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/*
* 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 a bug
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);
}
}
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