GlMatrixTransformation (ExoPlayer library)

All Superinterfaces:

Effect, GlEffect

All Known Subinterfaces:

MatrixTransformation

All Known Implementing Classes:

Crop, Presentation, ScaleToFitTransformation
```
public interface GlMatrixTransformation
extends GlEffect
```
Specifies a 4x4 transformation Matrix to apply in the vertex shader for each frame.
The matrix is applied to points given in normalized device coordinates (-1 to 1 on x, y, and z axes). Transformed pixels that are moved outside of the normal device coordinate range are clipped.
Output frame pixels outside of the transformed input frame will be black, with alpha = 0 if applicable.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default Pair<Integer,Integer>`	`configure(int inputWidth, int inputHeight)`	Configures the input and output dimensions.
`float[]`	`getGlMatrixArray(long presentationTimeUs)`	Returns the 4x4 transformation `Matrix` to apply to the frame with the given timestamp.
`default SingleFrameGlTextureProcessor`	`toGlTextureProcessor(Context context, boolean useHdr)`	Returns a `SingleFrameGlTextureProcessor` that applies the effect.

- Method Detail
  - configure
```
default Pair<Integer,Integer> configure(int inputWidth,
                                              int inputHeight)
```
    Configures the input and output dimensions.
    Must be called before getGlMatrixArray(long).
    
    Parameters:
    
    inputWidth - The input frame width, in pixels.
    
    inputHeight - The input frame height, in pixels.
    
    Returns:
    
    The output frame width and height, in pixels.
  - getGlMatrixArray
```
float[] getGlMatrixArray(long presentationTimeUs)
```
    Returns the 4x4 transformation Matrix to apply to the frame with the given timestamp.
  - toGlTextureProcessor
```
default SingleFrameGlTextureProcessor toGlTextureProcessor(Context context,
                                                           boolean useHdr)
                                                    throws FrameProcessingException
```
    Description copied from interface: GlEffect
    
    Returns a SingleFrameGlTextureProcessor that applies the effect.
    
    Specified by:
    
    toGlTextureProcessor in interface GlEffect
    
    Parameters:
    
    context - A Context.
    
    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:
    
    FrameProcessingException