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/*
* Copyright (C) 2012 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.gallery3d.app;
import android.app.Activity;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import android.util.Log;
import android.view.Surface;
import com.android.gallery3d.ui.GLCanvas;
import com.android.gallery3d.ui.ScreenNail;
import com.android.gallery3d.ui.ScreenNailHolder;
import com.android.gallery3d.ui.SurfaceTextureScreenNail;
// This is a ScreenNail which displays camera preview. This demos the usage of
// SurfaceTextureScreenNail. It is not intended for production use.
class CameraScreenNail extends SurfaceTextureScreenNail {
private static final String TAG = "CameraScreenNail";
private static final int CAMERA_ID = 0;
private static final int PREVIEW_WIDTH = 960;
private static final int PREVIEW_HEIGHT = 720;
private static final int MSG_START_CAMERA = 1;
private static final int MSG_STOP_CAMERA = 2;
public interface Listener {
void requestRender();
}
private Activity mActivity;
private Listener mListener;
private int mOrientation;
private Camera mCamera;
private HandlerThread mHandlerThread;
private Handler mHandler;
private volatile boolean mVisible;
private volatile boolean mHasFrame;
public CameraScreenNail(Activity activity, Listener listener) {
mActivity = activity;
mListener = listener;
mOrientation = getCameraDisplayOrientation(mActivity, CAMERA_ID);
if (mOrientation % 180 == 0) {
setSize(PREVIEW_WIDTH, PREVIEW_HEIGHT);
} else {
setSize(PREVIEW_HEIGHT, PREVIEW_WIDTH);
}
mHandlerThread = new HandlerThread("Camera");
mHandlerThread.start();
mHandler = new Handler(mHandlerThread.getLooper()) {
public void handleMessage(Message message) {
if (message.what == MSG_START_CAMERA && mCamera == null) {
startCamera();
} else if (message.what == MSG_STOP_CAMERA && mCamera != null) {
stopCamera();
}
}
};
mHandler.sendEmptyMessage(MSG_START_CAMERA);
}
private void startCamera() {
try {
acquireSurfaceTexture();
Camera camera = Camera.open(CAMERA_ID);
Camera.Parameters param = camera.getParameters();
param.setPreviewSize(PREVIEW_WIDTH, PREVIEW_HEIGHT);
camera.setParameters(param);
camera.setDisplayOrientation(mOrientation);
camera.setPreviewTexture(getSurfaceTexture());
camera.startPreview();
synchronized (this) {
mCamera = camera;
}
} catch (Throwable th) {
Log.e(TAG, "cannot open camera", th);
}
}
private void stopCamera() {
releaseSurfaceTexture();
mCamera.stopPreview();
mCamera.release();
synchronized (this) {
mCamera = null;
notifyAll();
}
mHasFrame = false;
}
@Override
public void draw(GLCanvas canvas, int x, int y, int width, int height) {
if (!mVisible) {
mVisible = true;
// Only send one message when mVisible makes transition from
// false to true.
mHandler.sendEmptyMessage(MSG_START_CAMERA);
}
if (mVisible && mHasFrame) {
super.draw(canvas, x, y, width, height);
}
}
@Override
public void noDraw() {
mVisible = false;
}
@Override
public void pauseDraw() {
mVisible = false;
}
@Override
public void onFrameAvailable(SurfaceTexture surfaceTexture) {
mHasFrame = true;
if (mVisible) {
// We need to ask for re-render if the SurfaceTexture receives a new
// frame (and we are visible).
mListener.requestRender();
}
}
public void destroy() {
synchronized (this) {
mHandler.sendEmptyMessage(MSG_STOP_CAMERA);
// Wait until camera is closed.
while (mCamera != null) {
try {
wait();
} catch (Exception ex) {
// ignore.
}
}
}
mHandlerThread.quit();
}
// The three methods below are copied from Camera.java
private static int getCameraDisplayOrientation(
Activity activity, int cameraId) {
int displayRotation = getDisplayRotation(activity);
int displayOrientation = getDisplayOrientation(
displayRotation, cameraId);
return displayOrientation;
}
private static int getDisplayRotation(Activity activity) {
int rotation = activity.getWindowManager().getDefaultDisplay()
.getRotation();
switch (rotation) {
case Surface.ROTATION_0: return 0;
case Surface.ROTATION_90: return 90;
case Surface.ROTATION_180: return 180;
case Surface.ROTATION_270: return 270;
}
return 0;
}
private static int getDisplayOrientation(int degrees, int cameraId) {
// See android.hardware.Camera.setDisplayOrientation for
// documentation.
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(cameraId, info);
int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
return result;
}
}
// This holds a CameraScreenNail, so we can pass it to a PhotoPage.
class CameraScreenNailHolder extends ScreenNailHolder
implements CameraScreenNail.Listener {
private static final String TAG = "CameraScreenNailHolder";
private GalleryActivity mActivity;
private CameraScreenNail mCameraScreenNail;
public CameraScreenNailHolder(GalleryActivity activity) {
mActivity = activity;
}
@Override
public void requestRender() {
mActivity.getGLRoot().requestRender();
}
@Override
public ScreenNail attach() {
mCameraScreenNail = new CameraScreenNail((Activity) mActivity, this);
return mCameraScreenNail;
}
@Override
public void detach() {
mCameraScreenNail.destroy();
mCameraScreenNail = null;
}
}
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