MOHAWK: Rework Myst GFX updates

- Initial card state is drawn to the back buffer
- Script driven updates are drawn to the front buffer
Allows opcode 28 (copy back buffer to screen) and opcodes 29/33 (copy image to screen / back buffer) to work properly.
Fixes among others the generator room lights, and the matchbox.

svn-id: r54907

1 files changed, 1 insertions, 2 deletions

diff --git a/engines/mohawk/myst_areas.h b/engines/mohawk/myst_areas.h
index 81fbb0e216..c65c91ba55 100644
--- a/engines/mohawk/myst_areas.h
+++ b/engines/mohawk/myst_areas.h
@@ -203,17 +203,16 @@ public:
 	MystResourceType10(MohawkEngine_Myst *vm, Common::SeekableReadStream *rlstStream, MystResource *parent);
 	virtual ~MystResourceType10();
 
-	void drawDataToScreen();
 	void handleMouseDown(const Common::Point &mousee);
 	void handleMouseUp(const Common::Point &mouse);
 	void handleMouseDrag(const Common::Point &mouse);
 	void setStep(uint16 step);
 	void setPosition(uint16 pos);
+    void restoreBackground();
 
 protected:
 	Common::Rect boundingBox();
 	void updatePosition(const Common::Point &mouse);
-    void restoreBackground();
 
 	uint16 _dragSound;
 	uint16 _sliderWidth;