RNCameraViewHelper.java

package org.reactnative.camera;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.media.CamcorderProfile;
import android.os.Build;
import android.support.media.ExifInterface;
import android.util.SparseArray;
import android.view.ViewGroup;

import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.uimanager.UIManagerModule;
import com.google.android.cameraview.CameraView;
import com.google.android.gms.vision.face.Face;
import com.google.android.gms.vision.text.TextBlock;
import com.google.zxing.Result;

import org.reactnative.camera.events.BarCodeReadEvent;
import org.reactnative.camera.events.CameraMountErrorEvent;
import org.reactnative.camera.events.CameraReadyEvent;
import org.reactnative.camera.events.FaceDetectionErrorEvent;
import org.reactnative.camera.events.FacesDetectedEvent;
import org.reactnative.camera.events.TextRecognizedEvent;
import org.reactnative.camera.utils.ImageDimensions;
import org.reactnative.facedetector.RNFaceDetector;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;

public class RNCameraViewHelper {

  public static final String[][] exifTags = new String[][]{
          {"string", ExifInterface.TAG_ARTIST},
          {"int", ExifInterface.TAG_BITS_PER_SAMPLE},
          {"int", ExifInterface.TAG_COMPRESSION},
          {"string", ExifInterface.TAG_COPYRIGHT},
          {"string", ExifInterface.TAG_DATETIME},
          {"string", ExifInterface.TAG_IMAGE_DESCRIPTION},
          {"int", ExifInterface.TAG_IMAGE_LENGTH},
          {"int", ExifInterface.TAG_IMAGE_WIDTH},
          {"int", ExifInterface.TAG_JPEG_INTERCHANGE_FORMAT},
          {"int", ExifInterface.TAG_JPEG_INTERCHANGE_FORMAT_LENGTH},
          {"string", ExifInterface.TAG_MAKE},
          {"string", ExifInterface.TAG_MODEL},
          {"int", ExifInterface.TAG_ORIENTATION},
          {"int", ExifInterface.TAG_PHOTOMETRIC_INTERPRETATION},
          {"int", ExifInterface.TAG_PLANAR_CONFIGURATION},
          {"double", ExifInterface.TAG_PRIMARY_CHROMATICITIES},
          {"double", ExifInterface.TAG_REFERENCE_BLACK_WHITE},
          {"int", ExifInterface.TAG_RESOLUTION_UNIT},
          {"int", ExifInterface.TAG_ROWS_PER_STRIP},
          {"int", ExifInterface.TAG_SAMPLES_PER_PIXEL},
          {"string", ExifInterface.TAG_SOFTWARE},
          {"int", ExifInterface.TAG_STRIP_BYTE_COUNTS},
          {"int", ExifInterface.TAG_STRIP_OFFSETS},
          {"int", ExifInterface.TAG_TRANSFER_FUNCTION},
          {"double", ExifInterface.TAG_WHITE_POINT},
          {"double", ExifInterface.TAG_X_RESOLUTION},
          {"double", ExifInterface.TAG_Y_CB_CR_COEFFICIENTS},
          {"int", ExifInterface.TAG_Y_CB_CR_POSITIONING},
          {"int", ExifInterface.TAG_Y_CB_CR_SUB_SAMPLING},
          {"double", ExifInterface.TAG_Y_RESOLUTION},
          {"double", ExifInterface.TAG_APERTURE_VALUE},
          {"double", ExifInterface.TAG_BRIGHTNESS_VALUE},
          {"string", ExifInterface.TAG_CFA_PATTERN},
          {"int", ExifInterface.TAG_COLOR_SPACE},
          {"string", ExifInterface.TAG_COMPONENTS_CONFIGURATION},
          {"double", ExifInterface.TAG_COMPRESSED_BITS_PER_PIXEL},
          {"int", ExifInterface.TAG_CONTRAST},
          {"int", ExifInterface.TAG_CUSTOM_RENDERED},
          {"string", ExifInterface.TAG_DATETIME_DIGITIZED},
          {"string", ExifInterface.TAG_DATETIME_ORIGINAL},
          {"string", ExifInterface.TAG_DEVICE_SETTING_DESCRIPTION},
          {"double", ExifInterface.TAG_DIGITAL_ZOOM_RATIO},
          {"string", ExifInterface.TAG_EXIF_VERSION},
          {"double", ExifInterface.TAG_EXPOSURE_BIAS_VALUE},
          {"double", ExifInterface.TAG_EXPOSURE_INDEX},
          {"int", ExifInterface.TAG_EXPOSURE_MODE},
          {"int", ExifInterface.TAG_EXPOSURE_PROGRAM},
          {"double", ExifInterface.TAG_EXPOSURE_TIME},
          {"double", ExifInterface.TAG_F_NUMBER},
          {"string", ExifInterface.TAG_FILE_SOURCE},
          {"int", ExifInterface.TAG_FLASH},
          {"double", ExifInterface.TAG_FLASH_ENERGY},
          {"string", ExifInterface.TAG_FLASHPIX_VERSION},
          {"double", ExifInterface.TAG_FOCAL_LENGTH},
          {"int", ExifInterface.TAG_FOCAL_LENGTH_IN_35MM_FILM},
          {"int", ExifInterface.TAG_FOCAL_PLANE_RESOLUTION_UNIT},
          {"double", ExifInterface.TAG_FOCAL_PLANE_X_RESOLUTION},
          {"double", ExifInterface.TAG_FOCAL_PLANE_Y_RESOLUTION},
          {"int", ExifInterface.TAG_GAIN_CONTROL},
          {"int", ExifInterface.TAG_ISO_SPEED_RATINGS},
          {"string", ExifInterface.TAG_IMAGE_UNIQUE_ID},
          {"int", ExifInterface.TAG_LIGHT_SOURCE},
          {"string", ExifInterface.TAG_MAKER_NOTE},
          {"double", ExifInterface.TAG_MAX_APERTURE_VALUE},
          {"int", ExifInterface.TAG_METERING_MODE},
          {"int", ExifInterface.TAG_NEW_SUBFILE_TYPE},
          {"string", ExifInterface.TAG_OECF},
          {"int", ExifInterface.TAG_PIXEL_X_DIMENSION},
          {"int", ExifInterface.TAG_PIXEL_Y_DIMENSION},
          {"string", ExifInterface.TAG_RELATED_SOUND_FILE},
          {"int", ExifInterface.TAG_SATURATION},
          {"int", ExifInterface.TAG_SCENE_CAPTURE_TYPE},
          {"string", ExifInterface.TAG_SCENE_TYPE},
          {"int", ExifInterface.TAG_SENSING_METHOD},
          {"int", ExifInterface.TAG_SHARPNESS},
          {"double", ExifInterface.TAG_SHUTTER_SPEED_VALUE},
          {"string", ExifInterface.TAG_SPATIAL_FREQUENCY_RESPONSE},
          {"string", ExifInterface.TAG_SPECTRAL_SENSITIVITY},
          {"int", ExifInterface.TAG_SUBFILE_TYPE},
          {"string", ExifInterface.TAG_SUBSEC_TIME},
          {"string", ExifInterface.TAG_SUBSEC_TIME_DIGITIZED},
          {"string", ExifInterface.TAG_SUBSEC_TIME_ORIGINAL},
          {"int", ExifInterface.TAG_SUBJECT_AREA},
          {"double", ExifInterface.TAG_SUBJECT_DISTANCE},
          {"int", ExifInterface.TAG_SUBJECT_DISTANCE_RANGE},
          {"int", ExifInterface.TAG_SUBJECT_LOCATION},
          {"string", ExifInterface.TAG_USER_COMMENT},
          {"int", ExifInterface.TAG_WHITE_BALANCE},
          {"int", ExifInterface.TAG_GPS_ALTITUDE_REF},
          {"string", ExifInterface.TAG_GPS_AREA_INFORMATION},
          {"double", ExifInterface.TAG_GPS_DOP},
          {"string", ExifInterface.TAG_GPS_DATESTAMP},
          {"double", ExifInterface.TAG_GPS_DEST_BEARING},
          {"string", ExifInterface.TAG_GPS_DEST_BEARING_REF},
          {"double", ExifInterface.TAG_GPS_DEST_DISTANCE},
          {"string", ExifInterface.TAG_GPS_DEST_DISTANCE_REF},
          {"double", ExifInterface.TAG_GPS_DEST_LATITUDE},
          {"string", ExifInterface.TAG_GPS_DEST_LATITUDE_REF},
          {"double", ExifInterface.TAG_GPS_DEST_LONGITUDE},
          {"string", ExifInterface.TAG_GPS_DEST_LONGITUDE_REF},
          {"int", ExifInterface.TAG_GPS_DIFFERENTIAL},
          {"double", ExifInterface.TAG_GPS_IMG_DIRECTION},
          {"string", ExifInterface.TAG_GPS_IMG_DIRECTION_REF},
          {"string", ExifInterface.TAG_GPS_LATITUDE_REF},
          {"string", ExifInterface.TAG_GPS_LONGITUDE_REF},
          {"string", ExifInterface.TAG_GPS_MAP_DATUM},
          {"string", ExifInterface.TAG_GPS_MEASURE_MODE},
          {"string", ExifInterface.TAG_GPS_PROCESSING_METHOD},
          {"string", ExifInterface.TAG_GPS_SATELLITES},
          {"double", ExifInterface.TAG_GPS_SPEED},
          {"string", ExifInterface.TAG_GPS_SPEED_REF},
          {"string", ExifInterface.TAG_GPS_STATUS},
          {"string", ExifInterface.TAG_GPS_TIMESTAMP},
          {"double", ExifInterface.TAG_GPS_TRACK},
          {"string", ExifInterface.TAG_GPS_TRACK_REF},
          {"string", ExifInterface.TAG_GPS_VERSION_ID},
          {"string", ExifInterface.TAG_INTEROPERABILITY_INDEX},
          {"int", ExifInterface.TAG_THUMBNAIL_IMAGE_LENGTH},
          {"int", ExifInterface.TAG_THUMBNAIL_IMAGE_WIDTH},
          {"int", ExifInterface.TAG_DNG_VERSION},
          {"int", ExifInterface.TAG_DEFAULT_CROP_SIZE},
          {"int", ExifInterface.TAG_ORF_PREVIEW_IMAGE_START},
          {"int", ExifInterface.TAG_ORF_PREVIEW_IMAGE_LENGTH},
          {"int", ExifInterface.TAG_ORF_ASPECT_FRAME},
          {"int", ExifInterface.TAG_RW2_SENSOR_BOTTOM_BORDER},
          {"int", ExifInterface.TAG_RW2_SENSOR_LEFT_BORDER},
          {"int", ExifInterface.TAG_RW2_SENSOR_RIGHT_BORDER},
          {"int", ExifInterface.TAG_RW2_SENSOR_TOP_BORDER},
          {"int", ExifInterface.TAG_RW2_ISO},
  };
  // Mount error event

  public static void emitMountErrorEvent(ViewGroup view) {
    CameraMountErrorEvent event = CameraMountErrorEvent.obtain(view.getId());
    ReactContext reactContext = (ReactContext) view.getContext();
    reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(event);
  }

  // Camera ready event

  public static void emitCameraReadyEvent(ViewGroup view) {
    CameraReadyEvent event = CameraReadyEvent.obtain(view.getId());
    ReactContext reactContext = (ReactContext) view.getContext();
    reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(event);
  }

  // Face detection events

  public static void emitFacesDetectedEvent(
      ViewGroup view,
      SparseArray<Face> faces,
      ImageDimensions dimensions
      ) {
    float density = view.getResources().getDisplayMetrics().density;

    double scaleX = (double) view.getWidth() / (dimensions.getWidth() * density);
    double scaleY = (double) view.getHeight() / (dimensions.getHeight() * density);

    FacesDetectedEvent event = FacesDetectedEvent.obtain(
        view.getId(),
        faces,
        dimensions,
        scaleX,
        scaleY
    );

    ReactContext reactContext = (ReactContext) view.getContext();
    reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(event);
  }

  public static void emitFaceDetectionErrorEvent(ViewGroup view, RNFaceDetector faceDetector) {
    FaceDetectionErrorEvent event = FaceDetectionErrorEvent.obtain(view.getId(), faceDetector);
    ReactContext reactContext = (ReactContext) view.getContext();
    reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(event);
  }

  // Bar code read event

  public static void emitBarCodeReadEvent(ViewGroup view, Result barCode) {
    BarCodeReadEvent event = BarCodeReadEvent.obtain(view.getId(), barCode);
    ReactContext reactContext = (ReactContext) view.getContext();
    reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(event);
  }

  // Text recognition event

  public static void emitTextRecognizedEvent(
      ViewGroup view,
      SparseArray<TextBlock> textBlocks,
      ImageDimensions dimensions) {
    float density = view.getResources().getDisplayMetrics().density;

    double scaleX = (double) view.getWidth() / (dimensions.getWidth() * density);
    double scaleY = (double) view.getHeight() / (dimensions.getHeight() * density);

    TextRecognizedEvent event = TextRecognizedEvent.obtain(
        view.getId(),
        textBlocks,
        dimensions,
        scaleX,
        scaleY
    );

    ReactContext reactContext = (ReactContext) view.getContext();
    reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(event);
  }

  // Utilities

  public static int getCorrectCameraRotation(int rotation, int facing) {
    if (facing == CameraView.FACING_FRONT) {
      return (rotation - 90 + 360) % 360;
    } else {
      return (-rotation + 90 + 360) % 360;
    }
  }

  public static CamcorderProfile getCamcorderProfile(int quality) {
    CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
    switch (quality) {
      case CameraModule.VIDEO_2160P:
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
          profile = CamcorderProfile.get(CamcorderProfile.QUALITY_2160P);
        }
        break;
      case CameraModule.VIDEO_1080P:
        profile = CamcorderProfile.get(CamcorderProfile.QUALITY_1080P);
        break;
      case CameraModule.VIDEO_720P:
        profile = CamcorderProfile.get(CamcorderProfile.QUALITY_720P);
        break;
      case CameraModule.VIDEO_480P:
        profile = CamcorderProfile.get(CamcorderProfile.QUALITY_480P);
        break;
      case CameraModule.VIDEO_4x3:
        profile = CamcorderProfile.get(CamcorderProfile.QUALITY_480P);
        profile.videoFrameWidth = 640;
        break;
    }
    return profile;
  }

  public static WritableMap getExifData(ExifInterface exifInterface) {
    WritableMap exifMap = Arguments.createMap();
    for (String[] tagInfo : exifTags) {
      String name = tagInfo[1];
      if (exifInterface.getAttribute(name) != null) {
        String type = tagInfo[0];
        switch (type) {
          case "string":
            exifMap.putString(name, exifInterface.getAttribute(name));
            break;
          case "int":
            exifMap.putInt(name, exifInterface.getAttributeInt(name, 0));
            break;
          case "double":
            exifMap.putDouble(name, exifInterface.getAttributeDouble(name, 0));
            break;
        }
      }
    }

    double[] latLong = exifInterface.getLatLong();
    if (latLong != null) {
      exifMap.putDouble(ExifInterface.TAG_GPS_LATITUDE, latLong[0]);
      exifMap.putDouble(ExifInterface.TAG_GPS_LONGITUDE, latLong[1]);
      exifMap.putDouble(ExifInterface.TAG_GPS_ALTITUDE, exifInterface.getAltitude(0));
    }

    return exifMap;
  }

  public static Bitmap generateSimulatorPhoto(int width, int height) {
    Bitmap fakePhoto = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(fakePhoto);
    Paint background = new Paint();
    background.setColor(Color.BLACK);
    canvas.drawRect(0, 0, width, height, background);
    Paint textPaint = new Paint();
    textPaint.setColor(Color.YELLOW);
    textPaint.setTextSize(35);
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy.MM.dd G '->' HH:mm:ss z");
    canvas.drawText(simpleDateFormat.format(calendar.getTime()), width * 0.1f, height * 0.2f, textPaint);
    canvas.drawText(simpleDateFormat.format(calendar.getTime()), width * 0.2f, height * 0.4f, textPaint);
    canvas.drawText(simpleDateFormat.format(calendar.getTime()), width * 0.3f, height * 0.6f, textPaint);
    canvas.drawText(simpleDateFormat.format(calendar.getTime()), width * 0.4f, height * 0.8f, textPaint);

    return fakePhoto;
  }
}