Android Open Source - esr-scanner Camera Configuration Manager

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2010 ZXing authors/* w  w w .ja  v a2s.c  om*/
 * Copyright 2011 Robert Theis
 *
 * 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 ch.luklanis.esscan.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.View;
import android.view.ViewGroup.LayoutParams;
import android.view.WindowManager;

import java.util.Collection;

import ch.luklanis.esscan.PreferencesActivity;
import ch.luklanis.esscan.camera.exposure.ExposureInterface;
import ch.luklanis.esscan.camera.exposure.ExposureManager;

//import android.view.Display;

/**
 * A class which deals with reading, parsing, and setting the camera parameters
 * which are used to configure the camera hardware.
 * <p/>
 * The code for this class was adapted from the ZXing project:
 * http://code.google.com/p/zxing
 */
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 static final Point sScreenResolution = new Point();

    private final View mPreviewView;
    private Point previewResolution;
    private Point cameraResolution;
    private int mHeightDiff;
    private final ExposureInterface exposure;

    CameraConfigurationManager(View view) {
        this.mPreviewView = view;
        exposure = new ExposureManager().build();
    }

    /**
     * Reads, one time, values from the camera that are needed by the app.
     */
    void initFromCameraParameters(Camera camera) {
        Camera.Parameters parameters = camera.getParameters();

        // int previewWidth = mPreviewView.getWidth();
        int previewHeight = mPreviewView.getHeight();

        Display display = ((WindowManager) mPreviewView.getContext()
                .getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();

        //int screenWidth = display.getWidth();
        //int screenHeight = display.getHeight();

        // uncomment when removing support for API < 13
        display.getSize(sScreenResolution);
        int screenWidth = sScreenResolution.x;
        int screenHeight = sScreenResolution.y;

        // 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 (screenWidth < screenHeight) {
            int temp = screenWidth;
            screenWidth = screenHeight;
            screenHeight = temp;
//      sScreenResolution.set(screenWidth, screenHeight);
        }

        sScreenResolution.set(screenWidth, screenHeight);

        // Camera surface has the same height as the screen. Because of
        // the Notification- and ActionBar preview's height is less than
        // screen's
        // so we had to take notice of it in offset calculation
        this.mHeightDiff = screenHeight - previewHeight;

//        if (previewWidth <= previewHeight) {
//            Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");
//
//            mHeightDiff = screenWidth - previewHeight;
//            previewHeight = (screenHeight - mHeightDiff);
//        }

        int previewWidth = screenWidth;

        cameraResolution = findBestPreviewSizeValue(parameters, sScreenResolution, false);

        LayoutParams params = mPreviewView.getLayoutParams();
        //params.height = screenHeight;
        params.height = previewHeight;
        params.width = previewWidth;
        mPreviewView.setLayoutParams(params);

        previewHeight = screenHeight;

        previewResolution = new Point(previewWidth, previewHeight);
        Log.i(TAG, "Preview resolution: " + previewResolution);

        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(mPreviewView.getContext());

        initializeTorch(parameters, prefs);

        String focusMode = null;
        if (!prefs.getBoolean(PreferencesActivity.KEY_ONLY_MACRO_FOCUS, false)) {
            if (prefs.getBoolean(PreferencesActivity.KEY_NO_CONTINUES_AUTO_FOCUS, true)) {
                focusMode = findSettableValue(parameters.getSupportedFocusModes(),
                        Camera.Parameters.FOCUS_MODE_AUTO);
            } else {
                focusMode = findSettableValue(parameters.getSupportedFocusModes(),
                        "continuous-picture",
                        // Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE
                        // in 4.0+
                        "continuous-video",
                        // Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO
                        // in 4.0+
                        Camera.Parameters.FOCUS_MODE_AUTO);
            }
        }

        // Maybe selected auto-focus but not available, so fall through here:
        if (focusMode == null) {
            focusMode = findSettableValue(parameters.getSupportedFocusModes(),
                    Camera.Parameters.FOCUS_MODE_MACRO,
                    Camera.Parameters.FOCUS_MODE_EDOF);
        }

        if (focusMode != null) {
            parameters.setFocusMode(focusMode);
        }

        parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);
        camera.setParameters(parameters);
    }

    Point getCameraResolution() {
        return cameraResolution;
    }

    Point getPreviewResolution() {
        return previewResolution;
    }

    void setTorch(Camera camera, boolean newSetting) {
        Camera.Parameters parameters = camera.getParameters();
        doSetTorch(parameters, newSetting);
        camera.setParameters(parameters);
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mPreviewView.getContext());
        boolean currentSetting = prefs.getBoolean(PreferencesActivity.KEY_ENABLE_TORCH, false);
        if (currentSetting != newSetting) {
            SharedPreferences.Editor editor = prefs.edit();
            editor.putBoolean(PreferencesActivity.KEY_ENABLE_TORCH, newSetting);
            editor.commit();
        }
    }

    int getHeightDiff() {
        return this.mHeightDiff;
    }

    public void initializeTorch(Camera.Parameters parameters, SharedPreferences prefs) {
        boolean currentSetting = prefs.getBoolean(PreferencesActivity.KEY_ENABLE_TORCH, false);
        doSetTorch(parameters, currentSetting);
    }

    private 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);
        }

        exposure.setExposure(parameters, newSetting);
    }

    private static Point findBestPreviewSizeValue(Camera.Parameters parameters,
                                                  Point screenResolution, boolean portrait) {
        Point bestSize = null;
        int diff = Integer.MAX_VALUE;
        for (Camera.Size supportedPreviewSize : parameters.getSupportedPreviewSizes()) {
            int pixels = supportedPreviewSize.height * supportedPreviewSize.width;
            if (pixels < MIN_PREVIEW_PIXELS) {
                continue;
            }
            int supportedWidth = portrait ? supportedPreviewSize.height : supportedPreviewSize.width;
            int supportedHeight = portrait ? supportedPreviewSize.width : supportedPreviewSize.height;
            int newDiff = Math.abs(screenResolution.x * supportedHeight - supportedWidth * screenResolution.y);
            if (newDiff == 0) {
                bestSize = new Point(supportedWidth, supportedHeight);
                break;
            }
            if (newDiff < diff) {
                bestSize = new Point(supportedWidth, supportedHeight);
                diff = newDiff;
            }
        }
        if (bestSize == null) {
            Camera.Size defaultSize = parameters.getPreviewSize();
            bestSize = new Point(defaultSize.width, defaultSize.height);
        }
        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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