PEGASUS: Implement the ScreenDimmer class

4 files changed, 58 insertions, 0 deletions

diff --git a/engines/pegasus/elements.cpp b/engines/pegasus/elements.cpp
index 4fe449d69e..bd3b4db2cb 100644
--- a/engines/pegasus/elements.cpp
+++ b/engines/pegasus/elements.cpp
@@ -478,4 +478,50 @@ void SpriteSequence::newFrame(const uint16 frame) {
 	_sprite.setCurrentFrameIndex(frame);
 }
 
+#define DRAW_PIXEL() \
+	if (bytesPerPixel == 2) \
+		*((uint16 *)dst) = black; \
+	else \
+		*((uint32 *)dst) = black; \
+	dst += bytesPerPixel
+
+#define SKIP_PIXEL() \
+	dst += bytesPerPixel
+
+void ScreenDimmer::draw(const Common::Rect &r) {
+	// We're going to emulate QuickDraw's srcOr+gray mode here
+	// In this mode, every other y column is all black (odd-columns).
+	// Basically, every row does three black and then one transparent
+	// repeatedly.
+
+	// The output is identical to the original
+
+	uint32 black = g_system->getScreenFormat().RGBToColor(0, 0, 0);
+	Graphics::Surface *screen = ((PegasusEngine *)g_engine)->_gfx->getWorkArea();
+	byte bytesPerPixel = g_system->getScreenFormat().bytesPerPixel;
+
+	// We're currently doing it to the whole screen to simplify the code
+
+	for (int y = 0; y < 480; y++) {
+		byte *dst = (byte *)screen->getBasePtr(0, y);
+
+		for (int x = 0; x < 640; x += 4) {
+			if (y & 1) {
+				DRAW_PIXEL();
+				DRAW_PIXEL();
+				SKIP_PIXEL();
+				DRAW_PIXEL();
+			} else {
+				SKIP_PIXEL();
+				DRAW_PIXEL();
+				DRAW_PIXEL();
+				DRAW_PIXEL();
+			}
+		}
+	}
+}
+
+#undef DRAW_PIXEL
+#undef SKIP_PIXEL
+
 } // End of namespace Pegasus
diff --git a/engines/pegasus/elements.h b/engines/pegasus/elements.h
index f806f26a17..84c390aa02 100644
--- a/engines/pegasus/elements.h
+++ b/engines/pegasus/elements.h
@@ -224,6 +224,14 @@ protected:
 	Sprite _sprite;
 };
 
+class ScreenDimmer : public DisplayElement {
+public:
+	ScreenDimmer() : DisplayElement(kScreenDimmerID) {}
+	virtual ~ScreenDimmer() {}
+
+	virtual void draw(const Common::Rect &);
+};
+
 } // End of namespace Pegasus
 
 #endif
diff --git a/engines/pegasus/pegasus.cpp b/engines/pegasus/pegasus.cpp
index ddc13d7a34..6af7f083af 100644
--- a/engines/pegasus/pegasus.cpp
+++ b/engines/pegasus/pegasus.cpp
@@ -142,6 +142,9 @@ Common::Error PegasusEngine::run() {
 	_returnHotspot.setHotspotFlags(kInfoReturnSpotFlag);
 	g_allHotspots.push_back(&_returnHotspot);
 
+	_screenDimmer.setBounds(Common::Rect(0, 0, 640, 480));
+	_screenDimmer.setDisplayOrder(kScreenDimmerOrder);
+
 	while (!shouldQuit())
 		processShell();
 
diff --git a/engines/pegasus/pegasus.h b/engines/pegasus/pegasus.h
index 8405a51dc1..c0a7d02631 100644
--- a/engines/pegasus/pegasus.h
+++ b/engines/pegasus/pegasus.h
@@ -232,6 +232,7 @@ private:
 	GameMenu *_gameMenu;
 	void doGameMenuCommand(const tGameMenuCommand);
 	void doInterfaceOverview();
+	ScreenDimmer _screenDimmer;
 
 	// Energy
 	int32 _savedEnergyValue;