bmp单色位图抗锯齿算法MFC代码实现

以下是一个简单的MFC代码实现，用于对单色位图进行抗锯齿处理：

void CAntiAliasDlg::OnBnClickedBtnAntiAlias()
{
CDC* pDC = GetDC();
CDC dcMem;
dcMem.CreateCompatibleDC(pDC);

CBitmap bmpSrc, bmpDest;
bmpSrc.LoadBitmap(IDB_BITMAP_SRC);

BITMAP bm;
bmpSrc.GetBitmap(&bm);

bmpDest.CreateBitmap(bm.bmWidth, bm.bmHeight, 1, 1, NULL);

CBitmap* pOldBitmap = dcMem.SelectObject(&bmpSrc);

for (int y = 0; y < bm.bmHeight; y++)
{
for (int x = 0; x < bm.bmWidth; x++)
{
COLORREF colorSrc = dcMem.GetPixel(x, y);

int r = GetRValue(colorSrc);
int g = GetGValue(colorSrc);
int b = GetBValue(colorSrc);

COLORREF colorDest = RGB(r, g, b);

if (x > 0 && x < bm.bmWidth - 1 && y > 0 && y < bm.bmHeight - 1)
{
COLORREF color1 = dcMem.GetPixel(x - 1, y - 1);
COLORREF color2 = dcMem.GetPixel(x, y - 1);
COLORREF color3 = dcMem.GetPixel(x + 1, y - 1);
COLORREF color4 = dcMem.GetPixel(x - 1, y);
COLORREF color5 = dcMem.GetPixel(x + 1, y);
COLORREF color6 = dcMem.GetPixel(x - 1, y + 1);
COLORREF color7 = dcMem.GetPixel(x, y + 1);
COLORREF color8 = dcMem.GetPixel(x + 1, y + 1);

int r1 = GetRValue(color1);
int g1 = GetGValue(color1);
int b1 = GetBValue(color1);
int r2 = GetRValue(color2);
int g2 = GetGValue(color2);
int b2 = GetBValue(color2);
int r3 = GetRValue(color3);
int g3 = GetGValue(color3);
int b3 = GetBValue(color3);
int r4 = GetRValue(color4);
int g4 = GetGValue(color4);
int b4 = GetBValue(color4);
int r5 = GetRValue(color5);
int g5 = GetGValue(color5);
int b5 = GetBValue(color5);
int r6 = GetRValue(color6);
int g6 = GetGValue(color6);
int b6 = GetBValue(color6);
int r7 = GetRValue(color7);
int g7 = GetGValue(color7);
int b7 = GetBValue(color7);
int r8 = GetRValue(color8);
int g8 = GetGValue(color8);
int b8 = GetBValue(color8);

r = (r1 + r2 + r3 + r4 + r5 + r6 + r7 + r8 + r) / 9;
g = (g1 + g2 + g3 + g4 + g5 + g6 + g7 + g8 + g) / 9;
b = (b1 + b2 + b3 + b4 + b5 + b6 + b7 + b8 + b) / 9;

colorDest = RGB(r, g, b);
}

bmpDest.SetPixel(x, y, colorDest);
}
}

dcMem.SelectObject(pOldBitmap);

CBitmap* pOldBitmap2 = pDC->SelectObject(&bmpDest);
pDC->BitBlt(0, 0, bm.bmWidth, bm.bmHeight, &dcMem, 0, 0, SRCCOPY);
pDC->SelectObject(pOldBitmap2);

ReleaseDC(pDC);
}