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-rw-r--r--libXft/src/xftswap.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/libXft/src/xftswap.c b/libXft/src/xftswap.c
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+++ b/libXft/src/xftswap.c
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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;
+ }
+}