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+/*
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+ * Copyright (C) 2008 ZXing authors
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package com.uas.equipment.camera;
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+
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+import android.content.Context;
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+import android.graphics.PixelFormat;
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+import android.graphics.Point;
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+import android.graphics.Rect;
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+import android.hardware.Camera;
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+import android.os.Build;
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+import android.os.Handler;
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+import android.view.SurfaceHolder;
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+
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+import java.io.IOException;
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+
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+/**
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+ * This object wraps the Camera service object and expects to be the only one talking to it. The
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+ * implementation encapsulates the steps needed to take preview-sized images, which are used for
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+ * both preview and decoding.
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+ */
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+public final class CameraManager {
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+
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+ private static final String TAG = CameraManager.class.getSimpleName();
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+
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+ public static int FRAME_WIDTH = -1;
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+ public static int FRAME_HEIGHT = -1;
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+ public static int FRAME_MARGINTOP = -1;
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+
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+ private static CameraManager cameraManager;
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+
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+ static final int SDK_INT; // Later we can use Build.VERSION.SDK_INT
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+
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+ static {
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+ int sdkInt;
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+ try {
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+ sdkInt = Integer.parseInt(Build.VERSION.SDK);
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+ } catch (NumberFormatException nfe) {
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+ // Just to be safe
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+ sdkInt = 10000;
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+ }
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+ SDK_INT = sdkInt;
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+ }
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+
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+ private final Context context;
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+ private final CameraConfigurationManager configManager;
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+ private Camera camera;
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+ private Rect framingRect;
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+ private Rect framingRectInPreview;
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+ private boolean initialized;
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+ private boolean previewing;
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+ private final boolean useOneShotPreviewCallback;
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+ /**
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+ * Preview frames are delivered here, which we pass on to the registered handler. Make sure to
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+ * clear the handler so it will only receive one message.
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+ */
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+ private final PreviewCallback previewCallback;
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+ /**
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+ * Autofocus callbacks arrive here, and are dispatched to the Handler which requested them.
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+ */
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+ private final AutoFocusCallback autoFocusCallback;
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+
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+ /**
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+ * Initializes this static object with the Context of the calling Activity.
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+ *
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+ * @param context The Activity which wants to use the camera.
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+ */
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+ public static void init(Context context) {
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+ if (cameraManager == null) {
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+ cameraManager = new CameraManager(context);
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+ }
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+ }
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+
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+ /**
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+ * Gets the CameraManager singleton instance.
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+ *
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+ * @return A reference to the CameraManager singleton.
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+ */
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+ public static CameraManager get() {
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+ return cameraManager;
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+ }
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+
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+ private CameraManager(Context context) {
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+
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+ this.context = context;
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+ this.configManager = new CameraConfigurationManager(context);
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+
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+ // Camera.setOneShotPreviewCallback() has a race condition in Cupcake, so we use the older
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+ // Camera.setPreviewCallback() on 1.5 and earlier. For Donut and later, we need to use
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+ // the more efficient one shot callback, as the older one can swamp the system and cause it
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+ // to run out of memory. We can't use SDK_INT because it was introduced in the Donut SDK.
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+ //useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > Build.VERSION_CODES.CUPCAKE;
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+ useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > 3; // 3 = Cupcake
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+
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+ previewCallback = new PreviewCallback(configManager, useOneShotPreviewCallback);
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+ autoFocusCallback = new AutoFocusCallback();
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+ }
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+
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+ /**
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+ * Opens the camera driver and initializes the hardware parameters.
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+ *
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+ * @param holder The surface object which the camera will draw preview frames into.
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+ * @throws IOException Indicates the camera driver failed to open.
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+ */
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+ public void openDriver(SurfaceHolder holder) throws IOException {
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+ if (camera == null) {
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+ camera = Camera.open();
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+ if (camera == null) {
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+ throw new IOException();
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+ }
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+ camera.setPreviewDisplay(holder);
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+
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+ if (!initialized) {
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+ initialized = true;
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+ configManager.initFromCameraParameters(camera);
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+ }
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+ configManager.setDesiredCameraParameters(camera);
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+
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+ //FIXME
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+ // SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
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+ //�Ƿ�ʹ��ǰ��
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+// if (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false)) {
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+// FlashlightManager.enableFlashlight();
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+// }
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+ FlashlightManager.enableFlashlight();
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+ }
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+ }
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+
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+ /**
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+ * Closes the camera driver if still in use.
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+ */
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+ public void closeDriver() {
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+ if (camera != null) {
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+ FlashlightManager.disableFlashlight();
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+ camera.release();
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+ camera = null;
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+ }
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+ }
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+
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+ /**
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+ * Asks the camera hardware to begin drawing preview frames to the screen.
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+ */
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+ public void startPreview() {
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+ if (camera != null && !previewing) {
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+ camera.startPreview();
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+ previewing = true;
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+ }
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+ }
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+
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+ /**
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+ * Tells the camera to stop drawing preview frames.
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+ */
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+ public void stopPreview() {
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+ if (camera != null && previewing) {
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+ if (!useOneShotPreviewCallback) {
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+ camera.setPreviewCallback(null);
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+ }
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+ camera.stopPreview();
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+ previewCallback.setHandler(null, 0);
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+ autoFocusCallback.setHandler(null, 0);
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+ previewing = false;
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+ }
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+ }
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+
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+ /**
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+ * A single preview frame will be returned to the handler supplied. The data will arrive as byte[]
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+ * in the message.obj field, with width and height encoded as message.arg1 and message.arg2,
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+ * respectively.
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+ *
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+ * @param handler The handler to send the message to.
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+ * @param message The what field of the message to be sent.
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+ */
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+ public void requestPreviewFrame(Handler handler, int message) {
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+ if (camera != null && previewing) {
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+ previewCallback.setHandler(handler, message);
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+ if (useOneShotPreviewCallback) {
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+ camera.setOneShotPreviewCallback(previewCallback);
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+ } else {
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+ camera.setPreviewCallback(previewCallback);
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+ }
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+ }
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+ }
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+
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+ /**
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+ * Asks the camera hardware to perform an autofocus.
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+ *
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+ * @param handler The Handler to notify when the autofocus completes.
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+ * @param message The message to deliver.
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+ */
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+ public void requestAutoFocus(Handler handler, int message) {
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+ if (camera != null && previewing) {
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+ autoFocusCallback.setHandler(handler, message);
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+ //Log.d(TAG, "Requesting auto-focus callback");
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+ camera.autoFocus(autoFocusCallback);
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+ }
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+ }
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+
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+ /**
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+ * Calculates the framing rect which the UI should draw to show the user where to place the
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+ * barcode. This target helps with alignment as well as forces the user to hold the device
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+ * far enough away to ensure the image will be in focus.
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+ *
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+ * @return The rectangle to draw on screen in window coordinates.
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+ */
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+ public Rect getFramingRect() {
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+ Point screenResolution = configManager.getScreenResolution();
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+ // if (framingRect == null) {
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+ if (camera == null) {
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+ return null;
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+ }
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+
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+ int leftOffset = (screenResolution.x - FRAME_WIDTH) / 2;
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+
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+ int topOffset = 0;
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+ if (FRAME_MARGINTOP != -1) {
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+ topOffset = FRAME_MARGINTOP;
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+ } else {
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+ topOffset = (screenResolution.y - FRAME_HEIGHT) / 2;
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+ }
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+ framingRect = new Rect(leftOffset, topOffset, leftOffset + FRAME_WIDTH, topOffset + FRAME_HEIGHT);
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+ // }
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+ return framingRect;
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+ }
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+
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+ /**
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+ * Like {@link #getFramingRect} but coordinates are in terms of the preview frame,
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+ * not UI / screen.
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+ */
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+ public Rect getFramingRectInPreview() {
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+ if (framingRectInPreview == null) {
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+ Rect rect = new Rect(getFramingRect());
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+ Point cameraResolution = configManager.getCameraResolution();
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+ Point screenResolution = configManager.getScreenResolution();
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+ //modify here
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+// rect.left = rect.left * cameraResolution.x / screenResolution.x;
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+// rect.right = rect.right * cameraResolution.x / screenResolution.x;
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+// rect.top = rect.top * cameraResolution.y / screenResolution.y;
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+// rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;
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+ rect.left = rect.left * cameraResolution.y / screenResolution.x;
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+ rect.right = rect.right * cameraResolution.y / screenResolution.x;
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+ rect.top = rect.top * cameraResolution.x / screenResolution.y;
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+ rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
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+ framingRectInPreview = rect;
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+ }
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+ return framingRectInPreview;
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+ }
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+
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+ /**
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+ * Converts the result points from still resolution coordinates to screen coordinates.
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+ *
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+ * @param points The points returned by the Reader subclass through Result.getResultPoints().
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+ * @return An array of Points scaled to the size of the framing rect and offset appropriately
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+ * so they can be drawn in screen coordinates.
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+ */
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+ /*
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+ public Point[] convertResultPoints(ResultPoint[] points) {
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+ Rect frame = getFramingRectInPreview();
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+ int count = points.length;
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+ Point[] output = new Point[count];
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+ for (int x = 0; x < count; x++) {
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+ output[x] = new Point();
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+ output[x].x = frame.left + (int) (points[x].getX() + 0.5f);
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+ output[x].y = frame.top + (int) (points[x].getY() + 0.5f);
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+ }
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+ return output;
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+ }
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+ */
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+
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+ /**
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+ * A factory method to build the appropriate LuminanceSource object based on the format
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+ * of the preview buffers, as described by Camera.Parameters.
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+ *
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+ * @param data A preview frame.
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+ * @param width The width of the image.
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+ * @param height The height of the image.
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+ * @return A PlanarYUVLuminanceSource instance.
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+ */
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+ public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {
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+ Rect rect = getFramingRectInPreview();
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+ int previewFormat = configManager.getPreviewFormat();
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+ String previewFormatString = configManager.getPreviewFormatString();
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+ switch (previewFormat) {
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+ // This is the standard Android format which all devices are REQUIRED to support.
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+ // In theory, it's the only one we should ever care about.
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+ case PixelFormat.YCbCr_420_SP:
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+ // This format has never been seen in the wild, but is compatible as we only care
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+ // about the Y channel, so allow it.
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+ case PixelFormat.YCbCr_422_SP:
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+ return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top,
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+ rect.width(), rect.height());
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+ default:
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+ // The Samsung Moment incorrectly uses this variant instead of the 'sp' version.
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+ // Fortunately, it too has all the Y data up front, so we can read it.
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+ if ("yuv420p".equals(previewFormatString)) {
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+ return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top,
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+ rect.width(), rect.height());
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+ }
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+ }
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+ throw new IllegalArgumentException("Unsupported picture format: " +
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+ previewFormat + '/' + previewFormatString);
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+ }
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+
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+ public Context getContext() {
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+ return context;
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+ }
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+
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+ public Camera getCamera() {
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+ return camera;
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+ }
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+
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+ public boolean isPreviewing() {
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+ return previewing;
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+ }
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+
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+ public boolean isUseOneShotPreviewCallback() {
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+ return useOneShotPreviewCallback;
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+ }
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+
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+ public PreviewCallback getPreviewCallback() {
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+ return previewCallback;
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+ }
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+
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+ public AutoFocusCallback getAutoFocusCallback() {
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+ return autoFocusCallback;
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+ }
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+
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+ public void setPreviewing(boolean previewing) {
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+ this.previewing = previewing;
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+ }
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+}
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