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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_DESKTOP_CAPTURE_WIN_SCOPED_GDI_HANDLE_H_
#define MODULES_DESKTOP_CAPTURE_WIN_SCOPED_GDI_HANDLE_H_
#include <windows.h>
namespace webrtc {
namespace win {
// Scoper for GDI objects.
template <class T, class Traits>
class ScopedGDIObject {
public:
ScopedGDIObject() : handle_(NULL) {}
explicit ScopedGDIObject(T object) : handle_(object) {}
~ScopedGDIObject() { Traits::Close(handle_); }
ScopedGDIObject(const ScopedGDIObject&) = delete;
ScopedGDIObject& operator=(const ScopedGDIObject&) = delete;
T Get() { return handle_; }
void Set(T object) {
if (handle_ && object != handle_)
Traits::Close(handle_);
handle_ = object;
}
ScopedGDIObject& operator=(T object) {
Set(object);
return *this;
}
T release() {
T object = handle_;
handle_ = NULL;
return object;
}
operator T() { return handle_; }
private:
T handle_;
};
// The traits class that uses DeleteObject() to close a handle.
template <typename T>
class DeleteObjectTraits {
public:
DeleteObjectTraits() = delete;
DeleteObjectTraits(const DeleteObjectTraits&) = delete;
DeleteObjectTraits& operator=(const DeleteObjectTraits&) = delete;
// Closes the handle.
static void Close(T handle) {
if (handle)
DeleteObject(handle);
}
};
// The traits class that uses DestroyCursor() to close a handle.
class DestroyCursorTraits {
public:
DestroyCursorTraits() = delete;
DestroyCursorTraits(const DestroyCursorTraits&) = delete;
DestroyCursorTraits& operator=(const DestroyCursorTraits&) = delete;
// Closes the handle.
static void Close(HCURSOR handle) {
if (handle)
DestroyCursor(handle);
}
};
typedef ScopedGDIObject<HBITMAP, DeleteObjectTraits<HBITMAP> > ScopedBitmap;
typedef ScopedGDIObject<HCURSOR, DestroyCursorTraits> ScopedCursor;
} // namespace win
} // namespace webrtc
#endif // MODULES_DESKTOP_CAPTURE_WIN_SCOPED_GDI_HANDLE_H_
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