_HEADER
+
+
+#endif /* __PSHALGO3_H__ */
+
+
+/* END */
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