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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GL_DCOMP_SURFACE_REGISTRY_H_
#define UI_GL_DCOMP_SURFACE_REGISTRY_H_
#include "base/containers/flat_map.h"
#include "base/no_destructor.h"
#include "base/unguessable_token.h"
#include "base/win/scoped_handle.h"
#include "ui/gl/gl_export.h"
namespace gl {
// A registry in the GPU process for mapping an `UnguessableToken` to a
// Windows Direct Composition surface handle. This class is meant to be used as
// a singleton.
class GL_EXPORT DCOMPSurfaceRegistry {
public:
static DCOMPSurfaceRegistry* GetInstance();
// Registers a surface handle and return the associated token, which will be
// sent to `MediaFoundationRendererClient` and then to `DCOMPTexture` to take
// the handle for direct composition rendering.
base::UnguessableToken RegisterDCOMPSurfaceHandle(
base::win::ScopedHandle surface);
// Unregisters the surface handle associated with `token`. Called when the
// `MediaFoundationRendererWrapper` with a registered handle is destructed.
// No-op if the handle has already been taken by `DCOMPTexture`.
void UnregisterDCOMPSurfaceHandle(const base::UnguessableToken& token);
// `DCOMPTexture` calls this to take the ownership of the DCOMP surface handle
// when it receives a token from the `MediaFoundationRendererClient` in the
// render process.
base::win::ScopedHandle TakeDCOMPSurfaceHandle(
const base::UnguessableToken& token);
private:
friend base::NoDestructor<DCOMPSurfaceRegistry>;
DCOMPSurfaceRegistry();
~DCOMPSurfaceRegistry();
base::flat_map<base::UnguessableToken, base::win::ScopedHandle>
surface_handle_map_;
};
} // namespace gl
#endif // UI_GL_DCOMP_SURFACE_REGISTRY_H_
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