MemoryPressureRelease class

Wraps child and gives renderer's pooled targets back when the platform warns about memory.

What the pool does without this is settle at a high-water mark and stay there. It keeps one texture of every attachment shape any frame has ever needed: turn bloom on once and its five levels are held for the rest of the session, take one screenshot at twice the window size and that pair is held too. On a desktop that is a megabyte nobody notices. On a phone the process is killed, which is a crash class rather than a slow frame — and it arrives as a report with no Dart stack, because the operating system did it.

Wired to the platform's own warning rather than to a budget. A budget means this package deciding how many megabytes a game may hold on a device it knows nothing about, and being wrong in both directions. didHaveMemoryPressure is the one signal that is actually about this device, at this moment, with these other applications running.

What the next frame pays is one round of allocation, once. What is lent out is left alone, so a frame in flight keeps the targets it is drawing into.

MemoryPressureRelease(
  renderer: renderer,
  child: SceneSurface(renderer: renderer, /* … */),
)
Inheritance

Constructors

MemoryPressureRelease({required Renderer renderer, required Widget child, void onReleased()?, Key? key})
const

Properties

child → Widget
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onReleased → void Function()?
Called after the release, for an application that logs it.
final
renderer → Renderer
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<MemoryPressureRelease>
Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited