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/***************************************************************************/ |
/* */ |
/* pshalgo.h */ |
/* */ |
/* PostScript hinting algorithm (specification). */ |
/* */ |
/* Copyright 2001-2003, 2008, 2013 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. */ |
/* */ |
/***************************************************************************/ |
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#ifndef __PSHALGO_H__ |
#define __PSHALGO_H__ |
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#include "pshrec.h" |
#include "pshglob.h" |
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FT_BEGIN_HEADER |
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/* handle to Hint structure */ |
typedef struct PSH_HintRec_* PSH_Hint; |
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/* hint bit-flags */ |
typedef enum PSH_Hint_Flags_ |
{ |
PSH_HINT_GHOST = PS_HINT_FLAG_GHOST, |
PSH_HINT_BOTTOM = PS_HINT_FLAG_BOTTOM, |
PSH_HINT_ACTIVE = 4, |
PSH_HINT_FITTED = 8 |
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} PSH_Hint_Flags; |
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#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 ) |
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#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 |
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/* 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; |
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} PSH_HintRec; |
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/* 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; |
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} PSH_ZoneRec, *PSH_Zone; |
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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; |
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} PSH_Hint_TableRec, *PSH_Hint_Table; |
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typedef struct PSH_PointRec_* PSH_Point; |
typedef struct PSH_ContourRec_* PSH_Contour; |
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enum |
{ |
PSH_DIR_NONE = 4, |
PSH_DIR_UP = -1, |
PSH_DIR_DOWN = 1, |
PSH_DIR_LEFT = -2, |
PSH_DIR_RIGHT = 2 |
}; |
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#define PSH_DIR_HORIZONTAL 2 |
#define PSH_DIR_VERTICAL 1 |
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#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 ) |
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/* the following bit-flags are computed once by the glyph */ |
/* analyzer, for both dimensions */ |
enum |
{ |
PSH_POINT_OFF = 1, /* point is off the curve */ |
PSH_POINT_SMOOTH = 2, /* point is smooth */ |
PSH_POINT_INFLEX = 4 /* point is inflection */ |
}; |
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#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 ) |
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#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 |
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/* the following bit-flags are re-computed for each dimension */ |
enum |
{ |
PSH_POINT_STRONG = 16, /* point is strong */ |
PSH_POINT_FITTED = 32, /* point is already fitted */ |
PSH_POINT_EXTREMUM = 64, /* point is local extremum */ |
PSH_POINT_POSITIVE = 128, /* extremum has positive contour flow */ |
PSH_POINT_NEGATIVE = 256, /* extremum has negative contour flow */ |
PSH_POINT_EDGE_MIN = 512, /* point is aligned to left/bottom stem edge */ |
PSH_POINT_EDGE_MAX = 1024 /* point is aligned to top/right stem edge */ |
}; |
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#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 ) |
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#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 |
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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 |
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} PSH_PointRec; |
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typedef struct PSH_ContourRec_ |
{ |
PSH_Point start; |
FT_UInt count; |
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} PSH_ContourRec; |
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typedef struct PSH_GlyphRec_ |
{ |
FT_UInt num_points; |
FT_UInt num_contours; |
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PSH_Point points; |
PSH_Contour contours; |
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FT_Memory memory; |
FT_Outline* outline; |
PSH_Globals globals; |
PSH_Hint_TableRec hint_tables[2]; |
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FT_Bool vertical; |
FT_Int major_dir; |
FT_Int minor_dir; |
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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; |
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} PSH_GlyphRec, *PSH_Glyph; |
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#ifdef DEBUG_HINTER |
extern PSH_Hint_Table ps_debug_hint_table; |
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typedef void |
(*PSH_HintFunc)( PSH_Hint hint, |
FT_Bool vertical ); |
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extern PSH_HintFunc ps_debug_hint_func; |
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extern PSH_Glyph ps_debug_glyph; |
#endif |
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extern FT_Error |
ps_hints_apply( PS_Hints ps_hints, |
FT_Outline* outline, |
PSH_Globals globals, |
FT_Render_Mode hint_mode ); |
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FT_END_HEADER |
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#endif /* __PSHALGO_H__ */ |
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/* END */ |