private const int MAX_BLOCK_SIZE = 1024 * 1024 * 10;//10MB
public void Compute(IRasterBand[] srcRasters, int[] aoi, RasterQuickStatResult[] results, Action <int, string> progressTracker)
{
int width = srcRasters[0].Width;
int height = srcRasters[0].Height;
Rectangle aoiRect = AOIHelper.ComputeAOIRect(aoi, new Size(width, height));
SortedList <int, AOIHelper.ColRangeOfRow> aoiRowRanges = AOIHelper.ComputeColRanges(aoi, new Size(width, height));
T[] buffer = GetRowBuffer(aoiRowRanges);
GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
IntPtr bufferPtr = handle.AddrOfPinnedObject();
try
{
int cols = 0;
for (int i = 0; i < srcRasters.Length; i++)
{
foreach (int r in aoiRowRanges.Keys)
{
AOIHelper.ColRangeOfRow range = aoiRowRanges[r];
cols = range.EndCol - range.BeginCol + 1;
srcRasters[i].Read(range.BeginCol, range.Row, cols, 1, bufferPtr, srcRasters[i].DataType, cols, 1);
HandleHistogram(buffer, results[i], cols);
}
}
HandleMeanValues(srcRasters.Length, results, aoi.Length);
}
finally
{
handle.Free();
}
}
private void VisitByAOI(int[] aoi, Action <float, float> action, Action <int, string> progressTracker)
{
IRasterBand[] srcRasters = new IRasterBand[] { _xBand, _yBand };
int width = _xBand.Width;
int height = _xBand.Height;
int bandCount = 2;
Rectangle aoiRect = AOIHelper.ComputeAOIRect(aoi, new Size(width, height));
//Dictionary<int, AOIHelper.AOIRowRange> aoiRowRanges = AOIHelper.ComputeRowIndexRange(aoi, new Size(width, height));
SortedList <int, AOIHelper.ColRangeOfRow> aoiRowRanges = AOIHelper.ComputeColRanges(aoi, new Size(width, height));
int rowCount = aoiRect.Height;
int bRow = aoiRect.Top;
int eRow = aoiRect.Bottom;
int bCol = 0, eCol = 0;
T[][] srcBuffers = new T[bandCount][];
GCHandle[] srcHandles = new GCHandle[bandCount];
for (int i = 0; i < bandCount; i++)
{
srcBuffers[i] = new T[width];
srcHandles[i] = GCHandle.Alloc(srcBuffers[i], GCHandleType.Pinned);
}
//
try
{
AOIHelper.ColRangeOfRow range = null;
for (int r = bRow; r < eRow; r++)
{
//读取一行数据
for (int b = 0; b < bandCount; b++)
{
srcRasters[b].Read(0, r, width, 1, srcHandles[b].AddrOfPinnedObject(), _xBand.DataType, width, 1);
}
//获取该行AOI的起始列
if (aoiRowRanges.ContainsKey(r))
{
range = aoiRowRanges[r];
}
else
{
continue;
}
//调用计算委托
bCol = range.BeginCol;
eCol = range.EndCol;
for (int c = bCol; c < eCol; c++)
{
action(ToFloat(srcBuffers[0][c]), ToFloat(srcBuffers[1][c]));
}
//
if (progressTracker != null)
{
progressTracker(100 * (r - bRow + 1) / rowCount, string.Empty);
}
}
}
finally
{
for (int i = 0; i < bandCount; i++)
{
srcHandles[i].Free();
}
}
}
private void ComputeByAOI(IRasterBand[] srcRasters, int[] aoi, out double[] minValues, out double[] maxValues, out double[] meanValues, Action <int, string> progressTracker)
{
enumDataType dataType = srcRasters[0].DataType;
int width = srcRasters[0].Width;
int height = srcRasters[0].Height;
//
int bandCount = srcRasters.Length;
minValues = new double[bandCount];
maxValues = new double[bandCount];
meanValues = new double[bandCount];
for (int i = 0; i < bandCount; i++)
{
minValues[i] = double.MaxValue;
maxValues[i] = double.MinValue;
}
//
Rectangle aoiRect = AOIHelper.ComputeAOIRect(aoi, new Size(width, height));
SortedList <int, AOIHelper.ColRangeOfRow> aoiRowRanges = AOIHelper.ComputeColRanges(aoi, new Size(width, height));
int rowCount = aoiRect.Height;
int bRow = aoiRect.Top;
int eRow = aoiRect.Bottom;
int bCol = 0, eCol = 0;
T[][] srcBuffers = new T[bandCount][];
GCHandle[] srcHandles = new GCHandle[bandCount];
for (int i = 0; i < bandCount; i++)
{
srcBuffers[i] = new T[width];
srcHandles[i] = GCHandle.Alloc(srcBuffers[i], GCHandleType.Pinned);
}
//
try
{
int aoiPixelCount = 0;
AOIHelper.ColRangeOfRow range = null;
for (int r = bRow; r < eRow; r++)
{
try
{
//读取一行数据
for (int b = 0; b < bandCount; b++)
{
srcRasters[b].Read(0, r, width, 1, srcHandles[b].AddrOfPinnedObject(), dataType, width, 1);
}
//获取该行AOI的起始列
if (aoiRowRanges.ContainsKey(r))
{
range = aoiRowRanges[r];
//调用计算委托
bCol = range.BeginCol;
eCol = range.EndCol + 1;
HandleBlock(bandCount, srcBuffers, bCol, eCol, minValues, maxValues, meanValues);
aoiPixelCount += (eCol - bCol);
if (progressTracker != null)
{
progressTracker(100 * (r - bRow + 1) / rowCount, string.Empty);
}
}
}
catch (System.Exception ex)
{
throw ex;
}
}
HandleMeanValues(bandCount, meanValues, aoiPixelCount);
}
finally
{
for (int i = 0; i < bandCount; i++)
{
srcHandles[i].Free();
}
}
}