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