1 files changed, 42 insertions, 0 deletions
diff --git a/Imaging/libImaging/Negative.c b/Imaging/libImaging/Negative.c
new file mode 100644
index 0000000..1255525
--- /dev/null
+++ b/Imaging/libImaging/Negative.c
@@ -0,0 +1,42 @@
+/*
+ * The Python Imaging Library
+ * $Id: Negative.c 2134 2004-10-06 08:55:20Z fredrik $
+ *
+ * negate image
+ *
+ * to do:
+ *      FIXME: Maybe this should be implemented using ImagingPoint()
+ *
+ * history:
+ *	95-11-27 fl:	Created
+ *
+ * Copyright (c) Fredrik Lundh 1995.
+ * Copyright (c) Secret Labs AB 1997.
+ *
+ * See the README file for information on usage and redistribution.
+ */
+
+
+#include "Imaging.h"
+
+
+Imaging
+ImagingNegative(Imaging im)
+{
+    Imaging imOut;
+    int x, y;
+
+    if (!im)
+	return (Imaging) ImagingError_ModeError();
+
+    imOut = ImagingNew(im->mode, im->xsize, im->ysize);
+    if (!imOut)
+	return NULL;
+
+    for (y = 0; y < im->ysize; y++)
+	for (x = 0; x < im->linesize; x++)
+	     imOut->image[y][x] = ~im->image[y][x];
+
+    return imOut;
+}
+