misc/libfreetype/src/truetype/ttobjs.h
author sheepluva
Thu, 03 May 2012 14:21:53 +0200
changeset 7017 19a434fc91fc
parent 5172 88f2e05288ba
permissions -rw-r--r--
visually indicate when map preview generation is in progress.
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/***************************************************************************/
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/*                                                                         */
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/*  ttobjs.h                                                               */
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/*                                                                         */
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/*    Objects manager (specification).                                     */
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/*                                                                         */
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/*  Copyright 1996-2009, 2011 by                                           */
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/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
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/*                                                                         */
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/*  This file is part of the FreeType project, and may only be used,       */
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/*  modified, and distributed under the terms of the FreeType project      */
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/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
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/*  this file you indicate that you have read the license and              */
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/*  understand and accept it fully.                                        */
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/*                                                                         */
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/***************************************************************************/
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#ifndef __TTOBJS_H__
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#define __TTOBJS_H__
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#include <ft2build.h>
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#include FT_INTERNAL_OBJECTS_H
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#include FT_INTERNAL_TRUETYPE_TYPES_H
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FT_BEGIN_HEADER
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  /*************************************************************************/
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  /*                                                                       */
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  /* <Type>                                                                */
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  /*    TT_Driver                                                          */
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  /*                                                                       */
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  /* <Description>                                                         */
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  /*    A handle to a TrueType driver object.                              */
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  /*                                                                       */
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  typedef struct TT_DriverRec_*  TT_Driver;
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  /*************************************************************************/
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  /*                                                                       */
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  /* <Type>                                                                */
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  /*    TT_Instance                                                        */
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  /*                                                                       */
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  /* <Description>                                                         */
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  /*    A handle to a TrueType size object.                                */
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  /*                                                                       */
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  typedef struct TT_SizeRec_*  TT_Size;
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  /*************************************************************************/
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  /*                                                                       */
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  /* <Type>                                                                */
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  /*    TT_GlyphSlot                                                       */
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  /*                                                                       */
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  /* <Description>                                                         */
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  /*    A handle to a TrueType glyph slot object.                          */
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  /*                                                                       */
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  /* <Note>                                                                */
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  /*    This is a direct typedef of FT_GlyphSlot, as there is nothing      */
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  /*    specific about the TrueType glyph slot.                            */
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  /*                                                                       */
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  typedef FT_GlyphSlot  TT_GlyphSlot;
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  /*************************************************************************/
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  /*                                                                       */
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  /* <Struct>                                                              */
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  /*    TT_GraphicsState                                                   */
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  /*                                                                       */
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  /* <Description>                                                         */
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  /*    The TrueType graphics state used during bytecode interpretation.   */
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  /*                                                                       */
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  typedef struct  TT_GraphicsState_
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  {
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    FT_UShort      rp0;
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    FT_UShort      rp1;
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    FT_UShort      rp2;
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    FT_UnitVector  dualVector;
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    FT_UnitVector  projVector;
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    FT_UnitVector  freeVector;
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#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
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    FT_Bool        both_x_axis;
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#endif
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    FT_Long        loop;
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    FT_F26Dot6     minimum_distance;
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    FT_Int         round_state;
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    FT_Bool        auto_flip;
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    FT_F26Dot6     control_value_cutin;
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    FT_F26Dot6     single_width_cutin;
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    FT_F26Dot6     single_width_value;
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    FT_Short       delta_base;
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    FT_Short       delta_shift;
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    FT_Byte        instruct_control;
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    /* According to Greg Hitchcock from Microsoft, the `scan_control'     */
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    /* variable as documented in the TrueType specification is a 32-bit   */
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    /* integer; the high-word part holds the SCANTYPE value, the low-word */
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    /* part the SCANCTRL value.  We separate it into two fields.          */
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    FT_Bool        scan_control;
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    FT_Int         scan_type;
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    FT_UShort      gep0;
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    FT_UShort      gep1;
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    FT_UShort      gep2;
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  } TT_GraphicsState;
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#ifdef TT_USE_BYTECODE_INTERPRETER
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  FT_LOCAL( void )
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  tt_glyphzone_done( TT_GlyphZone  zone );
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  FT_LOCAL( FT_Error )
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  tt_glyphzone_new( FT_Memory     memory,
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                    FT_UShort     maxPoints,
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                    FT_Short      maxContours,
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                    TT_GlyphZone  zone );
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#endif /* TT_USE_BYTECODE_INTERPRETER */
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  /*************************************************************************/
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  /*                                                                       */
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  /*  EXECUTION SUBTABLES                                                  */
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  /*                                                                       */
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  /*  These sub-tables relate to instruction execution.                    */
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  /*                                                                       */
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  /*************************************************************************/
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#define TT_MAX_CODE_RANGES  3
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  /*************************************************************************/
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  /*                                                                       */
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  /* There can only be 3 active code ranges at once:                       */
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  /*   - the Font Program                                                  */
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  /*   - the CVT Program                                                   */
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  /*   - a glyph's instructions set                                        */
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  /*                                                                       */
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  typedef enum  TT_CodeRange_Tag_
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  {
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    tt_coderange_none = 0,
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    tt_coderange_font,
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    tt_coderange_cvt,
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    tt_coderange_glyph
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  } TT_CodeRange_Tag;
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  typedef struct  TT_CodeRange_
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  {
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    FT_Byte*  base;
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    FT_ULong  size;
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  } TT_CodeRange;
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  typedef TT_CodeRange  TT_CodeRangeTable[TT_MAX_CODE_RANGES];
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  /*************************************************************************/
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  /*                                                                       */
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  /* Defines a function/instruction definition record.                     */
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  /*                                                                       */
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  typedef struct  TT_DefRecord_
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  {
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    FT_Int   range;      /* in which code range is it located? */
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    FT_Long  start;      /* where does it start?               */
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    FT_UInt  opc;        /* function #, or instruction code    */
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    FT_Bool  active;     /* is it active?                      */
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  } TT_DefRecord, *TT_DefArray;
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  /*************************************************************************/
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  /*                                                                       */
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  /* Subglyph transformation record.                                       */
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  /*                                                                       */
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  typedef struct  TT_Transform_
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  {
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    FT_Fixed    xx, xy;     /* transformation matrix coefficients */
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    FT_Fixed    yx, yy;
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    FT_F26Dot6  ox, oy;     /* offsets        */
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  } TT_Transform;
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  /*************************************************************************/
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  /*                                                                       */
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  /* A note regarding non-squared pixels:                                  */
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  /*                                                                       */
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  /* (This text will probably go into some docs at some time; for now, it  */
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  /* is kept here to explain some definitions in the TT_Size_Metrics       */
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  /* record).                                                              */
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  /*                                                                       */
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  /* The CVT is a one-dimensional array containing values that control     */
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  /* certain important characteristics in a font, like the height of all   */
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  /* capitals, all lowercase letter, default spacing or stem width/height. */
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  /*                                                                       */
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  /* These values are found in FUnits in the font file, and must be scaled */
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  /* to pixel coordinates before being used by the CVT and glyph programs. */
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  /* Unfortunately, when using distinct x and y resolutions (or distinct x */
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  /* and y pointsizes), there are two possible scalings.                   */
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  /*                                                                       */
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  /* A first try was to implement a `lazy' scheme where all values were    */
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  /* scaled when first used.  However, while some values are always used   */
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  /* in the same direction, some others are used under many different      */
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  /* circumstances and orientations.                                       */
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  /*                                                                       */
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  /* I have found a simpler way to do the same, and it even seems to work  */
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  /* in most of the cases:                                                 */
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  /*                                                                       */
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  /* - All CVT values are scaled to the maximum ppem size.                 */
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  /*                                                                       */
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  /* - When performing a read or write in the CVT, a ratio factor is used  */
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  /*   to perform adequate scaling.  Example:                              */
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  /*                                                                       */
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  /*     x_ppem = 14                                                       */
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  /*     y_ppem = 10                                                       */
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  /*                                                                       */
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  /*   We choose ppem = x_ppem = 14 as the CVT scaling size.  All cvt      */
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  /*   entries are scaled to it.                                           */
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  /*                                                                       */
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  /*     x_ratio = 1.0                                                     */
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  /*     y_ratio = y_ppem/ppem (< 1.0)                                     */
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  /*                                                                       */
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  /*   We compute the current ratio like:                                  */
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  /*                                                                       */
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  /*   - If projVector is horizontal,                                      */
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  /*       ratio = x_ratio = 1.0                                           */
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  /*                                                                       */
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  /*   - if projVector is vertical,                                        */
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  /*       ratio = y_ratio                                                 */
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  /*                                                                       */
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  /*   - else,                                                             */
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  /*       ratio = sqrt( (proj.x * x_ratio) ^ 2 + (proj.y * y_ratio) ^ 2 ) */
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  /*                                                                       */
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  /*   Reading a cvt value returns                                         */
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  /*     ratio * cvt[index]                                                */
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  /*                                                                       */
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  /*   Writing a cvt value in pixels:                                      */
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  /*     cvt[index] / ratio                                                */
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  /*                                                                       */
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  /*   The current ppem is simply                                          */
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  /*     ratio * ppem                                                      */
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  /*                                                                       */
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  /*************************************************************************/
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  /*************************************************************************/
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  /*                                                                       */
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  /* Metrics used by the TrueType size and context objects.                */
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  /*                                                                       */
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  typedef struct  TT_Size_Metrics_
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  {
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    /* for non-square pixels */
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    FT_Long     x_ratio;
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    FT_Long     y_ratio;
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    FT_UShort   ppem;               /* maximum ppem size              */
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    FT_Long     ratio;              /* current ratio                  */
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    FT_Fixed    scale;
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    FT_F26Dot6  compensations[4];   /* device-specific compensations  */
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    FT_Bool     valid;
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    FT_Bool     rotated;            /* `is the glyph rotated?'-flag   */
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    FT_Bool     stretched;          /* `is the glyph stretched?'-flag */
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  } TT_Size_Metrics;
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  /*************************************************************************/
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  /*                                                                       */
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  /* TrueType size class.                                                  */
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  /*                                                                       */
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  typedef struct  TT_SizeRec_
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  {
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    FT_SizeRec         root;
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    /* we have our own copy of metrics so that we can modify */
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    /* it without affecting auto-hinting (when used)         */
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    FT_Size_Metrics    metrics;
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    TT_Size_Metrics    ttmetrics;
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    FT_ULong           strike_index;      /* 0xFFFFFFFF to indicate invalid */
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#ifdef TT_USE_BYTECODE_INTERPRETER
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    FT_UInt            num_function_defs; /* number of function definitions */
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    FT_UInt            max_function_defs;
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    TT_DefArray        function_defs;     /* table of function definitions  */
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    FT_UInt            num_instruction_defs;  /* number of ins. definitions */
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    FT_UInt            max_instruction_defs;
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    TT_DefArray        instruction_defs;      /* table of ins. definitions  */
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    FT_UInt            max_func;
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    FT_UInt            max_ins;
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    TT_CodeRangeTable  codeRangeTable;
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    TT_GraphicsState   GS;
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    FT_ULong           cvt_size;      /* the scaled control value table */
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    FT_Long*           cvt;
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    FT_UShort          storage_size; /* The storage area is now part of */
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    FT_Long*           storage;      /* the instance                    */
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    TT_GlyphZoneRec    twilight;     /* The instance's twilight zone    */
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    /* debugging variables */
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    /* When using the debugger, we must keep the */
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    /* execution context tied to the instance    */
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    /* object rather than asking it on demand.   */
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    FT_Bool            debug;
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    TT_ExecContext     context;
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    FT_Bool            bytecode_ready;
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    FT_Bool            cvt_ready;
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#endif /* TT_USE_BYTECODE_INTERPRETER */
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  } TT_SizeRec;
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  /*************************************************************************/
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  /*                                                                       */
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  /* TrueType driver class.                                                */
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  /*                                                                       */
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  typedef struct  TT_DriverRec_
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  {
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    FT_DriverRec     root;
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    TT_ExecContext   context;  /* execution context        */
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    TT_GlyphZoneRec  zone;     /* glyph loader points zone */
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    void*            extension_component;
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  } TT_DriverRec;
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  /* Note: All of the functions below (except tt_size_reset()) are used    */
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  /* as function pointers in a FT_Driver_ClassRec.  Therefore their        */
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  /* parameters are of types FT_Face, FT_Size, etc., rather than TT_Face,  */
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  /* TT_Size, etc., so that the compiler can confirm that the types and    */
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  /* number of parameters are correct.  In all cases the FT_xxx types are  */
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  /* cast to their TT_xxx counterparts inside the functions since FreeType */
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  /* will always use the TT driver to create them.                         */
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  /*************************************************************************/
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  /*                                                                       */
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  /* Face functions                                                        */
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  /*                                                                       */
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  FT_LOCAL( FT_Error )
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  tt_face_init( FT_Stream      stream,
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                FT_Face        ttface,      /* TT_Face */
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                FT_Int         face_index,
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                FT_Int         num_params,
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                FT_Parameter*  params );
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  FT_LOCAL( void )
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  tt_face_done( FT_Face  ttface );          /* TT_Face */
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  /*************************************************************************/
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  /*                                                                       */
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  /* Size functions                                                        */
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  /*                                                                       */
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  FT_LOCAL( FT_Error )
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  tt_size_init( FT_Size  ttsize );          /* TT_Size */
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  FT_LOCAL( void )
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  tt_size_done( FT_Size  ttsize );          /* TT_Size */
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#ifdef TT_USE_BYTECODE_INTERPRETER
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  FT_LOCAL( FT_Error )
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  tt_size_run_fpgm( TT_Size  size,
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                    FT_Bool  pedantic );
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  FT_LOCAL( FT_Error )
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  tt_size_run_prep( TT_Size  size,
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                    FT_Bool  pedantic );
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  FT_LOCAL( FT_Error )
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  tt_size_ready_bytecode( TT_Size  size,
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                          FT_Bool  pedantic );
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#endif /* TT_USE_BYTECODE_INTERPRETER */
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  FT_LOCAL( FT_Error )
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  tt_size_reset( TT_Size  size );
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   408
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   409
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  /*************************************************************************/
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  /*                                                                       */
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  /* Driver functions                                                      */
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  /*                                                                       */
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  FT_LOCAL( FT_Error )
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  tt_driver_init( FT_Module  ttdriver );    /* TT_Driver */
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  FT_LOCAL( void )
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  tt_driver_done( FT_Module  ttdriver );    /* TT_Driver */
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  /*************************************************************************/
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  /*                                                                       */
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  /* Slot functions                                                        */
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  /*                                                                       */
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  FT_LOCAL( FT_Error )
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  tt_slot_init( FT_GlyphSlot  slot );
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FT_END_HEADER
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   430
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#endif /* __TTOBJS_H__ */
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/* END */