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