feat: add rotation attribute to DetectImageOptions

Author: mfrey-WELL

README.md

@@ -100,8 +100,9 @@ Tries to detect text from the given image
 
 #### DetectImageOptions
 
-| Prop              | Type                | Description                    |
-| ----------------- | ------------------- | ------------------------------ |
-| **`base64Image`** | <code>string</code> | The image to detect texts from |
+| Prop              | Type                | Description                                                                                      |
+| ----------------- | ------------------- | ------------------------------------------------------------------------------------------------ |
+| **`base64Image`** | <code>string</code> | The image to detect texts from                                                                   |
+| **`rotation`**    | <code>number</code> | The image's counter-clockwise orientation degrees. Only 0, 90, 180, 270 are supported. Default 0 |
 
 </docgen-api>

android/src/main/java/com/pantrist/ml/CapacitorPluginMlKitTextRecognition.kt

@@ -22,6 +22,7 @@ class CapacitorPluginMlKitTextRecognition : Plugin() {
             call.reject("No image is given!")
             return
         }
+        val rotation = call.getInt("rotation") ?: 0
 
         val image: InputImage
         try {
@@ -31,7 +32,7 @@ class CapacitorPluginMlKitTextRecognition : Plugin() {
                 call.reject("Decoded image is null")
                 return
             }
-            image = InputImage.fromBitmap(decodedByte, 0);
+            image = InputImage.fromBitmap(decodedByte, rotation)
         } catch (e: IOException) {
             call.reject("Unable to parse image")
             return

ios/Plugin/CapacitorPluginMlKitTextRecognitionPlugin.swift

@@ -13,6 +13,7 @@ public class CapacitorPluginMlKitTextRecognitionPlugin: CAPPlugin {
             call.reject("No image is given!")
             return
         }
+        let rotation = call.getInt("rotation") ?? 0
 
         let dataDecoded : Data = Data(base64Encoded: encodedImage, options: .ignoreUnknownCharacters)!
         guard let image = UIImage(data: dataDecoded) else {
@@ -23,6 +24,7 @@ public class CapacitorPluginMlKitTextRecognitionPlugin: CAPPlugin {
         let latinOptions = TextRecognizerOptions()
         let textRecognizer = TextRecognizer.textRecognizer(options: latinOptions)
         let visionImage = VisionImage(image: image)
+        visionImage.orientation = visionImageOrientation(rotation: rotation)
 
         textRecognizer.process(visionImage) { result, error in
           guard error == nil, let result = result else {
@@ -81,4 +83,19 @@ public class CapacitorPluginMlKitTextRecognitionPlugin: CAPPlugin {
           ])
         }
     }
+
+    public func visionImageOrientation(rotation: Int) -> UIImage.Orientation {
+        switch rotation {
+        case 0:
+            return .up
+        case 90:
+            return .left
+        case 180:
+            return .down
+        case 270:
+            return .right
+        default:
+            return .up
+        }
+    }
 }

src/definitions.ts

@@ -12,6 +12,10 @@ export interface DetectImageOptions {
    * The image to detect texts from
    */
   base64Image: string;
+  /**
+   * The image's counter-clockwise orientation degrees. Only 0, 90, 180, 270 are supported. Default 0
+   */
+  rotation?: number;
 }
 
 export interface TextDetectionResult {