From 5b6763fec319794dc55d3d6b7abeae5d6d355782 Mon Sep 17 00:00:00 2001
From: Brecht Van Lommel <brechtvanlommel@pandora.be>
Date: Wed, 26 Mar 2008 22:14:40 +0000
Subject: Fix for bug #8595: texture mipmaps with gauss filter didn't work
 correct, gave black borders.

---
 source/blender/imbuf/intern/filter.c | 49 ++++++++++++++++++++++++------------
 1 file changed, 33 insertions(+), 16 deletions(-)

(limited to 'source/blender/imbuf/intern/filter.c')

diff --git a/source/blender/imbuf/intern/filter.c b/source/blender/imbuf/intern/filter.c
index 1be5cf99e19..2835a587136 100644
--- a/source/blender/imbuf/intern/filter.c
+++ b/source/blender/imbuf/intern/filter.c
@@ -206,29 +206,46 @@ void imb_filterx(struct ImBuf *ibuf)
 void IMB_filterN(ImBuf *out, ImBuf *in)
 {
 	register char *row1, *row2, *row3;
-	register char *cp;
+	register char *cp, *r11, *r13, *r21, *r23, *r31, *r33;
 	int rowlen, x, y;
 	
 	rowlen= in->x;
 	
-	for(y=2; y<in->y; y++) {
+	for(y=0; y<in->y; y++) {
 		/* setup rows */
-		row1= (char *)(in->rect + (y-2)*rowlen);
-		row2= row1 + 4*rowlen;
-		row3= row2 + 4*rowlen;
+		row2= (char*)(in->rect + y*rowlen);
+		row1= (y == 0)? row2: row2 - 4*rowlen;
+		row3= (y == in->y-1)? row2: row2 + 4*rowlen;
 		
-		cp= (char *)(out->rect + (y-1)*rowlen);
-		cp[0]= row2[0];
-		cp[1]= row2[1];
-		cp[2]= row2[2];
-		cp[3]= row2[3];
-		cp+= 4;
+		cp= (char *)(out->rect + y*rowlen);
 		
-		for(x=2; x<rowlen; x++) {
-			cp[0]= (row1[0] + 2*row1[4] + row1[8] + 2*row2[0] + 4*row2[4] + 2*row2[8] + row3[0] + 2*row3[4] + row3[8])>>4;
-			cp[1]= (row1[1] + 2*row1[5] + row1[9] + 2*row2[1] + 4*row2[5] + 2*row2[9] + row3[1] + 2*row3[5] + row3[9])>>4;
-			cp[2]= (row1[2] + 2*row1[6] + row1[10] + 2*row2[2] + 4*row2[6] + 2*row2[10] + row3[2] + 2*row3[6] + row3[10])>>4;
-			cp[3]= (row1[3] + 2*row1[7] + row1[11] + 2*row2[3] + 4*row2[7] + 2*row2[11] + row3[3] + 2*row3[7] + row3[11])>>4;
+		for(x=0; x<rowlen; x++) {
+			if(x == 0) {
+				r11 = row1;
+				r21 = row1;
+				r31 = row1;
+			}
+			else {
+				r11 = row1-4;
+				r21 = row1-4;
+				r31 = row1-4;
+			}
+
+			if(x == rowlen-1) {
+				r13 = row1;
+				r23 = row1;
+				r33 = row1;
+			}
+			else {
+				r13 = row1+4;
+				r23 = row1+4;
+				r33 = row1+4;
+			}
+
+			cp[0]= (r11[0] + 2*row1[0] + r13[0] + 2*r21[0] + 4*row2[0] + 2*r23[0] + r31[0] + 2*row3[0] + r33[0])>>4;
+			cp[1]= (r11[1] + 2*row1[1] + r13[1] + 2*r21[1] + 4*row2[1] + 2*r23[1] + r31[1] + 2*row3[1] + r33[1])>>4;
+			cp[2]= (r11[2] + 2*row1[2] + r13[2] + 2*r21[2] + 4*row2[2] + 2*r23[2] + r31[2] + 2*row3[2] + r33[2])>>4;
+			cp[3]= (r11[3] + 2*row1[3] + r13[3] + 2*r21[3] + 4*row2[3] + 2*r23[3] + r31[3] + 2*row3[3] + r33[3])>>4;
 			cp+=4; row1+=4; row2+=4; row3+=4;
 		}
 	}
-- 
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