Fix BC6 block decoder

python-pillow · Jul 17, 2022 · f6bf186 · f6bf186
1 parent 2258f23
commit f6bf186
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/libImaging/BcnDecode.c b/src/libImaging/BcnDecode.c
@@ -751,7 +751,9 @@ decode_bc6_block(rgb32f *col, const UINT8 *src, int sign) {
     }
     if (info->tr) { /* apply deltas */
         for (i = 3; i < numep; i++) {
-            endpoints[i] = (endpoints[i] + endpoints[0]) & mask;
+            endpoints[i + 0] = (endpoints[i + 0] + endpoints[0]) & mask;
+            endpoints[i + 1] = (endpoints[i + 1] + endpoints[1]) & mask;
+            endpoints[i + 2] = (endpoints[i + 2] + endpoints[2]) & mask;
         }
         if (sign) {
             for (i = 3; i < numep; i += 3) {