CanvasOverlay

Kotlin |Java

@UnstableApi
public abstract class CanvasOverlay extends BitmapOverlay

java.lang.Object
↳	androidx.media3.effect.TextureOverlay
	↳	androidx.media3.effect.BitmapOverlay
		↳	androidx.media3.effect.CanvasOverlay

A TextOverlay that is backed by a Canvas.

Use this class when the size of the drawing Canvas is known, or when drawing to the entire video size is desied.

Summary

Public constructors
`CanvasOverlay(boolean useInputFrameSize)` Creates a new `CanvasOverlay`.

Public methods
`void`	`configure(Size videoSize)` Set up resources for the overlay given the input video’s dimensions.
`Bitmap`	`getBitmap(long presentationTimeUs)` Returns the overlay bitmap displayed at the specified timestamp.
`abstract void`	`onDraw(Canvas canvas, long presentationTimeUs)` Perform custom drawing onto the `Canvas`.
`void`	`release()` Releases all resources.
`void`	`setCanvasSize(int width, int height)` Sets the size of the `Canvas`.

`static BitmapOverlay`	`createStaticBitmapOverlay(Bitmap overlayBitmap)` Creates a `BitmapOverlay` that shows the `overlayBitmap` in the same position and size throughout the whole video.
`static BitmapOverlay`	`createStaticBitmapOverlay( Bitmap overlayBitmap, StaticOverlaySettings overlaySettings )` Creates a `BitmapOverlay` that shows the `overlayBitmap` in the same throughout the whole video.
`static BitmapOverlay`	`createStaticBitmapOverlay( Context context, Uri overlayBitmapUri, StaticOverlaySettings overlaySettings )` Creates a `BitmapOverlay` that shows the input at `overlayBitmapUri` with the same `StaticOverlaySettings` throughout the whole video.
`int`	`getTextureId(long presentationTimeUs)` Returns the overlay texture identifier displayed at the specified timestamp.
`Size`	`getTextureSize(long presentationTimeUs)` Returns the pixel width and height of the overlay texture displayed at the specified timestamp.
`float[]`	`getVertexTransformation(long presentationTimeUs)` Returns a 4x4 OpenGL matrix, controlling how the vertices of the overlay are displayed at the specified timestamp.

OverlaySettings

getOverlaySettings(long presentationTimeUs)

Returns the OverlaySettings controlling how the overlay is displayed at the specified timestamp.

public CanvasOverlay(boolean useInputFrameSize)

Creates a new CanvasOverlay.

Parameters
`boolean useInputFrameSize`	Whether to create the `Canvas` to match the input frame size, if `false`, `setCanvasSize` must be set before the first invocation to `onDraw`.

public void configure(Size videoSize)

Set up resources for the overlay given the input video’s dimensions.

This method will be called before drawing the first frame and before drawing subsequent frames with different input dimensions.

Parameters
`Size videoSize`	The width and height of the input video, in pixels.

public Bitmap getBitmap(long presentationTimeUs)

Returns the overlay bitmap displayed at the specified timestamp.

Parameters
`long presentationTimeUs`	The presentation timestamp of the current frame, in microseconds.

Throws
`androidx.media3.common.VideoFrameProcessingException`	If an error occurs while processing or drawing the frame.

public abstract void onDraw(Canvas canvas, long presentationTimeUs)

Perform custom drawing onto the Canvas.

Parameters
`Canvas canvas`	The `Canvas` to draw onto.
`long presentationTimeUs`	The presentation timestamp, in microseconds.

public void release()

Releases all resources.

Throws
`androidx.media3.common.VideoFrameProcessingException`	If an error occurs while releasing resources.

public void setCanvasSize(int width, int height)

Sets the size of the Canvas.

The default canvas size will be of the same size as the video frame.

The size will be applied on the next invocation of onDraw.