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/*
* 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.google.zxing.client.android.camera;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Point;
import android.hardware.Camera;
import android.os.Build;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;
import com.google.zxing.client.android.PreferencesActivity;
import java.util.Collection;
import java.util.List;
/**
* 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 static final int MIN_PREVIEW_PIXELS = 320 * 240; // small screen
private static final int MAX_PREVIEW_PIXELS = 800 * 480; // large/HD screen
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();
int width = display.getWidth();
int height = display.getHeight();
// We're landscape-only, and have apparently seen issues with display thinking it's portrait
// when waking from sleep. If it's not landscape, assume it's mistaken and reverse them:
if (width < height) {
Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");
int temp = width;
width = height;
height = temp;
}
screenResolution = new Point(width, height);
Log.i(TAG, "Screen resolution: " + screenResolution);
cameraResolution = findBestPreviewSizeValue(parameters, screenResolution);
Log.i(TAG, "Camera resolution: " + cameraResolution);
}
void setDesiredCameraParameters(Camera camera) {
Camera.Parameters parameters = camera.getParameters();
if (parameters == null) {
Log.w(TAG, "Device error: no camera parameters are available. Proceeding without configuration.");
return;
}
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
initializeTorch(parameters, prefs);
String focusMode = findSettableValue(parameters.getSupportedFocusModes(),
Camera.Parameters.FOCUS_MODE_AUTO,
Camera.Parameters.FOCUS_MODE_MACRO);
if (focusMode != null) {
parameters.setFocusMode(focusMode);
}
parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);
camera.setParameters(parameters);
}
Point getCameraResolution() {
return cameraResolution;
}
Point getScreenResolution() {
return screenResolution;
}
void setTorch(Camera camera, boolean newSetting) {
Camera.Parameters parameters = camera.getParameters();
doSetTorch(parameters, newSetting);
camera.setParameters(parameters);
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean currentSetting = prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false);
if (currentSetting != newSetting) {
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean(PreferencesActivity.KEY_FRONT_LIGHT, newSetting);
editor.commit();
}
}
private static void initializeTorch(Camera.Parameters parameters, SharedPreferences prefs) {
boolean currentSetting = prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false);
doSetTorch(parameters, currentSetting);
}
private static void doSetTorch(Camera.Parameters parameters, boolean newSetting) {
String flashMode;
if (newSetting) {
flashMode = findSettableValue(parameters.getSupportedFlashModes(),
Camera.Parameters.FLASH_MODE_TORCH,
Camera.Parameters.FLASH_MODE_ON);
} else {
flashMode = findSettableValue(parameters.getSupportedFlashModes(),
Camera.Parameters.FLASH_MODE_OFF);
}
if (flashMode != null) {
parameters.setFlashMode(flashMode);
}
}
private Point findBestPreviewSizeValue(Camera.Parameters parameters, Point screenResolution) {
List<Camera.Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes();
if (Log.isLoggable(TAG, Log.INFO)) {
StringBuilder previewSizesString = new StringBuilder();
for (Camera.Size supportedPreviewSize : supportedPreviewSizes) {
previewSizesString.append(supportedPreviewSize.width).append('x')
.append(supportedPreviewSize.height).append(' ');
}
Log.i(TAG, "Supported preview sizes: " + previewSizesString);
}
Point bestSize = null;
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
// Force this on every time for Optimus, since we know it has this problem
if (Build.MODEL.contains("optimus") || Build.MODEL.contains("Optimus") ||
Build.DEVICE.contains("optimus") || Build.DEVICE.contains("Optimus")) {
if (!prefs.getBoolean(PreferencesActivity.KEY_FORCE_PREVIEW_TO_SCREEN_SIZE, false)) {
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean(PreferencesActivity.KEY_FORCE_PREVIEW_TO_SCREEN_SIZE, true);
editor.commit();
}
}
if (prefs.getBoolean(PreferencesActivity.KEY_FORCE_PREVIEW_TO_SCREEN_SIZE, false)) {
Log.i(TAG, "Forcing to screen size");
for (Camera.Size supportedPreviewSize : supportedPreviewSizes) {
int realWidth = supportedPreviewSize.width;
int realHeight = supportedPreviewSize.height;
boolean isCandidatePortrait = realWidth < realHeight;
int maybeFlippedWidth = isCandidatePortrait ? realHeight : realWidth;
int maybeFlippedHeight = isCandidatePortrait ? realWidth : realHeight;
if (maybeFlippedWidth == screenResolution.x && maybeFlippedHeight == screenResolution.y) {
bestSize = new Point(realWidth, realHeight);
break;
}
}
} else {
int diff = Integer.MAX_VALUE;
for (Camera.Size supportedPreviewSize : supportedPreviewSizes) {
int realWidth = supportedPreviewSize.width;
int realHeight = supportedPreviewSize.height;
int pixels = realWidth * realHeight;
if (pixels < MIN_PREVIEW_PIXELS || pixels > MAX_PREVIEW_PIXELS) {
continue;
}
boolean isCandidatePortrait = realWidth < realHeight;
int maybeFlippedWidth = isCandidatePortrait ? realHeight : realWidth;
int maybeFlippedHeight = isCandidatePortrait ? realWidth : realHeight;
int newDiff = Math.abs(screenResolution.x * maybeFlippedHeight - screenResolution.y * maybeFlippedWidth);
if (newDiff == 0) {
bestSize = new Point(realWidth, realHeight);
break;
}
if (newDiff < diff) {
bestSize = new Point(realWidth, realHeight);
diff = newDiff;
}
}
}
if (bestSize == null) {
Camera.Size defaultSize = parameters.getPreviewSize();
bestSize = new Point(defaultSize.width, defaultSize.height);
Log.i(TAG, "No suitable preview sizes, using default: " + bestSize);
}
return bestSize;
}
private static String findSettableValue(Collection<String> supportedValues,
String... desiredValues) {
Log.i(TAG, "Supported values: " + supportedValues);
String result = null;
if (supportedValues != null) {
for (String desiredValue : desiredValues) {
if (supportedValues.contains(desiredValue)) {
result = desiredValue;
break;
}
}
}
Log.i(TAG, "Settable value: " + result);
return result;
}
}
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