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115 lines
3.1 KiB
C++
115 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_JPEG_H
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#define IMAGE_JPEG_H
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#include "graphics/surface.h"
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#include "image/image_decoder.h"
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#include "image/codecs/codec.h"
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namespace Common {
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class SeekableReadStream;
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}
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namespace Image {
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/**
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* @defgroup image_jpeg JPEG decoder
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* @ingroup image
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*
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* @brief Decoder for JPEG images.
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*
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* Used in engines:
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* - Groovie
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* - Mohawk
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* - Wintermute
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* @{
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*/
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class JPEGDecoder : public ImageDecoder, public Codec {
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public:
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JPEGDecoder();
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~JPEGDecoder();
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// ImageDecoder API
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virtual void destroy();
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virtual bool loadStream(Common::SeekableReadStream &str);
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virtual const Graphics::Surface *getSurface() const;
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// Codec API
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const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream);
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Graphics::PixelFormat getPixelFormat() const;
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// Special API for JPEG
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enum ColorSpace {
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/**
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* Output RGB data in the pixel format specified using `setOutputPixelFormat`.
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*
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* This is the default output.
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*/
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kColorSpaceRGB,
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/**
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* Output (interleaved) YUV data.
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*
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* Be aware that some images cannot be output in YUV mode.
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* These are (non-standard) JPEG images which are in RGB colorspace.
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*
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* The resulting Surface will have a PixelFormat with 3 bytes per
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* pixel and the remaining entries are completely zeroed. This works
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* around the fact that PixelFormat can only describe RGB formats.
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*
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* You should only use this when you are really aware of what you are
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* doing!
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*/
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kColorSpaceYUV
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};
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/**
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* Request the output color space. This can be used to obtain raw YUV
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* data from the JPEG file. But this might not work for all files!
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*
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* The decoder itself defaults to RGB.
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*
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* @param outSpace The color space to output.
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*/
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void setOutputColorSpace(ColorSpace outSpace) { _colorSpace = outSpace; }
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/**
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* Request the output pixel format. The JPEG decoder provides high performance
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* color conversion routines for some pixel formats. This setting allows to use
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* them and avoid costly subsequent color conversion.
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*/
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void setOutputPixelFormat(const Graphics::PixelFormat &format) { _requestedPixelFormat = format; }
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private:
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Graphics::Surface _surface;
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ColorSpace _colorSpace;
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Graphics::PixelFormat _requestedPixelFormat;
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Graphics::PixelFormat getByteOrderRgbPixelFormat() const;
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};
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/** @} */
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} // End of namespace Image
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#endif
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