322 lines
13 KiB
C
322 lines
13 KiB
C
/***************************************************************************/
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/* */
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/* t1gload.h */
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/* */
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/* Type 1 Glyph Loader (specification). */
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/* */
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/* Copyright 1996-2000 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 T1GLOAD_H
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#define T1GLOAD_H
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#ifdef FT_FLAT_COMPILE
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#include "t1objs.h"
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#else
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#include <type1/t1objs.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct T1_Builder_ T1_Builder;
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typedef FT_Error (*T1_Builder_EndChar)( T1_Builder* loader );
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typedef FT_Error (*T1_Builder_Sbw)( T1_Builder* loader,
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FT_Pos sbx,
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FT_Pos sby,
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FT_Pos wx,
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FT_Pos wy );
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typedef FT_Error (*T1_Builder_ClosePath)( T1_Builder* loader );
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typedef FT_Error (*T1_Builder_RLineTo)( T1_Builder* loader,
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FT_Pos dx,
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FT_Pos dy );
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typedef FT_Error (*T1_Builder_RMoveTo)( T1_Builder* loader,
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FT_Pos dx,
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FT_Pos dy );
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typedef FT_Error (*T1_Builder_RCurveTo)( T1_Builder* loader,
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FT_Pos dx1,
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FT_Pos dy1,
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FT_Pos dx2,
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FT_Pos dy2,
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FT_Pos dx3,
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FT_Pos dy3 );
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/*************************************************************************/
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/* */
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/* <Structure> */
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/* T1_Builder_Funcs */
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/* */
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/* <Description> */
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/* A structure to store the address of various functions used by a */
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/* glyph builder to implement the outline's `path construction'. */
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/* */
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typedef struct T1_Builder_Funcs_
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{
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T1_Builder_EndChar end_char;
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T1_Builder_Sbw set_bearing_point;
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T1_Builder_ClosePath close_path;
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T1_Builder_RLineTo rline_to;
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T1_Builder_RMoveTo rmove_to;
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T1_Builder_RCurveTo rcurve_to;
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} T1_Builder_Funcs;
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/*************************************************************************/
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/* */
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/* <Structure> */
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/* T1_Builder */
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/* */
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/* <Description> */
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/* A structure used during glyph loading to store its outline. */
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/* */
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/* <Fields> */
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/* memory :: The current memory object. */
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/* */
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/* face :: The current face object. */
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/* */
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/* size :: The current size object. */
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/* */
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/* glyph :: The current glyph slot. */
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/* */
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/* loader :: The current glyph loader. */
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/* */
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/* current :: The current glyph outline. */
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/* */
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/* base :: The base glyph outline. */
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/* */
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/* last :: The last point position. */
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/* */
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/* scale_x :: The horizontal scale (FUnits to sub-pixels). */
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/* */
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/* scale_y :: The vertical scale (FUnits to sub-pixels). */
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/* */
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/* pos_x :: The horizontal translation (for composite glyphs). */
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/* */
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/* pos_y :: The vertical translation (for composite glyphs). */
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/* */
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/* left_bearing :: The left side bearing point. */
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/* */
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/* advance :: The horizontal advance vector. */
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/* */
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/* no_recurse :: */
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/* */
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/* bbox :: The glyph's bounding box. */
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/* */
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/* path_begun :: A flag which indicates that a new path has begun. */
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/* */
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/* load_points :: A flag which indicates, if not set, that no points */
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/* are loaded. */
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/* */
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/* pass :: The pass number for multi-pass hinters. */
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/* */
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/* hint_point :: The index of the next point to hint. */
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/* */
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/* funcs :: A table of builder functions used to perform the */
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/* outline's path construction. */
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/* */
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struct T1_Builder_
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{
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FT_Memory memory;
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T1_Face face;
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T1_Size size;
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T1_GlyphSlot glyph;
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FT_GlyphLoader* loader;
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FT_Outline* current; /* the current glyph outline */
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FT_Outline* base; /* the composite glyph outline */
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FT_Vector last;
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FT_Fixed scale_x;
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FT_Fixed scale_y;
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FT_Pos pos_x;
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FT_Pos pos_y;
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FT_Vector left_bearing;
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FT_Vector advance;
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FT_Bool no_recurse;
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FT_BBox bbox; /* bounding box */
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FT_Bool path_begun;
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FT_Bool load_points;
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FT_Int pass;
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FT_Int hint_point;
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/* path construction function interface */
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T1_Builder_Funcs funcs;
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};
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typedef FT_Error (*T1_Hinter_ChangeHints)( T1_Builder* builder );
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typedef FT_Error (*T1_Hinter_DotSection)( T1_Builder* builder );
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typedef FT_Error (*T1_Hinter_Stem)( T1_Builder* builder,
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FT_Pos pos,
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FT_Pos width,
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FT_Bool vertical );
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typedef FT_Error (*T1_Hinter_Stem3)( T1_Builder* builder,
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FT_Pos pos0,
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FT_Pos width0,
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FT_Pos pos1,
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FT_Pos width1,
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FT_Pos pos2,
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FT_Pos width2,
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FT_Bool vertical );
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/*************************************************************************/
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/* */
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/* <Structure> */
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/* T1_Hinter_Funcs */
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/* */
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/* <Description> */
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/* A structure to store the address of various functions used by a */
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/* Type 1 hinter to perform outline hinting. */
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/* */
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typedef struct T1_Hinter_Func_
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{
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T1_Hinter_ChangeHints change_hints;
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T1_Hinter_DotSection dot_section;
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T1_Hinter_Stem stem;
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T1_Hinter_Stem3 stem3;
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} T1_Hinter_Funcs;
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typedef enum T1_Operator_
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{
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op_none = 0,
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op_endchar,
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op_hsbw,
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op_seac,
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op_sbw,
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op_closepath,
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op_hlineto,
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op_hmoveto,
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op_hvcurveto,
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op_rlineto,
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op_rmoveto,
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op_rrcurveto,
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op_vhcurveto,
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op_vlineto,
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op_vmoveto,
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op_dotsection,
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op_hstem,
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op_hstem3,
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op_vstem,
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op_vstem3,
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op_div,
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op_callothersubr,
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op_callsubr,
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op_pop,
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op_return,
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op_setcurrentpoint,
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op_max /* never remove this one */
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} T1_Operator;
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/* execution context charstring zone */
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typedef struct T1_Decoder_Zone_
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{
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FT_Byte* base;
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FT_Byte* limit;
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FT_Byte* cursor;
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} T1_Decoder_Zone;
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typedef struct T1_Decoder_
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{
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T1_Builder builder;
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T1_Hinter_Funcs hinter;
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FT_Int stack[T1_MAX_CHARSTRINGS_OPERANDS];
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FT_Int* top;
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T1_Decoder_Zone zones[T1_MAX_SUBRS_CALLS + 1];
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T1_Decoder_Zone* zone;
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FT_Int flex_state;
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FT_Int num_flex_vectors;
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FT_Vector flex_vectors[7];
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} T1_Decoder;
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LOCAL_DEF
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void T1_Init_Builder( T1_Builder* builder,
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T1_Face face,
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T1_Size size,
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T1_GlyphSlot glyph,
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const T1_Builder_Funcs* funcs );
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LOCAL_DEF
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void T1_Done_Builder( T1_Builder* builder );
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LOCAL_DEF
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void T1_Init_Decoder( T1_Decoder* decoder,
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const T1_Hinter_Funcs* funcs );
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LOCAL_DEF
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FT_Error T1_Compute_Max_Advance( T1_Face face,
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FT_Int* max_advance );
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LOCAL_DEF
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FT_Error T1_Parse_CharStrings( T1_Decoder* decoder,
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FT_Byte* charstring_base,
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FT_Int charstring_len,
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FT_Int num_subrs,
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FT_Byte** subrs_base,
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FT_Int* subrs_len );
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LOCAL_DEF
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FT_Error T1_Add_Points( T1_Builder* builder,
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FT_Int num_points );
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LOCAL_DEF
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FT_Error T1_Add_Contours( T1_Builder* builder,
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FT_Int num_contours );
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LOCAL_DEF
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FT_Error T1_Load_Glyph( T1_GlyphSlot glyph,
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T1_Size size,
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FT_Int glyph_index,
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FT_Int load_flags );
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#ifdef __cplusplus
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}
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#endif
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#endif /* T1GLOAD_H */
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/* END */
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