/// <summary>
/// Adds the bands from the bands view model.
/// </summary>
/// <param name="viewModel"></param>
public void AddBands(AddLayersDialogViewModel viewModel, IProgress <double> progress)
{
// Initialize RGB data
byte[] bgra = null;
Dataset rgbDataSet = null;
if (viewModel.AddRgb)
{
var firstRgbBand = viewModel.Layers.First(b => b.B || b.G || b.R);
rgbDataSet = Gdal.Open(firstRgbBand.Path, Access.GA_ReadOnly);
bgra = new byte[rgbDataSet.RasterXSize * rgbDataSet.RasterYSize * 4];
}
var firstBand = viewModel.Layers.First();
var firstDataSet = Gdal.Open(firstBand.Path, Access.GA_ReadOnly);
var builder = Matrix <double> .Build;
int totalBands = viewModel.Layers.Count + (viewModel.AddRgb ? 1 : 0);
int currentProgress = 0;
// Parallel band loading
Parallel.ForEach(viewModel.Layers, (currentLayer, _, bandIndex) =>
{
// Load raster
var dataSet = Gdal.Open(currentLayer.Path, Access.GA_ReadOnly);
var rasterBand = dataSet.GetRasterBand(1);
var bitsPerPixel = rasterBand.DataType.ToPixelFormat().BitsPerPixel;
int stride = (rasterBand.XSize * bitsPerPixel / 8);
IntPtr data = Marshal.AllocHGlobal(stride * rasterBand.YSize);
rasterBand.ReadRaster(0, 0, rasterBand.XSize, rasterBand.YSize, data, rasterBand.XSize, rasterBand.YSize, rasterBand.DataType, bitsPerPixel / 8, stride);
// Cutoff
int minCutValue, maxCutValue;
CalculateMinMaxCut(rasterBand, currentLayer.MinCutOff, currentLayer.MaxCutOff, out minCutValue, out maxCutValue);
// Apply RGB contrast enhancement
if (viewModel.AddRgb && viewModel.RgbContrastEnhancement && (currentLayer.B || currentLayer.G || currentLayer.R))
{
int colorOffset = currentLayer.B ? 0 : currentLayer.G ? 1 : currentLayer.R ? 2 : -1;
unsafe
{
// TODO what if layer is not of type uint?
ushort *dataPtr = (ushort *)data.ToPointer();
Parallel.ForEach(Partitioner.Create(0, rasterBand.XSize * rasterBand.YSize),
(range) =>
{
for (int dataIndex = range.Item1; dataIndex < range.Item2; ++dataIndex)
{
ushort current = *(dataPtr + dataIndex);
byte val = (byte)MoreMath.Clamp((current - minCutValue) / (double)(maxCutValue - minCutValue) * byte.MaxValue, 0, byte.MaxValue - 1);
bgra[dataIndex * 4 + colorOffset] = val;
bgra[dataIndex * 4 + 3] = 255;
}
});
}
}
// Apply band contrast enhancement
if (currentLayer.ContrastEnhancement)
{
data = ApplyContrastEnhancement(rasterBand, data, minCutValue, maxCutValue);
}
Application.Current.Dispatcher.Invoke(() =>
{
var imageBandViewModel = CreateLayerViewModel(dataSet, rasterBand, stride, data, currentLayer);
Layers.AddSorted(imageBandViewModel, Comparer <LayerViewModel> .Create((a, b) => string.Compare(a.Name, b.Name, StringComparison.Ordinal)));
progress.Report(++currentProgress);
Marshal.FreeHGlobal(data);
});
});
// Load rgb image
if (viewModel.AddRgb)
{
// Create RGB image
Application.Current.Dispatcher.Invoke(() =>
{
var rgbStride = rgbDataSet.RasterXSize * 4;
var rgbImage = BitmapSource.Create(rgbDataSet.RasterXSize, rgbDataSet.RasterYSize, 96, 96, PixelFormats.Bgra32, null, bgra, rgbStride);
// Transformation
double[] rgbTransform = new double[6];
rgbDataSet.GetGeoTransform(rgbTransform);
var vecBuilder = Vector <double> .Build;
var upperLeft = vecBuilder.DenseOfArray(new[] { rgbTransform[0], rgbTransform[3], 1 });
var xRes = rgbTransform[1];
var yRes = rgbTransform[5];
var bottomRight =
vecBuilder.DenseOfArray(new[]
{
upperLeft[0] + (rgbDataSet.RasterXSize * xRes),
upperLeft[1] + (rgbDataSet.RasterYSize * yRes), 1
});
double[,] matArray =
{
{ rgbTransform[1], rgbTransform[2], rgbTransform[0] },
{ rgbTransform[4], rgbTransform[5], rgbTransform[3] },
{ 0, 0, 1 }
};
var transformMat = builder.DenseOfArray(matArray);
var layerViewModel = new LayerViewModel("RGB", SatelliteType.None, null, viewModel.RgbContrastEnhancement, xRes, yRes, new WriteableBitmap(rgbImage),
transformMat, upperLeft, bottomRight, 0, 0, false, false, false, true, false, false);
Layers.Insert(0, layerViewModel);
progress.Report(++currentProgress);
});
}
// TODO use projection to get correct transformation?
double[] transform = new double[6];
firstDataSet.GetGeoTransform(transform);
double[,] transformArray =
{
{ 1, transform[2], transform[0] },
{ transform[4], -1, transform[3] },
{ 0, 0, 1 }
};
Messenger.Default.Send(builder.DenseOfArray(transformArray));
WindowEnabled = true;
}
