189 lines
6.8 KiB
C
189 lines
6.8 KiB
C
/*******************************************************************
|
|
*
|
|
* cidgload.h 1.0
|
|
*
|
|
* CID-Keyed Type1 Glyph Loader.
|
|
*
|
|
* Copyright 1996-1998 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.
|
|
*
|
|
*
|
|
* The Type 1 glyph loader uses three distinct objects to build
|
|
* scaled and hinted outlines from a charstrings program. These are :
|
|
*
|
|
* - a glyph builder, CID_Builder, used to store the built outline
|
|
*
|
|
* - a glyph hinter, T1_Hinter, used to record and apply the stem
|
|
* hints
|
|
*
|
|
* - a charstrings interpreter, CID_Decoder, used to parse the
|
|
* Type 1 charstrings stream, manage a stack and call the builder
|
|
* and/or hinter depending on the opcodes.
|
|
*
|
|
* Ideally, a Type 2 glyph loader would only need to have its own
|
|
* T2_Decoder object (assuming the hinter is able to manage all
|
|
* kinds of hints).
|
|
*
|
|
******************************************************************/
|
|
|
|
#ifndef CIDGLOAD_H
|
|
#define CIDGLOAD_H
|
|
|
|
#include <cidobjs.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Structure> CID_Builder */
|
|
/* */
|
|
/* <Description> */
|
|
/* a structure used during glyph loading to store its outline. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* system :: current system object */
|
|
/* face :: current face object */
|
|
/* glyph :: current glyph slot */
|
|
/* */
|
|
/* current :: current glyph outline */
|
|
/* base :: base glyph outline */
|
|
/* */
|
|
/* max_points :: maximum points in builder outline */
|
|
/* max_contours :: maximum contours in builder outline */
|
|
/* */
|
|
/* last :: last point position */
|
|
/* */
|
|
/* scale_x :: horizontal scale ( FUnits to sub-pixels ) */
|
|
/* scale_y :: vertical scale ( FUnits to sub-pixels ) */
|
|
/* pos_x :: horizontal translation (composite glyphs) */
|
|
/* pos_y :: vertical translation (composite glyph) */
|
|
/* */
|
|
/* left_bearing :: left side bearing point */
|
|
/* advance :: horizontal advance vector */
|
|
/* */
|
|
/* path_begun :: flag, indicates that a new path has begun */
|
|
/* load_points :: flag, if not set, no points are loaded */
|
|
/* */
|
|
/* error :: an error code that is only used to report */
|
|
/* memory allocation problems.. */
|
|
/* */
|
|
/* metrics_only :: a boolean indicating that we only want to */
|
|
/* compute the metrics of a given glyph, not load */
|
|
/* all of its points.. */
|
|
/* */
|
|
|
|
typedef struct CID_Builder_
|
|
{
|
|
FT_Memory memory;
|
|
CID_Face face;
|
|
T1_GlyphSlot glyph;
|
|
|
|
FT_Outline current; /* the current glyph outline */
|
|
FT_Outline base; /* the composite glyph outline */
|
|
|
|
FT_Int max_points; /* capacity of base outline in points */
|
|
FT_Int max_contours; /* capacity of base outline in contours */
|
|
|
|
T1_Vector last;
|
|
|
|
T1_Fixed scale_x;
|
|
T1_Fixed scale_y;
|
|
|
|
T1_Pos pos_x;
|
|
T1_Pos pos_y;
|
|
|
|
T1_Vector left_bearing;
|
|
T1_Vector advance;
|
|
|
|
T1_BBox bbox; /* bounding box */
|
|
T1_Bool path_begun;
|
|
T1_Bool load_points;
|
|
T1_Bool no_recurse;
|
|
|
|
FT_Error error; /* only used for memory errors */
|
|
T1_Bool metrics_only;
|
|
|
|
} CID_Builder;
|
|
|
|
|
|
/* execution context charstring zone */
|
|
typedef struct CID_Decoder_Zone_
|
|
{
|
|
FT_Byte* base;
|
|
FT_Byte* limit;
|
|
FT_Byte* cursor;
|
|
|
|
} CID_Decoder_Zone;
|
|
|
|
|
|
typedef struct CID_Decoder_
|
|
{
|
|
CID_Builder builder;
|
|
|
|
FT_Int stack[ T1_MAX_CHARSTRINGS_OPERANDS ];
|
|
FT_Int* top;
|
|
|
|
CID_Decoder_Zone zones[ T1_MAX_SUBRS_CALLS+1 ];
|
|
CID_Decoder_Zone* zone;
|
|
|
|
FT_Matrix font_matrix;
|
|
CID_Subrs* subrs;
|
|
FT_UInt lenIV;
|
|
|
|
FT_Int flex_state;
|
|
FT_Int num_flex_vectors;
|
|
FT_Vector flex_vectors[7];
|
|
|
|
} CID_Decoder;
|
|
|
|
|
|
|
|
LOCAL_DEF
|
|
void CID_Init_Builder( CID_Builder* builder,
|
|
CID_Face face,
|
|
T1_Size size,
|
|
T1_GlyphSlot glyph );
|
|
|
|
LOCAL_DEF
|
|
void CID_Done_Builder( CID_Builder* builder );
|
|
|
|
|
|
LOCAL_DEF
|
|
void CID_Init_Decoder( CID_Decoder* decoder );
|
|
|
|
|
|
#if 0
|
|
/* Compute the maximum advance width of a font through quick parsing */
|
|
LOCAL_DEF
|
|
FT_Error CID_Compute_Max_Advance( CID_Face face,
|
|
FT_Int *max_advance );
|
|
#endif
|
|
|
|
/* This function is exported, because it is used by the T1Dump utility */
|
|
LOCAL_DEF
|
|
FT_Error CID_Parse_CharStrings( CID_Decoder* decoder,
|
|
FT_Byte* charstring_base,
|
|
FT_Int charstring_len );
|
|
|
|
LOCAL_DEF
|
|
FT_Error CID_Load_Glyph( T1_GlyphSlot glyph,
|
|
T1_Size size,
|
|
FT_Int glyph_index,
|
|
FT_Int load_flags );
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* T1GLOAD_H */
|