Move matrix from VideoFrame to TextureBuffer.

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

Index: webrtc/sdk/android/src/java/org/webrtc/TextureBufferImpl.java
diff --git a/webrtc/sdk/android/src/java/org/webrtc/TextureBufferImpl.java b/webrtc/sdk/android/src/java/org/webrtc/TextureBufferImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..ebcb22ff9c5c75692be5cd171fa112f8aebbf0da
--- /dev/null
+++ b/webrtc/sdk/android/src/java/org/webrtc/TextureBufferImpl.java
@@ -0,0 +1,131 @@
+/*
+ *  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;
+
+/**
+ * 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 Runnable releaseCallback;
+  private int refCount;
+
+  public TextureBufferImpl(int width, int height, Type type, int id, Matrix transformMatrix,
+      SurfaceTextureHelper surfaceTextureHelper, Runnable releaseCallback) {
+    this.width = width;
+    this.height = height;
+    this.type = type;
+    this.id = id;
+    this.transformMatrix = transformMatrix;
+    this.surfaceTextureHelper = surfaceTextureHelper;
+    this.releaseCallback = releaseCallback;
+    this.refCount = 1; // Creator implicitly holds a reference.
+  }
+
+  @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() {
+    // SurfaceTextureHelper requires a stride that is divisible by 8.  Round width up.
+    // See SurfaceTextureHelper for details on the size and format.
+    int stride = ((width + 7) / 8) * 8;
+    int uvHeight = (height + 1) / 2;
+    // Due to the layout used by SurfaceTextureHelper, vPos + stride * uvHeight would overrun the
+    // buffer.  Add one row at the bottom to compensate for this.  There will never be data in the
+    // extra row, but now other code does not have to deal with v stride * v height exceeding the
+    // buffer's capacity.
+    int size = stride * (height + uvHeight + 1);
+    ByteBuffer buffer = ByteBuffer.allocateDirect(size);
+    surfaceTextureHelper.textureToYUV(buffer, width, height, stride, id,
+        RendererCommon.convertMatrixFromAndroidGraphicsMatrix(transformMatrix));
+
+    int yPos = 0;
+    int uPos = yPos + stride * height;
+    // Rows of U and V alternate in the buffer, so V data starts after the first row of U.
+    int vPos = uPos + stride / 2;
+
+    buffer.position(yPos);
+    buffer.limit(yPos + stride * height);
+    ByteBuffer dataY = buffer.slice();
+
+    buffer.position(uPos);
+    buffer.limit(uPos + stride * uvHeight);
+    ByteBuffer dataU = buffer.slice();
+
+    buffer.position(vPos);
+    buffer.limit(vPos + stride * uvHeight);
+    ByteBuffer dataV = buffer.slice();
+
+    // SurfaceTextureHelper uses the same stride for Y, U, and V data.
+    return new I420BufferImpl(width, height, dataY, stride, dataU, stride, dataV, stride, null);
+  }
+
+  @Override
+  public void retain() {
+    ++refCount;
+  }
+
+  @Override
+  public void release() {
+    if (--refCount == 0) {
+      releaseCallback.run();
+    }
+  }
+
+  @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();
+          }
+        });
+  }
+}