1 files changed, 177 insertions, 0 deletions
diff --git a/java/com/android/dialer/callcomposer/camera/CameraPreview.java b/java/com/android/dialer/callcomposer/camera/CameraPreview.java
new file mode 100644
index 000000000..6581ad67b
--- /dev/null
+++ b/java/com/android/dialer/callcomposer/camera/CameraPreview.java
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2016 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.android.dialer.callcomposer.camera;
+
+import android.content.Context;
+import android.content.res.Configuration;
+import android.hardware.Camera;
+import android.view.View;
+import android.view.View.MeasureSpec;
+import android.view.View.OnTouchListener;
+import com.android.dialer.common.Assert;
+import com.android.dialer.util.PermissionsUtil;
+import java.io.IOException;
+
+/**
+ * Contains shared code for SoftwareCameraPreview and HardwareCameraPreview, cannot use inheritance
+ * because those classes must inherit from separate Views, so those classes delegate calls to this
+ * helper class. Specifics for each implementation are in CameraPreviewHost
+ */
+public class CameraPreview {
+  /** Implemented by the camera for rendering. */
+  public interface CameraPreviewHost {
+    View getView();
+
+    boolean isValid();
+
+    void startPreview(final Camera camera) throws IOException;
+
+    void onCameraPermissionGranted();
+
+    void setShown();
+  }
+
+  private int mCameraWidth = -1;
+  private int mCameraHeight = -1;
+  private boolean mTabHasBeenShown = false;
+  private OnTouchListener mListener;
+
+  private final CameraPreviewHost mHost;
+
+  public CameraPreview(final CameraPreviewHost host) {
+    Assert.isNotNull(host);
+    Assert.isNotNull(host.getView());
+    mHost = host;
+  }
+
+  // This is set when the tab is actually selected.
+  public void setShown() {
+    mTabHasBeenShown = true;
+    maybeOpenCamera();
+  }
+
+  // Opening camera is very expensive. Most of the ANR reports seem to be related to the camera.
+  // So we delay until the camera is actually needed.  See b/23287938
+  private void maybeOpenCamera() {
+    boolean visible = mHost.getView().getVisibility() == View.VISIBLE;
+    if (mTabHasBeenShown && visible && PermissionsUtil.hasCameraPermissions(getContext())) {
+      CameraManager.get().openCamera();
+    }
+  }
+
+  public void setSize(final Camera.Size size, final int orientation) {
+    switch (orientation) {
+      case 0:
+      case 180:
+        mCameraWidth = size.width;
+        mCameraHeight = size.height;
+        break;
+      case 90:
+      case 270:
+      default:
+        mCameraWidth = size.height;
+        mCameraHeight = size.width;
+    }
+    mHost.getView().requestLayout();
+  }
+
+  public int getWidthMeasureSpec(final int widthMeasureSpec, final int heightMeasureSpec) {
+    if (mCameraHeight >= 0) {
+      final int width = View.MeasureSpec.getSize(widthMeasureSpec);
+      return MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
+    } else {
+      return widthMeasureSpec;
+    }
+  }
+
+  public int getHeightMeasureSpec(final int widthMeasureSpec, final int heightMeasureSpec) {
+    if (mCameraHeight >= 0) {
+      final int orientation = getContext().getResources().getConfiguration().orientation;
+      final int width = View.MeasureSpec.getSize(widthMeasureSpec);
+      final float aspectRatio = (float) mCameraWidth / (float) mCameraHeight;
+      int height;
+      if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
+        height = (int) (width * aspectRatio);
+      } else {
+        height = (int) (width / aspectRatio);
+      }
+      return View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
+    } else {
+      return heightMeasureSpec;
+    }
+  }
+
+  // onVisibilityChanged is set to Visible when the tab is _created_,
+  //   which may be when the user is viewing a different tab.
+  public void onVisibilityChanged(final int visibility) {
+    if (PermissionsUtil.hasCameraPermissions(getContext())) {
+      if (visibility == View.VISIBLE) {
+        maybeOpenCamera();
+      } else {
+        CameraManager.get().closeCamera();
+      }
+    }
+  }
+
+  public Context getContext() {
+    return mHost.getView().getContext();
+  }
+
+  public void setOnTouchListener(final View.OnTouchListener listener) {
+    mListener = listener;
+    mHost.getView().setOnTouchListener(listener);
+  }
+
+  public void setFocusable(boolean focusable) {
+    mHost.getView().setOnTouchListener(focusable ? mListener : null);
+  }
+
+  public int getHeight() {
+    return mHost.getView().getHeight();
+  }
+
+  public void onAttachedToWindow() {
+    maybeOpenCamera();
+  }
+
+  public void onDetachedFromWindow() {
+    CameraManager.get().closeCamera();
+  }
+
+  public void onRestoreInstanceState() {
+    maybeOpenCamera();
+  }
+
+  public void onCameraPermissionGranted() {
+    maybeOpenCamera();
+  }
+
+  /** @return True if the view is valid and prepared for the camera to start showing the preview */
+  public boolean isValid() {
+    return mHost.isValid();
+  }
+
+  /**
+   * Starts the camera preview on the current surface. Abstracts out the differences in API from the
+   * CameraManager
+   *
+   * @throws IOException Which is caught by the CameraManager to display an error
+   */
+  public void startPreview(final Camera camera) throws IOException {
+    mHost.startPreview(camera);
+  }
+}