帮我用c++和mfc写图像旋转函数void RotaDIB(LPSTR lpSrcStartBits, LONG lSrcWidth, LONG lSrcHeight, int Roat)

好的，我会帮您实现这个图像旋转函数。下面是具体的代码实现：

void RotaDIB(LPSTR lpSrcStartBits, LONG lSrcWidth, LONG lSrcHeight, int Roat)
{
    if (nullptr == lpSrcStartBits || lSrcWidth <= 0 || lSrcHeight <= 0) {
        return;
    }

    // 计算旋转后的图像宽度和高度
    double dRotate = (double)Roat * PI / 180;
    double dSin = fabs(sin(dRotate));
    double dCos = fabs(cos(dRotate));
    LONG lNewWidth = (LONG)(lSrcWidth * dCos + lSrcHeight * dSin);
    LONG lNewHeight = (LONG)(lSrcWidth * dSin + lSrcHeight * dCos);

    // 申请新图像内存
    LPSTR lpNewBits = new char[lNewWidth * lNewHeight * 4];
    memset(lpNewBits, 0, lNewWidth * lNewHeight * 4);

    // 计算旋转中心点
    LONG lSrcMidX = lSrcWidth / 2;
    LONG lSrcMidY = lSrcHeight / 2;
    LONG lNewMidX = lNewWidth / 2;
    LONG lNewMidY = lNewHeight / 2;

    // 逐像素旋转
    for (LONG y = 0; y < lSrcHeight; y++) {
        for (LONG x = 0; x < lSrcWidth; x++) {
            // 计算旋转后的像素坐标
            LONG lNewX = (LONG)((x - lSrcMidX) * dCos + (y - lSrcMidY) * dSin + lNewMidX);
            LONG lNewY = (LONG)((x - lSrcMidX) * dSin + (y - lSrcMidY) * dCos + lNewMidY);

            // 判断新坐标是否在图像范围内
            if (lNewX >= 0 && lNewX < lNewWidth && lNewY >= 0 && lNewY < lNewHeight) {
                // 获取旧像素值
                LONG lSrcPos = (y * lSrcWidth + x) * 4;
                BYTE bRed = lpSrcStartBits[lSrcPos + 2];
                BYTE bGreen = lpSrcStartBits[lSrcPos + 1];
                BYTE bBlue = lpSrcStartBits[lSrcPos];
                BYTE bAlpha = lpSrcStartBits[lSrcPos + 3];

                // 设置新像素值
                LONG lNewPos = (lNewY * lNewWidth + lNewX) * 4;
                lpNewBits[lNewPos + 2] = bRed;
                lpNewBits[lNewPos + 1] = bGreen;
                lpNewBits[lNewPos] = bBlue;
                lpNewBits[lNewPos + 3] = bAlpha;
            }
        }
    }

    // 释放旧图像内存
    delete[] lpSrcStartBits;

    // 更新图像宽度和高度
    lSrcWidth = lNewWidth;
    lSrcHeight = lNewHeight;

    // 拷贝新图像到旧图像
    lpSrcStartBits = new char[lSrcWidth * lSrcHeight * 4];
    memcpy(lpSrcStartBits, lpNewBits, lSrcWidth * lSrcHeight * 4);

    // 释放新图像内存
    delete[] lpNewBits;
}

这个函数中，我们首先计算旋转后的图像宽度和高度，然后申请新的内存空间，逐像素旋转，最后更新宽度和高度，并将新的像素数据拷贝到旧的内存空间中。注意，这个函数只是对图像进行旋转，并没有对图像进行任何的缩放操作。