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https://github.com/libretro/scummvm.git
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93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef IMAGE_CODECS_XAN_H
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#define IMAGE_CODECS_XAN_H
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#include "image/codecs/codec.h"
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namespace Image {
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/**
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* Xan image decoder. (fourcc Xxan)
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*
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* Used by Crusader: No Regret AVI files
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*
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* This code was created based on the multimedia wiki:
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* https://wiki.multimedia.cx/index.php/Origin_Xan_Codec
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* and ffmpeg's libavcodec/xxan.c.
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* The ffmpeg code is LGPL2 licensed and Copyright (C) 2011
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* Konstantin Shishkov based on work by Mike Melanson.
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*
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* A similar format is used in Wing Commander III (although not in an AVI
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* container) and IV.
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*/
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class XanDecoder : public Codec {
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public:
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XanDecoder (int width, int height, int bitsPerPixel);
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~XanDecoder() override;
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const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) override;
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Graphics::PixelFormat getPixelFormat() const override { return _pixelFormat; }
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bool setOutputPixelFormat(const Graphics::PixelFormat &format) override { _pixelFormat = format; return true; }
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private:
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void decodeFrameType0(Common::SeekableReadStream &stream);
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void decodeFrameType1(Common::SeekableReadStream &stream);
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/** Decompress the huffman table for base luma data */
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void decompressLuma(Common::SeekableReadStream &stream);
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bool decodeChroma(Common::SeekableReadStream &stream, int chroma_off);
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/** convert the internally expanded YUV to the output RGBA surface */
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void convertYUVtoRGBSurface();
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/** A buffer to hold the final frame */
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Graphics::Surface *_surface;
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/** Dest surface width and height */
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int _width, _height;
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/** Dest surface pixel format */
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Graphics::PixelFormat _pixelFormat;
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/** If true, decode chroma vals in Wing Commander 4 style (false = No Regret style) */
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bool _wc4Mode;
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/** A buffer to hold scratch data. Either chroma data in progress, or
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* decompressed delta luma values (5-bit). Interpretation depends on frame type. */
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uint8 *_scratchbuf;
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/** A buffer to hold expanded/interpolated absolute luma values (6-bit) from the values in _scratchbuf.
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* These still need to be multiplied out to make 8-bit values. */
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uint8 *_lumabuf;
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/** a buffer for uncompressed and multiplied out "y" values (of yuv) */
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uint8 *_ybuf;
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/** a buffer for uncompressed "u" values (of yuv) */
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uint8 *_ubuf;
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/** a buffer for uncompressed "v" values (of yuv) */
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uint8 *_vbuf;
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};
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} // End of namespace Image
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#endif
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