GBA Video: Fix sprite mosaic clamping (fixes #1008)

CHANGES

@@ -25,6 +25,7 @@ Emulation fixes:
  - GBA Memory: Fix writing to OBJ memory in modes 3 and 5
  - GBA: Fix RTC on non-standard sized ROMs (fixes mgba.io/i/1400)
  - GBA Memory: Prevent writing to mirrored BG VRAM (fixes mgba.io/i/743)
+ - GBA Video: Fix sprite mosaic clamping (fixes mgba.io/i/1008)
 Other fixes:
  - Qt: More app metadata fixes
  - Qt: Fix load recent from archive (fixes mgba.io/i/1325)

src/gba/renderers/software-obj.c

@@ -17,19 +17,12 @@
 #define SPRITE_MOSAIC_LOOP(DEPTH, TYPE) \
 	SPRITE_YBASE_ ## DEPTH(inY); \
 	unsigned tileData; \
-	if (outX % mosaicH) { \
-		if (!inX && xOffset > 0) { \
-			inX = mosaicH - (outX % mosaicH); \
-			outX += mosaicH - (outX % mosaicH); \
-		} else if (inX == width - xOffset) { \
-			inX = mosaicH + (outX % mosaicH); \
-			outX += mosaicH - (outX % mosaicH); \
-		} \
-	} \
 	for (; outX < condition; ++outX, inX += xOffset) { \
 		int localX = inX - xOffset * (outX % mosaicH); \
-		if (localX < 0 || localX > width - 1) { \
-			continue; \
+		if (localX < 0) { \
+			localX = 0; \
+		} else if (localX > width - 1) {\
+			localX = width - 1; \
 		} \
 		SPRITE_XBASE_ ## DEPTH(localX); \
 		SPRITE_DRAW_PIXEL_ ## DEPTH ## _ ## TYPE(localX); \

src/gba/renderers/video-software.c

@@ -805,11 +805,17 @@ static void _drawScanline(struct GBAVideoSoftwareRenderer* renderer, int y) {
 			struct GBAVideoRendererSprite* sprite = &renderer->sprites[i];
 			int localY = y;
 			renderer->end = 0;
+			if ((y < sprite->y && (sprite->endY - 256 < 0 || y >= sprite->endY - 256)) || y >= sprite->endY) {
+				continue;
+			}
 			if (GBAObjAttributesAIsMosaic(sprite->obj.a)) {
 				localY = mosaicY;
-			}
-			if ((localY < sprite->y && (sprite->endY - 256 < 0 || localY >= sprite->endY - 256)) || localY >= sprite->endY) {
-				continue;
+				if (localY < sprite->y) {
+					localY = sprite->y;
+				}
+				if (localY >= sprite->endY) {
+					localY = sprite->endY - 1;
+				}
 			}
 			for (w = 0; w < renderer->nWindows; ++w) {
 				if (renderer->spriteCyclesRemaining <= 0) {