1 files changed, 144 insertions, 0 deletions
diff --git a/source/blender/imbuf/intern/filter.c b/source/blender/imbuf/intern/filter.c
new file mode 100644
index 00000000000..dfc6e26e68a
--- /dev/null
+++ b/source/blender/imbuf/intern/filter.c
@@ -0,0 +1,144 @@
+/**
+ *
+ * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ * filter.c
+ *
+ * $Id$
+ */
+
+#include "BLI_blenlib.h"
+
+#include "imbuf.h"
+#include "imbuf_patch.h"
+#include "IMB_imbuf_types.h"
+#include "IMB_imbuf.h"
+
+#include "IMB_filter.h"
+
+
+/************************************************************************/
+/*				FILTERS					*/
+/************************************************************************/
+
+static void filtrow(unsigned char *point, int x)
+{
+	unsigned int c1,c2,c3,error;
+
+	if (x>1){
+		c1 = c2 = *point;
+		error = 2;
+		for(x--;x>0;x--){
+			c3 = point[4];
+			c1 += (c2<<1) + c3 + error;
+			error = c1 & 3;
+			*point = c1 >> 2;
+			point += 4;
+			c1=c2;
+			c2=c3;
+		}
+		*point = (c1 + (c2<<1) + c2 + error) >> 2;
+	}
+}
+
+
+static void filtcolum(unsigned char *point, int y, int skip)
+{
+	unsigned int c1,c2,c3,error;
+	unsigned char *point2;
+
+	if (y>1){
+		c1 = c2 = *point;
+		point2 = point;
+		error = 2;
+		for(y--;y>0;y--){
+			point2 += skip;
+			c3 = *point2;
+			c1 += (c2<<1) + c3 +error;
+			error = c1 & 3;
+			*point = c1 >> 2;
+			point=point2;
+			c1=c2;
+			c2=c3;
+		}
+		*point = (c1 + (c2<<1) + c2 + error) >> 2;
+	}
+}
+
+
+void IMB_filtery(struct ImBuf *ibuf)
+{
+	unsigned char *point;
+	short x,y,skip;
+
+	point = (unsigned char *)ibuf->rect;
+	x = ibuf->x;
+	y = ibuf->y;
+	skip = x<<2;
+
+	for (;x>0;x--){
+		if (ibuf->depth > 24) filtcolum(point,y,skip);
+		point++;
+		filtcolum(point,y,skip);
+		point++;
+		filtcolum(point,y,skip);
+		point++;
+		filtcolum(point,y,skip);
+		point++;
+	}
+}
+
+
+void imb_filterx(struct ImBuf *ibuf)
+{
+	unsigned char *point;
+	short x,y,skip;
+
+	point = (unsigned char *)ibuf->rect;
+	x = ibuf->x;
+	y = ibuf->y;
+	skip = (x<<2) - 3;
+
+	for (;y>0;y--){
+		if (ibuf->depth > 24) filtrow(point,x);
+		point++;
+		filtrow(point,x);
+		point++;
+		filtrow(point,x);
+		point++;
+		filtrow(point,x);
+		point+=skip;
+	}
+}
+
+
+void IMB_filter(struct ImBuf *ibuf)
+{
+	IMB_filtery(ibuf);
+	imb_filterx(ibuf);
+}