1 files changed, 118 insertions, 0 deletions
diff --git a/graphics/screen.h b/graphics/screen.h
new file mode 100644
index 0000000000..b3bb2d3eb2
--- /dev/null
+++ b/graphics/screen.h
@@ -0,0 +1,118 @@
+/* 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 GRAPHICS_SCREEN_H
+#define GRAPHICS_SCREEN_H
+
+#include "graphics/managed_surface.h"
+#include "graphics/pixelformat.h"
+#include "common/list.h"
+#include "common/rect.h"
+
+namespace Graphics {
+
+#define PALETTE_COUNT 256
+#define PALETTE_SIZE (256 * 3)
+
+/**
+ * Implements a specialised surface that represents the screen.
+ * It keeps track of any areas of itself that are updated by drawing
+ * calls, and provides an update that method that blits the affected 
+ * areas to the physical screen
+ */
+class Screen : public ManagedSurface {
+private:
+	/**
+	 * List of affected areas of the screen
+	 */
+	Common::List<Common::Rect> _dirtyRects;
+private:
+	/**
+	* Merges together overlapping dirty areas of the screen
+	*/
+	void mergeDirtyRects();
+
+	/**
+	* Returns the union of two dirty area rectangles
+	*/
+	bool unionRectangle(Common::Rect &destRect, const Common::Rect &src1, const Common::Rect &src2);
+protected:
+	/**
+	 * Adds a rectangle to the list of modified areas of the screen during the
+	 * current frame
+	 */
+	virtual void addDirtyRect(const Common::Rect &r);
+public:
+	Screen();
+	Screen(int width, int height);
+	Screen(int width, int height, PixelFormat pixelFormat);
+
+	/**
+	 * Returns true if there are any pending screen updates (dirty areas)
+	 */
+	bool isDirty() const { return !_dirtyRects.empty(); }
+
+	/**
+	 * Marks the whole screen as dirty. This forces the next call to update 
+	 * to copy the entire screen contents
+	 */
+	void makeAllDirty();
+
+	/**
+	 * Clear the current dirty rects list
+	 */
+	virtual void clearDirtyRects() { _dirtyRects.clear(); }
+
+	/**
+	 * Updates the screen by copying any affected areas to the system
+	 */
+	virtual void update();
+
+	/**
+	 * Return the currently active palette
+	 */
+	void getPalette(byte palette[PALETTE_SIZE]);
+
+	/**
+	 * Return a portion of the currently active palette
+	 */
+	void getPalette(byte *palette, uint start, uint num);
+
+	/**
+	 * Set the palette
+	 */
+	void setPalette(const byte palette[PALETTE_SIZE]);
+
+	/**
+	 * Set a subsection of the palette
+	 */
+	void setPalette(const byte *palette, uint start, uint num);
+
+	/**
+	 * Clears the current palette, setting all entries to black
+	 */
+	void clearPalette();
+};
+
+} // End of namespace Graphics
+
+#endif