ref: 768c9561f614b1da1b74b2649f19a8f863e3f892
dir: /src/type1z/z1gload.h/
/*******************************************************************
*
* t1gload.h 1.0
*
* 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, Z1_Builder, used to store the built outline
*
* - a glyph hinter, Z1_Hinter, used to record and apply the stem
* hints
*
* - a charstrings interpreter, Z1_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 T1GLOAD_H
#define T1GLOAD_H
#include <z1objs.h>
#ifdef __cplusplus
extern "C" {
#endif
/*************************************************************************/
/* */
/* <Structure> Z1_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 Z1_Builder_
{
FT_Memory memory;
T1_Face face;
Z1_GlyphSlot glyph;
FT_GlyphLoader* loader;
FT_Outline* current; /* the current glyph outline */
FT_Outline* base; /* the composite glyph outline */
FT_Vector last;
FT_Fixed scale_x;
FT_Fixed scale_y;
FT_Pos pos_x;
FT_Pos pos_y;
FT_Vector left_bearing;
FT_Vector advance;
FT_BBox bbox; /* bounding box */
FT_Bool path_begun;
FT_Bool load_points;
FT_Bool no_recurse;
FT_Error error; /* only used for memory errors */
FT_Bool metrics_only;
} Z1_Builder;
/* execution context charstring zone */
typedef struct Z1_Decoder_Zone_
{
FT_Byte* base;
FT_Byte* limit;
FT_Byte* cursor;
} Z1_Decoder_Zone;
typedef struct Z1_Decoder_
{
Z1_Builder builder;
FT_Int stack[ T1_MAX_CHARSTRINGS_OPERANDS ];
FT_Int* top;
Z1_Decoder_Zone zones[ T1_MAX_SUBRS_CALLS+1 ];
Z1_Decoder_Zone* zone;
FT_Int flex_state;
FT_Int num_flex_vectors;
FT_Vector flex_vectors[7];
T1_Blend* blend; /* for multiple masters */
} Z1_Decoder;
LOCAL_DEF
void Z1_Init_Builder( Z1_Builder* builder,
T1_Face face,
Z1_Size size,
Z1_GlyphSlot glyph );
LOCAL_DEF
void Z1_Done_Builder( Z1_Builder* builder );
LOCAL_DEF
void Z1_Init_Decoder( Z1_Decoder* decoder );
/* Compute the maximum advance width of a font through quick parsing */
LOCAL_DEF
FT_Error Z1_Compute_Max_Advance( T1_Face face,
FT_Int *max_advance );
/* This function is exported, because it is used by the T1Dump utility */
LOCAL_DEF
FT_Error Z1_Parse_CharStrings( Z1_Decoder* decoder,
FT_Byte* charstring_base,
FT_Int charstring_len,
FT_Int num_subrs,
FT_Byte** subrs_base,
FT_Int* subrs_len );
LOCAL_DEF
FT_Error Z1_Load_Glyph( Z1_GlyphSlot glyph,
Z1_Size size,
FT_Int glyph_index,
FT_Int load_flags );
#ifdef __cplusplus
}
#endif
#endif /* T1GLOAD_H */