/// <summary>
/// Saves a tile to the ROM image.
/// </summary>
/// <param name="tile">The tile to save.</param>
public void writeTile(MDTile tile)
{
int address = tile.Address;
//move to the correct position
this.setStreamPosition(this.writer.BaseStream, address);
//this will obvious break if arrays are staggered
int xDimension = tile.PixelData.Length;
int yDimension = tile.PixelData[0].Length;
//recombine the data
int size = (xDimension * yDimension) / 2;
byte[] buffer = new byte[size];
int xCounter = 0;
int yCounter = 0;
for (int index = 0; index < size; index++)
{
string combine = tile.PixelData[xCounter][yCounter].ToString("X") + tile.PixelData[xCounter + 1][yCounter].ToString("X");
buffer[index] = Byte.Parse(combine, System.Globalization.NumberStyles.HexNumber);
xCounter += 2;
if (xCounter == xDimension)
{
xCounter = 0;
yCounter++;
}
}
//write the buffer back
this.writer.Write(buffer);
}
/// <summary>
/// Read a tile from the ROM image.
/// </summary>
/// <param name="offset">The address to start at.</param>
/// <param name="xDimension">The xDimension (width) of the tile.</param>
/// <param name="yDimension">The yDimension (height) of the tile.</param>
/// <returns></returns>
public MDTile readTile(int offset, int xDimension, int yDimension)
{
//initialize the tile
MDTile tile = new MDTile();
tile.Address = offset;
tile.PixelData = new byte[xDimension][];
for (int index = 0; index < xDimension; index++)
{
tile.PixelData[index] = new byte[yDimension];
}
//move to the correct position
this.setStreamPosition(this.reader.BaseStream, offset);
//read the tile data - each byte contains *two* pixels
int size = (xDimension * yDimension) / 2;
byte[] buffer = this.reader.ReadBytes(size);
int xCounter = 0;
int yCounter = 0;
for (int index = 0; index < size; index++)
{
byte byteValue = buffer[index];
//split the byte
string byteString = byteValue.ToString("X");
if (byteString.Length < 2)
{
byteString = "0" + byteString;
}
tile.PixelData[xCounter][yCounter] = byte.Parse(byteString.Substring(0, 1), System.Globalization.NumberStyles.HexNumber);
xCounter++;
tile.PixelData[xCounter][yCounter] = byte.Parse(byteString.Substring(1, 1), System.Globalization.NumberStyles.HexNumber);
xCounter++;
if (xCounter == xDimension)
{
xCounter = 0;
yCounter++;
}
}
return(tile);
}
