Android: Generalize and make TextureBufferImpl public

This CL generalizes TextureBufferImpl so it's useful from other contexts than
from a SurfaceTextureHelper, and fixes a bug in cropAndScale(). It also exposes
the class in the api so that clients don't have to duplicate the logic.

Bug: None
Change-Id: Ib82aa8bee025ec14de74a7be9d91fd4e5298a248
Reviewed-on: https://webrtc-review.googlesource.com/69819
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22875}

sdk/android/src/java/org/webrtc/TextureBufferImpl.java

@@ -1,98 +0,0 @@
-/*
- *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-package org.webrtc;
-
-import android.graphics.Matrix;
-import java.nio.ByteBuffer;
-import java.util.concurrent.atomic.AtomicInteger;
-import javax.annotation.Nullable;
-
-/**
- * Android texture buffer backed by a SurfaceTextureHelper's texture. The buffer calls
- * |releaseCallback| when it is released.
- */
-class TextureBufferImpl implements VideoFrame.TextureBuffer {
-  private final int width;
-  private final int height;
-  private final Type type;
-  private final int id;
-  private final Matrix transformMatrix;
-  private final SurfaceTextureHelper surfaceTextureHelper;
-  private final RefCountDelegate refCountDelegate;
-
-  public TextureBufferImpl(int width, int height, Type type, int id, Matrix transformMatrix,
-      SurfaceTextureHelper surfaceTextureHelper, @Nullable Runnable releaseCallback) {
-    this.width = width;
-    this.height = height;
-    this.type = type;
-    this.id = id;
-    this.transformMatrix = transformMatrix;
-    this.surfaceTextureHelper = surfaceTextureHelper;
-    this.refCountDelegate = new RefCountDelegate(releaseCallback);
-  }
-
-  @Override
-  public VideoFrame.TextureBuffer.Type getType() {
-    return type;
-  }
-
-  @Override
-  public int getTextureId() {
-    return id;
-  }
-
-  @Override
-  public Matrix getTransformMatrix() {
-    return transformMatrix;
-  }
-
-  @Override
-  public int getWidth() {
-    return width;
-  }
-
-  @Override
-  public int getHeight() {
-    return height;
-  }
-
-  @Override
-  public VideoFrame.I420Buffer toI420() {
-    return surfaceTextureHelper.textureToYuv(this);
-  }
-
-  @Override
-  public void retain() {
-    refCountDelegate.retain();
-  }
-
-  @Override
-  public void release() {
-    refCountDelegate.release();
-  }
-
-  @Override
-  public VideoFrame.Buffer cropAndScale(
-      int cropX, int cropY, int cropWidth, int cropHeight, int scaleWidth, int scaleHeight) {
-    retain();
-    Matrix newMatrix = new Matrix(transformMatrix);
-    newMatrix.postScale(cropWidth / (float) width, cropHeight / (float) height);
-    newMatrix.postTranslate(cropX / (float) width, cropY / (float) height);
-
-    return new TextureBufferImpl(
-        scaleWidth, scaleHeight, type, id, newMatrix, surfaceTextureHelper, new Runnable() {
-          @Override
-          public void run() {
-            release();
-          }
-        });
-  }
-}