Struct CompositionReads 

pub struct CompositionReads<'a> { /* private fields */ }

What each composition’s output reads: the group inputs and clip nodes a walk from its output reaches, along the inputs drawing each node reads, into the compositions its group nodes draw. A group draws what its nodes would inline, so a group node needs only the ports its composition reads: a port it never reads may be left unconnected, and what a connected one reads is not drawn.

Built once for a project’s compositions, in dependency order, without recursion. A composition that uses itself (which validation refuses) is taken to read every port and draw the clip.

Implementations

impl<'a> CompositionReads<'a>

pub fn new(compositions: &HashMap<&'a CompositionId, &'a Composition>) -> Self

What each of compositions reads; it resolves group nodes by ID.

pub fn reads_port(&self, composition: &CompositionId, port: usize) -> bool

Whether composition’s output reads its group input port; true for a composition these reads do not know.

pub fn draws_clip(&self, composition: &CompositionId) -> bool

Whether composition, shown by a clip, draws the clip’s picture: its output reaches a clip node, directly or in a group. True for a composition these reads do not know.

pub fn needed_inputs<'n>(&self, node: &'n CompositionNode) -> Vec<NodeInput<'n>>

The inputs drawing node reads, in input order: its CompositionNode::needed_inputs, of a group node only the ports its composition reads.

Trait Implementations

impl<'a> Clone for CompositionReads<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for CompositionReads<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Default for CompositionReads<'a>

fn default() -> Self

Returns the “default value” for a type.