ftobjs.h

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

/***************************************************************************/
/*                                                                         */
/*  ftobjs.h                                                               */
/*                                                                         */
/*  The FreeType private base classes (specification).                     */
/*                                                                         */
/*  Copyright 1996-1999 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 <ftconfig.h>
#include <ftsystem.h>
#include <ftdriver.h>

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

#ifndef FALSE
#define FALSE  0
#endif

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

#ifndef UNUSED
#define UNUSED( arg )  ( (void)(arg) )
#endif


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

#ifndef MAX
#define MAX( a, b )  ( (a) > (b) ? (a) : (b) )
#endif

#ifndef ABS
#define ABS( a )     ( (a) < 0 ? -(a) : (a) )
#endif


  /*************************************************************************/
  /*                                                                       */
  /* <Macro>                                                               */
  /*    FT_SET_ERROR                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This macro is used to set an implicit `error' variable to a given  */
  /*    expression's value (usually a function call), and convert it to a  */
  /*    boolean which is set whenever the value is != 0.                   */
  /*                                                                       */
#undef  FT_SET_ERROR
#define FT_SET_ERROR( expression ) \
          ( (error = (expression)) != 0 )


  /*************************************************************************/
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  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Alloc                                                           */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Allocates a new block of memory.  The returned area is always      */
  /*    zero-filled, this is a strong convention in many FreeType parts.   */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory :: A handle to a given `memory object' where allocation     */
  /*              occurs.                                                  */
  /*                                                                       */
  /*    size   :: The size in bytes of the block to allocate.              */
  /*                                                                       */
  /* <Output>                                                              */
  /*    P      :: A pointer to the fresh new block.  It should be set to   */
  /*              NULL if `size' is 0, or in case of error.                */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  BASE_DEF
  FT_Error  FT_Alloc( FT_Memory  memory,
                      FT_Long    size,
                      void**     P );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Realloc                                                         */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Reallocates a block of memory pointed to by `*P' to `Size' bytes   */
  /*    from the heap, possibly changing `*P'.                             */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory :: A handle to a given `memory object' where allocation     */
  /*              occurs.                                                  */
  /*                                                                       */
  /*    current :: current block size in bytes                             */
  /*    size    :: the new block size in bytes                              */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    P      :: A pointer to the fresh new block.  It should be set to   */
  /*              NULL if `size' is 0, or in case of error.                */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    All callers of FT_Realloc _must_ provide the current block size    */
  /*    as well as the new one.                                            */
  /*                                                                       */
  /*    When the memory object's flag FT_memory_FLAG_NO_REALLOC is         */
  /*    set, this function will try to emulate a realloc through uses      */
  /*    of FT_Alloc and FT_Free. Otherwise, it will call the memory-       */
  /*    specific "realloc" implementation.                                 */
  /*                                                                       */
  /*    (Some embedded memorys do not have a working realloc).             */
  /*                                                                       */
  BASE_DEF
  FT_Error  FT_Realloc( FT_Memory  memory,
                        FT_Long    current,
                        FT_Long    size,
                        void**     P );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Free                                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Releases a given block of memory allocated through FT_Alloc().     */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory :: A handle to a given `memory object' where allocation     */
  /*              occured.                                                 */
  /*                                                                       */
  /*    P      :: This is the _address_ of a _pointer_ which points to the */
  /*              allocated block.  It is always set to NULL on exit.      */
  /*                                                                       */
  /* <Note>                                                                */
  /*    If P or *P are NULL, this function should return successfully.     */
  /*    This is a strong convention within all of FreeType and its         */
  /*    drivers.                                                           */
  /*                                                                       */
  BASE_DEF
  void  FT_Free( FT_Memory  memory,
                 void**     P );



  /* This include is needed by the MEM_xxx() macros, it should be */
  /* available on every platform we know !!                       */
#include <string.h>

#define MEM_Set( dest, byte, count )  memset( dest, byte, count )

#ifdef HAVE_MEMCPY
#define MEM_Copy( dest, source, count )  memcpy( dest, source, count )
#else
#define MEM_Copy( dest, source, count )  bcopy( source, dest, count )
#endif

#define MEM_Move( dest, source, count )  memmove( dest, source, count )


  /*************************************************************************/
  /*                                                                       */
  /* We now support closures to produce completely reentrant code.  This   */
  /* means the allocation functions now takes an additional argument       */
  /* (`memory').  It is a handle to a given memory object, responsible for */
  /* all low-level operations, including memory management and             */
  /* synchronisation.                                                      */
  /*                                                                       */
  /* In order to keep our code readable and use the same macros in the     */
  /* font drivers and the rest of the library, MEM_Alloc(), ALLOC(), and   */
  /* ALLOC_ARRAY() now use an implicit variable, `memory'.  It must be     */
  /* defined at all locations where a memory operation is queried.         */
  /*                                                                       */

  /*                                                                       */
  /* Note that ALL memory allocation functions need an IMPLICIT argument   */
  /* called `memory' to point to the current memory object.                */
  /*                                                                       */
#define MEM_Alloc( _pointer_, _size_ ) \
          FT_Alloc( memory, _size_, (void**)&(_pointer_) )

#define MEM_Realloc( _pointer_, _current_, _size_ ) \
          FT_Realloc( memory, _current_, _size_, (void**)&(_pointer_) )

#define ALLOC( _pointer_, _size_ ) \
          FT_SET_ERROR( MEM_Alloc( _pointer_, _size_ ) )

#define REALLOC( _pointer_, _current_, _size_ ) \
          FT_SET_ERROR( MEM_Realloc( _pointer_, _current_, _size_ ) )

#define ALLOC_ARRAY( _pointer_, _count_, _type_ ) \
          FT_SET_ERROR( MEM_Alloc( _pointer_, (_count_)*sizeof (_type_) ) )

#define REALLOC_ARRAY( _pointer_, _current_, _count_, _type_ ) \
          FT_SET_ERROR( MEM_Realloc( _pointer_, (_current_)*sizeof(_type_), \
                         (_count_)*sizeof(_type_) ) )

#define FREE( _pointer_ )  FT_Free( memory, (void**)&(_pointer_) )



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