private static unsafe void LoadOrSaveSurfaceRegion(Stream stream, Surface surface, RectInt32[] scans, bool trueForSave)
{
int length = scans.Length;
if (length != 0)
{
void *[] voidPtrArray;
ulong[] numArray;
RectInt32 b = surface.Bounds <ColorBgra>();
RectInt32 bounds = RectInt32.Intersect(scans.Bounds(), b);
int num5 = 0;
long num6 = (bounds.Width * bounds.Height) * 4L;
if (((length == 1) && (num6 <= 0xffffffffL)) && surface.IsContiguousMemoryRegion(bounds))
{
voidPtrArray = new void *[] { surface.GetPointAddressUnchecked(bounds.Location.ToGdipPoint()) };
numArray = new ulong[] { num6 };
}
else
{
for (int i = 0; i < length; i++)
{
RectInt32 num9 = RectInt32.Intersect(scans[i], b);
if ((num9.Width != 0) && (num9.Height != 0))
{
num5 += num9.Height;
}
}
int index = 0;
voidPtrArray = new void *[num5];
numArray = new ulong[num5];
for (int j = 0; j < length; j++)
{
RectInt32 num11 = RectInt32.Intersect(scans[j], b);
if ((num11.Width != 0) && (num11.Height != 0))
{
for (int k = num11.Y; k < (num11.Y + num11.Height); k++)
{
voidPtrArray[index] = (void *)surface.GetPointAddress(num11.X, k);
numArray[index] = (ulong)(num11.Width * 4L);
index++;
}
}
}
}
if (trueForSave)
{
WriteToStreamGather(stream, voidPtrArray, numArray);
}
else
{
ReadFromStreamScatter(stream, voidPtrArray, numArray);
}
}
}
