Question

麻烦给我解释一下下面一段C#程序是什么意思？

public DiffuseMaterial m_material;
public void SetRGBMaping()
{
WriteableBitmap writeableBitmap = new WriteableBitmap(64, 64, 96, 96, PixelFormats.Bgr24, null);
writeableBitmap.Lock();

unsafe
{
byte* pStart = (byte*)(void*)writeableBitmap.BackBuffer;
int nL = writeableBitmap.BackBufferStride;
for (int r = 0; r < 16; r++)
{
for (int g = 0; g < 16; g++)
{
for (int b = 0; b < 16; b++)
{
int nX = (g % 4) * 16 + b;
int nY = r*4 + (int)(g/4);

*(pStart + nY * nL + nX * 3 + 0) = (byte)(b * 17);
*(pStart + nY * nL + nX * 3 + 1) = (byte)(g * 17);
*(pStart + nY * nL + nX * 3 + 2) = (byte)(r * 17);
}
}
}
}
writeableBitmap.AddDirtyRect(new Int32Rect(0, 0, 64, 64));
writeableBitmap.Unlock();
ImageBrush imageBrush = new ImageBrush(writeableBitmap);
imageBrush.ViewportUnits = BrushMappingMode.Absolute;

m_material = new DiffuseMaterial();
m_material.Brush = imageBrush;
m_bPseudoColor = false;
}

Answer 1

你哪里不懂？
是unsafe块里吗？
C#使用unsafe关键字后，就可以像C++一样使用指针了...但其实不到万不得已C#是不建议这么干的，有风险...

追问

哦哦，那个我还知道，我是刚开始学C#哈，主要是上面关于 writeableBitmap的不太懂

追答

自己谷歌百度一下“WriteableBitmap”吧...这个东西我也没用过...
大致看了一下，这个函数的功能应该就是对一张图像的某些像素的RGB值进行了处理（乘以17）。WriteableBitmap应该就是一个处理图像的类。