189 lines
6.8 KiB
C
189 lines
6.8 KiB
C
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/*******************************************************************
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*
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* cidgload.h 1.0
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*
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* CID-Keyed Type1 Glyph Loader.
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*
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* Copyright 1996-1998 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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* The Type 1 glyph loader uses three distinct objects to build
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* scaled and hinted outlines from a charstrings program. These are :
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*
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* - a glyph builder, CID_Builder, used to store the built outline
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*
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* - a glyph hinter, T1_Hinter, used to record and apply the stem
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* hints
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*
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* - a charstrings interpreter, CID_Decoder, used to parse the
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* Type 1 charstrings stream, manage a stack and call the builder
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* and/or hinter depending on the opcodes.
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*
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* Ideally, a Type 2 glyph loader would only need to have its own
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* T2_Decoder object (assuming the hinter is able to manage all
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* kinds of hints).
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*
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******************************************************************/
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#ifndef CIDGLOAD_H
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#define CIDGLOAD_H
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#include <cidobjs.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*************************************************************************/
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/* */
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/* <Structure> CID_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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/* system :: current system object */
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/* face :: current face object */
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/* glyph :: current glyph slot */
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/* */
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/* current :: current glyph outline */
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/* base :: base glyph outline */
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/* */
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/* max_points :: maximum points in builder outline */
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/* max_contours :: maximum contours in builder outline */
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/* */
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/* last :: last point position */
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/* */
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/* scale_x :: horizontal scale ( FUnits to sub-pixels ) */
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/* scale_y :: vertical scale ( FUnits to sub-pixels ) */
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/* pos_x :: horizontal translation (composite glyphs) */
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/* pos_y :: vertical translation (composite glyph) */
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/* */
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/* left_bearing :: left side bearing point */
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/* advance :: horizontal advance vector */
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/* */
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/* path_begun :: flag, indicates that a new path has begun */
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/* load_points :: flag, if not set, no points are loaded */
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/* */
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/* error :: an error code that is only used to report */
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/* memory allocation problems.. */
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/* */
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/* metrics_only :: a boolean indicating that we only want to */
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/* compute the metrics of a given glyph, not load */
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/* all of its points.. */
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/* */
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typedef struct CID_Builder_
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{
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FT_Memory memory;
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CID_Face face;
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T1_GlyphSlot glyph;
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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_Int max_points; /* capacity of base outline in points */
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FT_Int max_contours; /* capacity of base outline in contours */
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T1_Vector last;
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T1_Fixed scale_x;
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T1_Fixed scale_y;
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T1_Pos pos_x;
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T1_Pos pos_y;
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T1_Vector left_bearing;
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T1_Vector advance;
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T1_BBox bbox; /* bounding box */
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T1_Bool path_begun;
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T1_Bool load_points;
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T1_Bool no_recurse;
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FT_Error error; /* only used for memory errors */
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T1_Bool metrics_only;
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} CID_Builder;
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/* execution context charstring zone */
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typedef struct CID_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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} CID_Decoder_Zone;
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typedef struct CID_Decoder_
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{
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CID_Builder builder;
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FT_Int stack[ T1_MAX_CHARSTRINGS_OPERANDS ];
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FT_Int* top;
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CID_Decoder_Zone zones[ T1_MAX_SUBRS_CALLS+1 ];
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CID_Decoder_Zone* zone;
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FT_Matrix font_matrix;
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CID_Subrs* subrs;
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FT_UInt lenIV;
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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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} CID_Decoder;
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LOCAL_DEF
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void CID_Init_Builder( CID_Builder* builder,
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CID_Face face,
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T1_Size size,
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T1_GlyphSlot glyph );
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LOCAL_DEF
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void CID_Done_Builder( CID_Builder* builder );
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LOCAL_DEF
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void CID_Init_Decoder( CID_Decoder* decoder );
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#if 0
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/* Compute the maximum advance width of a font through quick parsing */
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LOCAL_DEF
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FT_Error CID_Compute_Max_Advance( CID_Face face,
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FT_Int *max_advance );
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#endif
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/* This function is exported, because it is used by the T1Dump utility */
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LOCAL_DEF
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FT_Error CID_Parse_CharStrings( CID_Decoder* decoder,
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FT_Byte* charstring_base,
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FT_Int charstring_len );
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LOCAL_DEF
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FT_Error CID_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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