kc3-lang/freetype/src/type1z/t1gload.h
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Hash : 0dd34348
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Date : 2000-02-02T12:20:53
The Type 1 experimental driver was updated - small reduction of the code size of "t1encode.c" - removed the hinter (not useful with the upcoming auto-hinter..) - updated "t1load.c" to reduce warnings with Visual C++ - considerably changed the glyph loader (it is simpler) Beware, this code is still experimental, and is _not_ debugged. I don't even guarantee that it works for now - David
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src/type1z/t1gload.h
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/******************************************************************* * * 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, T1_Builder, used to store the built outline * * - a glyph hinter, T1_Hinter, used to record and apply the stem * hints * * - a charstrings interpreter, T1_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 <t1objs.h> #ifdef __cplusplus extern "C" { #endif /*************************************************************************/ /* */ /* <Structure> T1_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 T1_Builder_ { FT_Memory memory; T1_Face face; T1_GlyphSlot glyph; FT_Outline current; /* the current glyph outline */ FT_Outline base; /* the composite glyph outline */ T1_Int max_points; /* capacity of base outline in points */ T1_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_Error error; /* only used for memory errors */ T1_Bool metrics_only; } T1_Builder; /* execution context charstring zone */ typedef struct T1_Decoder_Zone_ { T1_Byte* base; T1_Byte* limit; T1_Byte* cursor; } T1_Decoder_Zone; typedef struct T1_Decoder_ { T1_Builder builder; T1_Int stack[ T1_MAX_CHARSTRINGS_OPERANDS ]; T1_Int* top; T1_Decoder_Zone zones[ T1_MAX_SUBRS_CALLS+1 ]; T1_Decoder_Zone* zone; T1_Int flex_state; T1_Int num_flex_vectors; T1_Vector flex_vectors[7]; } T1_Decoder; LOCAL_DEF void T1_Init_Builder( T1_Builder* builder, T1_Face face, T1_Size size, T1_GlyphSlot glyph ); LOCAL_DEF void T1_Done_Builder( T1_Builder* builder ); LOCAL_DEF void T1_Init_Decoder( T1_Decoder* decoder ); /* Compute the maximum advance width of a font through quick parsing */ LOCAL_DEF T1_Error T1_Compute_Max_Advance( T1_Face face, T1_Int *max_advance ); /* This function is exported, because it is used by the T1Dump utility */ EXPORT_DEF T1_Error T1_Parse_CharStrings( T1_Decoder* decoder, T1_Byte* charstring_base, T1_Int charstring_len, T1_Int num_subrs, T1_Byte** subrs_base, T1_Int* subrs_len ); /*************************************************************************/ /* */ /* <Function> T1_Add_Points */ /* */ /* <Description> */ /* Checks that there is enough room in the current load glyph outline */ /* to accept "num_points" additional outline points. If not, this */ /* function grows the load outline's arrays accordingly.. */ /* */ /* <Input> */ /* builder :: pointer to glyph builder object */ /* num_points :: number of points that will be added later */ /* */ /* <Return> */ /* Type1 error code. 0 means success */ /* */ /* <Note> */ /* This function does NOT update the points count in the glyph loader */ /* This must be done by the caller itself, after this function is */ /* invoked.. */ /* */ LOCAL_DEF T1_Error T1_Add_Points( T1_Builder* builder, T1_Int num_points ); /*************************************************************************/ /* */ /* <Function> T1_Add_Contours */ /* */ /* <Description> */ /* Checks that there is enough room in the current load glyph outline */ /* to accept "num_contours" additional contours. If not, this func */ /* the load outline's arrays accordingly.. */ /* */ /* <Input> */ /* builder :: pointer to glyph builder object */ /* num_contours :: number of contours that will be added later */ /* */ /* <Return> */ /* Type1 error code. 0 means success */ /* */ /* <Note> */ /* This function does NOT update the contours count in the load glyph */ /* This must be done by the caller itself, after this function is */ /* invoked.. */ /* */ LOCAL_DEF T1_Error T1_Add_Contours( T1_Builder* builder, T1_Int num_contours ); LOCAL_DEF T1_Error T1_Load_Glyph( T1_GlyphSlot glyph, T1_Size size, T1_Int glyph_index, T1_Int load_flags ); #ifdef __cplusplus } #endif #endif /* T1GLOAD_H */