huangyhg

void CMyDlg::AlphaBlend(CDC *pDC, double blend)
{
BITMAP bmpX,bmpY;

CBitmap bmp1,bmp2;
bmp2.LoadBitmap(IDB_BITMAP2);
bmp1.LoadBitmap(IDB_BITMAP1);

bmp1.GetBitmap(&bmpX);
UINT* bmpBuffer=(UINT*) GlobalAlloc(GPTR,
bmpX.bmWidthBytes * bmpX.bmHeight);
bmp1.GetBitmapBits(bmpX.bmWidthBytes * bmpX.bmHeight, bmpBuffer);

bmp2.GetBitmap(&bmpY);
UINT* bmpBuffer2=(UINT*) GlobalAlloc(GPTR,
bmpY.bmWidthBytes * bmpY.bmHeight);
bmp2.GetBitmapBits(bmpY.bmWidthBytes * bmpY.bmHeight, bmpBuffer2);

int nSize = bmpY.bmWidth * bmpY.bmHeight;

for (int i = 0; i < nSize; i++)
{
int abR = (int) (GetR(bmpBuffer[i]) * blend +
(1-blend) * GetR(bmpBuffer2[i]));
int abG = (int) (GetG(bmpBuffer[i]) * blend +
(1-blend) * GetG(bmpBuffer2[i]));
int abB = (int) (GetB(bmpBuffer[i]) * blend +
(1-blend) * GetB(bmpBuffer2[i]));

bmpBuffer2[i] = RGB(abB, abG, abR);
}

bmp2.SetBitmapBits(bmpX.bmWidthBytes * bmpX.bmHeight, bmpBuffer2);

CDC memdc;
memdc.CreateCompatibleDC(pDC);
memdc.SelectObject(bmp2);
pDC->BitBlt(10,10,bmpX.bmWidthBytes,
bmpX.bmHeight, &memdc, 0, 0, SRCCOPY);

GlobalFree((HGLOBAL)bmpBuffer);
GlobalFree((HGLOBAL)bmpBuffer2);
memdc.DeleteDC();
}

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/DonJikn/archiv...02/3858454.aspx

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