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/****************************************************************************
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*
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* pshalgo.h
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*
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* PostScript hinting algorithm (specification).
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*
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* Copyright (C) 2001-2019 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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#ifndef PSHALGO_H_
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#define PSHALGO_H_
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#include "pshrec.h"
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#include "pshglob.h"
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FT_BEGIN_HEADER
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/* handle to Hint structure */
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typedef struct PSH_HintRec_* PSH_Hint;
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/* hint bit-flags */
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#define PSH_HINT_GHOST PS_HINT_FLAG_GHOST
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#define PSH_HINT_BOTTOM PS_HINT_FLAG_BOTTOM
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#define PSH_HINT_ACTIVE 4U
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#define PSH_HINT_FITTED 8U
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#define psh_hint_is_active( x ) ( ( (x)->flags & PSH_HINT_ACTIVE ) != 0 )
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#define psh_hint_is_ghost( x ) ( ( (x)->flags & PSH_HINT_GHOST ) != 0 )
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#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
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#define psh_hint_deactivate( x ) (x)->flags &= ~PSH_HINT_ACTIVE
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#define psh_hint_set_fitted( x ) (x)->flags |= PSH_HINT_FITTED
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/* hint structure */
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typedef struct PSH_HintRec_
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{
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FT_Int org_pos;
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FT_Int org_len;
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FT_Pos cur_pos;
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FT_Pos cur_len;
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FT_UInt flags;
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PSH_Hint parent;
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FT_Int order;
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} PSH_HintRec;
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/* this is an interpolation zone used for strong points; */
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/* weak points are interpolated according to their strong */
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/* neighbours */
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typedef struct PSH_ZoneRec_
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{
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FT_Fixed scale;
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FT_Fixed delta;
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FT_Pos min;
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FT_Pos max;
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} PSH_ZoneRec, *PSH_Zone;
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typedef struct PSH_Hint_TableRec_
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{
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FT_UInt max_hints;
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FT_UInt num_hints;
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PSH_Hint hints;
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PSH_Hint* sort;
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PSH_Hint* sort_global;
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FT_UInt num_zones;
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PSH_ZoneRec* zones;
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PSH_Zone zone;
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PS_Mask_Table hint_masks;
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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;
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typedef struct PSH_ContourRec_* PSH_Contour;
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enum
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{
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PSH_DIR_NONE = 4,
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PSH_DIR_UP = -1,
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PSH_DIR_DOWN = 1,
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PSH_DIR_LEFT = -2,
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PSH_DIR_RIGHT = 2
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};
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#define PSH_DIR_HORIZONTAL 2
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#define PSH_DIR_VERTICAL 1
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#define PSH_DIR_COMPARE( d1, d2 ) ( (d1) == (d2) || (d1) == -(d2) )
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#define PSH_DIR_IS_HORIZONTAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_HORIZONTAL )
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#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 */
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/* analyzer, for both dimensions */
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#define PSH_POINT_OFF 1U /* point is off the curve */
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#define PSH_POINT_SMOOTH 2U /* point is smooth */
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#define PSH_POINT_INFLEX 4U /* point is inflection */
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#define psh_point_is_smooth( p ) ( (p)->flags & PSH_POINT_SMOOTH )
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#define psh_point_is_off( p ) ( (p)->flags & PSH_POINT_OFF )
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#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
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#define psh_point_set_off( p ) (p)->flags |= PSH_POINT_OFF
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#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 */
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#define PSH_POINT_STRONG 16U /* point is strong */
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#define PSH_POINT_FITTED 32U /* point is already fitted */
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#define PSH_POINT_EXTREMUM 64U /* point is local extremum */
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#define PSH_POINT_POSITIVE 128U /* extremum has positive contour flow */
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#define PSH_POINT_NEGATIVE 256U /* extremum has negative contour flow */
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#define PSH_POINT_EDGE_MIN 512U /* point is aligned to left/bottom stem edge */
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#define PSH_POINT_EDGE_MAX 1024U /* point is aligned to top/right stem edge */
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#define psh_point_is_strong( p ) ( (p)->flags2 & PSH_POINT_STRONG )
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#define psh_point_is_fitted( p ) ( (p)->flags2 & PSH_POINT_FITTED )
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#define psh_point_is_extremum( p ) ( (p)->flags2 & PSH_POINT_EXTREMUM )
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#define psh_point_is_positive( p ) ( (p)->flags2 & PSH_POINT_POSITIVE )
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#define psh_point_is_negative( p ) ( (p)->flags2 & PSH_POINT_NEGATIVE )
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#define psh_point_is_edge_min( p ) ( (p)->flags2 & PSH_POINT_EDGE_MIN )
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#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
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#define psh_point_set_fitted( p ) (p)->flags2 |= PSH_POINT_FITTED
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#define psh_point_set_extremum( p ) (p)->flags2 |= PSH_POINT_EXTREMUM
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#define psh_point_set_positive( p ) (p)->flags2 |= PSH_POINT_POSITIVE
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#define psh_point_set_negative( p ) (p)->flags2 |= PSH_POINT_NEGATIVE
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#define psh_point_set_edge_min( p ) (p)->flags2 |= PSH_POINT_EDGE_MIN
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#define psh_point_set_edge_max( p ) (p)->flags2 |= PSH_POINT_EDGE_MAX
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typedef struct PSH_PointRec_
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{
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PSH_Point prev;
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PSH_Point next;
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PSH_Contour contour;
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FT_UInt flags;
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FT_UInt flags2;
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FT_Char dir_in;
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FT_Char dir_out;
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PSH_Hint hint;
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FT_Pos org_u;
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FT_Pos org_v;
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FT_Pos cur_u;
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#ifdef DEBUG_HINTER
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FT_Pos org_x;
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FT_Pos cur_x;
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FT_Pos org_y;
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FT_Pos cur_y;
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FT_UInt flags_x;
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FT_UInt flags_y;
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#endif
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} PSH_PointRec;
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typedef struct PSH_ContourRec_
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{
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PSH_Point start;
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FT_UInt count;
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} PSH_ContourRec;
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typedef struct PSH_GlyphRec_
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{
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FT_UInt num_points;
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FT_UInt num_contours;
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PSH_Point points;
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PSH_Contour contours;
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FT_Memory memory;
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FT_Outline* outline;
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PSH_Globals globals;
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PSH_Hint_TableRec hint_tables[2];
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FT_Bool vertical;
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FT_Int major_dir;
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FT_Int minor_dir;
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FT_Bool do_horz_hints;
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FT_Bool do_vert_hints;
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FT_Bool do_horz_snapping;
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FT_Bool do_vert_snapping;
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FT_Bool do_stem_adjust;
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} PSH_GlyphRec, *PSH_Glyph;
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#ifdef DEBUG_HINTER
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extern PSH_Hint_Table ps_debug_hint_table;
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typedef void
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(*PSH_HintFunc)( PSH_Hint hint,
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FT_Bool vertical );
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extern PSH_HintFunc ps_debug_hint_func;
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extern PSH_Glyph ps_debug_glyph;
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#endif
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extern FT_Error
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ps_hints_apply( PS_Hints ps_hints,
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FT_Outline* outline,
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PSH_Globals globals,
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FT_Render_Mode hint_mode );
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FT_END_HEADER
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#endif /* PSHALGO_H_ */
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/* END */
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