image.hpp
上传用户:yhdzpy8989
上传日期:2007-06-13
资源大小:13604k
文件大小:7k
- /*
- * ===========================================================================
- * PRODUCTION $Log: image.hpp,v $
- * PRODUCTION Revision 1000.1 2003/11/05 15:27:41 gouriano
- * PRODUCTION PRODUCTION: UPGRADED [ORIGINAL] Dev-tree R1.6
- * PRODUCTION
- * ===========================================================================
- */
- #ifndef UTIL_IMAGE___IMAGE__HPP
- #define UTIL_IMAGE___IMAGE__HPP
- /* $Id: image.hpp,v 1000.1 2003/11/05 15:27:41 gouriano Exp $
- * ===========================================================================
- *
- * PUBLIC DOMAIN NOTICE
- * National Center for Biotechnology Information
- *
- * This software/database is a "United States Government Work" under the
- * terms of the United States Copyright Act. It was written as part of
- * the author's official duties as a United States Government employee and
- * thus cannot be copyrighted. This software/database is freely available
- * to the public for use. The National Library of Medicine and the U.S.
- * Government have not placed any restriction on its use or reproduction.
- *
- * Although all reasonable efforts have been taken to ensure the accuracy
- * and reliability of the software and data, the NLM and the U.S.
- * Government do not and cannot warrant the performance or results that
- * may be obtained by using this software or data. The NLM and the U.S.
- * Government disclaim all warranties, express or implied, including
- * warranties of performance, merchantability or fitness for any particular
- * purpose.
- *
- * Please cite the author in any work or product based on this material.
- *
- * ===========================================================================
- *
- * Authors: Mike DiCuccio
- *
- * File Description:
- * CImage -- interface for manipulating image data
- */
- #include <corelib/ncbiobj.hpp>
- BEGIN_NCBI_SCOPE
- //
- // class CImage defines an interface for manipulating image data.
- //
- // CImage holds a single image, defined by a data strip that represents the
- // pixels of the image. This class holds the image dimensions (width x height)
- // as well as the image's "depth" - that is, the number of channels per pixel.
- // In this notion, a single channel corresponds to a single color plane. Thus,
- // an image with three channels is an RGB image, and the data is a set of
- // interleaved RGB values such that the pixel at (0, 0) of the image is the
- // first in the strip, and the first three bytes of the strip are the valus of
- // the red, gren, and blue channels repsectively.
- //
- // CImage currently supports RGB and RGBA images (that is, images with depth =
- // 3 and depth = 4).
- //
- // There are wto mechanisms to access the image data - you can access the data
- // as a raw strip in which you will need to dereference the RGB channels
- // yourself, or you can access a single pixel using operator(), supplying x and
- // y coordinates. The returned value is an unsigned char* that can be indexed
- // using the enumerated offsets eRed, eGreen, eBlue, and eAlpha.
- //
- class NCBI_XIMAGE_EXPORT CImage : public CObject
- {
- public:
- // typedef for pixel type
- // this is an unsigned char*; it represents a 3- or 4-member data chunk
- // ordered as red/green/blue(/alpha) that can be indexed with the enum
- // below.
- typedef unsigned char* TPixel;
- typedef const unsigned char* TConstPixel;
- // typedef for our image strip
- typedef vector<unsigned char> TImageStrip;
- // enum for image channels (= offset from pixel position)
- enum EChannel {
- eRed = 0,
- eGreen = 1,
- eBlue = 2,
- eAlpha = 3
- };
- // constructors
- CImage(void);
- CImage(size_t width, size_t height, size_t depth = 3);
- // access the image strip data. This is a set of interleaved RGB or RGBA
- // values in row-major order.
- const unsigned char* GetData(void) const;
- unsigned char* SetData(void);
- // access a single pixel in the data string, indexed by x and y position.
- TConstPixel operator() (size_t x, size_t y) const;
- TPixel operator() (size_t x, size_t y);
- // access the dimensions of this image
- size_t GetWidth(void) const { return m_Width; }
- size_t GetHeight(void) const { return m_Height; }
- // access the aspect ratio for the image
- // This is just width / height
- float GetAspectRatio(void) const;
- // access the depth (= number of channels) for this image.
- // This will be either 3 or 4 (3 = 3 components per pixel, or 24-bit; 4 = 4
- // components per pixel, or 32-bit)
- size_t GetDepth(void) const { return m_Depth; }
- // set the depth for an image. NOTE: this will create an empty alpha
- // channel or drop the existing one, as required!
- void SetDepth(size_t depth);
- // set one of the 3 (or 4) channels of the image to a given value
- void SetChannel(size_t channel, unsigned char val);
- void SetRed (unsigned char val);
- void SetGreen(unsigned char val);
- void SetBlue (unsigned char val);
- void SetAlpha(unsigned char val, bool add_channel = false);
- // get a subset of this image
- CImage* GetSubImage(size_t x, size_t y, size_t w, size_t h) const;
- // initialize this image
- void Init(size_t width, size_t height, size_t depth);
- // flip the image top -> bottom. This is necessary because some image
- // formats are explicitly inverted, and many (most? all?) frane buffers are
- // flipped as well.
- void Flip(void);
- private:
- size_t m_Width;
- size_t m_Height;
- size_t m_Depth;
- TImageStrip m_Data;
- // forbid copying
- CImage(const CImage&);
- CImage& operator=(const CImage&);
- };
- //
- // index into our data strip
- //
- inline
- CImage::TConstPixel CImage::operator() (size_t x, size_t y) const
- {
- _ASSERT(x < m_Height);
- _ASSERT(y < m_Width);
- return &(m_Data[ (x * m_Width + y) * m_Depth ]);
- }
- inline
- CImage::TPixel CImage::operator() (size_t x, size_t y)
- {
- _ASSERT(x < m_Height);
- _ASSERT(y < m_Width);
- return &(m_Data[ (x * m_Width + y) * m_Depth ]);
- }
- //
- // set the red channel to a given value. The red channel is channel 0.
- //
- inline
- void CImage::SetRed(unsigned char val)
- {
- SetChannel(eRed, val);
- }
- //
- // set the green channel to a given value. The green channel is channel 1.
- //
- inline
- void CImage::SetGreen(unsigned char val)
- {
- SetChannel(eAlpha, val);
- }
- //
- // set the blue channel to a given value. The blue channel is channel 2.
- //
- inline
- void CImage::SetBlue(unsigned char val)
- {
- SetChannel(eBlue, val);
- }
- END_NCBI_SCOPE
- /*
- * ===========================================================================
- * $Log: image.hpp,v $
- * Revision 1000.1 2003/11/05 15:27:41 gouriano
- * PRODUCTION: UPGRADED [ORIGINAL] Dev-tree R1.6
- *
- * Revision 1.6 2003/11/03 15:15:08 dicuccio
- * Fixed indexing of images - operator() now returns (row, column)
- *
- * Revision 1.5 2003/08/27 16:44:32 ivanov
- * Changed class export specifier to NCBI_XIMAGE_EXPORT
- *
- * Revision 1.4 2003/06/12 19:44:39 dicuccio
- * Added function to flip an image along the y-axis
- *
- * Revision 1.3 2003/06/09 19:17:32 dicuccio
- * Added GetAspectRatio()
- *
- * Revision 1.2 2003/06/03 20:04:24 dicuccio
- * Added export specifiers
- *
- * Revision 1.1 2003/06/03 15:17:41 dicuccio
- * Initial revision of image library
- *
- * ===========================================================================
- */
- #endif // UTIL_IMAGE___IMAGE__HPP