From 0b6f0abda07b8a9ff3daa1722a254087f30eec08 Mon Sep 17 00:00:00 2001
From: Joao Fidelis <joaogfidelis@gmail.com>
Date: Wed, 14 Feb 2018 10:48:21 -0200
Subject: [PATCH] feat(mirror): add option to give "mirrorImage" flag to
 takePicture.

---
 .../tasks/ResolveTakenPictureAsyncTask.java   | 10 ++++++++
 ios/RN/RNCamera.m                             |  9 ++++++++
 ios/RN/RNImageUtils.h                         |  1 +
 ios/RN/RNImageUtils.m                         | 23 +++++++++++++++++++
 4 files changed, 43 insertions(+)

diff --git a/android/src/main/java/org/reactnative/camera/tasks/ResolveTakenPictureAsyncTask.java b/android/src/main/java/org/reactnative/camera/tasks/ResolveTakenPictureAsyncTask.java
index ef8b69677..e8976de3a 100644
--- a/android/src/main/java/org/reactnative/camera/tasks/ResolveTakenPictureAsyncTask.java
+++ b/android/src/main/java/org/reactnative/camera/tasks/ResolveTakenPictureAsyncTask.java
@@ -73,6 +73,10 @@ protected WritableMap doInBackground(Void... voids) {
                   mBitmap = rotateBitmap(mBitmap, getImageRotation(orientation));
               }
 
+              if (mOptions.hasKey("mirrorImage") && mOptions.getBoolean("mirrorImage")) {
+                  mBitmap = flipHorizontally(mBitmap);
+              }
+
               // Write Exif data to the response if requested
               if (mOptions.hasKey("exif") && mOptions.getBoolean("exif")) {
                   WritableMap exifData = RNCameraViewHelper.getExifData(exifInterface);
@@ -133,6 +137,12 @@ private Bitmap rotateBitmap(Bitmap source, int angle) {
         return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
     }
 
+    private Bitmap flipHorizontally(Bitmap source) {
+        Matrix matrix = new Matrix();
+        matrix.preScale(-1.0f, 1.0f);
+        return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
+    }
+
     // Get rotation degrees from Exif orientation enum
 
     private int getImageRotation(int orientation) {
diff --git a/ios/RN/RNCamera.m b/ios/RN/RNCamera.m
index 14922319f..dc61b5592 100644
--- a/ios/RN/RNCamera.m
+++ b/ios/RN/RNCamera.m
@@ -322,6 +322,10 @@ - (void)takePicture:(NSDictionary *)options resolve:(RCTPromiseResolveBlock)reso
             CGRect cropRect = CGRectMake(frame.origin.x * width, frame.origin.y * height, frame.size.width * width, frame.size.height * height);
             takenImage = [RNImageUtils cropImage:takenImage toRect:cropRect];
             
+            if ([options[@"mirrorImage"] boolValue]) {
+                takenImage = [RNImageUtils mirrorImage:takenImage];
+            }
+            
             NSMutableDictionary *response = [[NSMutableDictionary alloc] init];
             float quality = [options[@"quality"] floatValue];
             NSData *takenImageData = UIImageJPEGRepresentation(takenImage, quality);
@@ -338,16 +342,21 @@ - (void)takePicture:(NSDictionary *)options resolve:(RCTPromiseResolveBlock)reso
                 int imageRotation;
                 switch (takenImage.imageOrientation) {
                     case UIImageOrientationLeft:
+                    case UIImageOrientationRightMirrored:
                         imageRotation = 90;
                         break;
                     case UIImageOrientationRight:
+                    case UIImageOrientationLeftMirrored:
                         imageRotation = -90;
                         break;
                     case UIImageOrientationDown:
+                    case UIImageOrientationDownMirrored:
                         imageRotation = 180;
                         break;
+                    case UIImageOrientationUpMirrored:
                     default:
                         imageRotation = 0;
+                        break;
                 }
                 [RNImageUtils updatePhotoMetadata:imageSampleBuffer withAdditionalData:@{ @"Orientation": @(imageRotation) } inResponse:response]; // TODO
             }
diff --git a/ios/RN/RNImageUtils.h b/ios/RN/RNImageUtils.h
index b1da64f32..f173809d8 100644
--- a/ios/RN/RNImageUtils.h
+++ b/ios/RN/RNImageUtils.h
@@ -13,6 +13,7 @@
 
 + (UIImage *)generatePhotoOfSize:(CGSize)size;
 + (UIImage *)cropImage:(UIImage *)image toRect:(CGRect)rect;
++ (UIImage *)mirrorImage:(UIImage *)image;
 + (NSString *)writeImage:(NSData *)image toPath:(NSString *)path;
 + (void)updatePhotoMetadata:(CMSampleBufferRef)imageSampleBuffer withAdditionalData:(NSDictionary *)additionalData inResponse:(NSMutableDictionary *)response;
 
diff --git a/ios/RN/RNImageUtils.m b/ios/RN/RNImageUtils.m
index 7f8767eda..e5d4966c7 100644
--- a/ios/RN/RNImageUtils.m
+++ b/ios/RN/RNImageUtils.m
@@ -38,6 +38,29 @@ + (UIImage *)cropImage:(UIImage *)image toRect:(CGRect)rect
     return image;
 }
 
++ (UIImage *)mirrorImage:(UIImage *)image
+{
+    UIImageOrientation flippedOrientation = UIImageOrientationUpMirrored;
+    switch (image.imageOrientation) {
+        case UIImageOrientationDown:
+            flippedOrientation = UIImageOrientationDownMirrored;
+            break;
+        case UIImageOrientationLeft:
+            flippedOrientation = UIImageOrientationRightMirrored;
+            break;
+        case UIImageOrientationUp:
+            flippedOrientation = UIImageOrientationUpMirrored;
+            break;
+        case UIImageOrientationRight:
+            flippedOrientation = UIImageOrientationLeftMirrored;
+            break;
+        default:
+            break;
+    }
+    UIImage * flippedImage = [UIImage imageWithCGImage:image.CGImage scale:image.scale orientation:flippedOrientation];
+    return flippedImage;
+}
+
 + (NSString *)writeImage:(NSData *)image toPath:(NSString *)path
 {
     [image writeToFile:path atomically:YES];