private static DemTile Decode(Stream input)
{
// read meta info
byte[] b = new byte[4 * sizeof(int)];
input.Read(b, 0, b.Length);
int width = BitConverter.ToInt32(b, 0);
if (width < 1 || width > 1000)
return null;
int height = BitConverter.ToInt32(b, sizeof(int));
if (height < 1 || height > 1000)
return null;
int avg = BitConverter.ToInt32(b, 2 * sizeof(int));
if (avg < short.MinValue || avg > short.MaxValue)
return null;
int length = BitConverter.ToInt32(b, 3 * sizeof(int));
if (length < 0 || length > 200000)
return null;
// read compressed data
byte[] data = new byte[length];
int offset = 0;
while (offset < length)
{
int actual = input.Read(data, offset, length - offset);
if (actual <= 0 || actual > length - offset)
{
return null;
}
offset += actual;
}
short[,] pixels = new HDPhotoDecoder().Decode(data);
if (pixels == null)
{
return null;
}
try
{
// read error-corrections
BitReader r = new BitReader(input);
for (int row = 0; row < height; row++)
for (int col = 0; col < width; col++)
if ((row & 0xF) == 0 || (col & 0xF) == 0)
{
// offset = row * width + col;
short err = ReadUnaryCorrection(r);
pixels[row, col] += err;
}
}
catch (EndOfStreamException)
{
return null;
}
// create tile
for (int row = 0; row < height; row++)
for (int col = 0; col < width; col++)
pixels[row, col] += (short)avg;
DemTile tile = new DemTile(pixels);
return tile;
}
private bool LoadDemData()
{
if (!demFileExists)
{
return CreateDemFromParent();
}
bool useFloat = false;
FileInfo fi = new FileInfo(DemFilename);
if (dataset.Projection == ProjectionType.Mercator)
{
using (Stream demStream = File.Open(DemFilename, FileMode.Open))
{
hdTile = DemCodec.Decompress(demStream);
demStream.Close();
}
}
if (hdTile != null)
{
isHdTile = true;
DemData = new double[demSize];
int yh = 0;
for (int yl = 0; yl < 33; yl++)
{
int xh = 0;
for (int xl = 0; xl < 33; xl++)
{
int indexI = xl + (32-yl) * 33;
DemData[indexI] = hdTile.AltitudeInMeters(yh, xh);
demAverage += DemData[indexI];
xh += 8;
}
yh += 8;
}
demAverage /= DemData.Length;
return true;
}
if (fi.Length != 2178 && fi.Length != 1026 && fi.Length != 4356 && fi.Length != 2052)
{
return CreateDemFromParent();
}
if (fi.Length == 4356 || fi.Length == 2052)
{
useFloat = true;
}
FileStream fs = null;
BinaryReader br = null;
try
{
fs = new FileStream(DemFilename, FileMode.Open);
br = new BinaryReader(fs);
demAverage = 0;
DemData = new double[demSize];
Byte[] part = new Byte[4];
for (int i = 0; i < DemData.Length; i++)
{
if (useFloat)
{
DemData[i] = br.ReadSingle();
if (Double.IsNaN(DemData[i]))
{
DemData[i] = demAverage;
}
}
else
{
DemData[i] = br.ReadInt16();
}
demAverage += DemData[i];
}
demAverage /= DemData.Length;
return true;
}
catch
{
if (File.Exists(DemFilename))
{
File.Delete(DemFilename);
}
DemReady = false;
return false;
}
finally
{
if (br != null)
{
br.Close();
}
else if (fs != null)
{
fs.Close();
}
}
}
private static DemTile Decode(Stream input)
{
// read meta info
byte[] b = new byte[4 * sizeof(int)];
input.Read(b, 0, b.Length);
int width = BitConverter.ToInt32(b, 0);
if (width < 1 || width > 1000)
{
return(null);
}
int height = BitConverter.ToInt32(b, sizeof(int));
if (height < 1 || height > 1000)
{
return(null);
}
int avg = BitConverter.ToInt32(b, 2 * sizeof(int));
if (avg < short.MinValue || avg > short.MaxValue)
{
return(null);
}
int length = BitConverter.ToInt32(b, 3 * sizeof(int));
if (length < 0 || length > 200000)
{
return(null);
}
// read compressed data
byte[] data = new byte[length];
int offset = 0;
while (offset < length)
{
int actual = input.Read(data, offset, length - offset);
if (actual <= 0 || actual > length - offset)
{
return(null);
}
offset += actual;
}
short[,] pixels = new HDPhotoDecoder().Decode(data);
if (pixels == null)
{
return(null);
}
try
{
// read error-corrections
BitReader r = new BitReader(input);
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
if ((row & 0xF) == 0 || (col & 0xF) == 0)
{
// offset = row * width + col;
short err = ReadUnaryCorrection(r);
pixels[row, col] += err;
}
}
}
}
catch (EndOfStreamException)
{
return(null);
}
// create tile
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
pixels[row, col] += (short)avg;
}
}
DemTile tile = new DemTile(pixels);
return(tile);
}
public virtual void CleanUp(bool removeFromParent)
{
ReadyToRender = false;
TextureReady = false;
DemData = null;
DemReady = false;
hdTile = null;
if (this.texture != null)
{
if (Earth3d.Logging) { Earth3d.WriteLogMessage("Tile:Texture Cleanup"); }
BufferPool11.ReturnTexture(texture);
this.texture = null;
}
else
{
if (Earth3d.Logging) { Earth3d.WriteLogMessage("Tile:Cleanup - no Texture"); }
}
if (this.vertexBuffer != null)
{
BufferPool11.ReturnPNTX2VertexBuffer(vertexBuffer);
this.vertexBuffer = null;
}
if (this.indexBuffer != null)
{
foreach (IndexBuffer11 buffer in indexBuffer)
{
if (buffer != null)
{
BufferPool11.ReturnShortIndexBuffer(buffer);
}
}
this.indexBuffer = null;
}
}
