javax.media.jai
Interface TileScheduler

public abstract interface TileScheduler

A class implementing a mechanism for scheduling tile calculation. In various implementations tile computation may make use of multithreading and multiple simultaneous network connections for improved performance.

Method Summary

void	prefetchTiles(PlanarImage target, java.awt.Point[] tileIndices) Hints to the TileScheduler that the given tiles from the given PlanarImage might be needed in the near future.
java.awt.image.Raster	scheduleTile(OpImage target, int tileX, int tileY) Schedules a tile for computation.
java.awt.image.Raster[]	scheduleTiles(OpImage target, java.awt.Point[] tileIndices) Schedules a list of tiles for computation.

Method Detail

scheduleTile

public java.awt.image.Raster scheduleTile(OpImage target,
                                          int tileX,
                                          int tileY)

Schedules a tile for computation. Called by OpImage.getTile(). After performing a dependency analysis, this method makes OpImage.computeTile() calls for source tiles needed to calculate the ultimate destination tile.

Parameters:

target - An OpImage whose tile is to be computed.

tileX - The X index of the tile to be computed.

tileY - The Y index of the tile to be computed.

Returns:

A Raster containing the contents of the tile.

scheduleTiles

public java.awt.image.Raster[] scheduleTiles(OpImage target,
                                             java.awt.Point[] tileIndices)

Schedules a list of tiles for computation. Called by OpImage.getTiles. After performing a dependency analysis, this method makes OpImage.computeTile() calls for source tiles needed to calculate the ultimate destination tile.

Parameters:

target - The OpImage to schedule tiles from.

tileIndices - A list of tileIndices indicating which tiles to schedule for computation.

Returns:

An array of Raster containing a computed raster for every tileIndex passed in.

prefetchTiles

public void prefetchTiles(PlanarImage target,
                          java.awt.Point[] tileIndices)

Hints to the TileScheduler that the given tiles from the given PlanarImage might be needed in the near future. Some TileScheduler implementations will spawn a low priority thread to compute the tiles while others may ignore the hint.

Parameters:

target - The OpImage to prefetch tiles from.

tileIndices - A list of tileIndices indicating which tiles to prefetch.