【转载】C++ 轻松实现透明位图(zhuan)

链接：

https://blog.csdn.net/aikker/article/details/4050888

在开发界面及棋牌游戏过程中，需要很多镂空的图片,而且图片形式一般比较固定.
所以封装了几种常见的镂空方法.

1. 用于没有掩码图,只有指定透明色,不进行伸缩
void DrawTransBitmap( HDC hdcDest, // 目标DC
int nXOriginDest, // 目标X偏移
int nYOriginDest, // 目标Y偏移
int nWidthDest, // 目标宽度
int nHeightDest, // 目标高度
HDC hdcSrc, // 源DC
int nXOriginSrc, // 源X起点
int nYOriginSrc, // 源Y起点
COLORREF crTransparent // 透明色,COLORREF类型
);

2. 用于没有掩码图,只有指定透明色,可以进行伸缩
void DrawTransBitmap( HDC hdcDest, // 目标DC
int nXOriginDest, // 目标X偏移
int nYOriginDest, // 目标Y偏移
int nWidthDest, // 目标宽度
int nHeightDest, // 目标高度
HDC hdcSrc, // 源DC
int nXOriginSrc, // 源X起点
int nYOriginSrc, // 源Y起点
int nWidthSrc, // 源宽度
int nHeightSrc, // 源高度
COLORREF crTransparent // 透明色,COLORREF类型
);

3.指定掩码图,和掩码图属于不同图片
void DrawTransBitmap( HDC hdcDest, // 目标DC
int nXOriginDest, // 目标X偏移
int nYOriginDest, // 目标Y偏移
int nWidthDest, // 目标宽度
int nHeightDest, // 目标高度
HDC hdcSrc, // 源DC
HDC hdcMask, //掩码DC
int nXOriginSrc, // 源X起点
int nYOriginSrc, // 源Y起点
COLORREF crTransparent // 透明色,COLORREF类型
);

4.指定图片和掩码图同属于一张图片
void DrawTransBitmap(HDC hDC,
int nPosX,
int nPosY,
int nCX,
int nCY,
HBITMAP hObj
);

5.得到位图HRGN
HRGN CreateBitmapRgn(int nWidth,int nHeight,HBITMAP hbmp,COLORREF cTrans);

以下是完整代码
//用于没有掩码图,只有指定透明色,不进行伸缩
//方法一：

void DrawTransBitmap( HDC hdcDest,      //目标DC
                    int nXOriginDest,   //目标X偏移
                    int nYOriginDest,   //目标Y偏移
                    int nWidthDest,     //目标宽度
                    int nHeightDest,    //目标高度
                    HDC hdcSrc,         //源DC
                    int nXOriginSrc,    //源X起点
                    int nYOriginSrc,    //源Y起点
                    COLORREF crTransparent  //透明色,COLORREF类型
)

{

    HBITMAP hOldImageBMP, hImageBMP= CreateCompatibleBitmap(hdcDest, nWidthDest, nHeightDest);    //创建兼容位图
    HBITMAP hOldMaskBMP, hMaskBMP = CreateBitmap(nWidthDest, nHeightDest, 1, 1, NULL);            //创建单色掩码位图
    HDC        hImageDC = CreateCompatibleDC(hdcDest);//临时DC
    HDC        hMaskDC = CreateCompatibleDC(hdcDest);//临时掩码DC
    hOldImageBMP =(HBITMAP)SelectObject(hImageDC, hImageBMP);

    hOldMaskBMP=(HBITMAP)SelectObject(hMaskDC, hMaskBMP);//将源DC中的位图拷贝到临时DC中,源DC已经载入位图
     BitBlt(hImageDC, 0, 0, nWidthDest, nHeightDest, hdcSrc, nXOriginSrc, nYOriginSrc, SRCCOPY);//设置临时DC的透明色
SetBkColor(hImageDC, crTransparent);//生成透明区域为白色，其它区域为黑色的临时掩码DC的掩码位图//位图来自临时DC
    BitBlt(hMaskDC, 0, 0, nWidthDest, nHeightDest, hImageDC, 0, 0, SRCCOPY);//生成透明区域为黑色，其它区域保持不变的位图
    SetBkColor(hImageDC, RGB(0,0,0));

    SetTextColor(hImageDC, RGB(255,255,255));

    BitBlt(hImageDC,0, 0, nWidthDest, nHeightDest, hMaskDC, 0, 0, SRCAND);//透明部分保持屏幕不变，其它部分变成黑色
    SetBkColor(hdcDest,RGB(255,255,255));

    SetTextColor(hdcDest,RGB(0,0,0));

     BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hMaskDC,0, 0, SRCAND);//"或"运算,生成最终效果
    BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hImageDC, 0, 0, SRCPAINT);//清理、恢复
SelectObject(hImageDC, hOldImageBMP);

    DeleteDC(hImageDC);

    SelectObject(hMaskDC, hOldMaskBMP);

    DeleteDC(hMaskDC);

    DeleteObject(hImageBMP);

    DeleteObject(hMaskBMP);

}

//用于没有掩码图,只有指定透明色,不进行伸缩
//方法二：

void DrawTransBitmap( HDC hdcDest,      //目标DC
                    int nXOriginDest,   //目标X偏移
                    int nYOriginDest,   //目标Y偏移
                    int nWidthDest,     //目标宽度
                    int nHeightDest,    //目标高度
                    HDC hdcSrc,         //源DC
                    int nXOriginSrc,    //源X起点
                    int nYOriginSrc,    //源Y起点
                    COLORREF crTransparent  //透明色,COLORREF类型
)

{

    HBITMAP hOldImageBMP, hImageBMP= CreateCompatibleBitmap(hdcDest, nWidthDest, nHeightDest);    //创建兼容位图
    HBITMAP hOldMaskBMP, hMaskBMP = CreateBitmap(nWidthDest, nHeightDest, 1, 1, NULL);            //创建单色掩码位图
    HDC        hImageDC = CreateCompatibleDC(hdcDest);//临时DC
    HDC        hMaskDC = CreateCompatibleDC(hdcDest);//临时掩码DC
    hOldImageBMP =(HBITMAP)SelectObject(hImageDC, hImageBMP);

    hOldMaskBMP=(HBITMAP)SelectObject(hMaskDC, hMaskBMP);//将源DC中的位图拷贝到临时DC中,源DC已经载入位图
     BitBlt(hImageDC, 0, 0, nWidthDest, nHeightDest, hdcSrc, nXOriginSrc, nYOriginSrc, SRCCOPY);//设置临时DC的透明色
SetBkColor(hImageDC, crTransparent);//生成透明区域为白色，其它区域为黑色的临时掩码DC的掩码位图//位图来自临时DC
    BitBlt(hMaskDC, 0, 0, nWidthDest, nHeightDest, hImageDC, 0, 0, SRCCOPY);



            

    BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hImageDC,0, 0, SRCINVERT);

         

    BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hMaskDC,0, 0, SRCAND);



    BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hImageDC,0, 0, SRCINVERT);//清理、恢复
SelectObject(hImageDC, hOldImageBMP);

    DeleteDC(hImageDC);

    SelectObject(hMaskDC, hOldMaskBMP);

    DeleteDC(hMaskDC);

    DeleteObject(hImageBMP);

    DeleteObject(hMaskBMP);

}

//用于没有掩码图,只有指定透明色，可以进行伸缩
//方法一：

void DrawTransBitmap( HDC hdcDest,      //目标DC
                     int nXOriginDest,   //目标X偏移
                     int nYOriginDest,   //目标Y偏移
                     int nWidthDest,     //目标宽度
                     int nHeightDest,    //目标高度
                     HDC hdcSrc,         //源DC
                     int nXOriginSrc,    //源X起点
                     int nYOriginSrc,    //源Y起点
                     int nWidthSrc,      //源宽度
                     int nHeightSrc,     //源高度
                     COLORREF crTransparent  //透明色,COLORREF类型
)

{

    HBITMAP hOldImageBMP, hImageBMP= CreateCompatibleBitmap(hdcDest, nWidthDest, nHeightDest);    //创建兼容位图
    HBITMAP hOldMaskBMP, hMaskBMP = CreateBitmap(nWidthDest, nHeightDest, 1, 1, NULL);            //创建单色掩码位图
    HDC        hImageDC =CreateCompatibleDC(hdcDest);

    HDC        hMaskDC=CreateCompatibleDC(hdcDest);

    hOldImageBMP=(HBITMAP)SelectObject(hImageDC, hImageBMP);

    hOldMaskBMP=(HBITMAP)SelectObject(hMaskDC, hMaskBMP);//将源DC中的位图拷贝到临时DC中
    if (nWidthDest == nWidthSrc && nHeightDest ==nHeightSrc)

    {

        BitBlt(hImageDC,0, 0, nWidthDest, nHeightDest, hdcSrc, nXOriginSrc, nYOriginSrc, SRCCOPY);

    }else{

        StretchBlt(hImageDC,0, 0, nWidthDest, nHeightDest,

        hdcSrc, nXOriginSrc, nYOriginSrc, nWidthSrc, nHeightSrc, SRCCOPY);

    }//设置透明色
SetBkColor(hImageDC, crTransparent);//生成透明区域为白色，其它区域为黑色的掩码位图
    BitBlt(hMaskDC, 0, 0, nWidthDest, nHeightDest, hImageDC, 0, 0, SRCCOPY);//生成透明区域为黑色，其它区域保持不变的位图
    SetBkColor(hImageDC, RGB(0,0,0));

    SetTextColor(hImageDC, RGB(255,255,255));

    BitBlt(hImageDC,0, 0, nWidthDest, nHeightDest, hMaskDC, 0, 0, SRCAND);//透明部分保持屏幕不变，其它部分变成黑色
    SetBkColor(hdcDest,RGB(0xff,0xff,0xff));

    SetTextColor(hdcDest,RGB(0,0,0));

    BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hMaskDC,0, 0, SRCAND);//"或"运算,生成最终效果
    BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hImageDC, 0, 0, SRCPAINT);

   

    SelectObject(hImageDC, hOldImageBMP);

    DeleteDC(hImageDC);

    SelectObject(hMaskDC, hOldMaskBMP);

    DeleteDC(hMaskDC);

    DeleteObject(hImageBMP);

    DeleteObject(hMaskBMP);

   

}

//用于没有掩码图,只有指定透明色，可以进行伸缩
//方法二：

void DrawTransBitmap( HDC hdcDest,      //目标DC
                     int nXOriginDest,   //目标X偏移
                     int nYOriginDest,   //目标Y偏移
                     int nWidthDest,     //目标宽度
                     int nHeightDest,    //目标高度
                     HDC hdcSrc,         //源DC
                     int nXOriginSrc,    //源X起点
                     int nYOriginSrc,    //源Y起点
                     int nWidthSrc,      //源宽度
                     int nHeightSrc,     //源高度
                     COLORREF crTransparent  //透明色,COLORREF类型
)

{if (nWidthDest < 1) return false;if (nWidthSrc < 1) return false;if (nHeightDest < 1) return false;if (nHeightSrc < 1) return false;

      HDC dc=CreateCompatibleDC(NULL);

      HBITMAP bitmap= CreateBitmap(nWidthSrc, nHeightSrc, 1, GetDeviceCaps(dc,

      BITSPIXEL), NULL);if (bitmap ==NULL)

       {

                DeleteDC(dc);return false;

        }

     

    HBITMAP oldBitmap=(HBITMAP)SelectObject(dc, bitmap);if (!BitBlt(dc, 0, 0, nWidthSrc, nHeightSrc, dcSrc, nXOriginSrc,

                     nYOriginSrc, SRCCOPY))

    {

               SelectObject(dc, oldBitmap);

               DeleteObject(bitmap);        

         DeleteDC(dc);return false;

    }

      

    HDC maskDC=CreateCompatibleDC(NULL);

     HBITMAP maskBitmap= CreateBitmap(nWidthSrc, nHeightSrc, 1, 1, NULL);if (maskBitmap ==NULL)

      {

          SelectObject(dc, oldBitmap);

           DeleteObject(bitmap);        

           DeleteDC(dc);               

           DeleteDC(maskDC);return false;

       }

       HBITMAP oldMask=(HBITMAP)SelectObject(maskDC, maskBitmap);

       SetBkColor(maskDC, RGB(0,0,0));

       SetTextColor(maskDC, RGB(255,255,255));if (!BitBlt(maskDC, 0,0,nWidthSrc,nHeightSrc,NULL,0,0,BLACKNESS))

       {

              SelectObject(maskDC, oldMask);

              DeleteObject(maskBitmap);      

              DeleteDC(maskDC);              

              SelectObject(dc, oldBitmap);   

              DeleteObject(bitmap);         

              DeleteDC(dc);return false;

       }

       SetBkColor(dc, crTransparent);

       BitBlt(maskDC,0,0,nWidthSrc,nHeightSrc,dc,0,0,SRCINVERT);

      SetBkColor(dc, RGB(0,0,0));

       SetTextColor(dc, RGB(255,255,255));

       BitBlt(dc,0,0,nWidthSrc,nHeightSrc,maskDC,0,0,SRCAND);

       HDC newMaskDC=CreateCompatibleDC(NULL);

       HBITMAP newMask;

       newMask= CreateBitmap(nWidthDest, nHeightDest, 1,

                                                  GetDeviceCaps(newMaskDC, BITSPIXEL), NULL);if (newMask ==NULL)

       {

              SelectObject(dc, oldBitmap);

              DeleteDC(dc);

              SelectObject(maskDC, oldMask);

              DeleteDC(maskDC);

              DeleteDC(newMaskDC);

              DeleteObject(bitmap);     

              DeleteObject(maskBitmap);return false;

       }

       SetStretchBltMode(newMaskDC, COLORONCOLOR);

       HBITMAP oldNewMask=(HBITMAP) SelectObject(newMaskDC, newMask);

       StretchBlt(newMaskDC,0, 0, nWidthDest, nHeightDest, maskDC, 0, 0,

                    nWidthSrc, nHeightSrc, SRCCOPY);

       SelectObject(maskDC, oldMask);

       DeleteDC(maskDC);

       DeleteObject(maskBitmap);

       HDC newImageDC=CreateCompatibleDC(NULL);

       HBITMAP newImage= CreateBitmap(nWidthDest, nHeightDest, 1,

        GetDeviceCaps(newMaskDC, BITSPIXEL), NULL);if (newImage ==NULL)

       {

              SelectObject(dc, oldBitmap);

              DeleteDC(dc);

              DeleteDC(newMaskDC);

              DeleteObject(bitmap);return false;

       }

       HBITMAP oldNewImage=(HBITMAP)SelectObject(newImageDC, newImage);

       StretchBlt(newImageDC,0, 0, nWidthDest, nHeightDest, dc, 0, 0, nWidthSrc,

              nHeightSrc, SRCCOPY);

       SelectObject(dc, oldBitmap);

       DeleteDC(dc);

       DeleteObject(bitmap);     

       BitBlt( dcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest,

                          newMaskDC,0, 0, SRCAND);

       BitBlt( dcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest,

                       newImageDC,0, 0, SRCPAINT);

       SelectObject(newImageDC, oldNewImage);

       DeleteDC(newImageDC);

       SelectObject(newMaskDC, oldNewMask);

       DeleteDC(newMaskDC);

       DeleteObject(newImage);   

       DeleteObject(newMask);return true;

}

指定掩码图,和掩码图属于不同图片

void DrawTransBitmap( HDC hdcDest,      //目标DC
                    int nXOriginDest,   //目标X偏移
                    int nYOriginDest,   //目标Y偏移
                    int nWidthDest,     //目标宽度
                    int nHeightDest,    //目标高度
                    HDC hdcSrc,         //源DC
HDC hdcMask,int nXOriginSrc,    //源X起点
                    int nYOriginSrc,    //源Y起点
                    COLORREF crTransparent  //透明色,COLORREF类型
)

{



    HBITMAP hOldImageBMP, hImageBMP= CreateCompatibleBitmap(hdcDest, nWidthDest, nHeightDest);    //创建兼容位图
     HDC        hImageDC = CreateCompatibleDC(hdcDest);//临时DC
     hOldImageBMP =(HBITMAP)SelectObject(hImageDC, hImageBMP);//将源DC中的位图拷贝到临时DC中,源DC已经载入位图
     BitBlt(hImageDC, 0, 0, nWidthDest, nHeightDest, hdcSrc, nXOriginSrc, nYOriginSrc, SRCCOPY);//设置临时DC的透明色
SetBkColor(hImageDC, crTransparent);//生成透明区域为黑色，其它区域保持不变的位图
    SetBkColor(hImageDC, RGB(0,0,0));

    SetTextColor(hImageDC, RGB(255,255,255));

    BitBlt(hImageDC,0, 0, nWidthDest, nHeightDest, hdcMask, 0, 0, SRCAND);//透明部分保持屏幕不变，其它部分变成黑色
    SetBkColor(hdcDest,RGB(255,255,255));

    SetTextColor(hdcDest,RGB(0,0,0));

     BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hdcMask,0, 0, SRCAND);//"或"运算,生成最终效果
    BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hImageDC, 0, 0, SRCPAINT);//清理、恢复
SelectObject(hImageDC, hOldImageBMP);

    DeleteDC(hImageDC);

    DeleteObject(hImageBMP);

}//指定图片和掩码图同属于一张图片
void DrawTransBitmap(HDC hDC, int nPosX, int nPosY, int nCX, intnCY, HBITMAP hObj)

{

    HDC hMemDC=CreateCompatibleDC(hDC);

    HBITMAP hOldBMP=(HBITMAP)::SelectObject(hMemDC,hObj);

      BitBlt(hDC,nPosX,nPosY,nCX,nCY,    hMemDC,nCX,0,SRCAND);

    BitBlt(hDC,nPosX,nPosY,nCX,nCY,    hMemDC,0,0,SRCPAINT);

    SelectObject(hMemDC,hOldBMP);

    DeleteDC(hMemDC);



}  



HRGN CreateBitmapRgn(int nWidth,intnHeight,HBITMAP hbmp, COLORREF TransColor)

{

        HDC  hmemDC;//创建与传入DC兼容的临时DC
        hmemDC =::CreateCompatibleDC(NULL);        

        HBITMAP hOldBmp=(HBITMAP)::SelectObject(hmemDC,hbmp);//创建总的窗体区域，初始region为0
HRGN hrgn;

        hrgn= ::CreateRectRgn(0,0,0,0);inty;for(y=0;y<nHeight ;y++)

        {

            HRGN rgnTemp;//保存临时region
            
            int iX = 0;do{//跳过透明色找到下一个非透明色的点.
                while (iX < nWidth  && ::GetPixel(hmemDC,iX, y) ==TransColor)

                    iX++;//记住这个起始点
                int iLeftX =iX;//寻找下个透明色的点
                while (iX < nWidth  && ::GetPixel(hmemDC,iX, y) !=TransColor)++iX;//创建一个包含起点与重点间高为1像素的临时“region”
                rgnTemp=::CreateRectRgn(iLeftX, y, iX, y+1);//合并到主"region".
CombineRgn( hrgn,hrgn,rgnTemp, RGN_OR);//删除临时"region",否则下次创建时和出错
::DeleteObject(rgnTemp);

            }while(iX <nWidth );

            iX= 0;

        }

        ::SelectObject(hmemDC,hOldBmp);

        ::DeleteDC(hmemDC);returnhrgn;   

}

【转载】C++ 轻松实现透明位图(zhuan)

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