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authorReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
committerReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
commitf4092abdf94af6a99aff944d6264bc1284e8bdd4 (patch)
tree2ac1c9cc16ceb93edb2c4382c088dac5aeafdf0f /nx-X11/lib/lbxutil/image/dpackbits.c
parenta840692edc9c6d19cd7c057f68e39c7d95eb767d (diff)
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Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1
Summary: Imported nx-X11-3.1.0-1.tar.gz Keywords: Imported nx-X11-3.1.0-1.tar.gz into Git repository
Diffstat (limited to 'nx-X11/lib/lbxutil/image/dpackbits.c')
-rw-r--r--nx-X11/lib/lbxutil/image/dpackbits.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/nx-X11/lib/lbxutil/image/dpackbits.c b/nx-X11/lib/lbxutil/image/dpackbits.c
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+/* $Xorg: dpackbits.c,v 1.4 2000/08/17 19:46:40 cpqbld Exp $ */
+/*
+ * Copyright (c) 1988, 1989, 1990, 1991, 1992 Sam Leffler
+ * Copyright (c) 1991, 1992 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the names of
+ * Sam Leffler and Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Sam Leffler and Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+/* $XFree86: xc/lib/lbxutil/image/dpackbits.c,v 1.3 2000/05/18 23:46:16 dawes Exp $ */
+
+#include <X11/Xos.h>
+#include <X11/Xfuncproto.h>
+#include <X11/extensions/lbximage.h>
+
+/*
+ * -------------------------------------------------------------------------
+ * PackBits decoding for 8 bit color images
+ * -------------------------------------------------------------------------
+ */
+
+static void
+DecodePackBits (char **inbuf,
+ int numPixels,
+ char *outbuf)
+
+{
+ register char *inptr = *inbuf;
+ register int n, b;
+
+ while (numPixels > 0)
+ {
+ n = (int) *inptr++;
+
+ /* Watch out for compilers that don't sign extend chars... */
+
+ if (n >= 128)
+ n -= 256;
+
+ if (n < 0)
+ {
+ /* replicate next byte -n+1 times */
+
+ if (n == -128) /* nop */
+ continue;
+
+ n = -n + 1;
+ numPixels -= n;
+ for (b = *inptr++; n-- > 0;)
+ *outbuf++ = b;
+ }
+ else
+ {
+ /* copy next n+1 bytes literally */
+
+ memcpy (outbuf, inptr, ++n);
+ outbuf += n; numPixels -= n;
+ inptr += n;
+ }
+ }
+
+ *inbuf = inptr;
+}
+
+
+int
+LbxImageDecodePackBits (char *inbuf,
+ char *outbuf,
+ int num_scan_lines,
+ int scan_line_size)
+
+{
+ char *outbuf_start = outbuf;
+ int padded_scan_line_size = (scan_line_size % 4) ?
+ scan_line_size + (4 - scan_line_size % 4) : scan_line_size;
+
+ while (num_scan_lines > 0)
+ {
+ DecodePackBits (&inbuf, scan_line_size, outbuf);
+ outbuf += padded_scan_line_size;
+ num_scan_lines--;
+ }
+
+ return (outbuf - outbuf_start);
+}