/***************************************************************************/ | |
/* */ | |
/* pshalgo.h */ | |
/* */ | |
/* PostScript hinting algorithm (specification). */ | |
/* */ | |
/* Copyright 2001-2015 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 __PSHALGO_H__ | |
#define __PSHALGO_H__ | |
#include "pshrec.h" | |
#include "pshglob.h" | |
FT_BEGIN_HEADER | |
/* handle to Hint structure */ | |
typedef struct PSH_HintRec_* PSH_Hint; | |
/* hint bit-flags */ | |
#define PSH_HINT_GHOST PS_HINT_FLAG_GHOST | |
#define PSH_HINT_BOTTOM PS_HINT_FLAG_BOTTOM | |
#define PSH_HINT_ACTIVE 4U | |
#define PSH_HINT_FITTED 8U | |
#define psh_hint_is_active( x ) ( ( (x)->flags & PSH_HINT_ACTIVE ) != 0 ) | |
#define psh_hint_is_ghost( x ) ( ( (x)->flags & PSH_HINT_GHOST ) != 0 ) | |
#define psh_hint_is_fitted( x ) ( ( (x)->flags & PSH_HINT_FITTED ) != 0 ) | |
#define psh_hint_activate( x ) (x)->flags |= PSH_HINT_ACTIVE | |
#define psh_hint_deactivate( x ) (x)->flags &= ~PSH_HINT_ACTIVE | |
#define psh_hint_set_fitted( x ) (x)->flags |= PSH_HINT_FITTED | |
/* hint structure */ | |
typedef struct PSH_HintRec_ | |
{ | |
FT_Int org_pos; | |
FT_Int org_len; | |
FT_Pos cur_pos; | |
FT_Pos cur_len; | |
FT_UInt flags; | |
PSH_Hint parent; | |
FT_Int order; | |
} PSH_HintRec; | |
/* this is an interpolation zone used for strong points; */ | |
/* weak points are interpolated according to their strong */ | |
/* neighbours */ | |
typedef struct PSH_ZoneRec_ | |
{ | |
FT_Fixed scale; | |
FT_Fixed delta; | |
FT_Pos min; | |
FT_Pos max; | |
} PSH_ZoneRec, *PSH_Zone; | |
typedef struct PSH_Hint_TableRec_ | |
{ | |
FT_UInt max_hints; | |
FT_UInt num_hints; | |
PSH_Hint hints; | |
PSH_Hint* sort; | |
PSH_Hint* sort_global; | |
FT_UInt num_zones; | |
PSH_ZoneRec* zones; | |
PSH_Zone zone; | |
PS_Mask_Table hint_masks; | |
PS_Mask_Table counter_masks; | |
} PSH_Hint_TableRec, *PSH_Hint_Table; | |
typedef struct PSH_PointRec_* PSH_Point; | |
typedef struct PSH_ContourRec_* PSH_Contour; | |
enum | |
{ | |
PSH_DIR_NONE = 4, | |
PSH_DIR_UP = -1, | |
PSH_DIR_DOWN = 1, | |
PSH_DIR_LEFT = -2, | |
PSH_DIR_RIGHT = 2 | |
}; | |
#define PSH_DIR_HORIZONTAL 2 | |
#define PSH_DIR_VERTICAL 1 | |
#define PSH_DIR_COMPARE( d1, d2 ) ( (d1) == (d2) || (d1) == -(d2) ) | |
#define PSH_DIR_IS_HORIZONTAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_HORIZONTAL ) | |
#define PSH_DIR_IS_VERTICAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_VERTICAL ) | |
/* the following bit-flags are computed once by the glyph */ | |
/* analyzer, for both dimensions */ | |
#define PSH_POINT_OFF 1U /* point is off the curve */ | |
#define PSH_POINT_SMOOTH 2U /* point is smooth */ | |
#define PSH_POINT_INFLEX 4U /* point is inflection */ | |
#define psh_point_is_smooth( p ) ( (p)->flags & PSH_POINT_SMOOTH ) | |
#define psh_point_is_off( p ) ( (p)->flags & PSH_POINT_OFF ) | |
#define psh_point_is_inflex( p ) ( (p)->flags & PSH_POINT_INFLEX ) | |
#define psh_point_set_smooth( p ) (p)->flags |= PSH_POINT_SMOOTH | |
#define psh_point_set_off( p ) (p)->flags |= PSH_POINT_OFF | |
#define psh_point_set_inflex( p ) (p)->flags |= PSH_POINT_INFLEX | |
/* the following bit-flags are re-computed for each dimension */ | |
#define PSH_POINT_STRONG 16U /* point is strong */ | |
#define PSH_POINT_FITTED 32U /* point is already fitted */ | |
#define PSH_POINT_EXTREMUM 64U /* point is local extremum */ | |
#define PSH_POINT_POSITIVE 128U /* extremum has positive contour flow */ | |
#define PSH_POINT_NEGATIVE 256U /* extremum has negative contour flow */ | |
#define PSH_POINT_EDGE_MIN 512U /* point is aligned to left/bottom stem edge */ | |
#define PSH_POINT_EDGE_MAX 1024U /* point is aligned to top/right stem edge */ | |
#define psh_point_is_strong( p ) ( (p)->flags2 & PSH_POINT_STRONG ) | |
#define psh_point_is_fitted( p ) ( (p)->flags2 & PSH_POINT_FITTED ) | |
#define psh_point_is_extremum( p ) ( (p)->flags2 & PSH_POINT_EXTREMUM ) | |
#define psh_point_is_positive( p ) ( (p)->flags2 & PSH_POINT_POSITIVE ) | |
#define psh_point_is_negative( p ) ( (p)->flags2 & PSH_POINT_NEGATIVE ) | |
#define psh_point_is_edge_min( p ) ( (p)->flags2 & PSH_POINT_EDGE_MIN ) | |
#define psh_point_is_edge_max( p ) ( (p)->flags2 & PSH_POINT_EDGE_MAX ) | |
#define psh_point_set_strong( p ) (p)->flags2 |= PSH_POINT_STRONG | |
#define psh_point_set_fitted( p ) (p)->flags2 |= PSH_POINT_FITTED | |
#define psh_point_set_extremum( p ) (p)->flags2 |= PSH_POINT_EXTREMUM | |
#define psh_point_set_positive( p ) (p)->flags2 |= PSH_POINT_POSITIVE | |
#define psh_point_set_negative( p ) (p)->flags2 |= PSH_POINT_NEGATIVE | |
#define psh_point_set_edge_min( p ) (p)->flags2 |= PSH_POINT_EDGE_MIN | |
#define psh_point_set_edge_max( p ) (p)->flags2 |= PSH_POINT_EDGE_MAX | |
typedef struct PSH_PointRec_ | |
{ | |
PSH_Point prev; | |
PSH_Point next; | |
PSH_Contour contour; | |
FT_UInt flags; | |
FT_UInt flags2; | |
FT_Char dir_in; | |
FT_Char dir_out; | |
PSH_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 | |
} PSH_PointRec; | |
typedef struct PSH_ContourRec_ | |
{ | |
PSH_Point start; | |
FT_UInt count; | |
} PSH_ContourRec; | |
typedef struct PSH_GlyphRec_ | |
{ | |
FT_UInt num_points; | |
FT_UInt num_contours; | |
PSH_Point points; | |
PSH_Contour contours; | |
FT_Memory memory; | |
FT_Outline* outline; | |
PSH_Globals globals; | |
PSH_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; | |
FT_Bool do_stem_adjust; | |
} PSH_GlyphRec, *PSH_Glyph; | |
#ifdef DEBUG_HINTER | |
extern PSH_Hint_Table ps_debug_hint_table; | |
typedef void | |
(*PSH_HintFunc)( PSH_Hint hint, | |
FT_Bool vertical ); | |
extern PSH_HintFunc ps_debug_hint_func; | |
extern PSH_Glyph ps_debug_glyph; | |
#endif | |
extern FT_Error | |
ps_hints_apply( PS_Hints ps_hints, | |
FT_Outline* outline, | |
PSH_Globals globals, | |
FT_Render_Mode hint_mode ); | |
FT_END_HEADER | |
#endif /* __PSHALGO_H__ */ | |
/* END */ |