blob: 3222bfd78a49b8662e9b70f1c3fc7cf14e94e26b [file] [log] [blame]
// 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 "base/atomicops.h"
#include "base/macros.h"
#include "mojo/public/cpp/system/buffer.h"
namespace gfx {
class Point;
namespace aura {
// Manages a shared memory buffer that stores the mouse location. It is
// expected Env calls SetMouseLocation() any time the location of the mouse
// changes.
class MouseLocationManager {
// Sets the current mouse location to |point|. Atomically writes the location
// to shared memory. |point| should be in screen-coord and DIP.
void SetMouseLocation(const gfx::Point& point_in_dip);
// Returns a read-only handle to the shared memory which contains the global
// mouse position. Each call returns a new handle.
mojo::ScopedSharedBufferHandle GetMouseLocationMemory();
base::subtle::Atomic32* mouse_location_memory() {
return reinterpret_cast<base::subtle::Atomic32*>(
// The current location of the mouse. This is always kept up to date so we
// can atomically write this to |mouse_location_memory()| once it is created.
base::subtle::Atomic32 current_mouse_location_ = 0;
// A handle to a shared memory buffer that is one 32 bit integer long. We
// share this with any client as the same user. This buffer is lazily
// created on the first access.
mojo::ScopedSharedBufferHandle mouse_location_handle_;
// The one int32 in |mouse_location_handle_|. When we write to this
// location, we must always write to it atomically. (On the other side of the
// mojo connection, this data must be read atomically.)
mojo::ScopedSharedBufferMapping mouse_location_mapping_;
} // namespace aura