/*
* Copyright (C) 2010 ZXing authors
*
* 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.oc.mobilsecurity.qr.camera;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Point;
import android.hardware.Camera;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;
/**
* A class which deals with reading, parsing, and setting the camera parameters
* which are used to configure the camera hardware.
*/
final class CameraConfigurationManager {
private static final String TAG = "CameraConfiguration";
private final Context context;
private Point screenResolution;
private Point cameraResolution;
CameraConfigurationManager(Context context) {
this.context = context;
}
/**
* Reads, one time, values from the camera that are needed by the app.
*/
void initFromCameraParameters(Camera camera) {
Camera.Parameters parameters = camera.getParameters();
WindowManager manager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
Point theScreenResolution = new Point();
display.getSize(theScreenResolution);
screenResolution = theScreenResolution;
Log.i(TAG, "Screen resolution: " + screenResolution);
Point screenResolutionForCamera = new Point();
screenResolutionForCamera.x = screenResolution.x;
screenResolutionForCamera.y = screenResolution.y;
if (screenResolution.x < screenResolution.y) {
screenResolutionForCamera.x = screenResolution.y;
screenResolutionForCamera.y = screenResolution.x;
}
cameraResolution = CameraConfigurationUtils.findBestPreviewSizeValue(
parameters, screenResolutionForCamera);
Log.i(TAG, "Camera resolution: " + cameraResolution);
}
void setDesiredCameraParameters(Camera camera, boolean safeMode) {
Camera.Parameters parameters = camera.getParameters();
camera.setDisplayOrientation(90);
if (parameters == null) {
Log.w(TAG,
"Device error: no camera parameters are available. Proceeding without configuration.");
return;
}
Log.i(TAG, "Initial camera parameters: " + parameters.flatten());
if (safeMode) {
Log.w(TAG,
"In camera config safe mode -- most settings will not be honored");
}
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context);
initializeTorch(parameters, prefs, safeMode);
CameraConfigurationUtils.setBestPreviewFPS(parameters);
CameraConfigurationUtils.setFocus(parameters,
prefs.getBoolean("preferences_auto_focus", true),
prefs.getBoolean("preferences_disable_continuous_focus", true),
safeMode);
if (!safeMode) {
if (prefs.getBoolean("preferences_invert_scan", false)) {
CameraConfigurationUtils.setInvertColor(parameters);
}
if (!prefs.getBoolean("preferences_disable_barcode_scene_mode",
true)) {
CameraConfigurationUtils.setBarcodeSceneMode(parameters);
}
if (!prefs.getBoolean("preferences_disable_metering", true)) {
CameraConfigurationUtils.setVideoStabilization(parameters);
CameraConfigurationUtils.setFocusArea(parameters);
CameraConfigurationUtils.setMetering(parameters);
}
}
parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);
camera.setParameters(parameters);
Camera.Parameters afterParameters = camera.getParameters();
Camera.Size afterSize = afterParameters.getPreviewSize();
if (afterSize != null
&& (cameraResolution.x != afterSize.width || cameraResolution.y != afterSize.height)) {
Log.w(TAG, "Camera said it supported preview size "
+ cameraResolution.x + 'x' + cameraResolution.y
+ ", but after setting it, preview size is "
+ afterSize.width + 'x' + afterSize.height);
cameraResolution.x = afterSize.width;
cameraResolution.y = afterSize.height;
}
}
Point getCameraResolution() {
return cameraResolution;
}
Point getScreenResolution() {
return screenResolution;
}
boolean getTorchState(Camera camera) {
if (camera != null) {
Camera.Parameters parameters = camera.getParameters();
if (parameters != null) {
String flashMode = camera.getParameters().getFlashMode();
return flashMode != null
&& (Camera.Parameters.FLASH_MODE_ON.equals(flashMode) || Camera.Parameters.FLASH_MODE_TORCH
.equals(flashMode));
}
}
return false;
}
void setTorch(Camera camera, boolean newSetting) {
Camera.Parameters parameters = camera.getParameters();
doSetTorch(parameters, newSetting, false);
camera.setParameters(parameters);
}
private void initializeTorch(Camera.Parameters parameters,
SharedPreferences prefs, boolean safeMode) {
boolean currentSetting = FrontLightMode.readPref(prefs) == FrontLightMode.ON;
doSetTorch(parameters, currentSetting, safeMode);
}
private void doSetTorch(Camera.Parameters parameters, boolean newSetting,
boolean safeMode) {
CameraConfigurationUtils.setTorch(parameters, newSetting);
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context);
if (!safeMode
&& !prefs.getBoolean("preferences_disable_exposure", true)) {
CameraConfigurationUtils.setBestExposure(parameters, newSetting);
}
}
}