content/browser/compositor/browser_compositor_view_mac.mm

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/compositor/browser_compositor_view_mac.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/trace_event/trace_event.h"
   9 #include "content/browser/compositor/image_transport_factory.h"
  10 #include "content/browser/gpu/gpu_data_manager_impl.h"
  11 #include "content/browser/renderer_host/render_widget_resize_helper.h"
  12 #include "content/public/browser/context_factory.h"
  13 #include "gpu/config/gpu_driver_bug_workaround_type.h"
  14 #include "ui/accelerated_widget_mac/accelerated_widget_mac.h"
  15
  16 ////////////////////////////////////////////////////////////////////////////////
  17 // BrowserCompositorMac
  18
  19 namespace content {
  20
  21 namespace {
  22
  23 // Set when no browser compositors should remain alive.
  24 bool g_has_shut_down = false;
  25
  26 // The number of placeholder objects allocated. If this reaches zero, then
  27 // the BrowserCompositorMac being held on to for recycling,
  28 // |g_recyclable_browser_compositor|, will be freed.
  29 uint32 g_placeholder_count = 0;
  30
  31 // A spare BrowserCompositorMac kept around for recycling.
  32 base::LazyInstance<scoped_ptr<BrowserCompositorMac>>
  33   g_recyclable_browser_compositor;
  34
  35 bool WidgetNeedsGLFinishWorkaround() {
  36   return GpuDataManagerImpl::GetInstance()->IsDriverBugWorkaroundActive(
  37       gpu::FORCE_GL_FINISH_AFTER_COMPOSITING);
  38 }
  39
  40 }  // namespace
  41
  42 BrowserCompositorMac::BrowserCompositorMac()
  43     : accelerated_widget_mac_(
  44           new ui::AcceleratedWidgetMac(WidgetNeedsGLFinishWorkaround())),
  45       compositor_(
  46           accelerated_widget_mac_->accelerated_widget(),
  47           content::GetContextFactory(),
  48           RenderWidgetResizeHelper::Get()->task_runner()) {
  49   compositor_.SetLocksWillTimeOut(false);
  50   Suspend();
  51   compositor_.AddObserver(this);
  52 }
  53
  54 BrowserCompositorMac::~BrowserCompositorMac() {
  55   compositor_.RemoveObserver(this);
  56 }
  57
  58 void BrowserCompositorMac::Suspend() {
  59   compositor_suspended_lock_ = compositor_.GetCompositorLock();
  60 }
  61
  62 void BrowserCompositorMac::Unsuspend() {
  63   compositor_suspended_lock_ = nullptr;
  64 }
  65
  66 void BrowserCompositorMac::OnCompositingDidCommit(
  67     ui::Compositor* compositor_that_did_commit) {
  68   DCHECK_EQ(compositor_that_did_commit, compositor());
  69   content::ImageTransportFactory::GetInstance()
  70       ->SetCompositorSuspendedForRecycle(compositor(), false);
  71 }
  72
  73 // static
  74 scoped_ptr<BrowserCompositorMac> BrowserCompositorMac::Create() {
  75   if (g_recyclable_browser_compositor.Get())
  76     return g_recyclable_browser_compositor.Get().Pass();
  77   return scoped_ptr<BrowserCompositorMac>(new BrowserCompositorMac).Pass();
  78 }
  79
  80 // static
  81 void BrowserCompositorMac::Recycle(
  82     scoped_ptr<BrowserCompositorMac> compositor) {
  83   DCHECK(compositor);
  84   content::ImageTransportFactory::GetInstance()
  85       ->SetCompositorSuspendedForRecycle(compositor->compositor(), true);
  86
  87   // It is an error to have a browser compositor continue to exist after
  88   // shutdown.
  89   CHECK(!g_has_shut_down);
  90
  91   // Make this BrowserCompositorMac recyclable for future instances.
  92   g_recyclable_browser_compositor.Get().swap(compositor);
  93
  94   // If there are no placeholders allocated, destroy the recyclable
  95   // BrowserCompositorMac that we just populated.
  96   if (!g_placeholder_count)
  97     g_recyclable_browser_compositor.Get().reset();
  98 }
  99
 100 // static
 101 void BrowserCompositorMac::DisableRecyclingForShutdown() {
 102   g_has_shut_down = true;
 103   g_recyclable_browser_compositor.Get().reset();
 104 }
 105
 106 ////////////////////////////////////////////////////////////////////////////////
 107 // BrowserCompositorMacPlaceholder
 108
 109 BrowserCompositorMacPlaceholder::BrowserCompositorMacPlaceholder() {
 110   g_placeholder_count += 1;
 111 }
 112
 113 BrowserCompositorMacPlaceholder::~BrowserCompositorMacPlaceholder() {
 114   DCHECK_GT(g_placeholder_count, 0u);
 115   g_placeholder_count -= 1;
 116
 117   // If there are no placeholders allocated, destroy the recyclable
 118   // BrowserCompositorMac.
 119   if (!g_placeholder_count)
 120     g_recyclable_browser_compositor.Get().reset();
 121 }
 122
 123 }  // namespace content