彩色ICON生成灰色ICON

最新推荐文章于 2024-03-24 17:27:38 发布

转载最新推荐文章于 2024-03-24 17:27:38 发布 · 1.1k 阅读

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本文介绍了一种通过编程方式将彩色图标转换为灰度图标的实现方法。该方法使用了Windows API函数，并通过逐像素计算灰度值来生成新的灰度图标。

// 由彩色ICON生成灰色ICON
HICON CreateGrayscaleIcon(HICON hIcon)
{
 HICON  hGrayIcon = NULL;
 HDC   hMainDC = NULL, hMemDC1 = NULL, hMemDC2 = NULL;
 BITMAP  bmp;
 HBITMAP  hOldBmp1 = NULL, hOldBmp2 = NULL;
 ICONINFO csII, csGrayII;
 BOOL  bRetValue = FALSE;

 bRetValue = ::GetIconInfo(hIcon, &csII);
 if (bRetValue == FALSE) return NULL;

 hMainDC = ::GetDC(NULL);
 hMemDC1 = ::CreateCompatibleDC(hMainDC);
 hMemDC2 = ::CreateCompatibleDC(hMainDC);
 if (hMainDC == NULL || hMemDC1 == NULL || hMemDC2 == NULL) return NULL;
 
 if (::GetObject(csII.hbmColor, sizeof(BITMAP), &bmp))
 {
  DWORD dwWidth = csII.xHotspot*2;
  DWORD dwHeight = csII.yHotspot*2;

  csGrayII.hbmColor = ::CreateBitmap(dwWidth, dwHeight, bmp.bmPlanes, bmp.bmBitsPixel, NULL);
  if (csGrayII.hbmColor)
  {
   hOldBmp1 = (HBITMAP)::SelectObject(hMemDC1, csII.hbmColor);
   hOldBmp2 = (HBITMAP)::SelectObject(hMemDC2, csGrayII.hbmColor);

   //::BitBlt(hMemDC2, 0, 0, dwWidth, dwHeight, hMemDC1, 0, 0, SRCCOPY);

   DWORD  dwLoopY = 0, dwLoopX = 0;
   COLORREF crPixel = 0;
   BYTE  byNewPixel = 0;

   for (dwLoopY = 0; dwLoopY < dwHeight; dwLoopY++)
   {
    for (dwLoopX = 0; dwLoopX < dwWidth; dwLoopX++)
    {
     crPixel = ::GetPixel(hMemDC1, dwLoopX, dwLoopY);

     byNewPixel = (BYTE)((GetRValue(crPixel) * 0.299) + (GetGValue(crPixel) * 0.587) + (GetBValue(crPixel) * 0.114));
     if (crPixel) ::SetPixel(hMemDC2, dwLoopX, dwLoopY, RGB(byNewPixel, byNewPixel, byNewPixel));
    } // for
   } // for

   ::SelectObject(hMemDC1, hOldBmp1);
   ::SelectObject(hMemDC2, hOldBmp2);

   csGrayII.hbmMask = csII.hbmMask;

   csGrayII.fIcon = TRUE;
   hGrayIcon = ::CreateIconIndirect(&csGrayII);
  } // if

  ::DeleteObject(csGrayII.hbmColor);
  //::DeleteObject(csGrayII.hbmMask);
 } // if

 ::DeleteObject(csII.hbmColor);
 ::DeleteObject(csII.hbmMask);
 ::DeleteDC(hMemDC1);
 ::DeleteDC(hMemDC2);
 ::ReleaseDC(NULL, hMainDC);

 return hGrayIcon;
} // End of CreateGrayscaleIcon

// 应用

m_hColorIcon = (HICON)::LoadImage(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDI_NOTEBOOK), IMAGE_ICON, 0, 0, 0);

m_hGrayIcon = CreateGrayscaleIcon(m_hColorIcon);