content/browser/compositor/browser_compositor_view_mac.h

   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 #ifndef CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_
   6 #define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_
   7
   8 #include "ui/accelerated_widget_mac/accelerated_widget_mac.h"
   9 #include "ui/compositor/compositor.h"
  10 #include "ui/compositor/compositor_observer.h"
  11
  12 namespace content {
  13
  14 // A ui::Compositor and a gfx::AcceleratedWidget (and helper) that it draws
  15 // into. This structure is used to efficiently recycle these structures across
  16 // tabs (because creating a new ui::Compositor for each tab would be expensive
  17 // in terms of time and resources).
  18 class BrowserCompositorMac : public ui::CompositorObserver {
  19  public:
  20   virtual ~BrowserCompositorMac();
  21
  22   // Create a compositor, or recycle a preexisting one.
  23   static scoped_ptr<BrowserCompositorMac> Create();
  24
  25   // Delete a compositor, or allow it to be recycled.
  26   static void Recycle(scoped_ptr<BrowserCompositorMac> compositor);
  27
  28   // Indicate that the recyclable compositor should be destroyed, and no future
  29   // compositors should be recycled.
  30   static void DisableRecyclingForShutdown();
  31
  32   ui::Compositor* compositor() { return &compositor_; }
  33   ui::AcceleratedWidgetMac* accelerated_widget_mac() {
  34     return accelerated_widget_mac_.get();
  35   }
  36
  37   // Suspend will prevent the compositor from producing new frames. This should
  38   // be called to avoid creating spurious frames while changing state.
  39   // Compositors are created as suspended.
  40   void Suspend();
  41   void Unsuspend();
  42
  43  private:
  44   BrowserCompositorMac();
  45
  46   // ui::CompositorObserver implementation:
  47   void OnCompositingDidCommit(ui::Compositor* compositor) override;
  48   void OnCompositingStarted(ui::Compositor* compositor,
  49                             base::TimeTicks start_time) override {}
  50   void OnCompositingEnded(ui::Compositor* compositor) override {}
  51   void OnCompositingAborted(ui::Compositor* compositor) override {}
  52   void OnCompositingLockStateChanged(ui::Compositor* compositor) override {}
  53   void OnCompositingShuttingDown(ui::Compositor* compositor) override {}
  54
  55   scoped_ptr<ui::AcceleratedWidgetMac> accelerated_widget_mac_;
  56   ui::Compositor compositor_;
  57   scoped_refptr<ui::CompositorLock> compositor_suspended_lock_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(BrowserCompositorMac);
  60 };
  61
  62 // A class to keep around whenever a BrowserCompositorMac may be created.
  63 // While at least one instance of this class exists, a spare
  64 // BrowserCompositorViewCocoa will be kept around to be recycled so that the
  65 // next BrowserCompositorMac to be created will be be created quickly.
  66 class BrowserCompositorMacPlaceholder {
  67  public:
  68   BrowserCompositorMacPlaceholder();
  69   ~BrowserCompositorMacPlaceholder();
  70
  71  private:
  72   DISALLOW_COPY_AND_ASSIGN(BrowserCompositorMacPlaceholder);
  73 };
  74
  75 }  // namespace content
  76
  77 #endif  // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_