/**************************************************************************** * * ttobjs.h * * Objects manager (specification). * * Copyright (C) 1996-2023 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> FT_BEGIN_HEADER /************************************************************************** * * @Type: * TT_Driver * * @Description: * A handle to a TrueType driver object. */ TT_Driver; /************************************************************************** * * @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. */ TT_GlyphSlot; /************************************************************************** * * @Struct: * TT_GraphicsState * * @Description: * The TrueType graphics state used during bytecode interpretation. */ 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 … /************************************************************************** * * There can only be 3 active code ranges at once: * - the Font Program * - the CVT Program * - a glyph's instructions set */ TT_CodeRange_Tag; TT_CodeRange; TT_CodeRangeTable; /************************************************************************** * * Defines a function/instruction definition record. */ TT_DefArray; /************************************************************************** * * Subglyph transformation record. */ 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. */ TT_Size_Metrics; /************************************************************************** * * TrueType size class. */ TT_SizeRec; /************************************************************************** * * TrueType driver class. */ 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_height( FT_Size size ); 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 ) … FT_END_HEADER #endif /* TTOBJS_H_ */ /* END */
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