Added iOS face stylizer header

mediapipe/tasks/ios/vision/face_stylizer/BUILD

@@ -35,3 +35,12 @@ objc_library(
     ],
 )
 
+objc_library(
+    name = "MPPFaceStylizer",
+    hdrs = ["sources/MPPFaceStylizer.h"],
+    deps = [
+        ":MPPFaceStylizerOptions",
+        ":MPPFaceStylizerResult",
+        "//mediapipe/tasks/ios/vision/core:MPPImage",
+    ],
+)

mediapipe/tasks/ios/vision/face_stylizer/sources/MPPFaceStylizer.h

@@ -0,0 +1,111 @@
+// Copyright 2023 The MediaPipe Authors.
+//
+// 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.
+
+#import <Foundation/Foundation.h>
+
+#import "mediapipe/tasks/ios/vision/core/sources/MPPImage.h"
+#import "mediapipe/tasks/ios/vision/face_stylizer/sources/MPPFaceStylizerOptions.h"
+#import "mediapipe/tasks/ios/vision/face_stylizer/sources/MPPFaceStylizerResult.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * Class that performs face stylization on images.
+ */
+NS_SWIFT_NAME(FaceStylizer)
+@interface MPPFaceStylizer : NSObject
+
+/**
+ * Creates a new instance of `FaceStylizer` from an absolute path to a TensorFlow Lite model file
+ * stored locally on the device and the default `FaceStylizer`.
+ *
+ * @param modelPath An absolute path to a TensorFlow Lite model file stored locally on the device.
+ *
+ * @return A new instance of `FaceStylizer` with the given model path. `nil` if there is an error in
+ * initializing the face stylizer.
+ */
+- (nullable instancetype)initWithModelPath:(NSString *)modelPath error:(NSError **)error;
+
+/**
+ * Creates a new instance of `FaceStylizer` from the given `FaceStylizerOptions`.
+ *
+ * @param options The options of type `FaceStylizerOptions` to use for configuring the
+ * `FaceStylizer`.
+ *
+ * @return A new instance of `FaceStylizer` with the given options. `nil` if there is an error in
+ * initializing the face stylizer.
+ */
+- (nullable instancetype)initWithOptions:(MPPFaceStylizerOptions *)options
+                                   error:(NSError **)error NS_DESIGNATED_INITIALIZER;
+
+/**
+ * Performs face stylization on the provided `MPImage` and returns a `MPPFaceStylizerResult`
+ * containing a copy of the stylized image. This method should not be used in high-throughput
+ * applications since the returned image is copied. Rotation will be applied according to the
+ * `orientation` property of the provided `MPImage`.
+ *
+ * This method supports RGBA images. If your `MPPImage` has a source type of `.pixelBuffer` or
+ * `.sampleBuffer`, the underlying pixel buffer must have one of the following pixel format types:
+ * 1. kCVPixelFormatType_32BGRA
+ * 2. kCVPixelFormatType_32RGBA
+ *
+ * If your `MPImage` has a source type of `.image` ensure that the color space is RGB with an
+ * Alpha channel.
+ *
+ * @param image The `MPImage` on which face stylization is to be performed.
+ *
+ * @return A `FaceStylizerResult` that contains the stylized image of the most visible face. The
+ * returned image is copied. The stylized output image size is the same as the model output
+ * size. The `stylizedImage` of the `FaceStylizerResult` is `nil` if there is no face detected in
+ * the imput image. `FaceStylizerResult` is `nil` if there is an error in initializing the face
+ * stylizer.
+ */
+- (nullable MPPFaceStylizerResult *)stylizeImage:(MPPImage *)image
+                                           error:(NSError **)error NS_SWIFT_NAME(stylize(image:));
+
+/**
+ * Performs face stylization on the provided `MPImage` using the whole image as region of interest
+ * and provides zero-copied results via the given completion handler block. The lifetime of the
+ * stylized image is only guaranteed for the duration of the block. The method returns synchronously
+ * once the completion handler returns.
+ *
+ * Rotation will be applied according to the `orientation` property of the provided `MPImage`.
+ *
+ * This method supports RGBA images. If your `MPImage` has a source type of `.pixelBuffer` or
+ * `.sampleBuffer`, the underlying pixel buffer must have one of the following pixel format types:
+ * 1. kCVPixelFormatType_32BGRA
+ * 2. kCVPixelFormatType_32RGBA
+ *
+ * If your `MPImage` has a source type of `.image` ensure that the color space is RGB with an Alpha
+ * channel.
+ *
+ * @param image The `MPImage` on which face stylization is to be performed.
+ * @param completionHandler A block to be invoked with the results of performing face stylization on
+ * the imput image. The block takes two arguments, the optional `FaceStylizerResult` that contains
+ * the zero-copied stylized image if face stylization was successful and an optional error populated
+ * upon failure. The lifetime of the stylized image is only guaranteed for the duration of the
+ * block.
+ */
+- (void)stylizeImage:(MPPImage *)image
+    withCompletionHandler:(void (^)(MPPFaceStylizerResult *_Nullable result,
+                                    NSError *_Nullable error))completionHandler
+    NS_SWIFT_NAME(stylize(image:completion:));
+
+- (instancetype)init NS_UNAVAILABLE;
+
++ (instancetype)new NS_UNAVAILABLE;
+
+@end
+
+NS_ASSUME_NONNULL_END