fix #56, add a toggle for enabling front camera photo flipping

app/src/main/kotlin/com/simplemobiletools/camera/Config.kt

@@ -42,6 +42,10 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getBoolean(TURN_FLASH_OFF_AT_STARTUP, false)
         set(turnFlashOffAtStartup) = prefs.edit().putBoolean(TURN_FLASH_OFF_AT_STARTUP, turnFlashOffAtStartup).apply()
 
+    var flipPhotos: Boolean
+        get() = prefs.getBoolean(FLIP_PHOTOS, false)
+        set(flipPhotos) = prefs.edit().putBoolean(FLIP_PHOTOS, flipPhotos).apply()
+
     var lastUsedCamera: Int
         get() = prefs.getInt(LAST_USED_CAMERA, Camera.CameraInfo.CAMERA_FACING_BACK)
         set(cameraId) = prefs.edit().putInt(LAST_USED_CAMERA, cameraId).apply()

app/src/main/kotlin/com/simplemobiletools/camera/Constants.kt

@@ -11,6 +11,7 @@ val SOUND = "sound"
 val FOCUS_BEFORE_CAPTURE = "focus_before_capture"
 val VOLUME_BUTTONS_AS_SHUTTER = "volume_buttons_as_shutter"
 val TURN_FLASH_OFF_AT_STARTUP = "turn_flash_off_at_startup"
+val FLIP_PHOTOS = "flip_photos"
 val LAST_USED_CAMERA = "last_used_camera"
 val FLASHLIGHT_STATE = "flashlight_state"
 val BACK_PHOTO_RESOLUTION_INDEX = "back_photo_resolution_index"

app/src/main/kotlin/com/simplemobiletools/camera/PhotoProcessor.kt

@@ -3,6 +3,7 @@ package com.simplemobiletools.camera
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
 import android.graphics.Matrix
+import android.hardware.Camera
 import android.media.ExifInterface
 import android.net.Uri
 import android.os.AsyncTask
@@ -73,6 +74,16 @@ class PhotoProcessor(val activity: MainActivity, val uri: Uri?, val currCameraId
                 image = rotate(image, totalRotation)
             }
 
+            if (currCameraId == Camera.CameraInfo.CAMERA_FACING_FRONT && !activity.config.flipPhotos) {
+                val matrix = Matrix()
+                if (path.startsWith(activity.internalStoragePath)) {
+                    matrix.preScale(1f, -1f)
+                } else {
+                    matrix.preScale(-1f, 1f)
+                }
+                image = Bitmap.createBitmap(image, 0, 0, image.width, image.height, matrix, false)
+            }
+
             if (image != null) {
                 image.compress(Bitmap.CompressFormat.JPEG, 80, fos)
                 fos?.close()

app/src/main/kotlin/com/simplemobiletools/camera/activities/SettingsActivity.kt

@@ -30,6 +30,7 @@ class SettingsActivity : SimpleActivity() {
         setupFocusBeforeCapture()
         setupVolumeButtonsAsShutter()
         setupTurnFlashOffAtStartup()
+        setupFlipPhotos()
         updateTextColors(settings_holder)
     }
 
@@ -108,4 +109,12 @@ class SettingsActivity : SimpleActivity() {
             config.turnFlashOffAtStartup = settings_turn_flash_off_at_startup.isChecked
         }
     }
+
+    private fun setupFlipPhotos() {
+        settings_flip_photos.isChecked = config.flipPhotos
+        settings_flip_photos_holder.setOnClickListener {
+            settings_flip_photos.toggle()
+            config.flipPhotos = settings_flip_photos.isChecked
+        }
+    }
 }

app/src/main/res/layout/activity_settings.xml

@@ -164,5 +164,25 @@
                 android:text="@string/turn_flash_off_at_startup"/>
 
         </RelativeLayout>
+
+        <RelativeLayout
+            android:id="@+id/settings_flip_photos_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_flip_photos"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/flip_front_camera_photos_horizontally"/>
+
+        </RelativeLayout>
     </LinearLayout>
 </ScrollView>

app/src/main/res/values-de/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Vor der Aufnahme fokussieren</string>
     <string name="volume_buttons_as_shutter">Benutze Lautstärkeregler als Shutter</string>
     <string name="turn_flash_off_at_startup">Schalte Blitzlicht bei Start aus</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-es/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Enfocar antes de la captura</string>
     <string name="volume_buttons_as_shutter">Utilizar los botones de volumen como obturador</string>
     <string name="turn_flash_off_at_startup">Turn flash off at startup</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-fr/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Focus before capture</string>
     <string name="volume_buttons_as_shutter">Use volume buttons as shutter</string>
     <string name="turn_flash_off_at_startup">Turn flash off at startup</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-it/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Messa a fuoco prima della cattura</string>
     <string name="volume_buttons_as_shutter">Use volume buttons as shutter</string>
     <string name="turn_flash_off_at_startup">Turn flash off at startup</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-ja/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">キャプチャ前に再度焦点を合わせる</string>
     <string name="volume_buttons_as_shutter">Use volume buttons as shutter</string>
     <string name="turn_flash_off_at_startup">Turn flash off at startup</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-lt/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Focus before capture</string>
     <string name="volume_buttons_as_shutter">Use volume buttons as shutter</string>
     <string name="turn_flash_off_at_startup">Turn flash off at startup</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-nl/strings.xml

@@ -28,6 +28,7 @@
     <string name="focus_before_capture">Focus before capture</string>
     <string name="volume_buttons_as_shutter">Use volume buttons as shutter</string>
     <string name="turn_flash_off_at_startup">Turn flash off at startup</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-pl/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Złap ostrość przed zrobieniem zdjęcia</string>
     <string name="volume_buttons_as_shutter">Używaj przycisków głośności jako spustu migawki</string>
     <string name="turn_flash_off_at_startup">Wyłącz lampę błyskową podczas uruchamiania</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-pt-rBR/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Focus before capture</string>
     <string name="volume_buttons_as_shutter">Use volume buttons as shutter</string>
     <string name="turn_flash_off_at_startup">Turn flash off at startup</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-pt/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Focar antes de capturar</string>
     <string name="volume_buttons_as_shutter">Usar botões de volume como obturador</string>
     <string name="turn_flash_off_at_startup">Desligar flash ao iniciar</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-ru/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Перефокусировка перед захватом</string>
     <string name="volume_buttons_as_shutter">Use volume buttons as shutter</string>
     <string name="turn_flash_off_at_startup">Выключать вспышку при запуске</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-sk/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Zaostriť pred fotením</string>
     <string name="volume_buttons_as_shutter">Použiť tlačidlá na ovládanie hlasitosti ako spúšťač</string>
     <string name="turn_flash_off_at_startup">Vypnúť blesk pri spustení</string>
+    <string name="flip_front_camera_photos_horizontally">Preklopiť fotky z prednej kamera vodorovne</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-sv/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Fokusera om innan bildtagning</string>
     <string name="volume_buttons_as_shutter">Använd volymknapparna som slutare</string>
     <string name="turn_flash_off_at_startup">Stäng av blixten vid start</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values/strings.xml

@@ -27,6 +27,7 @@
     <string name="focus_before_capture">Focus before capture</string>
     <string name="volume_buttons_as_shutter">Use volume buttons as shutter</string>
     <string name="turn_flash_off_at_startup">Turn flash off at startup</string>
+    <string name="flip_front_camera_photos_horizontally">Flip front camera photos horizontally</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->