괴짜 프로그래머의 일상사~@@ - 그레이스케일 아이콘 만들기

그레이스케일 아이콘 만들기 :: 2006/03/10 18:40

코드 프로젝트 받은 소스 분석하다 잼써서 올려봅니당...

// This function creates a grayscale icon starting from a given icon.
// The resulting icon will have the same size of the original one.
//
// Parameters:
//        [IN]    hIcon
//                Handle to the original icon.
//
// Return value:
//        If the function succeeds, the return value is the handle 
//        to the newly created grayscale icon.
//        If the function fails, the return value is NULL.
//
// Updates:
//        26/Nov/2002    Restored 1 BitBlt operation
//        03/May/2002    Removed dependancy from m_hWnd
//                    Removed 1 BitBlt operation
//
HICON CButtonST::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);

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));
                    else
                        ::SetPixel(hMemDC2, dwLoopX, dwLoopY, crPixel);
                } // 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

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