AlphaScale

Kotlin |Java

@UnstableApi
public final class AlphaScale implements GlEffect

Scales the alpha value (i.e. the translucency) of a frame.

Summary

Public constructors
`AlphaScale(@FloatRange(from = 0) float alphaScale)` Creates a new instance to scale the entire frame's alpha values by `alphaScale`, to modify translucency.

Public methods
`boolean`	`isNoOp(int inputWidth, int inputHeight)` Returns whether a `GlEffect` applies no change at every timestamp.
`AlphaScaleShaderProgram`	`toGlShaderProgram(Context context, boolean useHdr)` Returns a `GlShaderProgram` that applies the effect.

long

getDurationAfterEffectApplied(long durationUs)

Returns the expected duration of the output stream when the effect is applied given a input durationUs.

public AlphaScale(@FloatRange(from = 0) float alphaScale)

Creates a new instance to scale the entire frame's alpha values by alphaScale, to modify translucency.

An alphaScale value of 1 means no change is applied. A value below 1 increases translucency, and a value above 1 reduces translucency.

public boolean isNoOp(int inputWidth, int inputHeight)

Returns whether a GlEffect applies no change at every timestamp.

This can be used as a hint to skip this instance.

Parameters
`int inputWidth`	The input frame width, in pixels.
`int inputHeight`	The input frame height, in pixels.

public AlphaScaleShaderProgram toGlShaderProgram(Context context, boolean useHdr)

Returns a GlShaderProgram that applies the effect.

Parameters
`Context context`	A `Context`.
`boolean useHdr`	Whether input textures come from an HDR source. If `true`, colors will be in linear RGB BT.2020. If `false`, colors will be in linear RGB BT.709.

Throws
`androidx.media3.common.VideoFrameProcessingException`	If an error occurs while creating the `GlShaderProgram`.