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 }
  50
  51 BrowserCompositorMac::~BrowserCompositorMac() {}
  52
  53 // static
  54 scoped_ptr<BrowserCompositorMac> BrowserCompositorMac::Create() {
  55   if (g_recyclable_browser_compositor.Get())
  56     return g_recyclable_browser_compositor.Get().Pass();
  57   return scoped_ptr<BrowserCompositorMac>(new BrowserCompositorMac).Pass();
  58 }
  59
  60 // static
  61 void BrowserCompositorMac::Recycle(
  62     scoped_ptr<BrowserCompositorMac> compositor) {
  63   DCHECK(compositor);
  64   content::ImageTransportFactory::GetInstance()->OnCompositorRecycled(
  65       compositor->compositor());
  66
  67   // It is an error to have a browser compositor continue to exist after
  68   // shutdown.
  69   CHECK(!g_has_shut_down);
  70
  71   // Make this BrowserCompositorMac recyclable for future instances.
  72   g_recyclable_browser_compositor.Get().swap(compositor);
  73
  74   // If there are no placeholders allocated, destroy the recyclable
  75   // BrowserCompositorMac that we just populated.
  76   if (!g_placeholder_count)
  77     g_recyclable_browser_compositor.Get().reset();
  78 }
  79
  80 // static
  81 void BrowserCompositorMac::DisableRecyclingForShutdown() {
  82   g_has_shut_down = true;
  83   g_recyclable_browser_compositor.Get().reset();
  84 }
  85
  86 ////////////////////////////////////////////////////////////////////////////////
  87 // BrowserCompositorMacPlaceholder
  88
  89 BrowserCompositorMacPlaceholder::BrowserCompositorMacPlaceholder() {
  90   g_placeholder_count += 1;
  91 }
  92
  93 BrowserCompositorMacPlaceholder::~BrowserCompositorMacPlaceholder() {
  94   DCHECK_GT(g_placeholder_count, 0u);
  95   g_placeholder_count -= 1;
  96
  97   // If there are no placeholders allocated, destroy the recyclable
  98   // BrowserCompositorMac.
  99   if (!g_placeholder_count)
 100     g_recyclable_browser_compositor.Get().reset();
 101 }
 102
 103 }  // namespace content