godot/thirdparty/freetype/src/base/ftsystem.c

/****************************************************************************
 *
 * ftsystem.c
 *
 *   ANSI-specific FreeType low-level system interface (body).
 *
 * Copyright (C) 1996-2023 by
 * David Turner, Robert Wilhelm, and Werner Lemberg.
 *
 * This file is part of the FreeType project, and may only be used,
 * modified, and distributed under the terms of the FreeType project
 * license, LICENSE.TXT.  By continuing to use, modify, or distribute
 * this file you indicate that you have read the license and
 * understand and accept it fully.
 *
 */

  /**************************************************************************
   *
   * This file contains the default interface used by FreeType to access
   * low-level, i.e. memory management, i/o access as well as thread
   * synchronisation.  It can be replaced by user-specific routines if
   * necessary.
   *
   */


#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/ftsystem.h>
#include <freetype/fterrors.h>
#include <freetype/fttypes.h>


  /**************************************************************************
   *
   *                      MEMORY MANAGEMENT INTERFACE
   *
   */

  /**************************************************************************
   *
   * It is not necessary to do any error checking for the
   * allocation-related functions.  This will be done by the higher level
   * routines like ft_mem_alloc() or ft_mem_realloc().
   *
   */


  /**************************************************************************
   *
   * @Function:
   *   ft_alloc
   *
   * @Description:
   *   The memory allocation function.
   *
   * @Input:
   *   memory ::
   *     A pointer to the memory object.
   *
   *   size ::
   *     The requested size in bytes.
   *
   * @Return:
   *   The address of newly allocated block.
   */
  FT_CALLBACK_DEF( void* )
  ft_alloc( FT_Memory  memory,
            long       size )
  { … }


  /**************************************************************************
   *
   * @Function:
   *   ft_realloc
   *
   * @Description:
   *   The memory reallocation function.
   *
   * @Input:
   *   memory ::
   *     A pointer to the memory object.
   *
   *   cur_size ::
   *     The current size of the allocated memory block.
   *
   *   new_size ::
   *     The newly requested size in bytes.
   *
   *   block ::
   *     The current address of the block in memory.
   *
   * @Return:
   *   The address of the reallocated memory block.
   */
  FT_CALLBACK_DEF( void* )
  ft_realloc( FT_Memory  memory,
              long       cur_size,
              long       new_size,
              void*      block )
  { … }


  /**************************************************************************
   *
   * @Function:
   *   ft_free
   *
   * @Description:
   *   The memory release function.
   *
   * @Input:
   *   memory ::
   *     A pointer to the memory object.
   *
   *   block ::
   *     The address of block in memory to be freed.
   */
  FT_CALLBACK_DEF( void )
  ft_free( FT_Memory  memory,
           void*      block )
  { … }


  /**************************************************************************
   *
   *                    RESOURCE MANAGEMENT INTERFACE
   *
   */

#ifndef FT_CONFIG_OPTION_DISABLE_STREAM_SUPPORT

  /**************************************************************************
   *
   * The macro FT_COMPONENT is used in trace mode.  It is an implicit
   * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
   * messages during execution.
   */
#undef  FT_COMPONENT
#define FT_COMPONENT …

  /* We use the macro STREAM_FILE for convenience to extract the       */
  /* system-specific stream handle from a given FreeType stream object */
#define STREAM_FILE( stream ) …


  /**************************************************************************
   *
   * @Function:
   *   ft_ansi_stream_close
   *
   * @Description:
   *   The function to close a stream.
   *
   * @Input:
   *   stream ::
   *     A pointer to the stream object.
   */
  FT_CALLBACK_DEF( void )
  ft_ansi_stream_close( FT_Stream  stream )
  { … }


  /**************************************************************************
   *
   * @Function:
   *   ft_ansi_stream_io
   *
   * @Description:
   *   The function to open a stream.
   *
   * @Input:
   *   stream ::
   *     A pointer to the stream object.
   *
   *   offset ::
   *     The position in the data stream to start reading.
   *
   *   buffer ::
   *     The address of buffer to store the read data.
   *
   *   count ::
   *     The number of bytes to read from the stream.
   *
   * @Return:
   *   The number of bytes actually read.  If `count' is zero (that is,
   *   the function is used for seeking), a non-zero return value
   *   indicates an error.
   */
  FT_CALLBACK_DEF( unsigned long )
  ft_ansi_stream_io( FT_Stream       stream,
                     unsigned long   offset,
                     unsigned char*  buffer,
                     unsigned long   count )
  { … }


  /* documentation is in ftstream.h */

  FT_BASE_DEF( FT_Error )
  FT_Stream_Open( FT_Stream    stream,
                  const char*  filepathname )
  { … }

#endif /* !FT_CONFIG_OPTION_DISABLE_STREAM_SUPPORT */

#ifdef FT_DEBUG_MEMORY

  extern FT_Int
  ft_mem_debug_init( FT_Memory  memory );

  extern void
  ft_mem_debug_done( FT_Memory  memory );

#endif


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( FT_Memory )
  FT_New_Memory( void )
  { … }


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( void )
  FT_Done_Memory( FT_Memory  memory )
  { … }


/* END */