MFC中去掉bmp图片的背景色

以下代码是本人从网上找的，和大家分享一下^

(note:)这是去掉背景色绘制BMP图片的代码

void TransparentBitmap(HDC hdc, HBITMAP hBitmap, int xStart, int yStart, int xadd , int yadd , COLORREF cTransparentColor) {    

BITMAP   m_bm;   COLORREF   cColor;  

 // 创建临时DC  

 HDC   hMem, hBack, hObject, hTemp, hSave;  

hBack   = CreateCompatibleDC(hdc);  

 hObject = CreateCompatibleDC(hdc);  

hMem   = CreateCompatibleDC(hdc);  

 hSave   = CreateCompatibleDC(hdc);    

 hTemp   = CreateCompatibleDC(hdc);  

// 选入位图

  SelectObject(hTemp, hBitmap);    

GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&m_bm);  

 //显示位图宽高

  POINT     ptSize;   /

/ 取得位图的宽度

  ptSize.x = m_bm.bmWidth;  

  // 取得位图的该度  

ptSize.y = m_bm.bmHeight;    

  // 转换为逻辑点值  

 DPtoLP(hTemp, &ptSize, 1);  

 // 创建临时位图  

 HBITMAP   bmBack, bmObject, bmMem, bmSave;  

// 单色位图

  bmBack   = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL);  

  bmObject = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL);  

 // 与设备兼容位图   bmMem   = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y);  

 bmSave     = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y);  

// 将创建的临时位图选入临时DC中  

HBITMAP   OldbmBack, OldbmObject, OldbmMem, OldbmSave;   OldbmBack   = (HBITMAP)SelectObject(hBack, bmBack);  

OldbmObject = (HBITMAP)SelectObject(hObject, bmObject);  

 OldbmMem   = (HBITMAP)SelectObject(hMem, bmMem);  

OldbmSave   = (HBITMAP)SelectObject(hSave, bmSave);  

// 设置映射模式  

 SetMapMode(hTemp, GetMapMode(hdc));  

// 先保留原始位图  

 BitBlt(hSave, 0, 0, ptSize.x, ptSize.y, hTemp, 0, 0, SRCCOPY);  

// 将背景颜色设置为需透明的颜色  

 cColor = SetBkColor(hTemp, cTransparentColor);  

 // 创建目标屏蔽码

  BitBlt(hObject, 0, 0, ptSize.x, ptSize.y, hTemp, 0, 0, SRCCOPY);  

// 恢复源DC的原始背景色  

SetBkColor(hTemp, cColor);  

// 创建反转的目标屏蔽码  

BitBlt(hBack, 0, 0, ptSize.x, ptSize.y, hObject, 0, 0, NOTSRCCOPY);  

 // 拷贝主DC的背景到目标DC  

 BitBlt(hMem, 0, 0, ptSize.x, ptSize.y, hdc, xStart, yStart, SRCCOPY);  

 // 屏蔽位图的显示区  

BitBlt(hMem, 0, 0, ptSize.x, ptSize.y, hObject, 0, 0, SRCAND);  

 // 屏蔽位图中的透明色  

BitBlt(hTemp, 0, 0, ptSize.x, ptSize.y, hBack, 0, 0, SRCAND);  

// 将位图与目标DC的背景左异或操作  

 BitBlt(hMem, 0, 0, ptSize.x, ptSize.y, hTemp, 0, 0, SRCPAINT);  

// 拷贝目标到屏幕上  

StretchBlt(hdc, xStart, yStart, ptSize.x+xadd, ptSize.y+yadd, hMem, 0, 0, ptSize.x, ptSize.y,SRCCOPY);  

// 恢复原始位图  

BitBlt(hTemp, 0, 0, ptSize.x, ptSize.y, hSave, 0, 0, SRCCOPY);  

 // 删除临时内存位图  

DeleteObject(SelectObject(hBack, OldbmBack));  

 DeleteObject(SelectObject(hObject, OldbmObject));  

DeleteObject(SelectObject(hMem, OldbmMem));  

 DeleteObject(SelectObject(hSave, OldbmSave));

// 删除临时内存DC  

DeleteDC(hMem);  

eleteDC(hBack);  

eleteDC(hObject);  

DeleteDC(hSave);  

 DeleteDC(hTemp); }