Shape detection service: Add QR detection in Mac

services/shape_detection/face_detection_impl_mac.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/shape_detection/face_detection_impl_mac.h"
 
 #include "base/mac/scoped_cftyperef.h"
-#include "base/mac/scoped_nsobject.h"
-#include "base/memory/shared_memory.h"
 #include "media/capture/video/scoped_result_callback.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
-#include "mojo/public/cpp/system/platform_handle.h"
+#include "services/shape_detection/detection_utils_mac.h"
 #include "services/shape_detection/face_detection_provider_impl.h"
 
 namespace shape_detection {
 
 namespace {
 
-// kCIFormatRGBA8 is not exposed to public until Mac 10.11. So we define the
-// same constant to support RGBA8 format in earlier versions.
-#if !defined(MAC_OS_X_VERSION_10_11) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_11
-const int kCIFormatRGBA8 = 24;
-#endif
-
 void RunCallbackWithFaces(
     const shape_detection::mojom::FaceDetection::DetectCallback& callback,
     shape_detection::mojom::FaceDetectionResultPtr faces) {
   callback.Run(std::move(faces));
 }
 
 void RunCallbackWithNoFaces(
     const shape_detection::mojom::FaceDetection::DetectCallback& callback) {
   callback.Run(shape_detection::mojom::FaceDetectionResult::New());
 }
 
 }  // anonymous namespace
 
 void FaceDetectionProviderImpl::CreateFaceDetection(
     shape_detection::mojom::FaceDetectionRequest request,
     shape_detection::mojom::FaceDetectorOptionsPtr options) {
   mojo::MakeStrongBinding(
       base::MakeUnique<FaceDetectionImplMac>(std::move(options)),
       std::move(request));
 }
 
 FaceDetectionImplMac::FaceDetectionImplMac(
     shape_detection::mojom::FaceDetectorOptionsPtr options) {
-  context_.reset([[CIContext alloc] init]);
   NSDictionary* const opts = @{CIDetectorAccuracy : CIDetectorAccuracyHigh};
   detector_.reset([[CIDetector detectorOfType:CIDetectorTypeFace
-                                      context:context_
+                                      context:nil
                                       options:opts] retain]);
 }
 
 FaceDetectionImplMac::~FaceDetectionImplMac() {}
 
 void FaceDetectionImplMac::Detect(mojo::ScopedSharedBufferHandle frame_data,
                                   uint32_t width,
                                   uint32_t height,
                                   const DetectCallback& callback) {
   media::ScopedResultCallback<DetectCallback> scoped_callback(
       base::Bind(&RunCallbackWithFaces, callback),
       base::Bind(&RunCallbackWithNoFaces));
 
-  base::CheckedNumeric<uint32_t> num_pixels =
-      base::CheckedNumeric<uint32_t>(width) * height;
-  base::CheckedNumeric<uint32_t> num_bytes = num_pixels * 4;
-  if (!num_bytes.IsValid()) {
-    DLOG(ERROR) << "Data overflow";
+  base::scoped_nsobject<CIImage> ci_image =
+      CreateCIImageFromSharedMemory(std::move(frame_data), width, height);
+  if (!ci_image)
     return;
-  }
-
-  base::SharedMemoryHandle memory_handle;
-  size_t memory_size = 0;
-  bool read_only_flag = false;
-  const MojoResult result = mojo::UnwrapSharedMemoryHandle(
-      std::move(frame_data), &memory_handle, &memory_size, &read_only_flag);
-  DCHECK_EQ(MOJO_RESULT_OK, result) << "Failed to unwrap SharedBufferHandle";
-  if (!memory_size || memory_size != num_bytes.ValueOrDie()) {
-    DLOG(ERROR) << "Invalid image size";
-    return;
-  }
-
-  auto shared_memory =
-      base::MakeUnique<base::SharedMemory>(memory_handle, true /* read_only */);
-  if (!shared_memory->Map(memory_size)) {
-    DLOG(ERROR) << "Failed to map bytes from shared memory";
-    return;
-  }
-
-  NSData* byte_data = [NSData dataWithBytesNoCopy:shared_memory->memory()
-                                           length:num_bytes.ValueOrDie()
-                                     freeWhenDone:NO];
-
-  base::ScopedCFTypeRef<CGColorSpaceRef> colorspace(
-      CGColorSpaceCreateWithName(kCGColorSpaceSRGB));
-
-  // CIImage will return nil when RGBA8 is not supported in a certain version.
-  base::scoped_nsobject<CIImage> ci_image([[CIImage alloc]
-      initWithBitmapData:byte_data
-             bytesPerRow:width * 4
-                    size:CGSizeMake(width, height)
-                  format:kCIFormatRGBA8
-              colorSpace:colorspace]);
-  if (!ci_image) {
-    DLOG(ERROR) << "Failed to create CIImage";
-    return;
-  }
 
   NSArray* const features = [detector_ featuresInImage:ci_image];
 
   shape_detection::mojom::FaceDetectionResultPtr faces =
       shape_detection::mojom::FaceDetectionResult::New();
   for (CIFaceFeature* const f in features) {
     // In the default Core Graphics coordinate space, the origin is located
     // in the lower-left corner, and thus |ci_image| is flipped vertically.
     // We need to adjust |y| coordinate of bounding box before sending it.
     gfx::RectF boundingbox(f.bounds.origin.x,
                            height - f.bounds.origin.y - f.bounds.size.height,
                            f.bounds.size.width, f.bounds.size.height);
     faces->bounding_boxes.push_back(boundingbox);
   }
   scoped_callback.Run(std::move(faces));
 }
 
 }  // namespace shape_detection