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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef ZVISION_RENDER_MANAGER_H
+#define ZVISION_RENDER_MANAGER_H
+
+#include "common/types.h"
+#include "common/rect.h"
+
+#include "graphics/surface.h"
+
+#include "zvision/render_table.h"
+
+class OSystem;
+
+namespace Common {
+class String;
+class SeekableReadStream;
+}
+
+namespace Video {
+class VideoDecoder;
+}
+
+namespace ZVision {
+
+class RenderManager {
+public:
+	RenderManager(OSystem *system, const Common::Rect workingWindow, const Graphics::PixelFormat pixelFormat);
+	~RenderManager();
+
+private:
+	OSystem *_system;
+	const Graphics::PixelFormat _pixelFormat;
+
+	// A buffer the exact same size as the workingWindow
+	// It's used for panorama/tilt warping and for clearing the workingWindow to a single color
+	uint16 *_workingWindowBuffer;
+
+	/** Width of the working window. Saved to prevent extraneous calls to _workingWindow.width() */
+	const int _workingWidth;
+	/** Height of the working window. Saved to prevent extraneous calls to _workingWindow.height() */
+	const int _workingHeight;
+	/** Center of the screen in the x direction */
+	const int _screenCenterX;
+	/** Center of the screen in the y direction */
+	const int _screenCenterY;
+
+	/** 
+	 * A Rectangle centered inside the actual window. All in-game coordinates
+	 * are given in this coordinate space. Also, all images are clipped to the
+	 * edges of this Rectangle
+	 */
+	const Common::Rect _workingWindow;
+	/** Used to warp the background image */
+	RenderTable _renderTable;
+
+	Graphics::Surface _currentBackground;
+	/** The (x1,y1) coordinates of the subRectangle of the background that is currently displayed on the screen */
+	Common::Point _backgroundOffset;
+	/** The width of the current background image */
+	uint16 _backgroundWidth;
+	/** The height of the current background image */
+	uint16 _backgroundHeight;
+
+	/** 
+	 * The "velocity" at which the background image is panning. We actually store the inverse of velocity (ms/pixel instead of pixels/ms)
+	 * because it allows you to accumulate whole pixels 'steps' instead of rounding pixels every frame
+	 */
+	int _backgroundInverseVelocity;
+	/** Holds any 'leftover' milliseconds between frames */
+	uint _accumulatedVelocityMilliseconds;
+
+	// TODO: Potentially merge this buffer and _workingWindowBuffer
+	byte *_scaledVideoFrameBuffer;
+
+public:
+	void initialize();
+	/**
+	 * Rotates the background image in accordance to the current _backgroundInverseVelocity
+	 *
+	 * @param deltaTimeInMillis    The amount of time that has passed since the last frame
+	 */
+	void update(uint deltaTimeInMillis);
+
+	/**
+	 * Fills the entire workingWindow with the specified color
+	 *
+	 * @param color    The color to fill the working window with. (In RGB 555)
+	 */
+	void clearWorkingWindowToColor(uint16 color);
+
+	/**
+	 * Blits the image or a portion of the image to the backbuffer. Actual screen updates won't happen until the end of the frame.
+	 * The image will be clipped to fit inside the working window. Coords are in working window space, not screen space!
+	 *
+	 * @param fileName        Name of the image file
+	 * @param destinationX    X position where the image should be put. Coords are in working window space, not screen space!
+	 * @param destinationY    Y position where the image should be put. Coords are in working window space, not screen space!
+	 */
+	void renderImageToScreen(const Common::String &fileName, int16 destinationX, int16 destinationY, bool wrap = false);
+
+	/**
+	 * Blits the image or a portion of the image to the backbuffer. Actual screen updates won't happen until the end of the frame.
+	 * The image will be clipped to fit inside the working window. Coords are in working window space, not screen space!
+	 *
+	 * @param stream          Surface to read the image data from
+	 * @param destinationX    X position where the image should be put. Coords are in working window space, not screen space!
+	 * @param destinationY    Y position where the image should be put. Coords are in working window space, not screen space!
+	 */
+	void renderImageToScreen(Graphics::Surface &surface, int16 destinationX, int16 destinationY, bool wrap = false);
+
+	/**
+	 * Sets the current background image to be used by the RenderManager and immediately
+	 * blits it to the screen. (It won't show up until the end of the frame)
+	 *
+	 * @param fileName    The name of the image file
+	 */
+	void setBackgroundImage(const Common::String &fileName);
+
+	/**
+	 * Set the background position (_backgroundOffset). If the current RenderState is PANORAMA, the offset
+	 * will be in the horizontal direction. If the current RenderState is TILT, the offset will be in the
+	 * vertical direction. 
+	 *
+	 * This method will not render anything on the screen. So if nothing else is called that renders the 
+	 * background, the change won't be seen until next frame.
+	 *
+	 * @param offset The amount to offset the background
+	 */
+	void setBackgroundPosition(int offset);
+	
+	/**
+	 * Set the background scroll velocity. Negative velocities correspond to left / up scrolling and 
+	 * positive velocities correspond to right / down scrolling
+	 *
+	 * @param velocity    Velocity
+	 */
+	void setBackgroundVelocity(int velocity);
+
+	/**
+	 * Converts a point in screen coordinate space to image coordinate space
+	 *
+	 * @param point    Point in screen coordinate space
+	 * @return         Point in image coordinate space
+	 */
+	const Common::Point screenSpaceToImageSpace(const Common::Point &point);
+
+	RenderTable *getRenderTable();
+	uint32 getCurrentBackgroundOffset();
+
+private:
+	/**
+	 * Renders a subRectangle of an image to the backbuffer. The destinationRect and SubRect
+	 * will be clipped to image bound and to working window bounds
+	 *
+	 * @param buffer             Pointer to (0, 0) of the image data
+	 * @param imageWidth         The width of the original image (not of the subRectangle)
+	 * @param imageHeight        The width of the original image (not of the subRectangle)
+	 * @param horizontalPitch    The horizontal pitch of the original image
+	 * @param destinationX       The x coordinate (in working window space) of where to put the final image
+	 * @param destinationY       The y coordinate (in working window space) of where to put the final image
+	 * @param subRectangle       A rectangle representing the part of the image that should be rendered
+	 * @param wrap               Should the image wrap (tile) if it doesn't completely fill the screen?
+	 */
+	void renderSubRectToScreen(Graphics::Surface &surface, int16 destinationX, int16 destinationY, bool wrap);
+
+	void readImageToSurface(const Common::String &fileName, Graphics::Surface &destination);
+
+	void moveBackground(int offset);
+};
+
+} // End of namespace ZVision
+
+#endif