ref: b7af62b250e5dff30320a181ca9d53ab5a7c276d
dir: /libfreetype/pshalgo3.h/
/***************************************************************************/
/* */
/* 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 */