PRINCE: showSprite and drawTransparent update

1 files changed, 8 insertions, 4 deletions

diff --git a/engines/prince/graphics.cpp b/engines/prince/graphics.cpp
index 5b66994b47..551ae70a34 100644
--- a/engines/prince/graphics.cpp
+++ b/engines/prince/graphics.cpp
@@ -73,12 +73,16 @@ void GraphicsMan::draw(uint16 posX, uint16 posY, const Graphics::Surface *s) {
 	change();
 }
 
-void GraphicsMan::drawTransparent(uint16 posX, uint16 posY, const Graphics::Surface *s) {
-	for (uint y = 0; y < s->h; ++y) {
-		for (uint x = 0; x < s->w; ++x) {
+void GraphicsMan::drawTransparent(int32 posX, int32 posY, const Graphics::Surface *s) {
+	for (int y = 0; y < s->h; y++) {
+		for (int x = 0; x < s->w; x++) {
 			byte pixel = *((byte*)s->getBasePtr(x, y));
 			if (pixel != 255) {
-				*((byte*)_frontScreen->getBasePtr(x + posX, y + posY)) = pixel;
+				if (x + posX < _frontScreen->w && x + posX >= 0) {
+					if (y + posY < _frontScreen->h && y + posY >= 0) {
+						*((byte*)_frontScreen->getBasePtr(x + posX, y + posY)) = pixel;
+					}
+				}
 			}
 		}
 	}