bmp单色位图抗锯齿算法MFC代码实现

以下是一个简单的MFC程序实现bmp单色位图抗锯齿算法的代码示例：

1. 定义位图数据结构：

typedef struct tagBITMAPINFO_MONOCHROME {
    BITMAPINFOHEADER bmiHeader;
    RGBQUAD bmiColors[2];
} BITMAPINFO_MONOCHROME;

2. 载入位图文件：

CBitmap bitmap;
bitmap.LoadBitmap(IDB_BITMAP1);

3. 将位图数据转换为单色位图数据：

CDC dc;
dc.CreateCompatibleDC(NULL);
dc.SelectObject(&bitmap);

BITMAP bmp;
bitmap.GetBitmap(&bmp);

BITMAPINFO_MONOCHROME bmi;
memset(&bmi, 0, sizeof(bmi));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = bmp.bmWidth;
bmi.bmiHeader.biHeight = bmp.bmHeight;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 1;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = ((bmp.bmWidth + 31) / 32) * 4 * bmp.bmHeight;
bmi.bmiColors[0].rgbBlue = bmi.bmiColors[0].rgbGreen = bmi.bmiColors[0].rgbRed = 0;
bmi.bmiColors[1].rgbBlue = bmi.bmiColors[1].rgbGreen = bmi.bmiColors[1].rgbRed = 255;

BYTE* pBits = NULL;
HBITMAP hBitmap = CreateDIBSection(dc.GetSafeHdc(), (BITMAPINFO*)&bmi, DIB_RGB_COLORS, (void**)&pBits, NULL, 0);
dc.SelectObject(hBitmap);

::GetDIBits(dc.GetSafeHdc(), (HBITMAP)bitmap, 0, bmp.bmHeight, pBits, (BITMAPINFO*)&bmi, DIB_RGB_COLORS);

4. 对单色位图进行抗锯齿处理：

for (int y = 0; y < bmi.bmiHeader.biHeight; y++) {
    for (int x = 0; x < bmi.bmiHeader.biWidth; x++) {
        int index = y * ((bmi.bmiHeader.biWidth + 31) / 32) + x / 32;
        int bit = 1 << (31 - x % 32);

        if (pBits[index] & bit) {
            if ((x > 0 && !(pBits[index] & (bit >> 1))) ||
                (x < bmi.bmiHeader.biWidth - 1 && !(pBits[index] & (bit << 1))) ||
                (y > 0 && !(pBits[index - ((bmi.bmiHeader.biWidth + 31) / 32)] & bit)) ||
                (y < bmi.bmiHeader.biHeight - 1 && !(pBits[index + ((bmi.bmiHeader.biWidth + 31) / 32)] & bit))) {
                pBits[index] &= ~bit;
            }
        }
    }
}

5. 绘制抗锯齿处理后的单色位图：

CClientDC dc(this);
dc.StretchBlt(0, 0, bmp.bmWidth, bmp.bmHeight, CDC::FromHandle(dcMemory), 0, 0, bmp.bmWidth, bmp.bmHeight, SRCCOPY);

完整的MFC程序代码示例：

typedef struct tagBITMAPINFO_MONOCHROME {
    BITMAPINFOHEADER bmiHeader;
    RGBQUAD bmiColors[2];
} BITMAPINFO_MONOCHROME;

void AntiAliasingMonochromeBitmap(CDC* pDC, HBITMAP hBitmap, int cx, int cy)
{
    CDC dcMemory;
    dcMemory.CreateCompatibleDC(pDC);
    dcMemory.SelectObject(hBitmap);

    BITMAP bmp;
    ::GetObject(hBitmap, sizeof(BITMAP), &bmp);

    BITMAPINFO_MONOCHROME bmi;
    memset(&bmi, 0, sizeof(bmi));
    bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth = bmp.bmWidth;
    bmi.bmiHeader.biHeight = bmp.bmHeight;
    bmi.bmiHeader.biPlanes = 1;
    bmi.bmiHeader.biBitCount = 1;
    bmi.bmiHeader.biCompression = BI_RGB;
    bmi.bmiHeader.biSizeImage = ((bmp.bmWidth + 31) / 32) * 4 * bmp.bmHeight;
    bmi.bmiColors[0].rgbBlue = bmi.bmiColors[0].rgbGreen = bmi.bmiColors[0].rgbRed = 0;
    bmi.bmiColors[1].rgbBlue = bmi.bmiColors[1].rgbGreen = bmi.bmiColors[1].rgbRed = 255;

    BYTE* pBits = NULL;
    HBITMAP hBitmapMono = CreateDIBSection(dcMemory.GetSafeHdc(), (BITMAPINFO*)&bmi, DIB_RGB_COLORS, (void**)&pBits, NULL, 0);
    dcMemory.SelectObject(hBitmapMono);

    ::GetDIBits(dcMemory.GetSafeHdc(), hBitmap, 0, bmp.bmHeight, pBits, (BITMAPINFO*)&bmi, DIB_RGB_COLORS);

    for (int y = 0; y < bmi.bmiHeader.biHeight; y++) {
        for (int x = 0; x < bmi.bmiHeader.biWidth; x++) {
            int index = y * ((bmi.bmiHeader.biWidth + 31) / 32) + x / 32;
            int bit = 1 << (31 - x % 32);

            if (pBits[index] & bit) {
                if ((x > 0 && !(pBits[index] & (bit >> 1))) ||
                    (x < bmi.bmiHeader.biWidth - 1 && !(pBits[index] & (bit << 1))) ||
                    (y > 0 && !(pBits[index - ((bmi.bmiHeader.biWidth + 31) / 32)] & bit)) ||
                    (y < bmi.bmiHeader.biHeight - 1 && !(pBits[index + ((bmi.bmiHeader.biWidth + 31) / 32)] & bit))) {
                    pBits[index] &= ~bit;
                }
            }
        }
    }

    pDC->StretchBlt(0, 0, cx, cy, &dcMemory, 0, 0, bmp.bmWidth, bmp.bmHeight, SRCCOPY);
}

void CTestDlg::OnPaint()
{
    CPaintDC dc(this);

    CBitmap bitmap;
    bitmap.LoadBitmap(IDB_BITMAP1);

    AntiAliasingMonochromeBitmap(&dc, (HBITMAP)bitmap, 200, 200);
}