/// <summary>
/// Read a heightmap report
/// </summary>
/// <param name="from">Origin</param>
/// <param name="map">Deserialized heightmap</param>
/// <returns>Number of bytes read</returns>
public static int ReadHeightMap(ReadOnlySpan <byte> from, out Heightmap map)
{
HeightMapHeader header = MemoryMarshal.Cast <byte, HeightMapHeader>(from)[0];
map = new Heightmap
{
XMin = header.XMin,
XMax = header.XMax,
XSpacing = header.XSpacing,
YMin = header.YMin,
YMax = header.YMax,
YSpacing = header.YSpacing,
Radius = header.Radius,
NumX = header.NumX,
NumY = header.NumY
};
if (from.Length > Marshal.SizeOf(header))
{
ReadOnlySpan <byte> zCoordinates = from.Slice(Marshal.SizeOf(header), Marshal.SizeOf <float>() * map.NumX * map.NumY);
map.ZCoordinates = MemoryMarshal.Cast <byte, float>(zCoordinates).ToArray();
}
else
{
map.NumX = map.NumY = 0;
map.ZCoordinates = Array.Empty <float>();
}
return(Marshal.SizeOf(header) + map.ZCoordinates.Length * Marshal.SizeOf <float>());
}
/// <summary>
/// Write a heightmap as read by G29 S1
/// </summary>
/// <param name="to">Destination</param>
/// <param name="map">Heightmap to write</param>
/// <returns>Number of bytes written</returns>
public static int WriteHeightMap(Span <byte> to, Heightmap map)
{
HeightMapHeader header = new HeightMapHeader
{
XMin = map.XMin,
XMax = map.XMax,
XSpacing = map.XSpacing,
YMin = map.YMin,
YMax = map.YMax,
YSpacing = map.YSpacing,
Radius = map.Radius,
NumX = (ushort)map.NumX,
NumY = (ushort)map.NumY
};
MemoryMarshal.Write(to, ref header);
Span <float> coords = MemoryMarshal.Cast <byte, float>(to.Slice(Marshal.SizeOf(header)));
for (int i = 0; i < map.NumX * map.NumY; i++)
{
coords[i] = map.ZCoordinates[i];
}
return(Marshal.SizeOf(header) + Marshal.SizeOf <float>() * map.NumX * map.NumY);
}
/// <summary>
/// Read a heightmap report
/// </summary>
/// <param name="from">Origin</param>
/// <param name="map">Deserialized heightmap</param>
/// <returns>Number of bytes read</returns>
public static int ReadHeightMap(ReadOnlySpan <byte> from, out Heightmap map)
{
HeightMapHeader header = MemoryMarshal.Read <HeightMapHeader>(from);
map = new Heightmap
{
XMin = header.XMin,
XMax = header.XMax,
XSpacing = header.XSpacing,
YMin = header.YMin,
YMax = header.YMax,
YSpacing = header.YSpacing,
Radius = header.Radius,
NumX = header.NumX,
NumY = header.NumY
};
int headerSize = Marshal.SizeOf <HeightMapHeader>(), dataLength = Marshal.SizeOf <float>() * map.NumX * map.NumY;
if (from.Length > headerSize)
{
ReadOnlySpan <byte> zCoordinates = from.Slice(headerSize, dataLength);
map.ZCoordinates = MemoryMarshal.Cast <byte, float>(zCoordinates).ToArray();
}
else
{
map.NumX = map.NumY = dataLength = 0;
map.ZCoordinates = Array.Empty <float>();
}
return(headerSize + dataLength);
}
