kc3-lang/freetype/src/truetype/ttobjs.h
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Hash : 4b68007b
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Date : 2000-11-07T06:30:29
Complementing David's changes with formatting, adding documentation, etc. More `*'-convention formatting, adding the `a' resp. `an' prefix to variables.
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src/truetype/ttobjs.h
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/***************************************************************************/ /* */ /* ttobjs.h */ /* */ /* Objects manager (specification). */ /* */ /* Copyright 1996-2000 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. */ /* */ /***************************************************************************/ #ifndef TTOBJS_H #define TTOBJS_H #include <freetype/internal/ftobjs.h> #include <freetype/internal/tttypes.h> #include <freetype/internal/tterrors.h> #ifdef __cplusplus extern "C" { #endif /*************************************************************************/ /* */ /* <Type> */ /* TT_Driver */ /* */ /* <Description> */ /* A handle to a TrueType driver object. */ /* */ typedef struct TT_DriverRec_* TT_Driver; /*************************************************************************/ /* */ /* <Type> */ /* TT_Instance */ /* */ /* <Description> */ /* A handle to a TrueType size object. */ /* */ typedef struct TT_SizeRec_* TT_Size; /*************************************************************************/ /* */ /* <Type> */ /* TT_GlyphSlot */ /* */ /* <Description> */ /* A handle to a TrueType glyph slot object. */ /* */ /* <Note> */ /* This is a direct typedef of FT_GlyphSlot, as there is nothing */ /* specific about the TrueType glyph slot. */ /* */ typedef FT_GlyphSlot TT_GlyphSlot; /*************************************************************************/ /* */ /* <Struct> */ /* TT_GraphicsState */ /* */ /* <Description> */ /* The TrueType graphics state used during bytecode interpretation. */ /* */ typedef struct TT_GraphicsState_ { FT_UShort rp0; FT_UShort rp1; FT_UShort rp2; FT_UnitVector dualVector; FT_UnitVector projVector; FT_UnitVector freeVector; FT_Long loop; FT_F26Dot6 minimum_distance; FT_Int round_state; FT_Bool auto_flip; FT_F26Dot6 control_value_cutin; FT_F26Dot6 single_width_cutin; FT_F26Dot6 single_width_value; FT_Short delta_base; FT_Short delta_shift; FT_Byte instruct_control; FT_Bool scan_control; FT_Int scan_type; FT_UShort gep0; FT_UShort gep1; FT_UShort gep2; } TT_GraphicsState; #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER FT_LOCAL void TT_Done_GlyphZone( TT_GlyphZone* zone ); FT_LOCAL FT_Error TT_New_GlyphZone( FT_Memory memory, FT_UShort maxPoints, FT_Short maxContours, TT_GlyphZone* zone ); #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ /*************************************************************************/ /* */ /* EXECUTION SUBTABLES */ /* */ /* These sub-tables relate to instruction execution. */ /* */ /*************************************************************************/ #define TT_MAX_CODE_RANGES 3 /*************************************************************************/ /* */ /* There can only be 3 active code ranges at once: */ /* - the Font Program */ /* - the CVT Program */ /* - a glyph's instructions set */ /* */ typedef enum TT_CodeRange_Tag_ { tt_coderange_none = 0, tt_coderange_font, tt_coderange_cvt, tt_coderange_glyph } TT_CodeRange_Tag; typedef struct TT_CodeRange_ { FT_Byte* base; FT_ULong size; } TT_CodeRange; typedef TT_CodeRange TT_CodeRangeTable[TT_MAX_CODE_RANGES]; /*************************************************************************/ /* */ /* Defines a function/instruction definition record. */ /* */ typedef struct TT_DefRecord_ { FT_Int range; /* in which code range is it located? */ FT_Long start; /* where does it start? */ FT_UInt opc; /* function #, or instruction code */ FT_Bool active; /* is it active? */ } TT_DefRecord, *TT_DefArray; /*************************************************************************/ /* */ /* Subglyph transformation record. */ /* */ typedef struct TT_Transform_ { FT_Fixed xx, xy; /* transformation matrix coefficients */ FT_Fixed yx, yy; FT_F26Dot6 ox, oy; /* offsets */ } TT_Transform; /*************************************************************************/ /* */ /* Subglyph loading record. Used to load composite components. */ /* */ typedef struct TT_SubglyphRec_ { FT_Long index; /* subglyph index; initialized with -1 */ FT_Bool is_scaled; /* is the subglyph scaled? */ FT_Bool is_hinted; /* should it be hinted? */ FT_Bool preserve_pps; /* preserve phantom points? */ FT_Long file_offset; FT_BBox bbox; FT_Pos left_bearing; FT_Pos advance; TT_GlyphZone zone; FT_Long arg1; /* first argument */ FT_Long arg2; /* second argument */ FT_UShort element_flag; /* current load element flag */ TT_Transform transform; /* transformation matrix */ FT_Vector pp1, pp2; /* phantom points */ } TT_SubGlyphRec, *TT_SubGlyph_Stack; /*************************************************************************/ /* */ /* A note regarding non-squared pixels: */ /* */ /* (This text will probably go into some docs at some time; for now, it */ /* is kept here to explain some definitions in the TIns_Metrics */ /* record). */ /* */ /* The CVT is a one-dimensional array containing values that control */ /* certain important characteristics in a font, like the height of all */ /* capitals, all lowercase letter, default spacing or stem width/height. */ /* */ /* These values are found in FUnits in the font file, and must be scaled */ /* to pixel coordinates before being used by the CVT and glyph programs. */ /* Unfortunately, when using distinct x and y resolutions (or distinct x */ /* and y pointsizes), there are two possible scalings. */ /* */ /* A first try was to implement a `lazy' scheme where all values were */ /* scaled when first used. However, while some values are always used */ /* in the same direction, some others are used under many different */ /* circumstances and orientations. */ /* */ /* I have found a simpler way to do the same, and it even seems to work */ /* in most of the cases: */ /* */ /* - All CVT values are scaled to the maximum ppem size. */ /* */ /* - When performing a read or write in the CVT, a ratio factor is used */ /* to perform adequate scaling. Example: */ /* */ /* x_ppem = 14 */ /* y_ppem = 10 */ /* */ /* We choose ppem = x_ppem = 14 as the CVT scaling size. All cvt */ /* entries are scaled to it. */ /* */ /* x_ratio = 1.0 */ /* y_ratio = y_ppem/ppem (< 1.0) */ /* */ /* We compute the current ratio like: */ /* */ /* - If projVector is horizontal, */ /* ratio = x_ratio = 1.0 */ /* */ /* - if projVector is vertical, */ /* ratio = y_ratio */ /* */ /* - else, */ /* ratio = sqrt( (proj.x * x_ratio) ^ 2 + (proj.y * y_ratio) ^ 2 ) */ /* */ /* Reading a cvt value returns */ /* ratio * cvt[index] */ /* */ /* Writing a cvt value in pixels: */ /* cvt[index] / ratio */ /* */ /* The current ppem is simply */ /* ratio * ppem */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* Metrics used by the TrueType size and context objects. */ /* */ typedef struct TT_Size_Metrics_ { /* for non-square pixels */ FT_Long x_ratio; FT_Long y_ratio; FT_UShort ppem; /* maximum ppem size */ FT_Long ratio; /* current ratio */ FT_Fixed scale; FT_F26Dot6 compensations[4]; /* device-specific compensations */ FT_Bool valid; FT_Bool rotated; /* `is the glyph rotated?'-flag */ FT_Bool stretched; /* `is the glyph stretched?'-flag */ } TT_Size_Metrics; /*************************************************************************/ /* */ /* TrueType size class. */ /* */ typedef struct TT_SizeRec_ { FT_SizeRec root; TT_Size_Metrics ttmetrics; #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS FT_UInt strike_index; /* 0xFFFF to indicate invalid */ FT_Size_Metrics strike_metrics; /* current strike's metrics */ #endif #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER FT_UInt num_function_defs; /* number of function definitions */ FT_UInt max_function_defs; TT_DefArray function_defs; /* table of function definitions */ FT_UInt num_instruction_defs; /* number of ins. definitions */ FT_UInt max_instruction_defs; TT_DefArray instruction_defs; /* table of ins. definitions */ FT_UInt max_func; FT_UInt max_ins; TT_CodeRangeTable codeRangeTable; TT_GraphicsState GS; FT_ULong cvt_size; /* the scaled control value table */ FT_Long* cvt; FT_UShort storage_size; /* The storage area is now part of */ FT_Long* storage; /* the instance */ TT_GlyphZone twilight; /* The instance's twilight zone */ /* debugging variables */ /* When using the debugger, we must keep the */ /* execution context tied to the instance */ /* object rather than asking it on demand. */ FT_Bool debug; TT_ExecContext context; #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ } TT_SizeRec; /*************************************************************************/ /* */ /* TrueType driver class. */ /* */ typedef struct TT_DriverRec_ { FT_DriverRec root; TT_ExecContext context; /* execution context */ TT_GlyphZone zone; /* glyph loader points zone */ void* extension_component; } TT_DriverRec; /*************************************************************************/ /* */ /* Face functions */ /* */ FT_LOCAL FT_Error TT_Init_Face( FT_Stream stream, TT_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ); FT_LOCAL void TT_Done_Face( TT_Face face ); /*************************************************************************/ /* */ /* Size functions */ /* */ FT_LOCAL FT_Error TT_Init_Size( TT_Size size ); FT_LOCAL void TT_Done_Size( TT_Size size ); FT_LOCAL FT_Error TT_Reset_Size( TT_Size size ); /*************************************************************************/ /* */ /* Driver functions */ /* */ FT_LOCAL FT_Error TT_Init_Driver( TT_Driver driver ); FT_LOCAL void TT_Done_Driver( TT_Driver driver ); #ifdef __cplusplus } #endif #endif /* TTOBJS_H */ /* END */