/// <summary>
/// Reads the header only from the specified mwi file. The header is in xml format.
/// This is a test. We may have to jurry rig the thing to ensure it ignores the actual
/// image content.
/// </summary>
/// <param name="filename">Whether this is the mwi or mwh file, this reads the mwh file for the filename.</param>
public void ReadHeader(string filename)
{
string header = Path.ChangeExtension(filename, "mwh");
XmlSerializer s = new XmlSerializer(typeof(PyramidHeader));
TextReader r = new StreamReader(header);
_header = (PyramidHeader) s.Deserialize(r);
PyramidImageHeader ph = _header.ImageHeaders[0];
Bounds = new RasterBounds(ph.NumRows, ph.NumColumns, ph.Affine);
base.Width = _header.ImageHeaders[0].NumColumns;
base.Height = _header.ImageHeaders[0].NumRows;
r.Close();
}
/// <summary>
/// This takes an original image and calculates the header content for all the lower resolution tiles.
/// This does not actually write the bytes for those images.
/// </summary>
/// <param name="numRows">The number of rows in the original image</param>
/// <param name="numColumns">The number of columns in the original image</param>
/// <param name="affineCoefficients">
/// the array of doubles in ABCDEF order
/// X' = A + Bx + Cy
/// Y' = D + Ex + Fy
/// </param>
public void CreateHeaders(int numRows, int numColumns, double[] affineCoefficients)
{
_header = new PyramidHeader();
List<PyramidImageHeader> headers = new List<PyramidImageHeader>();
int scale = 0;
long offset = 0;
int nr = numRows;
int nc = numColumns;
while (nr > 2 && nc > 2)
{
PyramidImageHeader ph = new PyramidImageHeader();
ph.SetAffine(affineCoefficients, scale);
ph.SetNumRows(numRows, scale);
ph.SetNumColumns(numColumns, scale);
ph.Offset = offset;
offset += (ph.NumRows * ph.NumColumns * 4);
nr = nr/ 2;
nc = nc / 2;
scale++;
headers.Add(ph);
}
_header.ImageHeaders = headers.ToArray();
}
