基于Opencv实现在MFC中显示图像

//头文件

#pragma once  

#ifndef CVVIMAGE_CLASS_DEF  

#define CVVIMAGE_CLASS_DEF  

#include <Opencv2/opencv.hpp>

/* CvvImage class definition */

class  CvvImage

{

public:
CvvImage();
virtual ~CvvImage();
/* Create image (BGR or grayscale) */
virtual bool  Create(int width, int height, int bits_per_pixel, int image_origin = 0);
/* Load image from specified file */
virtual bool  Load(const char* filename, int desired_color = 1);
/* Load rectangle from the file */
virtual bool  LoadRect(const char* filename,
int desired_color, CvRect r);

#if defined WIN32 || defined _WIN32  
virtual bool  LoadRect(const char* filename,
int desired_color, RECT r)
{
return LoadRect(filename, desired_color,
cvRect(r.left, r.top, r.right - r.left, r.bottom - r.top));
}

#endif  
/* Save entire image to specified file. */
virtual bool  Save(const char* filename);
/* Get copy of input image ROI */
virtual void  CopyOf(CvvImage& image, int desired_color = -1);
virtual void  CopyOf(IplImage* img, int desired_color = -1);
IplImage* GetImage() { return m_img; };
virtual void  Destroy(void);
/* width and height of ROI */
int Width() { return !m_img ? 0 : !m_img->roi ? m_img->width : m_img->roi->width; };
int Height() { return !m_img ? 0 : !m_img->roi ? m_img->height : m_img->roi->height; };
int Bpp() { return m_img ? (m_img->depth & 255)*m_img->nChannels : 0; };
virtual void  Fill(int color);
/* draw to highgui window */
virtual void  Show(const char* window);

#if defined WIN32 || defined _WIN32  
/* draw part of image to the specified DC */
virtual void  Show(HDC dc, int x, int y, int width, int height,
int from_x = 0, int from_y = 0);
/* draw the current image ROI to the specified rectangle of the destination DC */
virtual void  DrawToHDC(HDC hDCDst, RECT* pDstRect);

#endif  

protected:
IplImage*  m_img;

};

//typedef CvvImage CImage;

#endif  

//cpp文件

#include "StdAfx.h"  

#include "CvvImage.h"  

//////////////////////////////////////////////////////////////////////  

// Construction/Destruction  

//////////////////////////////////////////////////////////////////////  

CV_INLINE RECT NormalizeRect(RECT r);

CV_INLINE RECT NormalizeRect(RECT r)

{
int t;
if (r.left > r.right)
{
t = r.left;
r.left = r.right;
r.right = t;
}
if (r.top > r.bottom)
{
t = r.top;
r.top = r.bottom;
r.bottom = t;
}

return r;

}

CV_INLINE CvRect RectToCvRect(RECT sr);

CV_INLINE CvRect RectToCvRect(RECT sr)

{
sr = NormalizeRect(sr);
return cvRect(sr.left, sr.top, sr.right - sr.left, sr.bottom - sr.top);

}

CV_INLINE RECT CvRectToRect(CvRect sr);

CV_INLINE RECT CvRectToRect(CvRect sr)

{
RECT dr;
dr.left = sr.x;
dr.top = sr.y;
dr.right = sr.x + sr.width;
dr.bottom = sr.y + sr.height;

return dr;

}

CV_INLINE IplROI RectToROI(RECT r);

CV_INLINE IplROI RectToROI(RECT r)

{
IplROI roi;
r = NormalizeRect(r);
roi.xOffset = r.left;
roi.yOffset = r.top;
roi.width = r.right - r.left;
roi.height = r.bottom - r.top;
roi.coi = 0;

return roi;

}

void  FillBitmapInfo(BITMAPINFO* bmi, int width, int height, int bpp, int origin)

{
assert(bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32));

BITMAPINFOHEADER* bmih = &(bmi->bmiHeader);

memset(bmih, 0, sizeof(*bmih));
bmih->biSize = sizeof(BITMAPINFOHEADER);
bmih->biWidth = width;
bmih->biHeight = origin ? abs(height) : -abs(height);
bmih->biPlanes = 1;
bmih->biBitCount = (unsigned short)bpp;
bmih->biCompression = BI_RGB;
if (bpp == 8)
{
RGBQUAD* palette = bmi->bmiColors;
int i;
for (i = 0; i < 256; i++)
{
palette[i].rgbBlue = palette[i].rgbGreen = palette[i].rgbRed = (BYTE)i;
palette[i].rgbReserved = 0;
}
}

}

CvvImage::CvvImage()

{
m_img = 0;

}

void CvvImage::Destroy()

{
cvReleaseImage(&m_img);

}

CvvImage::~CvvImage()

{
Destroy();

}

bool  CvvImage::Create(int w, int h, int bpp, int origin)

{
const unsigned max_img_size = 10000;

if ((bpp != 8 && bpp != 24 && bpp != 32) ||
(unsigned)w >= max_img_size || (unsigned)h >= max_img_size ||
(origin != IPL_ORIGIN_TL && origin != IPL_ORIGIN_BL))
{
assert(0); // most probably, it is a programming error  
return false;
}
if (!m_img || Bpp() != bpp || m_img->width != w || m_img->height != h)
{
if (m_img && m_img->nSize == sizeof(IplImage))
Destroy();
/* prepare IPL header */
m_img = cvCreateImage(cvSize(w, h), IPL_DEPTH_8U, bpp / 8);
}
if (m_img)
m_img->origin = origin == 0 ? IPL_ORIGIN_TL : IPL_ORIGIN_BL;
return m_img != 0;

}

void  CvvImage::CopyOf(CvvImage& image, int desired_color)

{
IplImage* img = image.GetImage();
if (img)
{
CopyOf(img, desired_color);
}

}

#define HG_IS_IMAGE(img) ((img) != 0 && ((const IplImage*)(img))->nSize == sizeof(IplImage) && ((IplImage*)img)->imageData != 0)

void  CvvImage::CopyOf(IplImage* img, int desired_color)

{
if (HG_IS_IMAGE(img))
{
int color = desired_color;
CvSize size = cvGetSize(img);
if (color < 0)
color = img->nChannels > 1;
if (Create(size.width, size.height,
(!color ? 1 : img->nChannels > 1 ? img->nChannels : 3) * 8,
img->origin))
{
cvConvertImage(img, m_img, 0);
}
}

}

bool  CvvImage::Load(const char* filename, int desired_color)

{
IplImage* img = cvLoadImage(filename, desired_color);
if (!img)
return false;

CopyOf(img, desired_color);
cvReleaseImage(&img);

return true;

}

bool  CvvImage::LoadRect(const char* filename,
int desired_color, CvRect r)

{
if (r.width < 0 || r.height < 0) return false;

IplImage* img = cvLoadImage(filename, desired_color);
if (!img)
return false;
if (r.width == 0 || r.height == 0)
{
r.width = img->width;
r.height = img->height;
r.x = r.y = 0;
}
if (r.x > img->width || r.y > img->height ||
r.x + r.width < 0 || r.y + r.height < 0)
{
cvReleaseImage(&img);
return false;
}
/* truncate r to source image */
if (r.x < 0)
{
r.width += r.x;
r.x = 0;
}
if (r.y < 0)
{
r.height += r.y;
r.y = 0;
}
if (r.x + r.width > img->width)
r.width = img->width - r.x;

if (r.y + r.height > img->height)
r.height = img->height - r.y;
cvSetImageROI(img, r);
CopyOf(img, desired_color);
cvReleaseImage(&img);

return true;

}

bool  CvvImage::Save(const char* filename)

{
if (!m_img)
return false;
cvSaveImage(filename, m_img);
return true;

}

void  CvvImage::Show(const char* window)

{
if (m_img)
cvShowImage(window, m_img);

}

void  CvvImage::Show(HDC dc, int x, int y, int w, int h, int from_x, int from_y)

{
if (m_img && m_img->depth == IPL_DEPTH_8U)
{
uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
BITMAPINFO* bmi = (BITMAPINFO*)buffer;
int bmp_w = m_img->width, bmp_h = m_img->height;
FillBitmapInfo(bmi, bmp_w, bmp_h, Bpp(), m_img->origin);
from_x = MIN(MAX(from_x, 0), bmp_w - 1);
from_y = MIN(MAX(from_y, 0), bmp_h - 1);
int sw = MAX(MIN(bmp_w - from_x, w), 0);
int sh = MAX(MIN(bmp_h - from_y, h), 0);
SetDIBitsToDevice(
dc, x, y, sw, sh, from_x, from_y, from_y, sh,
m_img->imageData + from_y*m_img->widthStep,
bmi, DIB_RGB_COLORS);
}

}

void  CvvImage::DrawToHDC(HDC hDCDst, RECT* pDstRect)

{
if (pDstRect && m_img && m_img->depth == IPL_DEPTH_8U && m_img->imageData)
{
uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
BITMAPINFO* bmi = (BITMAPINFO*)buffer;
int bmp_w = m_img->width, bmp_h = m_img->height;
CvRect roi = cvGetImageROI(m_img);
CvRect dst = RectToCvRect(*pDstRect);
if (roi.width == dst.width && roi.height == dst.height)
{
Show(hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y);
return;
}
if (roi.width > dst.width)
{
SetStretchBltMode(
hDCDst,           // handle to device context  
HALFTONE);
}
else
{
SetStretchBltMode(
hDCDst,           // handle to device context  
COLORONCOLOR);
}
FillBitmapInfo(bmi, bmp_w, bmp_h, Bpp(), m_img->origin);
::StretchDIBits(
hDCDst,
dst.x, dst.y, dst.width, dst.height,
roi.x, roi.y, roi.width, roi.height,
m_img->imageData, bmi, DIB_RGB_COLORS, SRCCOPY);
}

}

void  CvvImage::Fill(int color)

{
cvSet(m_img, cvScalar(color & 255, (color >> 8) & 255, (color >> 16) & 255, (color >> 24) & 255));

}