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116 lines
4.2 KiB
116 lines
4.2 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkExtentSplitter.h,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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// .NAME vtkExtentSplitter - Split an extent across other extents.
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// .SECTION Description
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// vtkExtentSplitter splits each input extent into non-overlapping
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// sub-extents that are completely contained within other "source
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// extents". A source extent corresponds to some resource providing
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// an extent. Each source extent has an integer identifier, integer
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// priority, and an extent. The input extents are split into
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// sub-extents according to priority, availability, and amount of
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// overlap of the source extents. This can be used by parallel data
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// readers to read as few piece files as possible.
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#ifndef __vtkExtentSplitter_h
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#define __vtkExtentSplitter_h
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#include "vtkObject.h"
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class vtkExtentSplitterInternals;
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class VTK_COMMON_EXPORT vtkExtentSplitter : public vtkObject
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{
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public:
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vtkTypeRevisionMacro(vtkExtentSplitter,vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent);
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static vtkExtentSplitter *New();
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// Description:
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// Add/Remove a source providing the given extent. Sources with
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// higher priority numbers are favored. Source id numbers and
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// priorities must be non-negative.
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void AddExtentSource(int id, int priority, int x0, int x1,
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int y0, int y1, int z0, int z1);
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void AddExtentSource(int id, int priority, int* extent);
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void RemoveExtentSource(int id);
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void RemoveAllExtentSources();
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// Description:
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// Add an extent to the queue of extents to be split among the
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// available sources.
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void AddExtent(int x0, int x1, int y0, int y1, int z0, int z1);
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void AddExtent(int* extent);
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// Description:
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// Split the extents currently in the queue among the available
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// sources. The queue is empty when this returns. Returns 1 if all
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// extents could be read. Returns 0 if any portion of any extent
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// was not available through any source.
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int ComputeSubExtents();
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// Description:
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// Get the number of sub-extents into which the original set of
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// extents have been split across the available sources. Valid
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// after a call to ComputeSubExtents.
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int GetNumberOfSubExtents();
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// Description:
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// Get the sub-extent associated with the given index. Use
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// GetSubExtentSource to get the id of the source from which this
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// sub-extent should be read. Valid after a call to
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// ComputeSubExtents.
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int* GetSubExtent(int index);
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void GetSubExtent(int index, int* extent);
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// Description:
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// Get the id of the source from which the sub-extent associated
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// with the given index should be read. Returns -1 if no source
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// provides the sub-extent.
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int GetSubExtentSource(int index);
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// Description:
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// Get/Set whether "point mode" is on. In point mode, sub-extents
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// are generated to ensure every point in the update request is
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// read, but not necessarily every cell. This can be used when
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// point data are stored in a planar slice per piece with no cell
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// data. The default is OFF.
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vtkGetMacro(PointMode, int);
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vtkSetMacro(PointMode, int);
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vtkBooleanMacro(PointMode, int);
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protected:
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vtkExtentSplitter();
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~vtkExtentSplitter();
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// Internal utility methods.
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void SplitExtent(int* extent, int* subextent);
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int IntersectExtents(const int* extent1, const int* extent2, int* result);
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int Min(int a, int b);
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int Max(int a, int b);
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// Internal implementation data.
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vtkExtentSplitterInternals* Internal;
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// On if reading only all points (but not always all cells) is
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// necessary. Used for reading volumes of planar slices storing
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// only point data.
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int PointMode;
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private:
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vtkExtentSplitter(const vtkExtentSplitter&); // Not implemented.
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void operator=(const vtkExtentSplitter&); // Not implemented.
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};
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#endif
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