BrowserCompositorMac, ResizeLock, DelegatedFrameHost => content/browser/renderer_host

content/browser/compositor/browser_compositor_view_mac.mm

-// 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