M src/gba/renderers/software-bg.c → src/gba/renderers/software-bg.c

@@ -41,10 +41,12 @@ for (outX = renderer->start, pixel = &renderer->row[outX]; outX < renderer->end; ++outX, ++pixel) { \
 		x += background->dx; \
 		y += background->dy; \
 		\
-		MOSAIC(COORD) \
-		\
 		uint32_t current = *pixel; \
-		if (pixelData && IS_WRITABLE(current)) {	\
+		if (!IS_WRITABLE(current)) { \
+			continue; \
+		} \
+		MOSAIC(COORD) \
+		if (pixelData) { \
 			COMPOSITE_256_ ## OBJWIN (BLEND); \
 		} \
 	}

M src/gba/renderers/video-software.c → src/gba/renderers/video-software.c

@@ -517,6 +517,12 @@ } else {
 			backdrop |= softwareRenderer->variantPalette[0];
 		}
 		int end = softwareRenderer->windows[w].endX;
+		for (; x < end - 3; x += 4) {
+			softwareRenderer->row[x] = backdrop;
+			softwareRenderer->row[x + 1] = backdrop;
+			softwareRenderer->row[x + 2] = backdrop;
+			softwareRenderer->row[x + 3] = backdrop;
+		}
 		for (; x < end; ++x) {
 			softwareRenderer->row[x] = backdrop;
 		}