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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.
#include "content/browser/compositor/browser_compositor_view_mac.h"
#include <stdint.h>
#include <utility>
#include "base/lazy_instance.h"
#include "base/trace_event/trace_event.h"
#include "content/browser/compositor/image_transport_factory.h"
#include "content/public/browser/context_factory.h"
#include "ui/accelerated_widget_mac/accelerated_widget_mac.h"
#include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
////////////////////////////////////////////////////////////////////////////////
// BrowserCompositorMac
namespace content {
namespace {
// Set when no browser compositors should remain alive.
bool g_has_shut_down = false;
// The number of placeholder objects allocated. If this reaches zero, then
// the BrowserCompositorMac being held on to for recycling,
// |g_recyclable_browser_compositor|, will be freed.
uint32_t g_placeholder_count = 0;
// A spare BrowserCompositorMac kept around for recycling.
base::LazyInstance<scoped_ptr<BrowserCompositorMac>>
g_recyclable_browser_compositor;
} // namespace
BrowserCompositorMac::BrowserCompositorMac()
: accelerated_widget_mac_(new ui::AcceleratedWidgetMac()),
compositor_(content::GetContextFactory(),
ui::WindowResizeHelperMac::Get()->task_runner()) {
compositor_.SetAcceleratedWidget(
accelerated_widget_mac_->accelerated_widget());
compositor_.SetLocksWillTimeOut(false);
Suspend();
compositor_.AddObserver(this);
}
BrowserCompositorMac::~BrowserCompositorMac() {
compositor_.RemoveObserver(this);
}
void BrowserCompositorMac::Suspend() {
compositor_suspended_lock_ = compositor_.GetCompositorLock();
}
void BrowserCompositorMac::Unsuspend() {
compositor_suspended_lock_ = nullptr;
}
void BrowserCompositorMac::OnCompositingDidCommit(
ui::Compositor* compositor_that_did_commit) {
DCHECK_EQ(compositor_that_did_commit, compositor());
content::ImageTransportFactory::GetInstance()
->SetCompositorSuspendedForRecycle(compositor(), false);
}
// static
scoped_ptr<BrowserCompositorMac> BrowserCompositorMac::Create() {
DCHECK(ui::WindowResizeHelperMac::Get()->task_runner());
if (g_recyclable_browser_compositor.Get())
return std::move(g_recyclable_browser_compositor.Get());
return scoped_ptr<BrowserCompositorMac>(new BrowserCompositorMac);
}
// static
void BrowserCompositorMac::Recycle(
scoped_ptr<BrowserCompositorMac> compositor) {
DCHECK(compositor);
content::ImageTransportFactory::GetInstance()
->SetCompositorSuspendedForRecycle(compositor->compositor(), true);
// It is an error to have a browser compositor continue to exist after
// shutdown.
CHECK(!g_has_shut_down);
// Make this BrowserCompositorMac recyclable for future instances.
g_recyclable_browser_compositor.Get().swap(compositor);
// If there are no placeholders allocated, destroy the recyclable
// BrowserCompositorMac that we just populated.
if (!g_placeholder_count)
g_recyclable_browser_compositor.Get().reset();
}
// static
void BrowserCompositorMac::DisableRecyclingForShutdown() {
g_has_shut_down = true;
g_recyclable_browser_compositor.Get().reset();
}
////////////////////////////////////////////////////////////////////////////////
// BrowserCompositorMacPlaceholder
BrowserCompositorMacPlaceholder::BrowserCompositorMacPlaceholder() {
g_placeholder_count += 1;
}
BrowserCompositorMacPlaceholder::~BrowserCompositorMacPlaceholder() {
DCHECK_GT(g_placeholder_count, 0u);
g_placeholder_count -= 1;
// If there are no placeholders allocated, destroy the recyclable
// BrowserCompositorMac.
if (!g_placeholder_count)
g_recyclable_browser_compositor.Get().reset();
}
} // namespace content
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