| /***************************************************************************/ |
| /* */ |
| /* ttobjs.h */ |
| /* */ |
| /* Objects manager (specification). */ |
| /* */ |
| /* Copyright 1996-2015 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 <ft2build.h> |
| #include FT_INTERNAL_OBJECTS_H |
| #include FT_INTERNAL_TRUETYPE_TYPES_H |
| |
| |
| FT_BEGIN_HEADER |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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; |
| |
| #ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING |
| FT_Bool both_x_axis; |
| #endif |
| |
| 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_UShort delta_base; |
| FT_UShort delta_shift; |
| |
| FT_Byte instruct_control; |
| /* According to Greg Hitchcock from Microsoft, the `scan_control' */ |
| /* variable as documented in the TrueType specification is a 32-bit */ |
| /* integer; the high-word part holds the SCANTYPE value, the low-word */ |
| /* part the SCANCTRL value. We separate it into two fields. */ |
| FT_Bool scan_control; |
| FT_Int scan_type; |
| |
| FT_UShort gep0; |
| FT_UShort gep1; |
| FT_UShort gep2; |
| |
| } TT_GraphicsState; |
| |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| FT_LOCAL( void ) |
| tt_glyphzone_done( TT_GlyphZone zone ); |
| |
| FT_LOCAL( FT_Error ) |
| tt_glyphzone_new( FT_Memory memory, |
| FT_UShort maxPoints, |
| FT_Short maxContours, |
| TT_GlyphZone zone ); |
| |
| #endif /* TT_USE_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_Long 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_Long end; /* where does it end? */ |
| FT_UInt opc; /* function #, or instruction code */ |
| FT_Bool active; /* is it active? */ |
| FT_Bool inline_delta; /* is function that defines inline delta? */ |
| FT_ULong sph_fdef_flags; /* flags to identify special functions */ |
| |
| } 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; |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* 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 TT_Size_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; |
| |
| /* we have our own copy of metrics so that we can modify */ |
| /* it without affecting auto-hinting (when used) */ |
| FT_Size_Metrics metrics; |
| |
| TT_Size_Metrics ttmetrics; |
| |
| FT_ULong strike_index; /* 0xFFFFFFFF to indicate invalid */ |
| |
| #ifdef TT_USE_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_GlyphZoneRec twilight; /* The instance's twilight zone */ |
| |
| TT_ExecContext context; |
| |
| /* if negative, `fpgm' (resp. `prep'), wasn't executed yet; */ |
| /* otherwise it is the returned error code */ |
| FT_Error bytecode_ready; |
| FT_Error cvt_ready; |
| |
| #endif /* TT_USE_BYTECODE_INTERPRETER */ |
| |
| } TT_SizeRec; |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* TrueType driver class. */ |
| /* */ |
| typedef struct TT_DriverRec_ |
| { |
| FT_DriverRec root; |
| |
| TT_GlyphZoneRec zone; /* glyph loader points zone */ |
| |
| FT_UInt interpreter_version; |
| |
| } TT_DriverRec; |
| |
| |
| /* Note: All of the functions below (except tt_size_reset()) are used */ |
| /* as function pointers in a FT_Driver_ClassRec. Therefore their */ |
| /* parameters are of types FT_Face, FT_Size, etc., rather than TT_Face, */ |
| /* TT_Size, etc., so that the compiler can confirm that the types and */ |
| /* number of parameters are correct. In all cases the FT_xxx types are */ |
| /* cast to their TT_xxx counterparts inside the functions since FreeType */ |
| /* will always use the TT driver to create them. */ |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Face functions */ |
| /* */ |
| FT_LOCAL( FT_Error ) |
| tt_face_init( FT_Stream stream, |
| FT_Face ttface, /* TT_Face */ |
| FT_Int face_index, |
| FT_Int num_params, |
| FT_Parameter* params ); |
| |
| FT_LOCAL( void ) |
| tt_face_done( FT_Face ttface ); /* TT_Face */ |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Size functions */ |
| /* */ |
| FT_LOCAL( FT_Error ) |
| tt_size_init( FT_Size ttsize ); /* TT_Size */ |
| |
| FT_LOCAL( void ) |
| tt_size_done( FT_Size ttsize ); /* TT_Size */ |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| FT_LOCAL( FT_Error ) |
| tt_size_run_fpgm( TT_Size size, |
| FT_Bool pedantic ); |
| |
| FT_LOCAL( FT_Error ) |
| tt_size_run_prep( TT_Size size, |
| FT_Bool pedantic ); |
| |
| FT_LOCAL( FT_Error ) |
| tt_size_ready_bytecode( TT_Size size, |
| FT_Bool pedantic ); |
| |
| #endif /* TT_USE_BYTECODE_INTERPRETER */ |
| |
| FT_LOCAL( FT_Error ) |
| tt_size_reset( TT_Size size ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Driver functions */ |
| /* */ |
| FT_LOCAL( FT_Error ) |
| tt_driver_init( FT_Module ttdriver ); /* TT_Driver */ |
| |
| FT_LOCAL( void ) |
| tt_driver_done( FT_Module ttdriver ); /* TT_Driver */ |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Slot functions */ |
| /* */ |
| FT_LOCAL( FT_Error ) |
| tt_slot_init( FT_GlyphSlot slot ); |
| |
| |
| /* auxiliary */ |
| #define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 ) |
| |
| |
| FT_END_HEADER |
| |
| #endif /* __TTOBJS_H__ */ |
| |
| |
| /* END */ |
