services/shape_detection/detection_utils_win.h

// 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.

#ifndef SERVICES_SHAPE_DETECTION_DETECTION_UTILS_WIN_H_
#define SERVICES_SHAPE_DETECTION_DETECTION_UTILS_WIN_H_

#include <windows.storage.streams.h>
#include <wrl/client.h>
#include <wrl/event.h>

#include "base/callback.h"
#include "base/macros.h"

class SkBitmap;

namespace shape_detection {

namespace WRL = Microsoft::WRL;

using ABI::Windows::Foundation::IAsyncOperation;
using ABI::Windows::Graphics::Imaging::ISoftwareBitmapStatics;
using ABI::Windows::Graphics::Imaging::ISoftwareBitmap;
using ABI::Windows::Graphics::Imaging::BitmapPixelFormat;

// This template represents an asynchronous operation which returns a result
// upon completion, |callback_| will not be run if its object has been already
// destroyed.
template <typename RuntimeType>
class AsyncOperation {
 public:
  using IAsyncOperationPtr = WRL::ComPtr<IAsyncOperation<RuntimeType*>>;
  // A callback run when the asynchronous operation completes. The callback is
  // run with the IAsyncOperation that completed on success, or with an empty
  // pointer in case of failure.
  using Callback = base::OnceCallback<void(IAsyncOperationPtr)>;

  ~AsyncOperation() = default;

  // Creates an AsyncOperation instance which sets |callback| to be called when
  // the asynchronous action completes.
  static HRESULT BeginAsyncOperation(Callback callback,
                                     IAsyncOperationPtr async_op_ptr);

 private:
  AsyncOperation(Callback callback, IAsyncOperationPtr async_op_ptr)
      : async_op_ptr_(std::move(async_op_ptr)),
        callback_(std::move(callback)) {}

  void AsyncCallbackInternal(IAsyncOperation<RuntimeType*>* async_op,
                             AsyncStatus status);

  IAsyncOperationPtr async_op_ptr_;
  Callback callback_;

  DISALLOW_COPY_AND_ASSIGN(AsyncOperation);
};

// Creates a Windows ISoftwareBitmap from a kN32_SkColorType |bitmap|, or
// returns nullptr.
WRL::ComPtr<ISoftwareBitmap> CreateWinBitmapFromSkBitmap(
    const SkBitmap& bitmap,
    ISoftwareBitmapStatics* bitmap_factory);

// Creates a Gray8/Nv12 ISoftwareBitmap from a kN32_SkColorType |bitmap|, or
// returns nullptr.
WRL::ComPtr<ISoftwareBitmap> CreateWinBitmapWithPixelFormat(
    const SkBitmap& bitmap,
    ISoftwareBitmapStatics* bitmap_factory,
    BitmapPixelFormat pixel_format);

}  // namespace shape_detection

#endif  // SERVICES_SHAPE_DETECTION_DETECTION_UTILS_WIN_H_