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/*
* 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;
}
}
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