/// <devdoc>
/// Copy the native GDI+ EncoderParameters data from a chunk of memory into a managed EncoderParameters object.
/// See ConvertToMemory for more info.
/// </devdoc>
internal static EncoderParameters ConvertFromMemory(IntPtr memory)
{
if (memory == IntPtr.Zero)
{
throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter);
}
int count = Marshal.ReadIntPtr(memory).ToInt32();
EncoderParameters p = new EncoderParameters(count);
int size = Marshal.SizeOf(typeof(EncoderParameter));
long arrayOffset = (long)memory + Marshal.SizeOf(typeof(IntPtr));
for (int i = 0; i < count; i++)
{
Guid guid = (Guid)UnsafeNativeMethods.PtrToStructure((IntPtr)(i * size + arrayOffset), typeof(Guid));
int numberOfValues = Marshal.ReadInt32((IntPtr)(i * size + arrayOffset + 16));
EncoderParameterValueType type = (EncoderParameterValueType)Marshal.ReadInt32((IntPtr)(i * size + arrayOffset + 20));
IntPtr value = Marshal.ReadIntPtr((IntPtr)(i * size + arrayOffset + 24));
p._param[i] = new EncoderParameter(new Encoder(guid), numberOfValues, type, value);
}
return(p);
}
private int _GetPointId(IntPtr pointCloudHandle, int index)
{
IntPtr pointCloudIdsHandle = IntPtr.Zero;
ExternApi.ArPointCloud_getPointIds(m_NativeSession.SessionHandle, pointCloudHandle,
ref pointCloudIdsHandle);
IntPtr pointIdHandle = new IntPtr(pointCloudIdsHandle.ToInt64() + (Marshal.SizeOf(typeof(int)) * index));
return(Marshal.ReadInt32(pointIdHandle));
}
public static void Write(this IStream stream, byte[] pv, int cb, out int pcbWritten)
{
var pcbWrittenPtr = Marshal.AllocCoTaskMem(4);
try
{
stream.Read(pv, cb, pcbWrittenPtr);
pcbWritten = Marshal.ReadInt32(pcbWrittenPtr);
}
finally
{
Marshal.FreeCoTaskMem(pcbWrittenPtr);
}
}
