Initial commit

engines/buried/avi_frames.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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995 Presto Studios, Inc.
+ *
+ * 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 "buried/avi_frames.h"
+#include "buried/buried.h"
+#include "buried/graphics.h"
+
+#include "common/system.h"
+#include "graphics/surface.h"
+#include "video/avi_decoder.h"
+
+namespace Buried {
+
+AVIFrames::AVIFrames(const Common::Path &fileName, uint cachedFrames) {
+	_maxCachedFrames = 0;
+	_video = nullptr;
+	_cacheEnabled = false;
+	_lastFrame = nullptr;
+	_lastFrameIndex = -1;
+	_tempFrame = nullptr;
+
+	if (!fileName.empty())
+		open(fileName, cachedFrames);
+}
+
+AVIFrames::~AVIFrames() {
+	close();
+}
+
+bool AVIFrames::open(const Common::Path &fileName, uint cachedFrames) {
+	if (fileName.empty())
+		return false;
+
+	if (_fileName == fileName)
+		return true;
+
+	close();
+
+	_video = new Video::AVIDecoder();
+
+	if (!_video->loadFile(fileName)) {
+		close();
+		return false;
+	}
+
+	_fileName = fileName;
+
+	// Put us into dither mode, for the 8bpp version
+	BuriedEngine *vm = (BuriedEngine *)g_engine;
+	if (!vm->isTrueColor())
+		_video->setDitheringPalette(vm->_gfx->getDefaultPalette());
+
+	if (cachedFrames == 0) {
+		_cacheEnabled = false;
+	} else {
+		_maxCachedFrames = cachedFrames;
+		_cacheEnabled = true;
+	}
+
+	_lastFrameIndex = -1;
+	return true;
+}
+
+void AVIFrames::close() {
+	delete _video;
+	_video = nullptr;
+
+	_fileName.clear();
+
+	flushFrameCache();
+
+	_lastFrameIndex = -1;
+	_lastFrame = nullptr;
+
+	if (_tempFrame) {
+		_tempFrame->free();
+		delete _tempFrame;
+		_tempFrame = nullptr;
+	}
+}
+
+const Graphics::Surface *AVIFrames::getFrame(int frameIndex) {
+	if (!_video)
+		return nullptr;
+
+	if (frameIndex < 0 || frameIndex == _lastFrameIndex)
+		return _lastFrame;
+
+	if (_cacheEnabled) {
+		const Graphics::Surface *cachedFrame = retrieveFrameFromCache(frameIndex);
+		if (cachedFrame)
+			return cachedFrame;
+	}
+
+	if (!_video->seekToFrame(frameIndex))
+		return nullptr;
+
+	const Graphics::Surface *frame = _video->decodeNextFrame();
+	if (!frame)
+		return nullptr;
+
+	if (_tempFrame) {
+		_tempFrame->free();
+		delete _tempFrame;
+		_tempFrame = nullptr;
+	}
+
+	if (_cacheEnabled) {
+		Graphics::Surface *copy;
+
+		if (frame->format == g_system->getScreenFormat()) {
+			copy = new Graphics::Surface();
+			copy->copyFrom(*frame);
+		} else {
+			copy = frame->convertTo(g_system->getScreenFormat());
+		}
+
+		addFrameToCache(frameIndex, copy);
+		_lastFrame = copy;
+	} else {
+		if (frame->format == g_system->getScreenFormat()) {
+			_lastFrame = frame;
+		} else {
+			_lastFrame = _tempFrame = frame->convertTo(g_system->getScreenFormat());
+		}
+	}
+
+	_lastFrameIndex = frameIndex;
+	return _lastFrame;
+}
+
+Graphics::Surface *AVIFrames::getFrameCopy(int frameIndex) {
+	const Graphics::Surface *frame = getFrame(frameIndex);
+	if (!frame)
+		return nullptr;
+
+	Graphics::Surface *copy = new Graphics::Surface();
+	copy->copyFrom(*frame);
+	return copy;
+}
+
+int AVIFrames::getFrameCount() {
+	if (!_video)
+		return 0;
+
+	return _video->getFrameCount();
+}
+
+bool AVIFrames::flushFrameCache() {
+	if (_cachedFrames.empty())
+		return false;
+
+	for (auto &cachedFrame : _cachedFrames) {
+		if (cachedFrame.frame) {
+			cachedFrame.frame->free();
+			delete cachedFrame.frame;
+		}
+	}
+
+	return true;
+}
+
+const Graphics::Surface *AVIFrames::retrieveFrameFromCache(int frameIndex) const {
+	for (const auto &cachedFrame : _cachedFrames)
+		if (cachedFrame.index == frameIndex)
+			return cachedFrame.frame;
+
+	return nullptr;
+}
+
+void AVIFrames::addFrameToCache(int frameIndex, Graphics::Surface *frame) {
+	if (_cachedFrames.size() >= _maxCachedFrames) {
+		CachedFrame &cachedFrame = _cachedFrames.front();
+		if (cachedFrame.frame) {
+			cachedFrame.frame->free();
+			delete cachedFrame.frame;
+		}
+
+		_cachedFrames.pop_front();
+	}
+
+	_cachedFrames.push_back(CachedFrame(frameIndex, frame));
+}
+
+} // End of namespace Buried