Initial commit

engines/saga2/gfx.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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "graphics/surface.h"
+
+#include "saga2/saga2.h"
+
+#include "saga2/gfx.h"
+
+namespace Saga2 {
+
+Renderer::Renderer() {
+	for (int i = 0; i < kMaxBackBufferSources; ++i) {
+		_savedBackBuffers[i] = nullptr;
+	}
+}
+
+Renderer::~Renderer() {
+	for (int i = 0; i < kMaxBackBufferSources; i++) {
+		if (_savedBackBuffers[i]) {
+			delete[] _savedBackBuffers[i];
+			_savedBackBuffers[i] = nullptr;
+		}
+	}
+}
+
+void Renderer::saveBackBuffer(BackBufferSource source) {
+	if (source >= 0 && source < kMaxBackBufferSources) {
+		if (_savedBackBuffers[source])
+			removeSavedBackBuffer(source);
+
+		Graphics::Surface *surf = g_system->lockScreen();
+		int size = surf->w * surf->h;
+
+		_savedBackBuffers[source] = new byte[size];
+		memcpy(_savedBackBuffers[source], surf->getPixels(), size);
+
+		g_system->unlockScreen();
+	}
+}
+
+void Renderer::popSavedBackBuffer(BackBufferSource source) {
+	restoreSavedBackBuffer(source);
+	removeSavedBackBuffer(source);
+}
+
+void Renderer::restoreSavedBackBuffer(BackBufferSource source) {
+	if (source >= 0 && source < kMaxBackBufferSources) {
+		if (_savedBackBuffers[source]) {
+			uint w = g_system->getWidth();
+			uint h = g_system->getHeight();
+			g_system->copyRectToScreen(_savedBackBuffers[source], w, 0, 0, w, h);
+		}
+	}
+}
+
+void Renderer::removeSavedBackBuffer(BackBufferSource source) {
+	if (source >= 0 && source < kMaxBackBufferSources) {
+		if (_savedBackBuffers[source])
+			delete[] _savedBackBuffers[source];
+
+		_savedBackBuffers[source] = nullptr;
+	}
+}
+
+bool Renderer::hasSavedBackBuffer(BackBufferSource source) {
+	return (source >= 0 && source < kMaxBackBufferSources) && _savedBackBuffers[source];
+}
+
+} // end of namespace Saga2