ref: c8b187f9db503465460d8bafa2d7a758bbcf59ca
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 */