ftobjs.h - This C++ header file provides a set of macros an…

/src/freetype/include/freetype/internal/ftobjs.h

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/***************************************************************************/
/*                                                                         */
/*  ftobjs.h                                                               */
/*                                                                         */
/*    The FreeType private base classes (specification).                   */
/*                                                                         */
/*  Copyright 1996-2006, 2008, 2010, 2012 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.                                        */
/*                                                                         */
/***************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /*  This file contains the definition of all internal FreeType classes.  */
  /*                                                                       */
  /*************************************************************************/


#ifndef __FTOBJS_H__
#define __FTOBJS_H__

#include <ft2build.h>
#include FT_RENDER_H
#include FT_SIZES_H
#include FT_LCD_FILTER_H
#include FT_INTERNAL_MEMORY_H
#include FT_INTERNAL_GLYPH_LOADER_H
#include FT_INTERNAL_DRIVER_H
#include FT_INTERNAL_AUTOHINT_H
#include FT_INTERNAL_SERVICE_H
#include FT_INTERNAL_PIC_H

#ifdef FT_CONFIG_OPTION_INCREMENTAL
#include FT_INCREMENTAL_H
#endif


FT_BEGIN_HEADER


  /*************************************************************************/
  /*                                                                       */
  /* Some generic definitions.                                             */
  /*                                                                       */
#ifndef TRUE
#define TRUE  1
#endif

#ifndef FALSE
#define FALSE  0
#endif

#ifndef NULL
#define NULL  (void*)0
#endif


  /*************************************************************************/
  /*                                                                       */
  /* The min and max functions missing in C.  As usual, be careful not to  */
  /* write things like FT_MIN( a++, b++ ) to avoid side effects.           */
  /*                                                                       */
#define FT_MIN( a, b )  ( (a) < (b) ? (a) : (b) )
#define FT_MAX( a, b )  ( (a) > (b) ? (a) : (b) )

#define FT_ABS( a )     ( (a) < 0 ? -(a) : (a) )


#define FT_PAD_FLOOR( x, n )  ( (x) & ~((n)-1) )
#define FT_PAD_ROUND( x, n )  FT_PAD_FLOOR( (x) + ((n)/2), n )
#define FT_PAD_CEIL( x, n )   FT_PAD_FLOOR( (x) + ((n)-1), n )

#define FT_PIX_FLOOR( x )     ( (x) & ~63 )
#define FT_PIX_ROUND( x )     FT_PIX_FLOOR( (x) + 32 )
#define FT_PIX_CEIL( x )      FT_PIX_FLOOR( (x) + 63 )


  /*
   *  Return the highest power of 2 that is <= value; this correspond to
   *  the highest bit in a given 32-bit value.
   */
  FT_BASE( FT_UInt32 )
  ft_highpow2( FT_UInt32  value );


  /*
   *  character classification functions -- since these are used to parse
   *  font files, we must not use those in <ctypes.h> which are
   *  locale-dependent
   */
#define  ft_isdigit( x )   ( ( (unsigned)(x) - '0' ) < 10U )

#define  ft_isxdigit( x )  ( ( (unsigned)(x) - '0' ) < 10U || \
                             ( (unsigned)(x) - 'a' ) < 6U  || \
                             ( (unsigned)(x) - 'A' ) < 6U  )

  /* the next two macros assume ASCII representation */
#define  ft_isupper( x )  ( ( (unsigned)(x) - 'A' ) < 26U )
#define  ft_islower( x )  ( ( (unsigned)(x) - 'a' ) < 26U )

#define  ft_isalpha( x )  ( ft_isupper( x ) || ft_islower( x ) )
#define  ft_isalnum( x )  ( ft_isdigit( x ) || ft_isalpha( x ) )


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****                       C H A R M A P S                           ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/

  /* handle to internal charmap object */
  typedef struct FT_CMapRec_*              FT_CMap;

  /* handle to charmap class structure */
  typedef const struct FT_CMap_ClassRec_*  FT_CMap_Class;

  /* internal charmap object structure */
  typedef struct  FT_CMapRec_
  {
    FT_CharMapRec  charmap;
    FT_CMap_Class  clazz;

  } FT_CMapRec;

  /* typecase any pointer to a charmap handle */
#define FT_CMAP( x )              ((FT_CMap)( x ))

  /* obvious macros */
#define FT_CMAP_PLATFORM_ID( x )  FT_CMAP( x )->charmap.platform_id
#define FT_CMAP_ENCODING_ID( x )  FT_CMAP( x )->charmap.encoding_id
#define FT_CMAP_ENCODING( x )     FT_CMAP( x )->charmap.encoding
#define FT_CMAP_FACE( x )         FT_CMAP( x )->charmap.face


  /* class method definitions */
  typedef FT_Error
  (*FT_CMap_InitFunc)( FT_CMap     cmap,
                       FT_Pointer  init_data );

  typedef void
  (*FT_CMap_DoneFunc)( FT_CMap  cmap );

  typedef FT_UInt
  (*FT_CMap_CharIndexFunc)( FT_CMap    cmap,
                            FT_UInt32  char_code );

  typedef FT_UInt
  (*FT_CMap_CharNextFunc)( FT_CMap     cmap,
                           FT_UInt32  *achar_code );

  typedef FT_UInt
  (*FT_CMap_CharVarIndexFunc)( FT_CMap    cmap,
                               FT_CMap    unicode_cmap,
                               FT_UInt32  char_code,
                               FT_UInt32  variant_selector );

  typedef FT_Bool
  (*FT_CMap_CharVarIsDefaultFunc)( FT_CMap    cmap,
                                   FT_UInt32  char_code,
                                   FT_UInt32  variant_selector );

  typedef FT_UInt32 *
  (*FT_CMap_VariantListFunc)( FT_CMap    cmap,
                              FT_Memory  mem );

  typedef FT_UInt32 *
  (*FT_CMap_CharVariantListFunc)( FT_CMap    cmap,
                                  FT_Memory  mem,
                                  FT_UInt32  char_code );

  typedef FT_UInt32 *
  (*FT_CMap_VariantCharListFunc)( FT_CMap    cmap,
                                  FT_Memory  mem,
                                  FT_UInt32  variant_selector );


  typedef struct  FT_CMap_ClassRec_
  {
    FT_ULong               size;
    FT_CMap_InitFunc       init;
    FT_CMap_DoneFunc       done;
    FT_CMap_CharIndexFunc  char_index;
    FT_CMap_CharNextFunc   char_next;

    /* Subsequent entries are special ones for format 14 -- the variant */
    /* selector subtable which behaves like no other                    */

    FT_CMap_CharVarIndexFunc      char_var_index;
    FT_CMap_CharVarIsDefaultFunc  char_var_default;
    FT_CMap_VariantListFunc       variant_list;
    FT_CMap_CharVariantListFunc   charvariant_list;
    FT_CMap_VariantCharListFunc   variantchar_list;

  } FT_CMap_ClassRec;

#ifndef FT_CONFIG_OPTION_PIC

#define FT_DECLARE_CMAP_CLASS(class_) \
    FT_CALLBACK_TABLE const FT_CMap_ClassRec class_;

#define FT_DEFINE_CMAP_CLASS(class_, size_, init_, done_, char_index_,       \
        char_next_, char_var_index_, char_var_default_, variant_list_,       \
        charvariant_list_, variantchar_list_)                                \
  FT_CALLBACK_TABLE_DEF                                                      \
  const FT_CMap_ClassRec class_ =                                            \
  {                                                                          \
    size_, init_, done_, char_index_, char_next_, char_var_index_,           \
    char_var_default_, variant_list_, charvariant_list_, variantchar_list_   \
  };
#else /* FT_CONFIG_OPTION_PIC */

#define FT_DECLARE_CMAP_CLASS(class_) \
    void FT_Init_Class_##class_( FT_Library library, FT_CMap_ClassRec*  clazz);

#define FT_DEFINE_CMAP_CLASS(class_, size_, init_, done_, char_index_,       \
        char_next_, char_var_index_, char_var_default_, variant_list_,       \
        charvariant_list_, variantchar_list_)                                \
  void                                                                       \
  FT_Init_Class_##class_( FT_Library library,                                \
                          FT_CMap_ClassRec*  clazz)                          \
  {                                                                          \
    FT_UNUSED(library);                                                      \
    clazz->size = size_;                                                     \
    clazz->init = init_;                                                     \
    clazz->done = done_;                                                     \
    clazz->char_index = char_index_;                                         \
    clazz->char_next = char_next_;                                           \
    clazz->char_var_index = char_var_index_;                                 \
    clazz->char_var_default = char_var_default_;                             \
    clazz->variant_list = variant_list_;                                     \
    clazz->charvariant_list = charvariant_list_;                             \
    clazz->variantchar_list = variantchar_list_;                             \
  }
#endif /* FT_CONFIG_OPTION_PIC */

  /* create a new charmap and add it to charmap->face */
  FT_BASE( FT_Error )
  FT_CMap_New( FT_CMap_Class  clazz,
               FT_Pointer     init_data,
               FT_CharMap     charmap,
               FT_CMap       *acmap );

  /* destroy a charmap and remove it from face's list */
  FT_BASE( void )
  FT_CMap_Done( FT_CMap  cmap );


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_Face_InternalRec                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This structure contains the internal fields of each FT_Face        */
  /*    object.  These fields may change between different releases of     */
  /*    FreeType.                                                          */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    max_points ::                                                      */
  /*      The maximal number of points used to store the vectorial outline */
  /*      of any glyph in this face.  If this value cannot be known in     */
  /*      advance, or if the face isn't scalable, this should be set to 0. */
  /*      Only relevant for scalable formats.                              */
  /*                                                                       */
  /*    max_contours ::                                                    */
  /*      The maximal number of contours used to store the vectorial       */
  /*      outline of any glyph in this face.  If this value cannot be      */
  /*      known in advance, or if the face isn't scalable, this should be  */
  /*      set to 0.  Only relevant for scalable formats.                   */
  /*                                                                       */
  /*    transform_matrix ::                                                */
  /*      A 2x2 matrix of 16.16 coefficients used to transform glyph       */
  /*      outlines after they are loaded from the font.  Only used by the  */
  /*      convenience functions.                                           */
  /*                                                                       */
  /*    transform_delta ::                                                 */
  /*      A translation vector used to transform glyph outlines after they */
  /*      are loaded from the font.  Only used by the convenience          */
  /*      functions.                                                       */
  /*                                                                       */
  /*    transform_flags ::                                                 */
  /*      Some flags used to classify the transform.  Only used by the     */
  /*      convenience functions.                                           */
  /*                                                                       */
  /*    services ::                                                        */
  /*      A cache for frequently used services.  It should be only         */
  /*      accessed with the macro `FT_FACE_LOOKUP_SERVICE'.                */
  /*                                                                       */
  /*    incremental_interface ::                                           */
  /*      If non-null, the interface through which glyph data and metrics  */
  /*      are loaded incrementally for faces that do not provide all of    */
  /*      this data when first opened.  This field exists only if          */
  /*      @FT_CONFIG_OPTION_INCREMENTAL is defined.                        */
  /*                                                                       */
  /*    ignore_unpatented_hinter ::                                        */
  /*      This boolean flag instructs the glyph loader to ignore the       */
  /*      native font hinter, if one is found.  This is exclusively used   */
  /*      in the case when the unpatented hinter is compiled within the    */
  /*      library.                                                         */
  /*                                                                       */
  /*    refcount ::                                                        */
  /*      A counter initialized to~1 at the time an @FT_Face structure is  */
  /*      created.  @FT_Reference_Face increments this counter, and        */
  /*      @FT_Done_Face only destroys a face if the counter is~1,          */
  /*      otherwise it simply decrements it.                               */
  /*                                                                       */
  typedef struct  FT_Face_InternalRec_
  {
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
    FT_UShort           reserved1;
    FT_Short            reserved2;
#endif
    FT_Matrix           transform_matrix;
    FT_Vector           transform_delta;
    FT_Int              transform_flags;

    FT_ServiceCacheRec  services;

#ifdef FT_CONFIG_OPTION_INCREMENTAL
    FT_Incremental_InterfaceRec*  incremental_interface;
#endif

    FT_Bool             ignore_unpatented_hinter;
    FT_UInt             refcount;

  } FT_Face_InternalRec;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_Slot_InternalRec                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This structure contains the internal fields of each FT_GlyphSlot   */
  /*    object.  These fields may change between different releases of     */
  /*    FreeType.                                                          */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    loader            :: The glyph loader object used to load outlines */
  /*                         into the glyph slot.                          */
  /*                                                                       */
  /*    flags             :: Possible values are zero or                   */
  /*                         FT_GLYPH_OWN_BITMAP.  The latter indicates    */
  /*                         that the FT_GlyphSlot structure owns the      */
  /*                         bitmap buffer.                                */
  /*                                                                       */
  /*    glyph_transformed :: Boolean.  Set to TRUE when the loaded glyph   */
  /*                         must be transformed through a specific        */
  /*                         font transformation.  This is _not_ the same  */
  /*                         as the face transform set through             */
  /*                         FT_Set_Transform().                           */
  /*                                                                       */
  /*    glyph_matrix      :: The 2x2 matrix corresponding to the glyph     */
  /*                         transformation, if necessary.                 */
  /*                                                                       */
  /*    glyph_delta       :: The 2d translation vector corresponding to    */
  /*                         the glyph transformation, if necessary.       */
  /*                                                                       */
  /*    glyph_hints       :: Format-specific glyph hints management.       */
  /*                                                                       */

#define FT_GLYPH_OWN_BITMAP  0x1

  typedef struct  FT_Slot_InternalRec_
  {
    FT_GlyphLoader  loader;
    FT_UInt         flags;
    FT_Bool         glyph_transformed;
    FT_Matrix       glyph_matrix;
    FT_Vector       glyph_delta;
    void*           glyph_hints;

  } FT_GlyphSlot_InternalRec;


#if 0

  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_Size_InternalRec                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This structure contains the internal fields of each FT_Size        */
  /*    object.  Currently, it's empty.                                    */
  /*                                                                       */
  /*************************************************************************/

  typedef struct  FT_Size_InternalRec_
  {
    /* empty */

  } FT_Size_InternalRec;

#endif


  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****                         M O D U L E S                           ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_ModuleRec                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A module object instance.                                          */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    clazz   :: A pointer to the module's class.                        */
  /*                                                                       */
  /*    library :: A handle to the parent library object.                  */
  /*                                                                       */
  /*    memory  :: A handle to the memory manager.                         */
  /*                                                                       */
  typedef struct  FT_ModuleRec_
  {
    FT_Module_Class*  clazz;
    FT_Library        library;
    FT_Memory         memory;

  } FT_ModuleRec;


  /* typecast an object to an FT_Module */
#define FT_MODULE( x )          ((FT_Module)( x ))
#define FT_MODULE_CLASS( x )    FT_MODULE( x )->clazz
#define FT_MODULE_LIBRARY( x )  FT_MODULE( x )->library
#define FT_MODULE_MEMORY( x )   FT_MODULE( x )->memory


#define FT_MODULE_IS_DRIVER( x )  ( FT_MODULE_CLASS( x )->module_flags & \
                                    FT_MODULE_FONT_DRIVER )

#define FT_MODULE_IS_RENDERER( x )  ( FT_MODULE_CLASS( x )->module_flags & \
                                      FT_MODULE_RENDERER )

#define FT_MODULE_IS_HINTER( x )  ( FT_MODULE_CLASS( x )->module_flags & \
                                    FT_MODULE_HINTER )

#define FT_MODULE_IS_STYLER( x )  ( FT_MODULE_CLASS( x )->module_flags & \
                                    FT_MODULE_STYLER )

#define FT_DRIVER_IS_SCALABLE( x )  ( FT_MODULE_CLASS( x )->module_flags & \
                                      FT_MODULE_DRIVER_SCALABLE )

#define FT_DRIVER_USES_OUTLINES( x )  !( FT_MODULE_CLASS( x )->module_flags & \
                                         FT_MODULE_DRIVER_NO_OUTLINES )

#define FT_DRIVER_HAS_HINTER( x )  ( FT_MODULE_CLASS( x )->module_flags & \
                                     FT_MODULE_DRIVER_HAS_HINTER )


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Get_Module_Interface                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Finds a module and returns its specific interface as a typeless    */
  /*    pointer.                                                           */
  /*                                                                       */
  /* <Input>                                                               */
  /*    library     :: A handle to the library object.                     */
  /*                                                                       */
  /*    module_name :: The module's name (as an ASCII string).             */
  /*                                                                       */
  /* <Return>                                                              */
  /*    A module-specific interface if available, 0 otherwise.             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    You should better be familiar with FreeType internals to know      */
  /*    which module to look for, and what its interface is :-)            */
  /*                                                                       */
  FT_BASE( const void* )
  FT_Get_Module_Interface( FT_Library   library,
                           const char*  mod_name );

  FT_BASE( FT_Pointer )
  ft_module_get_service( FT_Module    module,
                         const char*  service_id );

 /* */


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****               FACE, SIZE & GLYPH SLOT OBJECTS                   ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/

  /* a few macros used to perform easy typecasts with minimal brain damage */

#define FT_FACE( x )          ((FT_Face)(x))
#define FT_SIZE( x )          ((FT_Size)(x))
#define FT_SLOT( x )          ((FT_GlyphSlot)(x))

#define FT_FACE_DRIVER( x )   FT_FACE( x )->driver
#define FT_FACE_LIBRARY( x )  FT_FACE_DRIVER( x )->root.library
#define FT_FACE_MEMORY( x )   FT_FACE( x )->memory
#define FT_FACE_STREAM( x )   FT_FACE( x )->stream

#define FT_SIZE_FACE( x )     FT_SIZE( x )->face
#define FT_SLOT_FACE( x )     FT_SLOT( x )->face

#define FT_FACE_SLOT( x )     FT_FACE( x )->glyph
#define FT_FACE_SIZE( x )     FT_FACE( x )->size


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_New_GlyphSlot                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    It is sometimes useful to have more than one glyph slot for a      */
  /*    given face object.  This function is used to create additional     */
  /*    slots.  All of them are automatically discarded when the face is   */
  /*    destroyed.                                                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face  :: A handle to a parent face object.                         */
  /*                                                                       */
  /* <Output>                                                              */
  /*    aslot :: A handle to a new glyph slot object.                      */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_BASE( FT_Error )
  FT_New_GlyphSlot( FT_Face        face,
                    FT_GlyphSlot  *aslot );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Done_GlyphSlot                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Destroys a given glyph slot.  Remember however that all slots are  */
  /*    automatically destroyed with its parent.  Using this function is   */
  /*    not always mandatory.                                              */
  /*                                                                       */
  /* <Input>                                                               */
  /*    slot :: A handle to a target glyph slot.                           */
  /*                                                                       */
  FT_BASE( void )
  FT_Done_GlyphSlot( FT_GlyphSlot  slot );

 /* */

#define FT_REQUEST_WIDTH( req )                                            \
          ( (req)->horiResolution                                          \
              ? (FT_Pos)( (req)->width * (req)->horiResolution + 36 ) / 72 \
              : (req)->width )

#define FT_REQUEST_HEIGHT( req )                                            \
          ( (req)->vertResolution                                           \
              ? (FT_Pos)( (req)->height * (req)->vertResolution + 36 ) / 72 \
              : (req)->height )


  /* Set the metrics according to a bitmap strike. */
  FT_BASE( void )
  FT_Select_Metrics( FT_Face   face,
                     FT_ULong  strike_index );


  /* Set the metrics according to a size request. */
  FT_BASE( void )
  FT_Request_Metrics( FT_Face          face,
                      FT_Size_Request  req );


  /* Match a size request against `available_sizes'. */
  FT_BASE( FT_Error )
  FT_Match_Size( FT_Face          face,
                 FT_Size_Request  req,
                 FT_Bool          ignore_width,
                 FT_ULong*        size_index );


  /* Use the horizontal metrics to synthesize the vertical metrics. */
  /* If `advance' is zero, it is also synthesized.                  */
  FT_BASE( void )
  ft_synthesize_vertical_metrics( FT_Glyph_Metrics*  metrics,
                                  FT_Pos             advance );


  /* Free the bitmap of a given glyphslot when needed (i.e., only when it */
  /* was allocated with ft_glyphslot_alloc_bitmap).                       */
  FT_BASE( void )
  ft_glyphslot_free_bitmap( FT_GlyphSlot  slot );


  /* Allocate a new bitmap buffer in a glyph slot. */
  FT_BASE( FT_Error )
  ft_glyphslot_alloc_bitmap( FT_GlyphSlot  slot,
                             FT_ULong      size );


  /* Set the bitmap buffer in a glyph slot to a given pointer.  The buffer */
  /* will not be freed by a later call to ft_glyphslot_free_bitmap.        */
  FT_BASE( void )
  ft_glyphslot_set_bitmap( FT_GlyphSlot  slot,
                           FT_Byte*      buffer );


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****                        R E N D E R E R S                        ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


#define FT_RENDERER( x )      ((FT_Renderer)( x ))
#define FT_GLYPH( x )         ((FT_Glyph)( x ))
#define FT_BITMAP_GLYPH( x )  ((FT_BitmapGlyph)( x ))
#define FT_OUTLINE_GLYPH( x ) ((FT_OutlineGlyph)( x ))


  typedef struct  FT_RendererRec_
  {
    FT_ModuleRec            root;
    FT_Renderer_Class*      clazz;
    FT_Glyph_Format         glyph_format;
    FT_Glyph_Class          glyph_class;

    FT_Raster               raster;
    FT_Raster_Render_Func   raster_render;
    FT_Renderer_RenderFunc  render;

  } FT_RendererRec;


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****                    F O N T   D R I V E R S                      ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


  /* typecast a module into a driver easily */
#define FT_DRIVER( x )        ((FT_Driver)(x))

  /* typecast a module as a driver, and get its driver class */
#define FT_DRIVER_CLASS( x )  FT_DRIVER( x )->clazz


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_DriverRec                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The root font driver class.  A font driver is responsible for      */
  /*    managing and loading font files of a given format.                 */
  /*                                                                       */
  /*  <Fields>                                                             */
  /*     root         :: Contains the fields of the root module class.     */
  /*                                                                       */
  /*     clazz        :: A pointer to the font driver's class.  Note that  */
  /*                     this is NOT root.clazz.  `class' wasn't used      */
  /*                     as it is a reserved word in C++.                  */
  /*                                                                       */
  /*     faces_list   :: The list of faces currently opened by this        */
  /*                     driver.                                           */
  /*                                                                       */
  /*     glyph_loader :: The glyph loader for all faces managed by this    */
  /*                     driver.  This object isn't defined for unscalable */
  /*                     formats.                                          */
  /*                                                                       */
  typedef struct  FT_DriverRec_
  {
    FT_ModuleRec     root;
    FT_Driver_Class  clazz;
    FT_ListRec       faces_list;
    FT_GlyphLoader   glyph_loader;

  } FT_DriverRec;


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****                       L I B R A R I E S                         ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


  /* This hook is used by the TrueType debugger.  It must be set to an */
  /* alternate truetype bytecode interpreter function.                 */
#define FT_DEBUG_HOOK_TRUETYPE            0


  /* Set this debug hook to a non-null pointer to force unpatented hinting */
  /* for all faces when both TT_USE_BYTECODE_INTERPRETER and               */
  /* TT_CONFIG_OPTION_UNPATENTED_HINTING are defined.  This is only used   */
  /* during debugging.                                                     */
#define FT_DEBUG_HOOK_UNPATENTED_HINTING  1


  typedef void  (*FT_Bitmap_LcdFilterFunc)( FT_Bitmap*      bitmap,
                                            FT_Render_Mode  render_mode,
                                            FT_Library      library );


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_LibraryRec                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The FreeType library class.  This is the root of all FreeType      */
  /*    data.  Use FT_New_Library() to create a library object, and        */
  /*    FT_Done_Library() to discard it and all child objects.             */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    memory           :: The library's memory object.  Manages memory   */
  /*                        allocation.                                    */
  /*                                                                       */
  /*    version_major    :: The major version number of the library.       */
  /*                                                                       */
  /*    version_minor    :: The minor version number of the library.       */
  /*                                                                       */
  /*    version_patch    :: The current patch level of the library.        */
  /*                                                                       */
  /*    num_modules      :: The number of modules currently registered     */
  /*                        within this library.  This is set to 0 for new */
  /*                        libraries.  New modules are added through the  */
  /*                        FT_Add_Module() API function.                  */
  /*                                                                       */
  /*    modules          :: A table used to store handles to the currently */
  /*                        registered modules. Note that each font driver */
  /*                        contains a list of its opened faces.           */
  /*                                                                       */
  /*    renderers        :: The list of renderers currently registered     */
  /*                        within the library.                            */
  /*                                                                       */
  /*    cur_renderer     :: The current outline renderer.  This is a       */
  /*                        shortcut used to avoid parsing the list on     */
  /*                        each call to FT_Outline_Render().  It is a     */
  /*                        handle to the current renderer for the         */
  /*                        FT_GLYPH_FORMAT_OUTLINE format.                */
  /*                                                                       */
  /*    auto_hinter      :: XXX                                            */
  /*                                                                       */
  /*    raster_pool      :: The raster object's render pool.  This can     */
  /*                        ideally be changed dynamically at run-time.    */
  /*                                                                       */
  /*    raster_pool_size :: The size of the render pool in bytes.          */
  /*                                                                       */
  /*    debug_hooks      :: XXX                                            */
  /*                                                                       */
  /*    lcd_filter       :: If subpixel rendering is activated, the        */
  /*                        selected LCD filter mode.                      */
  /*                                                                       */
  /*    lcd_extra        :: If subpixel rendering is activated, the number */
  /*                        of extra pixels needed for the LCD filter.     */
  /*                                                                       */
  /*    lcd_weights      :: If subpixel rendering is activated, the LCD    */
  /*                        filter weights, if any.                        */
  /*                                                                       */
  /*    lcd_filter_func  :: If subpixel rendering is activated, the LCD    */
  /*                        filtering callback function.                   */
  /*                                                                       */
  /*    pic_container    :: Contains global structs and tables, instead    */
  /*                        of defining them globallly.                    */
  /*                                                                       */
  /*    refcount         :: A counter initialized to~1 at the time an      */
  /*                        @FT_Library structure is created.              */
  /*                        @FT_Reference_Library increments this counter, */
  /*                        and @FT_Done_Library only destroys a library   */
  /*                        if the counter is~1, otherwise it simply       */
  /*                        decrements it.                                 */
  /*                                                                       */
  typedef struct  FT_LibraryRec_
  {
    FT_Memory          memory;           /* library's memory manager */

    FT_Int             version_major;
    FT_Int             version_minor;
    FT_Int             version_patch;

    FT_UInt            num_modules;
    FT_Module          modules[FT_MAX_MODULES];  /* module objects  */

    FT_ListRec         renderers;        /* list of renderers        */
    FT_Renderer        cur_renderer;     /* current outline renderer */
    FT_Module          auto_hinter;

    FT_Byte*           raster_pool;      /* scan-line conversion */
                                         /* render pool          */
    FT_ULong           raster_pool_size; /* size of render pool in bytes */

    FT_DebugHook_Func  debug_hooks[4];

#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
    FT_LcdFilter             lcd_filter;
    FT_Int                   lcd_extra;        /* number of extra pixels */
    FT_Byte                  lcd_weights[7];   /* filter weights, if any */
    FT_Bitmap_LcdFilterFunc  lcd_filter_func;  /* filtering callback     */
#endif

#ifdef FT_CONFIG_OPTION_PIC
    FT_PIC_Container   pic_container;
#endif

    FT_UInt            refcount;

  } FT_LibraryRec;


  FT_BASE( FT_Renderer )
  FT_Lookup_Renderer( FT_Library       library,
                      FT_Glyph_Format  format,
                      FT_ListNode*     node );

  FT_BASE( FT_Error )
  FT_Render_Glyph_Internal( FT_Library      library,
                            FT_GlyphSlot    slot,
                            FT_Render_Mode  render_mode );

  typedef const char*
  (*FT_Face_GetPostscriptNameFunc)( FT_Face  face );

  typedef FT_Error
  (*FT_Face_GetGlyphNameFunc)( FT_Face     face,
                               FT_UInt     glyph_index,
                               FT_Pointer  buffer,
                               FT_UInt     buffer_max );

  typedef FT_UInt
  (*FT_Face_GetGlyphNameIndexFunc)( FT_Face     face,
                                    FT_String*  glyph_name );


#ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM

  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_New_Memory                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Creates a new memory object.                                       */
  /*                                                                       */
  /* <Return>                                                              */
  /*    A pointer to the new memory object.  0 in case of error.           */
  /*                                                                       */
  FT_BASE( FT_Memory )
  FT_New_Memory( void );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Done_Memory                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Discards memory manager.                                           */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory :: A handle to the memory manager.                          */
  /*                                                                       */
  FT_BASE( void )
  FT_Done_Memory( FT_Memory  memory );

#endif /* !FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */


  /* Define default raster's interface.  The default raster is located in  */
  /* `src/base/ftraster.c'.                                                */
  /*                                                                       */
  /* Client applications can register new rasters through the              */
  /* FT_Set_Raster() API.                                                  */

#ifndef FT_NO_DEFAULT_RASTER
  FT_EXPORT_VAR( FT_Raster_Funcs )  ft_default_raster;
#endif

  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****              PIC-Support Macros for ftimage.h                   ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Macro>                                                               */
  /*    FT_DEFINE_OUTLINE_FUNCS                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Used to initialize an instance of FT_Outline_Funcs struct.         */
  /*    When FT_CONFIG_OPTION_PIC is defined an init funtion will need to  */
  /*    called with a pre-allocated stracture to be filled.                */
  /*    When FT_CONFIG_OPTION_PIC is not defined the struct will be        */
  /*    allocated in the global scope (or the scope where the macro        */
  /*    is used).                                                          */
  /*                                                                       */
#ifndef FT_CONFIG_OPTION_PIC

#define FT_DEFINE_OUTLINE_FUNCS(class_, move_to_, line_to_, conic_to_,       \
                                cubic_to_, shift_, delta_)                   \
  static const FT_Outline_Funcs class_ =                                     \
  {                                                                          \
    move_to_, line_to_, conic_to_, cubic_to_, shift_, delta_                 \
  };

#else /* FT_CONFIG_OPTION_PIC */

#define FT_DEFINE_OUTLINE_FUNCS(class_, move_to_, line_to_, conic_to_,       \
                                cubic_to_, shift_, delta_)                   \
  static FT_Error                                                            \
  Init_Class_##class_( FT_Outline_Funcs*  clazz )                            \
  {                                                                          \
    clazz->move_to = move_to_;                                               \
    clazz->line_to = line_to_;                                               \
    clazz->conic_to = conic_to_;                                             \
    clazz->cubic_to = cubic_to_;                                             \
    clazz->shift = shift_;…