TITANIC: Fix transparency handling for PET glyph selection

4 files changed, 20 insertions, 13 deletions

diff --git a/engines/titanic/support/mouse_cursor.cpp b/engines/titanic/support/mouse_cursor.cpp
index e9381ddb80..6300f65a3b 100644
--- a/engines/titanic/support/mouse_cursor.cpp
+++ b/engines/titanic/support/mouse_cursor.cpp
@@ -136,7 +136,7 @@ void CMouseCursor::setCursor(CursorId cursorId) {
 
 		Graphics::ManagedSurface surface(CURSOR_SIZE, CURSOR_SIZE, g_system->getScreenFormat());
 		const uint16 *srcP = srcSurface.getPixels();
-		CTransparencySurface transSurface(&ce._transSurface->rawSurface(), TRANS_DEFAULT);
+		CTransparencySurface transSurface(&ce._transSurface->rawSurface(), TRANS_ALPHA0);
 		uint16 *destP = (uint16 *)surface.getPixels();
 
 		for (int y = 0; y < CURSOR_SIZE; ++y) {
diff --git a/engines/titanic/support/transparency_surface.cpp b/engines/titanic/support/transparency_surface.cpp
index eb3fc28b52..8b5cbecc5f 100644
--- a/engines/titanic/support/transparency_surface.cpp
+++ b/engines/titanic/support/transparency_surface.cpp
@@ -66,8 +66,17 @@ int CTransparencySurface::moveX() {
 }
 
 uint CTransparencySurface::getPixel() const {
-	const byte *pixelP = (const byte *)_surface->getBasePtr(_pos.x, _pos.y);
-	return *pixelP;
+	byte pixel = *(const byte *)_surface->getBasePtr(_pos.x, _pos.y);
+	return pixel;
+}
+
+uint CTransparencySurface::getAlpha() const {
+	byte pixel = getPixel();
+	return _flag1 ? 0xFF - pixel : pixel;
+}
+
+bool CTransparencySurface::isPixelTransparent() {
+	return getAlpha() == 0xff;
 }
 
 } // End of namespace Titanic
diff --git a/engines/titanic/support/transparency_surface.h b/engines/titanic/support/transparency_surface.h
index 0391b6d5b7..1b4587a9db 100644
--- a/engines/titanic/support/transparency_surface.h
+++ b/engines/titanic/support/transparency_surface.h
@@ -42,6 +42,11 @@ private:
 	bool _flag;
 	bool _flag1;
 	bool _flag2;
+private:
+	/**
+	* Returns a a pixel from the transparency surface
+	*/
+	uint getPixel() const;
 public:
 	/**
 	 * Constructor
@@ -64,19 +69,14 @@ public:
 	int moveX();
 
 	/**
-	 * Returns a byte from the transparency surface
-	 */
-	uint getPixel() const;
-
-	/**
 	 * Returns the alpha value for the pixel (0-31)
 	 */
-	uint getAlpha() const { return 31 - (getPixel() >> 3); }
+	uint getAlpha() const;
 
 	/**
 	 * Returns true if the pixel is completely transparent
 	 */
-	bool isPixelTransparent() const { return getAlpha() == 31; }
+	bool isPixelTransparent();
 };
 
 } // End of namespace Titanic
diff --git a/engines/titanic/support/video_surface.cpp b/engines/titanic/support/video_surface.cpp
index 293232860c..52610379b5 100644
--- a/engines/titanic/support/video_surface.cpp
+++ b/engines/titanic/support/video_surface.cpp
@@ -246,9 +246,7 @@ void CVideoSurface::transBlitRect(const Rect &srcRect, const Rect &destRect, CVi
 				transSurface.setCol(srcRect.left);
 
 				for (int srcX = srcRect.left; srcX < srcRect.right; ++srcX) {
-					if (!transSurface.isPixelTransparent()) {
-						copyPixel(lineDestP, lineSrcP, transSurface.getAlpha(), srcSurface->format, isAlpha);
-					}
+					copyPixel(lineDestP, lineSrcP, transSurface.getAlpha() >> 3, srcSurface->format, isAlpha);
 
 					++lineSrcP;
 					++lineDestP;