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
new file mode 100644
index 000000000..f0f2058d0
--- /dev/null
+++ b/nx-X11/lib/lbxutil/image/dpackbits.c
@@ -0,0 +1,100 @@
+/* $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);
+}