ShapeDetection: use mojom::Bitmap for mojo interface.

services/shape_detection/detection_utils_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/detection_utils_mac.h"
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/shared_memory.h"
 #include "mojo/public/cpp/system/platform_handle.h"
 #include "services/shape_detection/barcode_detection_impl.h"
+#include "skia/ext/skia_utils_mac.h"
+#include "third_party/skia/include/utils/mac/SkCGUtils.h"
 
 namespace shape_detection {
 
-// These formats are available but not public until Mac 10.11.
-#if !defined(MAC_OS_X_VERSION_10_11) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_11
-const int kCIFormatRGBA8 = 24;
-#else
-//static_assert(kCIFormatRGBA8 == 24, "RGBA8 format enum index.");
-#endif
-
-base::scoped_nsobject<CIImage> CreateCIImageFromSharedMemory(
-    mojo::ScopedSharedBufferHandle frame_data,
-    uint32_t width,
-    uint32_t height) {
+base::scoped_nsobject<CIImage> CreateCIImageFromData(
+    const SkBitmap& bitmap_data) {
   base::CheckedNumeric<uint32_t> num_pixels =
-      base::CheckedNumeric<uint32_t>(width) * height;
+      base::CheckedNumeric<uint32_t>(bitmap_data.width())
+        * bitmap_data.height();
   base::CheckedNumeric<uint32_t> num_bytes = num_pixels * 4;
   if (!num_bytes.IsValid()) {
     DLOG(ERROR) << "Data overflow";
     return base::scoped_nsobject<CIImage>();
   }
 
-  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";
+  base::ScopedCFTypeRef<CGColorSpaceRef> colorspace(
+      CGColorSpaceCreateWithName(kCGColorSpaceSRGB));
+
+  // First convert SkBitmap to CGImageRef.
+  base::ScopedCFTypeRef<CGImageRef> cg_image(
+      SkCreateCGImageRefWithColorspace(bitmap_data, colorspace));
+  if (!cg_image) {
+    DLOG(ERROR) << "Failed to create CGImageRef";
     return base::scoped_nsobject<CIImage>();
   }
 
-  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 base::scoped_nsobject<CIImage>();
-  }
-
-  NSData* byte_data = [NSData dataWithBytesNoCopy:shared_memory->memory()
-                                           length:num_bytes.ValueOrDie()
-                                     freeWhenDone:NO];
-
-  base::ScopedCFTypeRef<CGColorSpaceRef> colorspace(
-      CGColorSpaceCreateWithName(kCGColorSpaceSRGB));
-
   // CIImage will return nil if 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]);
+      initWithCGImage:cg_image]);
   if (!ci_image) {
     DLOG(ERROR) << "Failed to create CIImage";
     return base::scoped_nsobject<CIImage>();
   }
   return ci_image;
 }
 
 }  // namespace shape_detection