--- nono/lib/bitmap.cpp	2026/04/29 17:05:47	1.1.1.7
+++ nono/lib/bitmap.cpp	2026/04/29 17:05:56	1.1.1.8
@@ -668,7 +668,7 @@ BitmapRGBX::DrawBitmapNtoNm1(const Rect&
 			const uint32 *s0 = (const uint32 *)src.GetPtr(sx, sy);
 			for (uint ty = 0; ty < N1; ty++) {
 				const uint32 *s1 = s0 + stride32;
-				uint32 *d = (uint32 *)GetPtr(dx, dy + ty);
+				uint32 *d = (uint32 *)GetPtr(dr.x + dx, dr.y + dy + ty);
 				for (uint tx = 0; tx < N1; tx++) {
 					uint a00 = A(N2 - ty, N2 - tx);
 					uint a01 = A(N2 - ty,      tx);
@@ -734,7 +734,7 @@ BitmapRGBX::DrawBitmapNm1toN(const Rect&
 	for (uint sy = 0, dy = 0; dy < dr.h; sy += N1, dy += N) {
 		for (uint sx = 0, dx = 0; dx < dr.w; sx += N1, dx += N) {
 			const uint32 *s0i = (const uint32 *)src.GetPtr(sx, sy);
-			uint32 *d = (uint32 *)GetPtr(dx, dy);
+			uint32 *d = (uint32 *)GetPtr(dr.x + dx, dr.y + dy);
 			for (uint ty = 0; ty < N; ty++) {
 				const uint32 *s1 = (const uint32 *)(s0i + ty * sstride32);
 				const uint32 *s0 = (const uint32 *)(s1 - sstride32);
@@ -797,7 +797,7 @@ BitmapRGBX::DrawBitmapMean(const Rect& d
 	RectF sr(0, 0, tx, ty);
 
 	for (uint y = 0; y < dr.h; y++) {
-		uint32 *d = (uint32 *)GetRowPtr(y);
+		uint32 *d = (uint32 *)GetPtr(dr.x, dr.y + y);
 		sr.x = 0;
 		for (uint x = 0; x < dr.w; x++) {
 			Color c = src.Mean(sr);