kc3-lang/freetype/src/type1/t1gload.h
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Hash : f0df85ba
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Date : 2000-06-22T00:17:42
- MAJOR INTERNAL REDESIGN: A lot of internal modifications have been performed lately on the source in order to provide the following enhancements: - more generic module support: The FT_Module type is now defined to represent a handle to a given module. The file <freetype/ftmodule.h> contains the FT_Module_Class definition, as well as the module-loading public API The FT_Driver type is still defined, and still represents a pointer to a font driver. Note that FT_Add_Driver is replaced by FT_Add_Module, FT_Get_Driver by FT_Get_Module, etc.. - support for generic glyph image types: The FT_Renderer type is a pointer to a module used to perform various operations on glyph image. Each renderer is capable of handling images in a single format (e.g. ft_glyph_format_outline). Its functions are used to: - transform an glyph image - render a glyph image into a bitmap - return the control box (dimensions) of a given glyph image The scan converters "ftraster.c" and "ftgrays.c" have been moved to the new directory "src/renderer", and are used to provide two default renderer modules. One corresponds to the "standard" scan-converter, the other to the "smooth" one. The current renderer can be set through the new function FT_Set_Renderer. The old raster-related function FT_Set_Raster, FT_Get_Raster and FT_Set_Raster_Mode have now disappeared, in favor of the new: FT_Get_Renderer FT_Set_Renderer see the file <freetype/ftrender.h> for more details.. These changes were necessary to properly support different scalable formats in the future, like bi-color glyphs, etc.. - glyph loader object: A new internal object, called a 'glyph loader' has been introduced in the base layer. It is used by all scalable format font drivers to load glyphs and composites. This object has been created to reduce the code size of each driver, as each one of them basically re-implemented its functionality. See <freetype/internal/ftobjs.h> and the FT_GlyphLoader type for more information.. - FT_GlyphSlot had new fields: In order to support extended features (see below), the FT_GlyphSlot structure has a few new fields: linearHoriAdvance: this field gives the linearly scaled (i.e. scaled but unhinted) advance width for the glyph, expressed as a 16.16 fixed pixel value. This is useful to perform WYSIWYG text. linearVertAdvance: this field gives the linearly scaled advance height for the glyph (relevant in vertical glyph layouts only). This is useful to perform WYSIWYG text. Note that the two above field replace the removed "metrics2" field in the glyph slot. advance: this field is a vector that gives the transformed advance for the glyph. By default, it corresponds to the advance width, unless FT_LOAD_VERTICAL_LAYOUT was specified when calling FT_Load_Glyph or FT_Load_Char bitmap_left: this field gives the distance in integer pixels from the current pen position to the left-most pixel of a glyph image WHEN IT IS A BITMAP. It is only valid when the "format" field is set to "ft_glyph_format_bitmap", for example, after calling the new function FT_Render_Glyph. bitmap_top: this field gives the distance in integer pixels from the current pen position (located on the baseline) to the top-most pixel of the glyph image WHEN IT IS A BITMAP. Positive values correspond to upwards Y. loader: this is a new private field for the glyph slot. Client applications should not touch it.. - support for transforms and direct rendering in FT_Load_Glyph: Most of the functionality found in <freetype/ftglyph.h> has been moved to the core library. Hence, the following: - a transform can be specified for a face through FT_Set_Transform. this transform is applied by FT_Load_Glyph to scalable glyph images (i.e. NOT TO BITMAPS) before the function returns, unless the bit flag FT_LOAD_IGNORE_TRANSFORM was set in the load flags.. - once a glyph image has been loaded, it can be directly converted to a bitmap by using the new FT_Render_Glyph function. Note that this function takes the glyph image from the glyph slot, and converts it to a bitmap whose properties are returned in "face.glyph.bitmap", "face.glyph.bitmap_left" and "face.glyph.bitmap_top". The original native image might be lost after the conversion. - when using the new bit flag FT_LOAD_RENDER, the FT_Load_Glyph and FT_Load_Char functions will call FT_Render_Glyph automatically when needed.
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src/type1/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_Funcs */ /* */ /* <Description> */ /* a structure used to store the address of various functions */ /* used by a glyph builder to implement the outline's "path */ /* construction". */ /* */ /* */ typedef struct T1_Builder_ T1_Builder; typedef FT_Error (*T1_Builder_EndChar)( T1_Builder* loader ); typedef FT_Error (*T1_Builder_Sbw) ( T1_Builder* loader, FT_Pos sbx, FT_Pos sby, FT_Pos wx, FT_Pos wy ); typedef FT_Error (*T1_Builder_ClosePath)( T1_Builder* loader ); typedef FT_Error (*T1_Builder_RLineTo)( T1_Builder* loader, FT_Pos dx, FT_Pos dy ); typedef FT_Error (*T1_Builder_RMoveTo)( T1_Builder* loader, FT_Pos dx, FT_Pos dy ); typedef FT_Error (*T1_Builder_RCurveTo)( T1_Builder* loader, FT_Pos dx1, FT_Pos dy1, FT_Pos dx2, FT_Pos dy2, FT_Pos dx3, FT_Pos dy3 ); typedef struct T1_Builder_Funcs_ { T1_Builder_EndChar end_char; T1_Builder_Sbw set_bearing_point; T1_Builder_ClosePath close_path; T1_Builder_RLineTo rline_to; T1_Builder_RMoveTo rmove_to; T1_Builder_RCurveTo rcurve_to; } T1_Builder_Funcs; /*************************************************************************/ /* */ /* <Structure> T1_Builder */ /* */ /* <Description> */ /* a structure used during glyph loading to store its outline. */ /* */ /* <Fields> */ /* system :: current system object */ /* face :: current face object */ /* size :: current size 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 */ /* */ /* pass :: pass number for multi-pass hinters */ /* */ /* funcs :: table of builder functions used to perform */ /* the outline's path construction */ /* */ /* hint_point :: index of next point to hint.. */ /* */ /* */ /* */ /* */ struct T1_Builder_ { FT_Memory memory; T1_Face face; T1_Size size; T1_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_Bool no_recurse; FT_BBox bbox; /* bounding box */ FT_Bool path_begun; FT_Bool load_points; FT_Int pass; FT_Int hint_point; /* path construction function interface */ T1_Builder_Funcs funcs; }; /*************************************************************************/ /* */ /* <Structure> T1_Hinter_Funcs */ /* */ /* <Description> */ /* a structure used to store the address of various functions */ /* used by a Type 1 hinter to perform outline hinting. */ /* */ typedef FT_Error (*T1_Hinter_ChangeHints)( T1_Builder* builder ); typedef FT_Error (*T1_Hinter_DotSection)( T1_Builder* builder ); typedef FT_Error (*T1_Hinter_Stem)( T1_Builder* builder, FT_Pos pos, FT_Pos width, FT_Bool vertical ); typedef FT_Error (*T1_Hinter_Stem3)( T1_Builder* builder, FT_Pos pos0, FT_Pos width0, FT_Pos pos1, FT_Pos width1, FT_Pos pos2, FT_Pos width2, FT_Bool vertical ); typedef struct T1_Hinter_Func_ { T1_Hinter_ChangeHints change_hints; T1_Hinter_DotSection dot_section; T1_Hinter_Stem stem; T1_Hinter_Stem3 stem3; } T1_Hinter_Funcs; typedef enum T1_Operator_ { op_none = 0, op_endchar, op_hsbw, op_seac, op_sbw, op_closepath, op_hlineto, op_hmoveto, op_hvcurveto, op_rlineto, op_rmoveto, op_rrcurveto, op_vhcurveto, op_vlineto, op_vmoveto, op_dotsection, op_hstem, op_hstem3, op_vstem, op_vstem3, op_div, op_callothersubr, op_callsubr, op_pop, op_return, op_setcurrentpoint, op_max /* never remove this one */ } T1_Operator; /* execution context charstring zone */ typedef struct T1_Decoder_Zone_ { FT_Byte* base; FT_Byte* limit; FT_Byte* cursor; } T1_Decoder_Zone; typedef struct T1_Decoder_ { T1_Builder builder; T1_Hinter_Funcs hinter; FT_Int stack[ T1_MAX_CHARSTRINGS_OPERANDS ]; FT_Int* top; T1_Decoder_Zone zones[ T1_MAX_SUBRS_CALLS+1 ]; T1_Decoder_Zone* zone; FT_Int flex_state; FT_Int num_flex_vectors; FT_Vector flex_vectors[7]; } T1_Decoder; /********************************************************************* * * <Function> * T1_Init_Builder * * <Description> * Initialise a given glyph builder. * * <Input> * builder :: glyph builder to initialise * face :: current face object * size :: current size object * glyph :: current glyph object * funcs :: glyph builder functions (or "methods"). * * <Note> * This function is exported for now because it is used by the * "t1dump" utility. Later, it will be accessed through a * format-specific extension * *********************************************************************/ LOCAL_DEF void T1_Init_Builder( T1_Builder* builder, T1_Face face, T1_Size size, T1_GlyphSlot glyph, const T1_Builder_Funcs* funcs ); /********************************************************************* * * <Function> * T1_Done_Builder * * <Description> * Finalise a given glyph builder. Its content can still be * used after the call, but the function saves important information * within the corresponding glyph slot. * * <Input> * builder :: glyph builder to initialise * * <Note> * This function is exported for now because it is used by the * "t1dump" utility. Later, it will be accessed through a * format-specific extension * *********************************************************************/ LOCAL_DEF void T1_Done_Builder( T1_Builder* builder ); /********************************************************************* * * <Function> * T1_Init_Decoder * * <Description> * Initialise a given Type 1 decoder for parsing * * <Input> * decoder :: Type 1 decoder to initialise * funcs :: hinter functions interface * * <Note> * This function is exported for now because it is used by the * "t1dump" utility. Later, it will be accessed through a * format-specific extension * *********************************************************************/ LOCAL_DEF void T1_Init_Decoder( T1_Decoder* decoder, const T1_Hinter_Funcs* funcs ); /* Compute the maximum advance width of a font through quick parsing */ LOCAL_DEF FT_Error T1_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 T1_Parse_CharStrings( T1_Decoder* decoder, FT_Byte* charstring_base, FT_Int charstring_len, FT_Int num_subrs, FT_Byte** subrs_base, FT_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 FT_Error T1_Add_Points( T1_Builder* builder, FT_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 FT_Error T1_Add_Contours( T1_Builder* builder, FT_Int num_contours ); LOCAL_DEF FT_Error T1_Load_Glyph( T1_GlyphSlot glyph, T1_Size size, FT_Int glyph_index, FT_Int load_flags ); #ifdef __cplusplus } #endif #endif /* T1GLOAD_H */