www.pudn.com > freetype.rar > ftmm.h


/***************************************************************************/ 
/*                                                                         */ 
/*  ftmm.h                                                                 */ 
/*                                                                         */ 
/*    FreeType Multiple Master font interface (specification).             */ 
/*                                                                         */ 
/*  Copyright 1996-2001 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 __FTMM_H__ 
#define __FTMM_H__ 
 
 
#include "ft2build.h" 
#include "freetype/t1tables.h" 
 
 
FT_BEGIN_HEADER 
 
 
  /*************************************************************************/ 
  /*                                                                       */ 
  /* 
                                                             */ 
  /*    multiple_masters                                                   */ 
  /*                                                                       */ 
  /*                                                                */ 
  /*    Multiple Masters                                                   */ 
  /*                                                                       */ 
  /* <Abstract>                                                            */ 
  /*    How to manage Multiple Masters fonts.                              */ 
  /*                                                                       */ 
  /* <Description>                                                         */ 
  /*    The following types and functions are used to manage Multiple      */ 
  /*    Master fonts, i.e. the selection of specific design instances by   */ 
  /*    setting design axis coordinates.                                   */ 
  /*                                                                       */ 
  /*************************************************************************/ 
 
 
  /*************************************************************************/ 
  /*                                                                       */ 
  /* <Struct>                                                              */ 
  /*    FT_MM_Axis                                                         */ 
  /*                                                                       */ 
  /* <Description>                                                         */ 
  /*    A simple structure used to model a given axis in design space for  */ 
  /*    Multiple Masters fonts.                                            */ 
  /*                                                                       */ 
  /* <Fields>                                                              */ 
  /*    name    :: The axis's name.                                        */ 
  /*                                                                       */ 
  /*    minimum :: The axis's minimum design coordinate.                   */ 
  /*                                                                       */ 
  /*    maximum :: The axis's maximum design coordinate.                   */ 
  /*                                                                       */ 
  typedef struct  FT_MM_Axis_ 
  { 
    FT_String*  name; 
    FT_Long     minimum; 
    FT_Long     maximum; 
 
  } FT_MM_Axis; 
 
 
  /*************************************************************************/ 
  /*                                                                       */ 
  /* <Struct>                                                              */ 
  /*    FT_Multi_Master                                                    */ 
  /*                                                                       */ 
  /* <Description>                                                         */ 
  /*    A structure used to model the axes and space of a Multiple Masters */ 
  /*    font.                                                              */ 
  /*                                                                       */ 
  /* <Fields>                                                              */ 
  /*    num_axis    :: Number of axes.  Cannot exceed 4.                   */ 
  /*                                                                       */ 
  /*    num_designs :: Number of designs; should ne normally 2^num_axis    */ 
  /*                   even though the Type 1 specification strangely      */ 
  /*                   allows for intermediate designs to be present. This */ 
  /*                   number cannot exceed 16.                            */ 
  /*                                                                       */ 
  /*    axis        :: A table of axis descriptors.                        */ 
  /*                                                                       */ 
  typedef struct  FT_Multi_Master_ 
  { 
    FT_UInt     num_axis; 
    FT_UInt     num_designs; 
    FT_MM_Axis  axis[T1_MAX_MM_AXIS]; 
 
  } FT_Multi_Master; 
 
  /* */ 
 
  typedef FT_Error 
  (*FT_Get_MM_Func)( FT_Face           face, 
                     FT_Multi_Master*  master ); 
 
  typedef FT_Error 
  (*FT_Set_MM_Design_Func)( FT_Face   face, 
                            FT_UInt   num_coords, 
                            FT_Long*  coords ); 
 
  typedef FT_Error 
  (*FT_Set_MM_Blend_Func)( FT_Face   face, 
                           FT_UInt   num_coords, 
                           FT_Long*  coords ); 
 
 
  /*************************************************************************/ 
  /*                                                                       */ 
  /* <Function>                                                            */ 
  /*    FT_Get_Multi_Master                                                */ 
  /*                                                                       */ 
  /* <Description>                                                         */ 
  /*    Retrieves the Multiple Master descriptor of a given font.          */ 
  /*                                                                       */ 
  /* <Input>                                                               */ 
  /*    face    :: A handle to the source face.                            */ 
  /*                                                                       */ 
  /* <Output>                                                              */ 
  /*    amaster :: The Multiple Masters descriptor.                        */ 
  /*                                                                       */ 
  /* <Return>                                                              */ 
  /*    FreeType error code.  0 means success.                             */ 
  /*                                                                       */ 
  FT_EXPORT( FT_Error ) 
  FT_Get_Multi_Master( FT_Face           face, 
                       FT_Multi_Master  *amaster ); 
 
 
  /*************************************************************************/ 
  /*                                                                       */ 
  /* <Function>                                                            */ 
  /*    FT_Set_MM_Design_Coordinates                                       */ 
  /*                                                                       */ 
  /* <Description>                                                         */ 
  /*    For Multiple Masters fonts, choose an interpolated font design     */ 
  /*    through design coordinates.                                        */ 
  /*                                                                       */ 
  /* <InOut>                                                               */ 
  /*    face       :: A handle to the source face.                         */ 
  /*                                                                       */ 
  /* <Input>                                                               */ 
  /*    num_coords :: The number of design coordinates (must be equal to   */ 
  /*                  the number of axes in the font).                     */ 
  /*                                                                       */ 
  /*    coords     :: An array of design coordinates.                      */ 
  /*                                                                       */ 
  /* <Return>                                                              */ 
  /*    FreeType error code.  0 means success.                             */ 
  /*                                                                       */ 
  FT_EXPORT( FT_Error ) 
  FT_Set_MM_Design_Coordinates( FT_Face   face, 
                                FT_UInt   num_coords, 
                                FT_Long*  coords ); 
 
 
  /*************************************************************************/ 
  /*                                                                       */ 
  /* <Function>                                                            */ 
  /*    FT_Set_MM_Blend_Coordinates                                        */ 
  /*                                                                       */ 
  /* <Description>                                                         */ 
  /*    For Multiple Masters fonts, choose an interpolated font design     */ 
  /*    through normalized blend coordinates.                              */ 
  /*                                                                       */ 
  /* <InOut>                                                               */ 
  /*    face       :: A handle to the source face.                         */ 
  /*                                                                       */ 
  /* <Input>                                                               */ 
  /*    num_coords :: The number of design coordinates (must be equal to   */ 
  /*                  the number of axes in the font).                     */ 
  /*                                                                       */ 
  /*    coords     :: The design coordinates array (each element must be   */ 
  /*                  between 0 and 1.0).                                  */ 
  /*                                                                       */ 
  /* <Return>                                                              */ 
  /*    FreeType error code.  0 means success.                             */ 
  /*                                                                       */ 
  FT_EXPORT( FT_Error ) 
  FT_Set_MM_Blend_Coordinates( FT_Face    face, 
                               FT_UInt    num_coords, 
                               FT_Fixed*  coords ); 
 
 
  /* */ 
 
 
FT_END_HEADER 
 
#endif /* __FTMM_H__ */ 
 
 
/* END */ 
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