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engines/sci/video/seq_decoder.h

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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/>.
+ *
+ */
+
+#ifndef SCI_VIDEO_SEQ_DECODER_H
+#define SCI_VIDEO_SEQ_DECODER_H
+
+#include "common/rational.h"
+#include "graphics/pixelformat.h"
+#include "video/video_decoder.h"
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace Graphics {
+struct Surface;
+}
+
+namespace Sci {
+
+/**
+ * Implementation of the Sierra SEQ decoder, used in KQ6 DOS floppy/CD and GK1 DOS
+ */
+class SEQDecoder : public Video::VideoDecoder {
+public:
+	SEQDecoder(uint frameDelay);
+	~SEQDecoder() override;
+
+	bool loadStream(Common::SeekableReadStream *stream) override;
+
+private:
+	class SEQVideoTrack : public FixedRateVideoTrack {
+	public:
+		SEQVideoTrack(Common::SeekableReadStream *stream, uint frameDelay);
+		~SEQVideoTrack() override;
+
+		uint16 getWidth() const override { return SEQ_SCREEN_WIDTH; }
+		uint16 getHeight() const override { return SEQ_SCREEN_HEIGHT; }
+		Graphics::PixelFormat getPixelFormat() const override { return Graphics::PixelFormat::createFormatCLUT8(); }
+		int getCurFrame() const override { return _curFrame; }
+		int getFrameCount() const override { return _frameCount; }
+		const Graphics::Surface *decodeNextFrame() override;
+		const byte *getPalette() const override;
+		bool hasDirtyPalette() const override { return _dirtyPalette; }
+
+	protected:
+		Common::Rational getFrameRate() const override { return Common::Rational(60, _frameDelay); }
+
+	private:
+		enum {
+			SEQ_SCREEN_WIDTH = 320,
+			SEQ_SCREEN_HEIGHT = 200
+		};
+
+		void readPaletteChunk(uint16 chunkSize);
+		bool decodeFrame(byte *rleData, int rleSize, byte *litData, int litSize, byte *dest, int left, int width, int height, int colorKey);
+
+		Common::SeekableReadStream *_fileStream;
+		int _curFrame, _frameCount;
+		byte _palette[256 * 3];
+		mutable bool _dirtyPalette;
+		Graphics::Surface *_surface;
+		uint _frameDelay;
+	};
+
+	uint _frameDelay;
+};
+
+} // End of namespace Sci
+
+#endif // SCI_VIDEO_SEQ_DECODER_H