Presentation

const val LAYOUT_SCALE_TO_FIT = 0: Int

Empty pixels added above and below the input frame (for letterboxing), or to the left and right of the input frame (for pillarboxing), until the desired aspect ratio is achieved. All input frame pixels will be within the output frame.

When applying:

• letterboxing, the output width will default to the input width, and the output height will be scaled appropriately.
• pillarboxing, the output height will default to the input height, and the output width will be scaled appropriately.

const val LAYOUT_SCALE_TO_FIT_WITH_CROP = 1: Int

Pixels cropped from the input frame, until the desired aspect ratio is achieved. Pixels may be cropped either from the bottom and top, or from the left and right sides, of the input frame.

When cropping from the:

• bottom and top, the output width will default to the input width, and the output height will be scaled appropriately.
• left and right, the output height will default to the input height, and the output width will be scaled appropriately.

const val LAYOUT_STRETCH_TO_FIT = 2: Int

Frame stretched larger on the x or y axes to fit the desired aspect ratio.

When stretching to a:

• taller aspect ratio, the output width will default to the input width, and the output height will be scaled appropriately.
• narrower aspect ratio, the output height will default to the input height, and the output width will be scaled appropriately.

fun configure(inputWidth: Int, inputHeight: Int): Size!

Configures the input and output dimensions.

Must be called before getGlMatrixArray.

fun copyWithTextureMinFilter(@C.TextureMinFilter textureMinFilter: Int): Presentation!

Returns a copy with the specified texture minification filter.

fun copyWithUnsetSideRoundedTo(divisor: Int): Presentation!

Returns a copy that will round the unset side length to the given divisor.

java-static fun createForAspectRatio(
    aspectRatio: @FloatRange(from = 0, fromInclusive = false) Float,
    @Presentation.Layout layout: Int
): Presentation!

Creates a new Presentation instance.

The output frame will have the given aspect ratio (width/height ratio). Width or height will be resized to conform to this aspectRatio, given a Layout.

java-static fun createForHeight(height: Int): Presentation!

Creates a new Presentation instance.

The output frame will have the given height. Width will scale to preserve the input aspect ratio. For example, a 1920x1440 video can be scaled to 640x480 by passing a height of 480.

java-static fun createForShortSide(shortSide: Int): Presentation!

Creates a new Presentation instance.

The output frame will have a short side matching the given value. The longest side will scale to preserve the input aspect * ratio. For example, passing a shortSide of 480 will scale a 1440x1920 video to 480x640 or a 1920x1440 video to 640x480.

java-static fun createForWidthAndHeight(
    width: Int,
    height: Int,
    @Presentation.Layout layout: Int
): Presentation!

Creates a new Presentation instance.

The output frame will have the given width and height, given a Layout.

Width and height must be positive integers representing the output frame's width and height.

@C.TextureMinFilter
fun getGlTextureMinFilter(): Int

Returns the texture minification filter to use for sampling the input texture when applying this matrix transformation.

fun getMatrix(presentationTimeUs: Long): Matrix!

Returns the 3x3 transformation Matrix to apply to the frame with the given timestamp.

fun isNoOp(inputWidth: Int, inputHeight: Int): Boolean

Returns whether a GlEffect applies no change at every timestamp.

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