IABSD.fr/xenocara/lib/libXft/src/xftswap.c

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  Commit

• Author : matthieu
  Date : 2012-03-10 14:09:34
  Hash : b9bf44cc
  Message : update to libXft 2.3.0

• lib/libXft/src/xftswap.c

• /*
   * Copyright © 2002 Keith Packard
   *
   * Permission to use, copy, modify, distribute, and sell this software and its
   * documentation for any purpose is hereby granted without fee, provided that
   * the above copyright notice appear in all copies and that both that
   * copyright notice and this permission notice appear in supporting
   * documentation, and that the name of Keith Packard not be used in
   * advertising or publicity pertaining to distribution of the software without
   * specific, written prior permission.  Keith Packard makes no
   * representations about the suitability of this software for any purpose.  It
   * is provided "as is" without express or implied warranty.
   *
   * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
   * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
   * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
   * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
   * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
   * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
   * PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include "xftint.h"
  
  _X_HIDDEN int
  XftNativeByteOrder (void)
  {
      int	    whichbyte = 1;
  
      if (*((char *) &whichbyte))
  	return LSBFirst;
      return MSBFirst;
  }
  
  /* byte swap a 32-bit value */
  #define swapl(x, n) { \
  		 n = ((char *) (x))[0];\
  		 ((char *) (x))[0] = ((char *) (x))[3];\
  		 ((char *) (x))[3] = n;\
  		 n = ((char *) (x))[1];\
  		 ((char *) (x))[1] = ((char *) (x))[2];\
  		 ((char *) (x))[2] = n; }
  
  /* byte swap a short */
  #define swaps(x, n) { \
  		 n = ((char *) (x))[0];\
  		 ((char *) (x))[0] = ((char *) (x))[1];\
  		 ((char *) (x))[1] = n; }
  
  /* byte swap a three-byte unit */
  #define swapt(x, n) { \
  		 n = ((char *) (x))[0];\
  		 ((char *) (x))[0] = ((char *) (x))[2];\
  		 ((char *) (x))[2] = n; }
  
  _X_HIDDEN void
  XftSwapCARD32 (CARD32 *data, int u)
  {
      char    n;
      while (u--)
      {
  	swapl (data, n);
  	data++;
      }
  }
  
  _X_HIDDEN void
  XftSwapCARD24 (CARD8 *data, int width, int height)
  {
      int	    units, u;
      char    n;
      CARD8   *d;
  
      units = width / 3;
      while (height--)
      {
  	d = data;
  	data += width;
  	u = units;
  	while (u--)
  	{
  	    swapt (d, n);
  	    d += 3;
  	}
      }
  }
  
  _X_HIDDEN void
  XftSwapCARD16 (CARD16 *data, int u)
  {
      char    n;
      while (u--)
      {
  	swaps (data, n);
  	data++;
      }
  }
  
  _X_HIDDEN void
  XftSwapImage (XImage *image)
  {
      switch (image->bits_per_pixel) {
      case 32:
  	XftSwapCARD32 ((CARD32 *) image->data,
  		       image->height * image->bytes_per_line >> 2);
  	break;
      case 24:
  	XftSwapCARD24 ((CARD8 *) image->data,
  		       image->bytes_per_line,
  		       image->height);
  	break;
      case 16:
  	XftSwapCARD16 ((CARD16 *) image->data,
  		       image->height * image->bytes_per_line >> 1);
  	break;
      default:
  	break;
      }
  }