VC++ CImage抠图

void SetBackgroundMaskImage(LPCTSTR lpszImageName)
{
	COLORREF crAlpha = RGB(255, 0, 0);
	CImage img; img.Load(lpszImageName);

	if (img.IsNull())
		return;

	struct PixelData
	{
		BYTE B;
		BYTE G;
		BYTE R;
		BYTE A;
	};

	HRGN hRgn = NULL;
	#define ALLOC_UNIT	200
	DWORD maxRects = ALLOC_UNIT;
	HANDLE hData = GlobalAlloc(GMEM_MOVEABLE, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects));
	RGNDATA *pData = (RGNDATA *)GlobalLock(hData);
	pData->rdh.dwSize = sizeof(RGNDATAHEADER);
	pData->rdh.iType = RDH_RECTANGLES;
	pData->rdh.nCount = pData->rdh.nRgnSize = 0;
	SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
	for (int y = 0; y < img.GetHeight(); y++)
	{
		for (int x = 0; x < img.GetWidth(); x++)
		{
			int x0 = x;
			while (x < img.GetWidth())
			{
				PixelData* pPixel = (PixelData*)img.GetPixelAddress(x, y);
				if (pPixel->R != GetRValue(crAlpha) || pPixel->G != GetGValue(crAlpha) || pPixel->B != GetBValue(crAlpha))
					//if (pPixel->A == 0)
					break;

				x++;
			}

			if (x > x0)
			{
				if (pData->rdh.nCount >= maxRects)
				{
					GlobalUnlock(hData);
					maxRects += ALLOC_UNIT;
					hData = GlobalReAlloc(hData, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), GMEM_MOVEABLE);
					pData = (RGNDATA *)GlobalLock(hData);
				}

				RECT *pRc = (RECT *)&pData->Buffer;
				SetRect(&pRc[pData->rdh.nCount], x0, y, x, y + 1);
				if (x0 < pData->rdh.rcBound.left)
					pData->rdh.rcBound.left = x0;
				if (y < pData->rdh.rcBound.top)
					pData->rdh.rcBound.top = y;
				if (x > pData->rdh.rcBound.right)
					pData->rdh.rcBound.right = x;
				if (y + 1 > pData->rdh.rcBound.bottom)
					pData->rdh.rcBound.bottom = y + 1;
				pData->rdh.nCount++;

				if (pData->rdh.nCount == 500)
				{
					HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData);
					if (hRgn)
					{
						CombineRgn(hRgn, hRgn, h, RGN_OR);
						DeleteObject(h);
					}
					else
						hRgn = h;
					pData->rdh.nCount = 0;
					SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
				}
			}
		}
	}

	HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData);
	if (hRgn)
	{
		CombineRgn(hRgn, hRgn, h, RGN_OR);
		DeleteObject(h);
	}
	else
		hRgn = h;
	pData->rdh.nCount = 0;
	GlobalUnlock(hData);
	GlobalFree(hData);

	::SetWindowRgn(m_hWnd, hRgn, TRUE);
}

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