| /******************************************************************* |
| * |
| * 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_Bool no_recurse; |
| |
| 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 */ |
| LOCAL_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 ); |
| |
| |
| |
| 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 */ |