class TransformGraph

For testing, equivalent to calling TransformGraph(0).

Creates a new transform for use with this graph, and adds it to the graph's internal working

set of transforms. Released descendants of this transform will be kept alive until this

transform is released, or until the edges to the descendants are removed.

Releases a transform. If no other transforms reference this transform through an edge, this

transform will appear in the dead_transforms list the next time ComputeAndCleanup() is called.

Returns false if the transform was not created by CreateTransform(), or if the transform has

already been released.

Checks to see if the current transform has and child transform handles.

Creates a directed edge from the parent to the child transform. Children are kept alive by

unreleased parents. The parent transform should be an unreleased transform created by calling

CreateTransform() on this object, but this is only enforced by DCHECK. Returns false if the

child transform is already a child of the parent transform.

Removes a directed edge from the parent and child transform. This may result in one or more

transforms being added to the dead_transforms list the next time ComputeAndCleanup() is called.

The parent transform should be an unreleased transform created by calling CreateTransform() on

this object, but this is only enforced by DCHECK. Returns false if the child transform was not

previously a child of the parent transform. This function does not remove priority children.

Removes all child edges from the parent transform, replacing them with transforms from

new_children. The parent transform should be an unreleased transform created by calling

CreateTransform() on this object, but this is only enforced by DCHECK.

Removes all child edges from the parent transform. This function does not remove priority

children.

Specifies a directed edge from the parent to the child transform that will always be traversed

first for the parent transform. The TransformGraph does not prevent the new priority child

from being in the normal child set as well. The parent transform should be an unreleased

transform created by calling CreateTransform() on this object, but this is only enforced by

DCHECK.

Clears the priority child of a specific parent transform. This may result in one or more

transforms being added to the dead_transforms list the next time ComputeAndCleanup() is

called. The parent transform should be an unreleased transform created by calling

CreateTransform() on this object, but this is only enforced by DCHECK.

Clears all data from this entire graph, with one exception. The passed in handle is maintained

as a member of the working set, but with all existing children removed.

This operation results in all handles other than |exception| showing up in dead_transforms on

the next call to ComputeAndCleanup().

Generates a topology vector rooted at the "start" transform, as well as additional data

involving dead transforms, cycles, and iterations. See the TopologyData struct for more

information.

If max_iterations is reached, the transform graph will be in an invalid state, and should be

reset before any further methods are called.