MFC中使用Picture Control控件显示OpenCV图像几种方法

本文参考自https://blog.csdn.net/byxdaz/article/details/88091164

本人测试代码如下：

// ShowImageInMFCDlg.h : 头文件
//

#pragma once
#include <vector>
#include <string>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;

// CShowImageInMFCDlg 对话框
class CShowImageInMFCDlg : public CDialogEx
{
// 构造
public:
    CShowImageInMFCDlg(CWnd* pParent = NULL);    // 标准构造函数

// 对话框数据
#ifdef AFX_DESIGN_TIME
    enum { IDD = IDD_SHOWIMAGEINMFC_DIALOG };
#endif

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持


// 实现
protected:
    HICON m_hIcon;

    // 生成的消息映射函数
    virtual BOOL OnInitDialog();
    afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
    afx_msg void OnPaint();
    afx_msg HCURSOR OnQueryDragIcon();
    DECLARE_MESSAGE_MAP()
public:
    afx_msg void OnBnClickedBtnReadimg();

private:
    CRect m_rectPic;

    // 方法1：将opencv的显示窗口与MFC的控件链接起来，效果是opencv的窗口恰好覆盖在控件
    HWND hNameWindowParent = nullptr;
    bool showImage(const std::string &cvWindowName, UINT nControlID, cv::Mat mat, bool bRoomToControlSize = false);
    bool detachWindow(const std::string &cvWindowName, HWND hNameWindowParent);
    bool attachWindow(const std::string &cvWindowName, HWND &hNameWindowParent, UINT nControlID);

    // 方法2：使用CvvImage类

    // 方法3：MFC的绘图函数，将opencv图像数据先copy到缓冲区然后在控件上绘制处理
    void DrawMat(cv::Mat &img, UINT nControlID, bool bRoomToControlSize = false);
public:
    afx_msg void OnBnClickedBtnRaed2();
    afx_msg void OnBnClickedBtnRaed3();
};

// ShowImageInMFCDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "ShowImageInMFC.h"
#include "ShowImageInMFCDlg.h"
#include "afxdialogex.h"
#include "CvvImage.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// 用于应用程序“关于”菜单项的 CAboutDlg 对话框

class CAboutDlg : public CDialogEx
{
public:
    CAboutDlg();

// 对话框数据
#ifdef AFX_DESIGN_TIME
    enum { IDD = IDD_ABOUTBOX };
#endif

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

// 实现
protected:
    DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(IDD_ABOUTBOX)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CShowImageInMFCDlg 对话框



CShowImageInMFCDlg::CShowImageInMFCDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(IDD_SHOWIMAGEINMFC_DIALOG, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CShowImageInMFCDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CShowImageInMFCDlg, CDialogEx)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BTN_READIMG, &CShowImageInMFCDlg::OnBnClickedBtnReadimg)
    ON_BN_CLICKED(IDC_BTN_RAED2, &CShowImageInMFCDlg::OnBnClickedBtnRaed2)
    ON_BN_CLICKED(IDC_BTN_RAED3, &CShowImageInMFCDlg::OnBnClickedBtnRaed3)
END_MESSAGE_MAP()


// CShowImageInMFCDlg 消息处理程序

BOOL CShowImageInMFCDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    // 将“关于...”菜单项添加到系统菜单中。

    // IDM_ABOUTBOX 必须在系统命令范围内。
    ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    ASSERT(IDM_ABOUTBOX < 0xF000);

    CMenu* pSysMenu = GetSystemMenu(FALSE);
    if (pSysMenu != NULL)
    {
        BOOL bNameValid;
        CString strAboutMenu;
        bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
        ASSERT(bNameValid);
        if (!strAboutMenu.IsEmpty())
        {
            pSysMenu->AppendMenu(MF_SEPARATOR);
            pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
        }
    }

    // 设置此对话框的图标。  当应用程序主窗口不是对话框时，框架将自动
    //  执行此操作
    SetIcon(m_hIcon, TRUE);            // 设置大图标
    SetIcon(m_hIcon, FALSE);        // 设置小图标

    //// TODO: 在此添加额外的初始化代码

    return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}

void CShowImageInMFCDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if ((nID & 0xFFF0) == IDM_ABOUTBOX)
    {
        CAboutDlg dlgAbout;
        dlgAbout.DoModal();
    }
    else
    {
        CDialogEx::OnSysCommand(nID, lParam);
    }
}

// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。  对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。

void CShowImageInMFCDlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // 用于绘制的设备上下文

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

        // 使图标在工作区矩形中居中
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // 绘制图标
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialogEx::OnPaint();
    }
}

//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CShowImageInMFCDlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}


// 方法1：
void CShowImageInMFCDlg::OnBnClickedBtnReadimg()
{
    // TODO: 在此添加控件通知处理程序代码
    CFileDialog openFileDlg(TRUE,/*FileOpen*/
        _T("*.bmp"),
        NULL,
        OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY /*| OFN_ALLOWMULTISELECT 可以开启多选模式*/,
        _T("Image Files(*.bmp;*.png;*.jpg;*.raw)|*.bmp; *.png; *.jpg; *.raw|All Files (*.*)|*.*||"));
    openFileDlg.m_ofn.lpstrTitle = _T("选择图片");            // 设置对话框的标题

    if (openFileDlg.DoModal() != IDOK) {
        return;
    }
    CString filePath = openFileDlg.GetPathName();

    USES_CONVERSION;
    char *s = T2A(filePath);
    
    if (hNameWindowParent) {
        //不显示图像或销毁图像
        detachWindow("win", hNameWindowParent);
    }
    attachWindow("win", hNameWindowParent, IDC_STATIC_IMAGE);
    Mat mat = imread(s, true);
    showImage("win", IDC_STATIC_IMAGE, mat);
}

bool CShowImageInMFCDlg::attachWindow(const std::string &cvWindowName, HWND &hNameWindowParent, UINT nControlID)
{
    cv::destroyWindow(cvWindowName);
    cv::namedWindow(cvWindowName, WINDOW_AUTOSIZE);
    HWND hWnd = (HWND)cvGetWindowHandle(cvWindowName.c_str());
    hNameWindowParent = ::GetParent(hWnd);
    ::SetParent(hWnd, GetDlgItem(nControlID)->m_hWnd);
    ::ShowWindow(hNameWindowParent, SW_HIDE);
    return true;
}

bool CShowImageInMFCDlg::detachWindow(const std::string &cvWindowName, HWND hNameWindowParent)
{
    cv::destroyWindow(cvWindowName);
    if (hNameWindowParent)
    {
        ::ShowWindow(hNameWindowParent, SW_HIDE);
        ::PostMessage(hNameWindowParent, WM_CLOSE, 0, 0);
    }

    return true;
}

bool CShowImageInMFCDlg::showImage(const std::string &cvWindowName, UINT nControlID, cv::Mat mat, bool bRoomToControlSize)
{
    CRect rect;
    GetDlgItem(nControlID)->GetClientRect(&rect);
    if (bRoomToControlSize)
    {
        cv::resize(mat, mat, cv::Size(rect.Width(), rect.Height()));
    }
    imshow(cvWindowName, mat);

    return true;
}

// 方法2：
void CShowImageInMFCDlg::OnBnClickedBtnRaed2()
{
    // TODO: 在此添加控件通知处理程序代码

    CFileDialog openFileDlg(TRUE,/*FileOpen*/
        _T("*.bmp"),
        NULL,
        OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY /*| OFN_ALLOWMULTISELECT 可以开启多选模式*/,
        _T("Image Files(*.bmp;*.png;*.jpg;*.raw)|*.bmp; *.png; *.jpg; *.raw|All Files (*.*)|*.*||"));
    openFileDlg.m_ofn.lpstrTitle = _T("选择图片");            // 设置对话框的标题

    if (openFileDlg.DoModal() != IDOK) {
        return;
    }
    CString filePath = openFileDlg.GetPathName();

    USES_CONVERSION;
    char *s = T2A(filePath);
    //利用CvvImage显示图像
    IplImage *image;
    image = cvLoadImage(s);
    CvvImage cimg;
    CRect rect;
    GetDlgItem(IDC_STATIC_IMAGE)->GetClientRect(&rect);
    CDC *pDC = GetDlgItem(IDC_STATIC_IMAGE)->GetDC();
    cimg.CopyOf(image);
    cimg.DrawToHDC(pDC->GetSafeHdc(), &rect);
    ReleaseDC(pDC);
}

// 方法3：
void CShowImageInMFCDlg::OnBnClickedBtnRaed3()
{
    CFileDialog openFileDlg(TRUE,/*FileOpen*/
        _T("*.bmp"),
        NULL,
        OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY /*| OFN_ALLOWMULTISELECT 可以开启多选模式*/,
        _T("Image Files(*.bmp;*.png;*.jpg;*.raw)|*.bmp; *.png; *.jpg; *.raw|All Files (*.*)|*.*||"));
    openFileDlg.m_ofn.lpstrTitle = _T("选择图片");            // 设置对话框的标题

    if (openFileDlg.DoModal() != IDOK) {
        return;
    }
    CString filePath = openFileDlg.GetPathName();

    USES_CONVERSION;
    char *s = T2A(filePath);
    // TODO: 在此添加控件通知处理程序代码
    Mat image;
    image = imread(s);
    DrawMat(image, IDC_STATIC_IMAGE, true);
    return;
}


void CShowImageInMFCDlg::DrawMat(cv::Mat &img, UINT nControlID, bool bRoomToControlSize)
{
    cv::Mat imgTmp;
    CRect rect;
    GetDlgItem(nControlID)->GetClientRect(&rect);  // 获取控件大小
    if (bRoomToControlSize)
    {
        cv::resize(img, imgTmp, cv::Size(rect.Width(), rect.Height()));// 缩小或放大Mat并备份
    }
    else
    {
        img.copyTo(imgTmp);
    }

    switch (imgTmp.channels())
    {
    case 1:
        cv::cvtColor(imgTmp, imgTmp, CV_GRAY2BGRA); // GRAY单通道
        break;
    case 3:
        cv::cvtColor(imgTmp, imgTmp, CV_BGR2BGRA);  // BGR三通道
        break;
    default:
        break;
    }

    int pixelBytes = imgTmp.channels()*(imgTmp.depth() + 1); // 计算一个像素多少个字节
                                                             // 制作bitmapinfo(数据头)
    BITMAPINFO bitInfo;
    bitInfo.bmiHeader.biBitCount = 8 * pixelBytes;
    bitInfo.bmiHeader.biWidth = imgTmp.cols;
    bitInfo.bmiHeader.biHeight = -imgTmp.rows;
    bitInfo.bmiHeader.biPlanes = 1;
    bitInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bitInfo.bmiHeader.biCompression = BI_RGB;
    bitInfo.bmiHeader.biClrImportant = 0;
    bitInfo.bmiHeader.biClrUsed = 0;
    bitInfo.bmiHeader.biSizeImage = 0;
    bitInfo.bmiHeader.biXPelsPerMeter = 0;
    bitInfo.bmiHeader.biYPelsPerMeter = 0;
    // Mat.data + bitmap数据头 -> MFC
    CDC *pDC = GetDlgItem(nControlID)->GetDC();
    pDC->SetStretchBltMode(COLORONCOLOR);
    if (bRoomToControlSize)
    {
        ::StretchDIBits(pDC->GetSafeHdc()
            , 0, 0, rect.Width(), rect.Height()
            , 0, 0, imgTmp.cols, imgTmp.rows,
            imgTmp.data, &bitInfo, DIB_RGB_COLORS, SRCCOPY);
    }
    else
    {
        int minWidth = min(imgTmp.cols, rect.Width());
        int minHeight = min(imgTmp.rows, rect.Height());
        ::StretchDIBits(
            pDC->GetSafeHdc(),
            0, 0, minWidth, minHeight,
            0, 0, minWidth, minHeight,
            imgTmp.data,
            &bitInfo,
            DIB_RGB_COLORS,
            SRCCOPY
        );
    }
    ReleaseDC(pDC);
}

CvvImage类的头文件及其实现：

#pragma once

#ifndef CVVIMAGE_CLASS_DEF
#define CVVIMAGE_CLASS_DEF

#include <opencv/cv.h>
#include <opencv/highgui.h>

/* 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

#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);//opencv3.4.4中调用cvGetSize出错，使用以下语句替换
        CvSize size;
        size.width = img->width;
        size.height = img->height;

        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));
}

效果图：