TITANIC: Implement OSVideoSurface::setupMap

2 files changed, 54 insertions, 0 deletions

diff --git a/engines/titanic/support/video_surface.cpp b/engines/titanic/support/video_surface.cpp
index ebe552a062..a1b26386b3 100644
--- a/engines/titanic/support/video_surface.cpp
+++ b/engines/titanic/support/video_surface.cpp
@@ -182,6 +182,34 @@ OSVideoSurface::OSVideoSurface(CScreenManager *screenManager, const CResourceKey
 	}
 }
 
+void OSVideoSurface::setupMap(byte map[0x400], byte val) {
+	byte *pBase = map;
+	int incr = 0;
+
+	for (uint idx1 = 0; idx1 < 32; ++idx1, pBase += 32) {
+		for (uint idx2 = 0, base = 0; idx2 < 32; ++idx2, base += incr) {
+			int64 v = 0x84210843;
+			v *= base;
+			v = ((v >> 32) + base) >> 4;
+			v += (v >> 31);
+			pBase[idx2] = v;
+
+			if (val != 0xff) {
+				v &= 0xff;
+				if (v != idx2) {
+					v = 0x80808081 * val * v * val;
+					v = (v >> 32) + incr;
+					incr = idx1;
+
+					v >>= 7;
+					v += (v >> 31);
+					pBase[idx2] = v;
+				}
+			}
+		}
+	}
+}
+
 void OSVideoSurface::loadResource(const CResourceKey &key) {
 	_resourceKey = key;
 	_pendingLoad = true;
@@ -323,6 +351,10 @@ uint16 OSVideoSurface::getPixel(const Common::Point &pt) {
 	}
 }
 
+void OSVideoSurface::changePixel(uint16 *pixelP, uint16 color, int val3, int val5) {
+	// TODO
+}
+
 void OSVideoSurface::shiftColors() {
 	if (!loadIfReady())
 		return;
diff --git a/engines/titanic/support/video_surface.h b/engines/titanic/support/video_surface.h
index da53270122..e1ddde8013 100644
--- a/engines/titanic/support/video_surface.h
+++ b/engines/titanic/support/video_surface.h
@@ -143,6 +143,11 @@ public:
 	virtual uint16 getPixel(const Common::Point &pt) = 0;
 
 	/**
+	 * Change a pixel
+	 */
+	virtual void changePixel(uint16 *pixelP, uint16 color, int val3, int val5) = 0;
+
+	/**
 	 * Shifts the colors of the surface.. maybe greys it out?
 	 */
 	virtual void shiftColors() = 0;
@@ -202,6 +207,18 @@ public:
 };
 
 class OSVideoSurface : public CVideoSurface {
+private:
+	static byte _map[0x400];
+
+	/**
+	 * Setup the color mapping table
+	 */
+	static void setupMap(byte map[0x400], byte val);
+public:
+	/**
+	 * Setup statics
+	 */
+	static void setup() { setupMap(_map, 0xff); }
 public:
 	OSVideoSurface(CScreenManager *screenManager, DirectDrawSurface *surface);
 	OSVideoSurface(CScreenManager *screenManager, const CResourceKey &key, bool flag = false);
@@ -272,6 +289,11 @@ public:
 	virtual uint16 getPixel(const Common::Point &pt);
 
 	/**
+	 * Change a pixel
+	 */
+	virtual void changePixel(uint16 *pixelP, uint16 color, int val3, int val5);
+
+	/**
 	 * Shifts the colors of the surface.. maybe greys it out?
 	 */
 	virtual void shiftColors();