content: /*
   * Copyright 2022 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.google.android.exoplayer2.effect;
  
  import android.graphics.Matrix;
  
  /**
   * Specifies a 3x3 transformation {@link Matrix} to apply in the vertex shader for each frame.
   *
   * <p>The matrix is applied to points given in normalized device coordinates (-1 to 1 on x and y
   * axes). Transformed pixels that are moved outside of the normal device coordinate range are
   * clipped.
   *
   * <p>Output frame pixels outside of the transformed input frame will be black, with alpha = 0 if
   * applicable.
   */
  public interface MatrixTransformation extends GlMatrixTransformation {
    /**
     * Returns the 3x3 transformation {@link Matrix} to apply to the frame with the given timestamp.
     */
    Matrix getMatrix(long presentationTimeUs);
  
    @Override
    default float[] getGlMatrixArray(long presentationTimeUs) {
      return MatrixUtils.getGlMatrixArray(getMatrix(presentationTimeUs));
    }
  }
  