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java.lang.Object java.util.Observable javax.media.jai.RecyclingTileFactory
A simple implementation of TileFactory
wherein the tiles
returned from createTile()
attempt to re-use primitive
arrays provided by the TileRecycler
method
recycleTile()
.
A simple example of the use of this class is as follows wherein image files are read, each image is filtered, and each output written to a file:
String[] sourceFiles; // source file paths KernelJAI kernel; // filtering kernel // Create a RenderingHints object and set hints. RenderingHints rh = new RenderingHints(null); RecyclingTileFactory rtf = new RecyclingTileFactory(); rh.put(JAI.KEY_TILE_RECYCLER, rtf); rh.put(JAI.KEY_TILE_FACTORY, rtf); rh.put(JAI.KEY_IMAGE_LAYOUT, new ImageLayout().setTileWidth(32).setTileHeight(32)); int counter = 0; // Read each image, filter it, and save the output to a file. for(int i = 0; i < sourceFiles.length; i++) { PlanarImage source = JAI.create("fileload", sourceFiles[i]); ParameterBlock pb = (new ParameterBlock()).addSource(source).add(kernel); // The TileFactory hint will cause tiles to be created by 'rtf'. RenderedOp dest = JAI.create("convolve", pb, rh); String fileName = "image_"+(++counter)+".tif"; JAI.create("filestore", dest, fileName); // The TileRecycler hint will cause arrays to be reused by 'rtf'. dest.dispose(); }In the above code, if the
SampleModel
of all source
images is identical, then data arrays should only be created in the
first iteration.
Constructor Summary | |
RecyclingTileFactory()
Constructs a RecyclingTileFactory . |
Method Summary | |
boolean |
canReclaimMemory()
Returns true . |
WritableRaster |
createTile(SampleModel sampleModel,
Point location)
Create a tile with the specified SampleModel and
location, possibly using a DataBuffer constructed
using a reclaimed data bank (array). |
void |
flush()
Removes references to all internally cached data arrays, if any. |
long |
getMemoryUsed()
Returns the amount of memory currently being consumed by data arrays cached within this object. |
boolean |
isMemoryCache()
Returns true . |
void |
recycleTile(Raster tile)
Recycle the given tile. |
Methods inherited from class java.util.Observable |
addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public RecyclingTileFactory()
RecyclingTileFactory
.
Method Detail |
public boolean canReclaimMemory()
true
.
canReclaimMemory
in interface TileFactory
public boolean isMemoryCache()
true
.
isMemoryCache
in interface TileFactory
public long getMemoryUsed()
TileFactory
getMemoryUsed
in interface TileFactory
public void flush()
TileFactory
flush
in interface TileFactory
public WritableRaster createTile(SampleModel sampleModel, Point location)
TileFactory
SampleModel
and
location, possibly using a DataBuffer
constructed
using a reclaimed data bank (array). If it is not possible to
reclaim an array, a new one will be allocated so that a tile
is guaranteed to be generated. If a reclaimed array is used
to create the tile, its elements should be set to zero before
the tile is returned to the caller.
createTile
in interface TileFactory
sampleModel
- The SampleModel
to use in
creating the WritableRaster
.location
- The location (minX, minY
) of
the WritableRaster
; if null
,
(0, 0)
will be used.
WritableRaster
which might have a
DataBuffer
created using a previously
allocated array.public void recycleTile(Raster tile)
recycleTile
in interface TileRecycler
tile
- A tile which mey be re-used either directly or
by reclaiming its internal DataBuffer
or primitive data array.
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