SCI32: Improve kPlayVMD rendering

1. Added a new game option for linear interpolation when scaling
   overlay-mode video in ScummVM builds with USE_RGB_COLOR;
2. Implemented SCI2.1-variant of the VMD player renderer (fixes
   Trac#9857), which bypasses the engine's normal rendering
   pipeline;
3. Improved accuracy of the SCI3-variant of the VMD player by
   writing HunkPalettes into the VMD's CelObjMem instead of
   submitting palettes directly to GfxPalette32.

1 files changed, 13 insertions, 0 deletions

diff --git a/engines/sci/graphics/frameout.h b/engines/sci/graphics/frameout.h
index 4bdb172e5e..26732d5c01 100644
--- a/engines/sci/graphics/frameout.h
+++ b/engines/sci/graphics/frameout.h
@@ -340,6 +340,19 @@ public:
 	void palMorphFrameOut(const int8 *styleRanges, PlaneShowStyle *showStyle);
 
 	/**
+	 * Draws the given rect from the internal screen buffer to hardware without
+	 * processing any other graphics updates except for cursor changes.
+	 */
+	void directFrameOut(const Common::Rect &showRect);
+
+#ifdef USE_RGB_COLOR
+	/**
+	 * Sends the entire internal screen buffer and palette to hardware.
+	 */
+	void resetHardware();
+#endif
+
+	/**
 	 * Modifies the raw pixel data for the next frame with
 	 * new palette indexes based on matched style ranges.
 	 */