From 93a552c26d2323321356ddb9cdd3400769100617 Mon Sep 17 00:00:00 2001
From: lukaslw
Date: Wed, 30 Jul 2014 19:54:39 +0200
Subject: PRINCE: Skull mini-game fix

---
 engines/prince/graphics.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'engines/prince/graphics.cpp')

diff --git a/engines/prince/graphics.cpp b/engines/prince/graphics.cpp
index 9b8c874642..195c61b5f0 100644
--- a/engines/prince/graphics.cpp
+++ b/engines/prince/graphics.cpp
@@ -230,6 +230,29 @@ void GraphicsMan::drawAsShadowDrawNode(Graphics::Surface *screen, DrawNode *draw
 	}
 }
 
+void GraphicsMan::drawBackSpriteDrawNode(Graphics::Surface *screen, DrawNode *drawNode) {
+	byte *src1 = (byte *)drawNode->s->getBasePtr(0, 0);
+	byte *dst1 = (byte *)screen->getBasePtr(drawNode->posX, drawNode->posY);
+
+	for (int y = 0; y < drawNode->s->h; y++) {
+		byte *src2 = src1;
+		byte *dst2 = dst1;
+		for (int x = 0; x < drawNode->s->w; x++, src2++, dst2++) {
+			if (*src2 != 255) {
+				 if (x + drawNode->posX < screen->w && x + drawNode->posX >= 0) {
+					 if (y + drawNode->posY < screen->h && y + drawNode->posY >= 0) {
+						 if (*dst2 == 255) {
+							 *dst2 = *src2;
+						 }
+					 }
+				 }
+			}
+		}
+		src1 += drawNode->s->pitch;
+		dst1 += screen->pitch;
+	}
+}
+
 void GraphicsMan::drawPixel(Graphics::Surface *screen, int32 posX, int32 posY) {
 	byte *dst = (byte *)screen->getBasePtr(posX, posY);
 	*dst = 255;
-- 
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