MORTEVIELLE: Fix for erasing alert dialogs when done

3 files changed, 24 insertions, 0 deletions

diff --git a/engines/mortevielle/alert.cpp b/engines/mortevielle/alert.cpp
index 3895bad7fd..36a51b07ed 100644
--- a/engines/mortevielle/alert.cpp
+++ b/engines/mortevielle/alert.cpp
@@ -143,6 +143,8 @@ int do_alert(Common::String str_, int n) {
 	bool newaff, test, test1, test2, test3, dum;
 	Common::String cas;
 
+	// Make a copy of the current screen surface for later restore
+	g_vm->_backgroundSurface.copyFrom(g_vm->_screenSurface);
 
 	/*debug('** do_alert **');*/
 	memset(&limit[0][0], 0, sizeof(int) * 3 * 3);
@@ -258,6 +260,10 @@ int do_alert(Common::String str_, int n) {
 	}
 	charecr(50, succ(int, nligne) << 4);
 	show_mouse();
+
+	/* Restore the background area */
+	g_vm->_screenSurface.copyFrom(g_vm->_backgroundSurface, 0, 0);
+
 	do_alert_result = quoi;
 	return do_alert_result;
 }
diff --git a/engines/mortevielle/graphics.cpp b/engines/mortevielle/graphics.cpp
index 3683afc57b..3450d41cf5 100644
--- a/engines/mortevielle/graphics.cpp
+++ b/engines/mortevielle/graphics.cpp
@@ -935,6 +935,23 @@ void ScreenSurface::drawPicture(GfxSurface &surface, int x, int y) {
 }
 
 /**
+ * Copys a given surface to the given position
+ */
+void ScreenSurface::copyFrom(Graphics::Surface &src, int x, int y) {
+	Graphics::Surface destSurface = lockArea(Common::Rect(x, y, x + src.w, y + src.h));
+
+	// Loop through writing 
+	for (int yp = 0; yp < src.h; ++yp) {
+		if (((y + yp) < 0) || ((y + yp) >= SCREEN_HEIGHT))
+			continue;
+
+		const byte *pSrc = (const byte *)src.getBasePtr(0, yp);
+		byte *pDest = (byte *)getBasePtr(0, yp);
+		Common::copy(pSrc, pSrc + src.w, pDest);
+	}
+}
+
+/**
  * Draws a character at the specified co-ordinates
  * @remarks		Because the ScummVM surface is using a double height 640x400 surface to 
  *		simulate the original 640x400 surface, all Y values have to be doubled
diff --git a/engines/mortevielle/graphics.h b/engines/mortevielle/graphics.h
index 376b9e5e85..0b265469df 100644
--- a/engines/mortevielle/graphics.h
+++ b/engines/mortevielle/graphics.h
@@ -82,6 +82,7 @@ public:
 	Graphics::Surface lockArea(const Common::Rect &bounds);
 	void updateScreen();
 	void drawPicture(GfxSurface &surface, int x, int y);
+	void copyFrom(Graphics::Surface &src, int x, int y);
 	void writeCharacter(const Common::Point &pt, unsigned char ch, int palIndex);
 	void drawBox(int x, int y, int dx, int dy, int col);
 	void fillBox(int colour, const Common::Rect &bounds, int patt);