7b7d54df68
by this new function we can set libjpeg "scale_denom" parameter and load jpeg images scaled 1/2 - 1/4 - 1/8 other image formats resized after loading
123 lines
4.1 KiB
C++
123 lines
4.1 KiB
C++
/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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//
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//
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// License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * The name of the copyright holders may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// This software is provided by the copyright holders and contributors "as is" and
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// any express or implied warranties, including, but not limited to, the implied
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// indirect, incidental, special, exemplary, or consequential damages
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// (including, but not limited to, procurement of substitute goods or services;
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// loss of use, data, or profits; or business interruption) however caused
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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//
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//M*/
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#ifndef _GRFMT_BASE_H_
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#define _GRFMT_BASE_H_
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#include "utils.hpp"
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#include "bitstrm.hpp"
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namespace cv
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{
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class BaseImageDecoder;
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class BaseImageEncoder;
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typedef Ptr<BaseImageEncoder> ImageEncoder;
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typedef Ptr<BaseImageDecoder> ImageDecoder;
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///////////////////////////////// base class for decoders ////////////////////////
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class BaseImageDecoder
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{
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public:
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BaseImageDecoder();
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virtual ~BaseImageDecoder() {}
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int width() const { return m_width; }
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int height() const { return m_height; }
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virtual int type() const { return m_type; }
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virtual bool setSource( const String& filename );
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virtual bool setSource( const Mat& buf );
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virtual int setScale( const int& scale_denom );
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virtual bool readHeader() = 0;
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virtual bool readData( Mat& img ) = 0;
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/// Called after readData to advance to the next page, if any.
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virtual bool nextPage() { return false; }
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virtual size_t signatureLength() const;
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virtual bool checkSignature( const String& signature ) const;
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virtual ImageDecoder newDecoder() const;
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protected:
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int m_width; // width of the image ( filled by readHeader )
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int m_height; // height of the image ( filled by readHeader )
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int m_type;
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int m_scale_denom;
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String m_filename;
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String m_signature;
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Mat m_buf;
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bool m_buf_supported;
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};
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///////////////////////////// base class for encoders ////////////////////////////
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class BaseImageEncoder
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{
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public:
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BaseImageEncoder();
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virtual ~BaseImageEncoder() {}
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virtual bool isFormatSupported( int depth ) const;
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virtual bool setDestination( const String& filename );
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virtual bool setDestination( std::vector<uchar>& buf );
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virtual bool write( const Mat& img, const std::vector<int>& params ) = 0;
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virtual String getDescription() const;
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virtual ImageEncoder newEncoder() const;
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virtual void throwOnEror() const;
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protected:
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String m_description;
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String m_filename;
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std::vector<uchar>* m_buf;
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bool m_buf_supported;
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String m_last_error;
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};
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}
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#endif/*_GRFMT_BASE_H_*/
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