private void hfzWriteTile(ref EndianBinaryWriter writer, HfzHeader fh, HfzTile tile)
{
List<float> pTileData = tile.tileData;
Int32 i=0, TempInt, FirstVal;
float f, HFmin, HFmax, VertScale, VertOffset;
sbyte c;
short s;
UInt32 nx = fh.nx;
UInt32 ny = fh.ny;
UInt32 TileSize = fh.TileSize;
float Precis = fh.Precis;
// get min/max alt in block (used for vert scale)
HFmin = 0;
HFmax = 0;
Epsilon epsilon = new Epsilon(1E-3);
for (i = 0; i < pTileData.Count; i++)
{
// find max diff in line
f = pTileData.ElementAt(i);
if (i == 0)
{
HFmin = HFmax = f;
}
else
{
if (RealExtensions.LT(f, HFmin, epsilon))
{
HFmin = f;
}
if (RealExtensions.GT(f, HFmax, epsilon))
{
HFmax = f;
}
}
}
// number of int levels required for this block
float BlockLevels = ((HFmax - HFmin) / Precis) + 1;
// calc scale
VertScale = (HFmax - HFmin) / BlockLevels;
VertOffset = HFmin;
if (RealExtensions.LE(VertScale, 0, epsilon))
{
VertScale = 1.0f; // this is for niceness
}
writer.Write(VertScale);
writer.Write(VertOffset);
// determine number of blocks
Int32 nBlocksX = ((int)fh.nx / fh.TileSize) - 1; // -1 due to index starting at 0
Int32 exBlocksX = -1;
Int32 nBlocksY = ((int)fh.ny / fh.TileSize) - 1; // -1 due to index starting at 0
Int32 exBlocksY = -1;
if (fh.nx % fh.TileSize > 0)
{
exBlocksX = nBlocksX + 1;
}
if (fh.ny % fh.TileSize > 0)
{
exBlocksY = nBlocksY + 1;
}
UInt32 rows = TileSize;
if(tile.x != exBlocksX && tile.y == exBlocksY || tile.x == exBlocksX && tile.y == exBlocksY)
{
rows = (uint)(TileSize - (((exBlocksY+1) * TileSize) - ny));
}
else if (tile.x == exBlocksX && tile.y != exBlocksY)
{
rows = calculateRows(tile, ny, TileSize, rows);
}
int rowCount = 0;
int rowZeroElement = 0;
try
{
for (rowCount = 0; rowCount < rows; rowCount++)
{
List<float> row = null;
int range = calculateRange(tile, nx, TileSize);
rowZeroElement = (int)(rowCount * range);
row = pTileData.GetRange(rowZeroElement, range);
f = row.ElementAt(0);
FirstVal = Convert.ToInt32(Math.Truncate((f - VertOffset) / VertScale));
Int32 LastVal = FirstVal;
// find max diff in line
Int32 Diff;
Int32 MaxDev = 0;
List<Int32> pDiffBuf = new List<Int32>();
for (int rowElementCounter = 1; rowElementCounter < row.Count; rowElementCounter++)
{
// find max diff in line
f = row.ElementAt(rowElementCounter);
TempInt = Convert.ToInt32(Math.Truncate((f - VertOffset) / VertScale));
Diff = TempInt - LastVal;
pDiffBuf.Add(Diff);
LastVal = TempInt;
MaxDev = MaxDev > Math.Abs(Diff) ? MaxDev : Math.Abs(Diff);
}
// should we use 8, 16 or 32 bit pixels?
byte LineDepth = 4;
if (MaxDev <= 127)
{
LineDepth = 1;
}
else
if (MaxDev <= 32767)
{
LineDepth = 2;
}
writer.Write(LineDepth);
writer.Write(FirstVal);
for (int rowElementCounter = 0; rowElementCounter < pDiffBuf.Count; rowElementCounter++)
{
Diff = pDiffBuf.ElementAt(rowElementCounter);
switch (LineDepth)
{
case 1:
c = Convert.ToSByte(Diff);
writer.Write(c);
break;
case 2:
s = Convert.ToInt16(Diff);
writer.Write(s);
break;
case 4:
writer.Write(Diff);
break;
}
}
}
}
catch (Exception ex)
{
System.Console.WriteLine("Tile x :" + tile.x);
System.Console.WriteLine("Tile y :" + tile.y);
System.Console.WriteLine("Rows :" + rows);
System.Console.WriteLine("RowCount :" + rowCount);
System.Console.WriteLine("RowZeroElement :" + rowZeroElement);
System.Console.WriteLine("exBlocksX :" + exBlocksX);
System.Console.WriteLine("exBlocksY :" + exBlocksY);
System.Console.WriteLine("pTileData count :" + pTileData.Count);
throw ex;
}
}
private Dictionary<short, HfzTile> readTiles(HfzHeader header, EndianBinaryReader reader)
{
// I know this is offensive but after all the headaches this gave me IT'S STAYING IN !
Boolean extraTileBullshit = false;
UInt32 nx = header.nx;
UInt32 ny = header.ny;
debugLine("nx " + nx);
debugLine("ny " + ny);
ushort TileSize = header.TileSize;
// determine number of blocks
UInt32 nBlocksX = nx / TileSize;
UInt32 nBlocksY = ny / TileSize;
if (nx % TileSize != 0)
{
nBlocksX++;
extraTileBullshit = true;
}
if (ny % TileSize != 0)
{
nBlocksY++;
extraTileBullshit = true;
}
debugLine("x: " + nBlocksX + ", y: " + nBlocksY + ", extraTileBullshit: " + extraTileBullshit);
short nTile = 0;
Dictionary<short, HfzTile> tiles = new Dictionary<short, HfzTile>();
for (UInt32 yAxis = 0; yAxis < nBlocksY; yAxis++)
{
for (UInt32 xAxis = 0; xAxis < nBlocksX; xAxis++)
{
tiles.Add(nTile, hfzReadTile(reader, header, xAxis, yAxis, extraTileBullshit));
nTile++;
}
}
return tiles;
}
private void hfzWriteHeader(ref EndianBinaryWriter writer, HfzHeader fh)
{
// copy header into buffer
writer.Write(Util.StringToByteArray("HF2", 4));
writer.Write(fh.FileVersionNo);
writer.Write(fh.nx);
writer.Write(fh.ny);
writer.Write(fh.TileSize);
writer.Write(fh.Precis);
writer.Write(fh.HorizScale);
writer.Write(fh.countExtLength());
// put extended header into a buffer
hfzHeader_EncodeExtHeaderBuf(fh, ref writer);
}
private HfzTile hfzReadTile(EndianBinaryReader reader, HfzHeader fh, UInt32 TileX, UInt32 TileY, Boolean extraPixelBullshit)
{
debugLine("TileX: "+ TileX +", TileY: " + TileY);
List<float> pTileData = new List<float>();
UInt32 i = 0, j = 0;
UInt32 TileSize = fh.TileSize;
UInt32 mapWidth = fh.nx;
UInt32 mapHeight = fh.ny;
UInt32 Rows = TileSize;
UInt32 RowSize = TileSize-1;
if (extraPixelBullshit)
{
Epsilon e = new Epsilon(1E-3);
if (RealExtensions.EQ(TileX, (mapWidth / TileSize), e))
{
debugLine("Entering X on " + TileX + "," + TileY);
debugLine("result: " + (TileSize - (((TileX + 1) * TileSize) - mapWidth)));
Rows = TileSize;
RowSize = (TileSize - (((TileX + 1) * TileSize) - mapWidth)) - 1;
}
if (RealExtensions.EQ(TileY, (mapHeight / TileSize), e))
{
debugLine("Entering Y on " + TileX + "," + TileY);
debugLine("result: " + (TileSize - (((TileY + 1) * TileSize) - mapHeight)));
Rows = TileSize - (((TileY + 1) * TileSize) - mapHeight);
RowSize = TileSize - 1;
}
if (RealExtensions.EQ(TileX, (mapWidth / TileSize), e) && RealExtensions.EQ(TileY, (mapHeight / TileSize), e))
{
debugLine("Entering X,Y on " + TileX + "," + TileY);
debugLine("result: " + (TileSize - (((TileY + 1) * TileSize) - mapHeight)));
debugLine("result: " + ((TileSize - (((TileX + 1) * TileSize) - mapWidth)) - 1));
Rows = TileSize - (((TileY + 1) * TileSize) - mapHeight);
RowSize = (TileSize - (((TileX + 1) * TileSize) - mapWidth)) - 1;
}
}
// read vert offset and sale
byte LineDepth = 0;
Int32 FirstVal = 0;
int tileValues = 0;
int firstValues = 0;
try
{
float VertScale = reader.ReadSingle();
float VertOffset = reader.ReadSingle();
for (j = 0; j < Rows; j++)
{
LineDepth = reader.ReadByte(); // 1, 2, or 4
debugLine("Linedepth " + LineDepth);
FirstVal = reader.ReadInt32();
debugLine("FirstVal " + FirstVal);
tileValues++;
firstValues++;
float pixelValue = (float)FirstVal * VertScale + VertOffset;
// set first pixel
pTileData.Add(pixelValue);
debugLine("FirstValue: " + pixelValue);
Int32 LastVal = FirstVal;
Int32 li;
for (i = 0; i < RowSize; i++)
{
switch (LineDepth)
{
case 1:
sbyte bvalue = reader.ReadSByte();
li = (Int32)bvalue;
break;
case 2:
short svalue = reader.ReadInt16();
li = (Int32)svalue;
break;
default:
li = reader.ReadInt32();
break;
}
pixelValue = (float)(li + LastVal) * VertScale + VertOffset;
LastVal = li + LastVal;
pTileData.Add(pixelValue);
tileValues++;
debugLine("v: " + pixelValue);
}
}
debugLine("TileValues: " + tileValues);
debugLine("FirstValues: " + firstValues);
}
catch (Exception)
{
System.Console.WriteLine("TileSize: " + TileSize);
System.Console.WriteLine("x: " + TileX);
System.Console.WriteLine("y: " + TileY);
System.Console.WriteLine("j: " + j);
System.Console.WriteLine("i: " + i);
System.Console.WriteLine("LineDepth: " + LineDepth);
System.Console.WriteLine("FirstVal: " + FirstVal);
throw;
}
debugLine("total tilevalues " + tileValues);
debugLine("total firstvalues " + firstValues);
return new HfzTile(TileX, TileY, RowSize+1, Rows, pTileData);
}
private HfzHeader hfzReadHeader(EndianBinaryReader reader)
{
HfzHeader fh = new HfzHeader();
string heading = UTF8Encoding.UTF8.GetString(reader.ReadBytes(4));
if (heading.Equals("HF2"))
{
throw new Exception("Invalid file format heading HF2 not found");
}
ushort fileVersion = reader.ReadUInt16();
fh.FileVersionNo = fileVersion;
UInt32 nx = reader.ReadUInt32();
fh.nx = nx;
UInt32 ny = reader.ReadUInt32();
fh.ny = ny;
ushort tileSize = reader.ReadUInt16();
fh.TileSize = tileSize;
float Precis = reader.ReadSingle();
fh.Precis = Precis;
float HorizScale = reader.ReadSingle();
fh.HorizScale = HorizScale;
UInt32 ExtHeaderLength = reader.ReadUInt32();
fh.ExtHeaderLength = ExtHeaderLength;
if (ExtHeaderLength > 0)
{
fh = decodeExtHeaderBuf(fh, reader);
}
return fh;
}
private void hfzHeader_EncodeExtHeaderBuf(HfzHeader fh, ref EndianBinaryWriter writer)
{
if (fh.nExtHeaderBlocks == 0)
{
return;
}
if (fh.countExtLength() == 0)
{
// can't have zero length
throw new Exception("Can't have a extended header of zero size");
}
HfzExtHeaderBlock pBlock;
for (int i = 0; i < fh.nExtHeaderBlocks; i++)
{
pBlock = fh.pExtHeaderBlocks.ElementAt(i);
writer.Write(Util.StringToByteArray(pBlock.BlockType, 4));
writer.Write(Util.StringToByteArray(pBlock.BlockName, 16));
writer.Write(pBlock.BlockLength);
if (pBlock.BlockLength > 0)
{
writer.Write(pBlock.pBlockData);
}
}
}
private HfzHeader decodeExtHeaderBuf(HfzHeader fh, EndianBinaryReader reader)
{
if (fh.ExtHeaderLength == 0)
{
return fh;
}
fh.nExtHeaderBlocks = 0;
fh.pExtHeaderBlocks = new List<HfzExtHeaderBlock>();
// read once to determine number of blocks
bool DoneFlag = false;
int offset = 0;
do
{
if (offset == fh.ExtHeaderLength)
{
DoneFlag = true;
}
else if (fh.ExtHeaderLength - offset < 24)
{
// not enough for a complete header
throw new Exception("Not enough bytes for a full extended header found. Header size: " + fh.ExtHeaderLength);
}
else
{
string blockType = UTF8Encoding.UTF8.GetString(reader.ReadBytes(4));
string blockName = UTF8Encoding.UTF8.GetString(reader.ReadBytes(16));
UInt32 blockLength = reader.ReadUInt32();
byte[] data = reader.ReadBytes((int)blockLength);
HfzExtHeaderBlock block = new HfzExtHeaderBlock(blockType, blockName, blockLength, data);
fh.pExtHeaderBlocks.Add(block);
fh.nExtHeaderBlocks = fh.nExtHeaderBlocks + 1;
offset = offset + 24 + (int)block.BlockLength;
}
} while (!DoneFlag);
return fh;
}