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//创建内存DC// CDC memdc; CBitmap bmp,*pOldBitmap; memdc.CreateCompatibleDC(dc); bmp.CreateCompatibleBitmap(dc,rect.Width(),rect.Height()); pOldBitmap = memdc.SelectObject(&bmp); CRect memRect(CPoint(0,0),rect.Size()); memdc.FillSolidRect(memRect,vec4b2Color(vecbackGroundColor)); BLENDFUNCTION bf; bf.BlendOp = AC_SRC_OVER; bf.BlendFlags = 0; bf.SourceConstantAlpha = vecbackGroundColor[3]; bf.AlphaFormat = 0; dc->AlphaBlend( rect.left,rect.top,rect.Width(),rect.Height(), &memdc, memRect.left,memRect.top,memRect.Width(),memRect.Height(),bf); //清理内存DC/// memdc.SelectObject(pOldBitmap); DeleteDC(memdc);DeleteObject(bmp);
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