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image/codecs/truemotion1.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/>.
+ *
+ */
+
+// Based on the TrueMotion 1 decoder by Alex Beregszaszi & Mike Melanson in FFmpeg
+
+#ifndef IMAGE_CODECS_TRUEMOTION1_H
+#define IMAGE_CODECS_TRUEMOTION1_H
+
+#include "image/codecs/codec.h"
+
+namespace Image {
+
+/**
+ * Duck TrueMotion 1 decoder.
+ *
+ * Used by BMP/AVI.
+ */
+class TrueMotion1Decoder : public Codec {
+public:
+	TrueMotion1Decoder();
+	~TrueMotion1Decoder() override;
+
+	const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) override;
+
+	// Always return RGB565
+	Graphics::PixelFormat getPixelFormat() const override { return Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0); }
+
+private:
+	Graphics::Surface *_surface;
+
+	int _mbChangeBitsRowSize;
+	byte *_buf, *_mbChangeBits, *_indexStream;
+	int _indexStreamSize;
+
+	int _flags;
+
+	struct PredictorTableEntry {
+		uint32 color;
+		bool getNextIndex;
+	};
+
+	PredictorTableEntry _yPredictorTable[1024];
+	PredictorTableEntry _cPredictorTable[1024];
+
+	int _blockType;
+	int _blockWidth;
+	int _blockHeight;
+
+	int16 _ydt[8];
+	int16 _cdt[8];
+
+	int _lastDeltaset, _lastVectable;
+
+	uint32 *_vertPred;
+
+	struct {
+		byte headerSize;
+		byte compression;
+		byte deltaset;
+		byte vectable;
+		uint16 ysize;
+		uint16 xsize;
+		uint16 checksum;
+		byte version;
+		byte headerType;
+		byte flags;
+		byte control;
+		uint16 xoffset;
+		uint16 yoffset;
+		uint16 width;
+		uint16 height;
+	} _header;
+
+	void selectDeltaTables(int deltaTableIndex);
+	void decodeHeader(Common::SeekableReadStream &stream);
+	void decode16();
+	int makeYdt16Entry(int p1, int p2);
+	int makeCdt16Entry(int p1, int p2);
+	void genVectorTable16(const byte *selVectorTable);
+};
+
+} // End of namespace Image
+
+#endif // IMAGE_CODECS_TRUEMOTION1_H