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 static com.google.common.truth.Truth.assertThat;
  
  import android.util.Pair;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /**
   * Unit tests for {@link ScaleToFitTransformation}.
   *
   * <p>See {@code MatrixTextureProcessorPixelTest} for pixel tests testing {@link
   * MatrixTextureProcessor} given a transformation matrix.
   */
  @RunWith(AndroidJUnit4.class)
  public final class ScaleToFitTransformationTest {
  
    @Test
    public void configure_noEdits_leavesFramesUnchanged() {
      int inputWidth = 200;
      int inputHeight = 150;
      ScaleToFitTransformation scaleToFitTransformation =
          new ScaleToFitTransformation.Builder().build();
  
      Pair<Integer, Integer> outputSize = scaleToFitTransformation.configure(inputWidth, inputHeight);
  
      assertThat(outputSize.first).isEqualTo(inputWidth);
      assertThat(outputSize.second).isEqualTo(inputHeight);
    }
  
    @Test
    public void configure_scaleNarrow_decreasesWidth() {
      int inputWidth = 200;
      int inputHeight = 150;
      ScaleToFitTransformation scaleToFitTransformation =
          new ScaleToFitTransformation.Builder()
              .setScale(/* scaleX= */ .5f, /* scaleY= */ 1f)
              .build();
  
      Pair<Integer, Integer> outputSize = scaleToFitTransformation.configure(inputWidth, inputHeight);
  
      assertThat(outputSize.first).isEqualTo(Math.round(inputWidth * .5f));
      assertThat(outputSize.second).isEqualTo(inputHeight);
    }
  
    @Test
    public void configure_scaleWide_increasesWidth() {
      int inputWidth = 200;
      int inputHeight = 150;
      ScaleToFitTransformation scaleToFitTransformation =
          new ScaleToFitTransformation.Builder().setScale(/* scaleX= */ 2f, /* scaleY= */ 1f).build();
  
      Pair<Integer, Integer> outputSize = scaleToFitTransformation.configure(inputWidth, inputHeight);
  
      assertThat(outputSize.first).isEqualTo(inputWidth * 2);
      assertThat(outputSize.second).isEqualTo(inputHeight);
    }
  
    @Test
    public void configure_scaleTall_increasesHeight() {
      int inputWidth = 200;
      int inputHeight = 150;
      ScaleToFitTransformation scaleToFitTransformation =
          new ScaleToFitTransformation.Builder().setScale(/* scaleX= */ 1f, /* scaleY= */ 2f).build();
  
      Pair<Integer, Integer> outputSize = scaleToFitTransformation.configure(inputWidth, inputHeight);
  
      assertThat(outputSize.first).isEqualTo(inputWidth);
      assertThat(outputSize.second).isEqualTo(inputHeight * 2);
    }
  
    @Test
    public void configure_rotate90_swapsDimensions() {
      int inputWidth = 200;
      int inputHeight = 150;
      ScaleToFitTransformation scaleToFitTransformation =
          new ScaleToFitTransformation.Builder().setRotationDegrees(90).build();
  
      Pair<Integer, Integer> outputSize = scaleToFitTransformation.configure(inputWidth, inputHeight);
  
      assertThat(outputSize.first).isEqualTo(inputHeight);
      assertThat(outputSize.second).isEqualTo(inputWidth);
    }
  
    @Test
    public void configure_rotate45_changesDimensions() {
      int inputWidth = 200;
      int inputHeight = 150;
      ScaleToFitTransformation scaleToFitTransformation =
          new ScaleToFitTransformation.Builder().setRotationDegrees(45).build();
      long expectedOutputWidthHeight = 247;
  
      Pair<Integer, Integer> outputSize = scaleToFitTransformation.configure(inputWidth, inputHeight);
  
      assertThat(outputSize.first).isEqualTo(expectedOutputWidthHeight);
      assertThat(outputSize.second).isEqualTo(expectedOutputWidthHeight);
    }
  }
  