Added UtilityBitmap class for general-purpose bitmaps in the server

Implemented  blit methods in ViewDriver - doesn't quite work yet :(
Implmemented cursor methods in DisplayDriver - doesn't quite work yet, but wil be fixed later
Color tweak to DefaultDecorator


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@6520 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/server/ServerBitmap.cpp

@@ -89,7 +89,7 @@ ServerBitmap::~ServerBitmap(void)
 	\brief Gets the number of bytes occupied by the bitmap, including padding bytes.
 	\return The number of bytes occupied by the bitmap, including padding.
 */
-uint32 ServerBitmap::BitsLength(void)
+uint32 ServerBitmap::BitsLength(void) const
 {
 	return (uint32)(_bytesperrow*_height);
 }
@@ -250,3 +250,23 @@ void ServerBitmap::_HandleSpace(color_space space, int32 bytesperline)
 			break;
 	}
 }
+
+UtilityBitmap::UtilityBitmap(BRect rect,color_space space, int32 flags,
+	int32 bytesperline, screen_id screen)
+: ServerBitmap(rect,space,flags,bytesperline,screen)
+{
+	_AllocateBuffer();
+}
+
+UtilityBitmap::UtilityBitmap(const ServerBitmap *bmp)
+: ServerBitmap(bmp)
+{
+	_AllocateBuffer();
+	if(bmp->Bits())
+		memcpy(Bits(),bmp->Bits(),bmp->BitsLength());
+}
+
+UtilityBitmap::~UtilityBitmap(void)
+{
+	_FreeBuffer();
+}