CanvasFrontBufferedRenderer.Callback

Artifact: androidx.graphics:graphics-core

Kotlin |Java

interface CanvasFrontBufferedRenderer.Callback<T : Any?>

Provides callbacks for consumers to draw into the front and multi buffered layers as well as provide opportunities to synchronize SurfaceControlCompat.Transactions to submit the layers to the hardware compositor.

Summary

Public functions
`Unit`	`@WorkerThread onDrawFrontBufferedLayer( canvas: Canvas, bufferWidth: Int, bufferHeight: Int, param: T )` Callback invoked to render content into the front buffered layer with the specified parameters.
`Unit`	`@WorkerThread onDrawMultiBufferedLayer( canvas: Canvas, bufferWidth: Int, bufferHeight: Int, params: Collection<T> )` Callback invoked to render content into the front buffered layer with the specified parameters.
`open Unit`	`@WorkerThread onFrontBufferedLayerRenderComplete( frontBufferedLayerSurfaceControl: SurfaceControlCompat, transaction: SurfaceControlCompat.Transaction )` Optional callback invoked when rendering to the front buffered layer is complete but before the buffers are submitted to the hardware compositor.
`open Unit`	`@WorkerThread onMultiBufferedLayerRenderComplete( frontBufferedLayerSurfaceControl: SurfaceControlCompat, multiBufferedLayerSurfaceControl: SurfaceControlCompat, transaction: SurfaceControlCompat.Transaction )` Optional callback invoked when rendering to the multi buffered layer is complete but before the buffers are submitted to the hardware compositor.

Public functions

onDrawFrontBufferedLayer

Added in 1.0.0-rc01

@WorkerThread
fun onDrawFrontBufferedLayer(
    canvas: Canvas,
    bufferWidth: Int,
    bufferHeight: Int,
    param: T
): Unit

Callback invoked to render content into the front buffered layer with the specified parameters.

Parameters
`canvas: Canvas`	`Canvas` used to issue drawing instructions into the front buffered layer
`bufferWidth: Int`	Width of the buffer that is being rendered into.
`bufferHeight: Int`	Height of the buffer that is being rendered into.
`param: T`	optional parameter provided the corresponding `CanvasFrontBufferedRenderer.renderFrontBufferedLayer` method that triggered this request to render into the front buffered layer

onDrawMultiBufferedLayer

@WorkerThread
fun onDrawMultiBufferedLayer(
    canvas: Canvas,
    bufferWidth: Int,
    bufferHeight: Int,
    params: Collection<T>
): Unit

Callback invoked to render content into the front buffered layer with the specified parameters.

Parameters
`canvas: Canvas`	`Canvas` used to issue drawing instructions into the front buffered layer
`bufferWidth: Int`	Width of the buffer that is being rendered into.
`bufferHeight: Int`	Height of the buffer that is being rendered into.
`params: Collection<T>`	optional parameter provided to render the entire scene into the multi buffered layer. This is a collection of all parameters provided in consecutive invocations to `CanvasFrontBufferedRenderer.renderFrontBufferedLayer` since the last call to `CanvasFrontBufferedRenderer.commit` has been made. After `CanvasFrontBufferedRenderer.commit` is invoked, this collection is cleared and new parameters are added on each subsequent call to `CanvasFrontBufferedRenderer.renderFrontBufferedLayer`

onFrontBufferedLayerRenderComplete

Added in 1.0.0-rc01

@WorkerThread
open fun onFrontBufferedLayerRenderComplete(
    frontBufferedLayerSurfaceControl: SurfaceControlCompat,
    transaction: SurfaceControlCompat.Transaction
): Unit

Optional callback invoked when rendering to the front buffered layer is complete but before the buffers are submitted to the hardware compositor. This provides consumers a mechanism for synchronizing the transaction with other SurfaceControlCompat objects that maybe rendered within the scene.

Parameters
`frontBufferedLayerSurfaceControl: SurfaceControlCompat`	Handle to the `SurfaceControlCompat` where the front buffered layer content is drawn. This can be used to configure various properties of the `SurfaceControlCompat` like z-ordering or visibility with the corresponding `SurfaceControlCompat.Transaction`.
`transaction: SurfaceControlCompat.Transaction`	Current `SurfaceControlCompat.Transaction` to apply updated buffered content to the front buffered layer.

onMultiBufferedLayerRenderComplete

Added in 1.0.0-rc01

@WorkerThread
open fun onMultiBufferedLayerRenderComplete(
    frontBufferedLayerSurfaceControl: SurfaceControlCompat,
    multiBufferedLayerSurfaceControl: SurfaceControlCompat,
    transaction: SurfaceControlCompat.Transaction
): Unit

Optional callback invoked when rendering to the multi buffered layer is complete but before the buffers are submitted to the hardware compositor. This provides consumers a mechanism for synchronizing the transaction with other SurfaceControlCompat objects that maybe rendered within the scene.

Parameters
`frontBufferedLayerSurfaceControl: SurfaceControlCompat`	Handle to the `SurfaceControlCompat` where the front buffered layer content is drawn. This can be used to configure various properties of the `SurfaceControlCompat` like z-ordering or visibility with the corresponding `SurfaceControlCompat.Transaction`.
`multiBufferedLayerSurfaceControl: SurfaceControlCompat`	Handle to the `SurfaceControlCompat` where the multi-buffered layer content is drawn. This can be used to configure various properties of the `SurfaceControlCompat` like z-ordering or visibility with the corresponding `SurfaceControlCompat.Transaction`.
`transaction: SurfaceControlCompat.Transaction`	Current `SurfaceControlCompat.Transaction` to apply updated buffered content to the multi buffered layer.