GDI/GDI+这些破事

时间：2024-01-02 09:05:14

本文是杂篇，纯属笔记，想到哪写到那！

1、获取像素的RGB以及填充

CPaintDC dc(m_hWnd);

COLORREF color=dc.GetPixel(,);

int R=GetRValue(color);

int G=GetGValue(color);

nt B=GetBValue(color);

dc.FillSolidRect(m_rcWindow,RGB(R,G,B));

2、从图片获取窗体Region

HRGN CreateRegionFromBitmap(Bitmap* bitmap, BYTE alphaValve/* = 0*/)

{

    UINT width = bitmap->GetWidth();

    UINT height = bitmap->GetHeight();

    Color color;

    HRGN hRegion = ::CreateRectRgn(, , width, height);

    HRGN rgn = ::CreateRectRgn(, , width, height);

    for (UINT h = ; h < height; ++h)

    {

        for (UINT w = ; w < width; ++w)

        {

            UINT start = w;

            while (w < width)

            {

                bitmap->GetPixel(w, h, &color);

                if (color.GetAlpha() > alphaValve)

                    break;

                ++w;

            }

            if (w > start)

            {

                ::SetRectRgn(rgn, start, h, w, h + );

                ::CombineRgn(hRegion, hRegion, rgn, RGN_DIFF);

            }

        }

    }

    ::DeleteObject(rgn);

    return hRegion;

}

//////////////////////////
调用：

Bitmap bitmap(_T("图片路径"));

HRGN m_rgn;

m_rgn=CreateRegionFromBitmap(&bitmap,254);//不取半透明图像

3、UpdateLayeredWindow

　　Image *m_pImageBackground;

　　 ModifyStyleEx(, WS_EX_LAYERED);

    typedef BOOL (WINAPI*UpdateLayeredWindowFunc)(HWND,HDC,POINT*,SIZE*,HDC,POINT*,COLORREF,BLENDFUNCTION*,DWORD);

    m_pImageBackground = Image::FromFile(_T("图片路径"));

    PAINTSTRUCT ps;

    HDC hdc = BeginPaint( &ps);

    HDC hdcMem = CreateCompatibleDC(hdc);

    HBITMAP hBitmap = CreateCompatibleBitmap(hdc,,); 

    SelectObject(hdcMem, hBitmap);

    Graphics graph(hdcMem);

    graph.DrawImage(m_pImageBackground, , , , );

    HMODULE hDll = LoadLibrary(_T("user32.DLL"));

    UpdateLayeredWindowFunc UpdateLayeredWindow=(UpdateLayeredWindowFunc)GetProcAddress(hDll, "UpdateLayeredWindow");

    int nClientWith= GetSystemMetrics(SM_CXFULLSCREEN);

    int nClientHeigh= GetSystemMetrics(SM_CYFULLSCREEN);

    int x = (nClientWith-)/;

    int y = (nClientHeigh-)/;

    POINT dstPoint = {x,y};

    POINT srcPoint = {,};

    SIZE size = {,};

    BLENDFUNCTION m_Blend;

    m_Blend.BlendOp=;

    m_Blend.BlendFlags=;

    m_Blend.AlphaFormat=;

    m_Blend.SourceConstantAlpha=;

    UpdateLayeredWindow(m_hWnd,hdc,&dstPoint,&size,hdcMem,&srcPoint,,&m_Blend,);

    FreeLibrary(hDll);

4、画图

CBitmap m_btm_main;

HBITMAP GetBitmapFromFile( LPCWSTR pFile )

    {

        std::auto_ptr<Bitmap> pBmp(new Bitmap(pFile));

        if(!pBmp.get())

            return NULL;

        HBITMAP hBmp = NULL;

        Color backColor = Color(,,,);

        if(Ok!=pBmp->GetHBITMAP(backColor,&hBmp))

            return NULL;

        return hBmp;

    }

    void SetBgBmp(CString strMain)

    {

        m_btm_main.Attach(GetBitmapFromFile(strMain));

    }

    BOOL  DrawBmp( HDC hdc, CRect rect, HBITMAP hBitmap)

    {

        BITMAP bm;

        GetObject(hBitmap,sizeof(bm),(VOID*)&bm);

        INT nWidth = bm.bmWidth;

        INT nHeight = bm.bmHeight;

        CDC memdc;

        memdc.CreateCompatibleDC(hdc);

        CBitmap bitmap;

        bitmap.CreateCompatibleBitmap(hdc,nWidth,nHeight);

        memdc.SelectBitmap(hBitmap);

        BLENDFUNCTION bf = {,,,};

        return ::AlphaBlend(hdc,rect.left,rect.top,nWidth,nHeight,memdc,,,nWidth,nHeight,bf);

  }

调用：

 CPaintDC dc(m_hWnd);

 DrawBmp(dc,m_rcWindow,m_btm_main);

5、设置顶层窗体

在初始化函数中调用

SetWindowPos(HWND_TOPMOST,,,,,SWP_SHOWWINDOW|SWP_NOMOVE|SWP_NOSIZE);

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