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_mac.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           content::GetContextFactory(),
  47           RenderWidgetResizeHelper::Get()->task_runner()) {
  48   compositor_.SetAcceleratedWidgetAndStartCompositor(
  49       accelerated_widget_mac_->accelerated_widget());
  50   compositor_.SetLocksWillTimeOut(false);
  51   Suspend();
  52   compositor_.AddObserver(this);
  53 }
  54
  55 BrowserCompositorMac::~BrowserCompositorMac() {
  56   compositor_.RemoveObserver(this);
  57 }
  58
  59 void BrowserCompositorMac::Suspend() {
  60   compositor_suspended_lock_ = compositor_.GetCompositorLock();
  61 }
  62
  63 void BrowserCompositorMac::Unsuspend() {
  64   compositor_suspended_lock_ = nullptr;
  65 }
  66
  67 void BrowserCompositorMac::OnCompositingDidCommit(
  68     ui::Compositor* compositor_that_did_commit) {
  69   DCHECK_EQ(compositor_that_did_commit, compositor());
  70   content::ImageTransportFactory::GetInstance()
  71       ->SetCompositorSuspendedForRecycle(compositor(), false);
  72 }
  73
  74 // static
  75 scoped_ptr<BrowserCompositorMac> BrowserCompositorMac::Create() {
  76   if (g_recyclable_browser_compositor.Get())
  77     return g_recyclable_browser_compositor.Get().Pass();
  78   return scoped_ptr<BrowserCompositorMac>(new BrowserCompositorMac).Pass();
  79 }
  80
  81 // static
  82 void BrowserCompositorMac::Recycle(
  83     scoped_ptr<BrowserCompositorMac> compositor) {
  84   DCHECK(compositor);
  85   content::ImageTransportFactory::GetInstance()
  86       ->SetCompositorSuspendedForRecycle(compositor->compositor(), true);
  87
  88   // It is an error to have a browser compositor continue to exist after
  89   // shutdown.
  90   CHECK(!g_has_shut_down);
  91
  92   // Make this BrowserCompositorMac recyclable for future instances.
  93   g_recyclable_browser_compositor.Get().swap(compositor);
  94
  95   // If there are no placeholders allocated, destroy the recyclable
  96   // BrowserCompositorMac that we just populated.
  97   if (!g_placeholder_count)
  98     g_recyclable_browser_compositor.Get().reset();
  99 }
 100
 101 // static
 102 void BrowserCompositorMac::DisableRecyclingForShutdown() {
 103   g_has_shut_down = true;
 104   g_recyclable_browser_compositor.Get().reset();
 105 }
 106
 107 ////////////////////////////////////////////////////////////////////////////////
 108 // BrowserCompositorMacPlaceholder
 109
 110 BrowserCompositorMacPlaceholder::BrowserCompositorMacPlaceholder() {
 111   g_placeholder_count += 1;
 112 }
 113
 114 BrowserCompositorMacPlaceholder::~BrowserCompositorMacPlaceholder() {
 115   DCHECK_GT(g_placeholder_count, 0u);
 116   g_placeholder_count -= 1;
 117
 118   // If there are no placeholders allocated, destroy the recyclable
 119   // BrowserCompositorMac.
 120   if (!g_placeholder_count)
 121     g_recyclable_browser_compositor.Get().reset();
 122 }
 123
 124 }  // namespace content