Module org.bigdataviewer.core

Package bdv.viewer.render

Class DefaultMipmapOrdering

java.lang.Object

bdv.viewer.render.DefaultMipmapOrdering

All Implemented Interfaces:

MipmapOrdering

public class DefaultMipmapOrdering
extends Object
implements MipmapOrdering

The standard mipmap ordering strategy for local hdf5 data. Assumes that mipmap indices in the source are ordered by decreasing resolution. Finds the mipmap level that best matches the given screen scale for the given source. Then, starting from this best level render all levels down to the lowest resolution. For prefetching reverse that order (lowest resolution is prefetched first). Additionally, when moving between time-points the following hack is used: When scrolling through time, we often get frames for which no data was loaded yet. To speed up rendering in these cases, use only two mipmap levels: the optimal and the coarsest. By doing this, we require at most two passes over the image at the expense of ignoring data present in intermediate mipmap levels. The assumption is, that we will either be moving back and forth between images that have all data present already or that we move to a new image with no data present at all.

Author:

Tobias Pietzsch

Nested Class Summary

Nested classes/interfaces inherited from interface bdv.viewer.render.MipmapOrdering

MipmapOrdering.Level, MipmapOrdering.MipmapHints, MipmapOrdering.PrefetchOrderComparator, MipmapOrdering.RenderOrderComparator

Field Summary

Fields inherited from interface bdv.viewer.render.MipmapOrdering

prefetchOrderComparator, renderOrderComparator

Constructor Summary

Constructors

Constructor	Description
DefaultMipmapOrdering(Source<?> source)
DefaultMipmapOrdering(Source<?> source, boolean createHints, net.imglib2.cache.volatiles.LoadingStrategy renderLoadingStrategy, boolean renderEnqueuToFront, net.imglib2.cache.volatiles.LoadingStrategy prefetchLoadingStrategy, boolean prefetchEnqueuToFront)

Method Summary

Modifier and Type	Method	Description
MipmapOrdering.MipmapHints	getMipmapHints(net.imglib2.realtransform.AffineTransform3D screenTransform, int timepoint, int previousTimepoint)	Evaluate mipmap levels such that they can be ordered for rendering and/or prefetching.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultMipmapOrdering

public DefaultMipmapOrdering(Source<?> source,
                             boolean createHints,
                             net.imglib2.cache.volatiles.LoadingStrategy renderLoadingStrategy,
                             boolean renderEnqueuToFront,
                             net.imglib2.cache.volatiles.LoadingStrategy prefetchLoadingStrategy,
                             boolean prefetchEnqueuToFront)

Parameters:

source -

createHints - If true, MipmapOrdering.Levels are created with CacheHints computed as follows. LoadingStrategy and enqueue order are set as specified in the remaining parameters. Priority is set such that the coarsest mipmap level has highest priority. If false, MipmapOrdering.Levels are created with null CacheHints.

renderLoadingStrategy -

renderEnqueuToFront -

prefetchLoadingStrategy -

prefetchEnqueuToFront -

DefaultMipmapOrdering

public DefaultMipmapOrdering(Source<?> source)

Method Detail

getMipmapHints

public MipmapOrdering.MipmapHints getMipmapHints(net.imglib2.realtransform.AffineTransform3D screenTransform,
                                                 int timepoint,
                                                 int previousTimepoint)

Description copied from interface: MipmapOrdering

Evaluate mipmap levels such that they can be ordered for rendering and/or prefetching.

Specified by:

getMipmapHints in interface MipmapOrdering

Parameters:

screenTransform - transforms screen coordinates to global coordinates.

timepoint - current timepoint index

previousTimepoint - previous timepoint index