1 files changed, 129 insertions, 0 deletions
diff --git a/graphics/screen.cpp b/graphics/screen.cpp
new file mode 100644
index 0000000000..ccf651f536
--- /dev/null
+++ b/graphics/screen.cpp
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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.
+ *
+ */
+
+#include "common/system.h"
+#include "common/algorithm.h"
+#include "graphics/screen.h"
+#include "graphics/palette.h"
+
+namespace Graphics {
+
+Screen::Screen(): ManagedSurface() {
+	create(g_system->getWidth(), g_system->getHeight(), g_system->getScreenFormat());
+}
+
+Screen::Screen(int width, int height): ManagedSurface() {
+	create(width, height);
+}
+
+Screen::Screen(int width, int height, PixelFormat pixelFormat): ManagedSurface() {
+	create(width, height, pixelFormat);
+}
+
+void Screen::update() {
+	// Merge the dirty rects
+	mergeDirtyRects();
+
+	// Loop through copying dirty areas to the physical screen
+	Common::List<Common::Rect>::iterator i;
+	for (i = _dirtyRects.begin(); i != _dirtyRects.end(); ++i) {
+		const Common::Rect &r = *i;
+		const byte *srcP = (const byte *)getBasePtr(r.left, r.top);
+		g_system->copyRectToScreen(srcP, pitch, r.left, r.top,
+			r.width(), r.height());
+	}
+
+	// Signal the physical screen to update
+	g_system->updateScreen();
+	_dirtyRects.clear();
+}
+
+
+void Screen::addDirtyRect(const Common::Rect &r) {
+	Common::Rect bounds = r;
+	bounds.clip(getBounds());
+	bounds.translate(getOffsetFromOwner().x, getOffsetFromOwner().y);
+
+	if (bounds.width() > 0 && bounds.height() > 0)
+		_dirtyRects.push_back(bounds);
+}
+
+void Screen::makeAllDirty() {
+	addDirtyRect(Common::Rect(0, 0, this->w, this->h));
+}
+
+void Screen::mergeDirtyRects() {
+	Common::List<Common::Rect>::iterator rOuter, rInner;
+
+	// Process the dirty rect list to find any rects to merge
+	for (rOuter = _dirtyRects.begin(); rOuter != _dirtyRects.end(); ++rOuter) {
+		rInner = rOuter;
+		while (++rInner != _dirtyRects.end()) {
+
+			if ((*rOuter).intersects(*rInner)) {
+				// These two rectangles overlap, so merge them
+				unionRectangle(*rOuter, *rOuter, *rInner);
+
+				// remove the inner rect from the list
+				_dirtyRects.erase(rInner);
+
+				// move back to beginning of list
+				rInner = rOuter;
+			}
+		}
+	}
+}
+
+bool Screen::unionRectangle(Common::Rect &destRect, const Common::Rect &src1, const Common::Rect &src2) {
+	destRect = src1;
+	destRect.extend(src2);
+
+	return !destRect.isEmpty();
+}
+
+void Screen::getPalette(byte palette[PALETTE_SIZE]) {
+	assert(format.bytesPerPixel == 1);
+	g_system->getPaletteManager()->grabPalette(palette, 0, PALETTE_COUNT);
+}
+
+void Screen::getPalette(byte *palette, uint start, uint num) {
+	assert(format.bytesPerPixel == 1);
+	g_system->getPaletteManager()->grabPalette(palette, start, num);
+}
+
+void Screen::setPalette(const byte palette[PALETTE_SIZE]) {
+	assert(format.bytesPerPixel == 1);
+	g_system->getPaletteManager()->setPalette(palette, 0, PALETTE_COUNT);
+}
+
+void Screen::setPalette(const byte *palette, uint start, uint num) {
+	assert(format.bytesPerPixel == 1);
+	g_system->getPaletteManager()->setPalette(palette, start, num);
+}
+
+void Screen::clearPalette() {
+	byte palette[PALETTE_SIZE];
+	Common::fill(&palette[0], &palette[PALETTE_SIZE], 0);
+	setPalette(palette);
+}
+
+} // End of namespace Graphics