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// Copyright 2014 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 CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_
#define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_
#include "ui/accelerated_widget_mac/accelerated_widget_mac.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/compositor_observer.h"
namespace content {
// A ui::Compositor and a gfx::AcceleratedWidget (and helper) that it draws
// into. This structure is used to efficiently recycle these structures across
// tabs (because creating a new ui::Compositor for each tab would be expensive
// in terms of time and resources).
class BrowserCompositorMac : public ui::CompositorObserver {
public:
virtual ~BrowserCompositorMac();
// Create a compositor, or recycle a preexisting one.
static scoped_ptr<BrowserCompositorMac> Create();
// Delete a compositor, or allow it to be recycled.
static void Recycle(scoped_ptr<BrowserCompositorMac> compositor);
// Indicate that the recyclable compositor should be destroyed, and no future
// compositors should be recycled.
static void DisableRecyclingForShutdown();
ui::Compositor* compositor() { return &compositor_; }
ui::AcceleratedWidgetMac* accelerated_widget_mac() {
return accelerated_widget_mac_.get();
}
// Suspend will prevent the compositor from producing new frames. This should
// be called to avoid creating spurious frames while changing state.
// Compositors are created as suspended.
void Suspend();
void Unsuspend();
private:
BrowserCompositorMac();
// ui::CompositorObserver implementation:
void OnCompositingDidCommit(ui::Compositor* compositor) override;
void OnCompositingStarted(ui::Compositor* compositor,
base::TimeTicks start_time) override {}
void OnCompositingEnded(ui::Compositor* compositor) override {}
void OnCompositingAborted(ui::Compositor* compositor) override {}
void OnCompositingLockStateChanged(ui::Compositor* compositor) override {}
void OnCompositingShuttingDown(ui::Compositor* compositor) override {}
scoped_ptr<ui::AcceleratedWidgetMac> accelerated_widget_mac_;
ui::Compositor compositor_;
scoped_refptr<ui::CompositorLock> compositor_suspended_lock_;
DISALLOW_COPY_AND_ASSIGN(BrowserCompositorMac);
};
// A class to keep around whenever a BrowserCompositorMac may be created.
// While at least one instance of this class exists, a spare
// BrowserCompositorViewCocoa will be kept around to be recycled so that the
// next BrowserCompositorMac to be created will be be created quickly.
class BrowserCompositorMacPlaceholder {
public:
BrowserCompositorMacPlaceholder();
~BrowserCompositorMacPlaceholder();
private:
DISALLOW_COPY_AND_ASSIGN(BrowserCompositorMacPlaceholder);
};
} // namespace content
#endif // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_
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