Mac ÜC: Make resize smooth

content/browser/compositor/browser_compositor_view_mac.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_
 #define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <IOSurface/IOSurfaceAPI.h>
 #include <vector>
@@ skipping 34 matching lines @@
   // renderer (if any).
   virtual void BrowserCompositorViewFrameSwapped(
       const std::vector<ui::LatencyInfo>& latency_info) = 0;
 
   // Used to install the ui::Compositor-backed NSView as a child of its parent
   // view.
   virtual NSView* BrowserCompositorSuperview() = 0;
 
   // Used to install the root ui::Layer into the ui::Compositor.
   virtual ui::Layer* BrowserCompositorRootLayer() = 0;
+
+  // If this returns true, then frames will be drawn immediately when they are
+  // received, instead of waiting for the CAOpenGLLayer's callback. This helps
+  // de-jank resize, because said callback can't come through while pumping for
+  // resized frames.
+  virtual bool BrowserCompositorShouldDrawImmediately() = 0;
 };
 
 // The class to hold a ui::Compositor-backed NSView. Because a ui::Compositor
 // is expensive in terms of resources and re-allocating a ui::Compositor is
 // expensive in terms of work, this class is largely used to manage recycled
 // instances of BrowserCompositorViewCocoa, which actually is a NSView and
 // has a ui::Compositor instance.
 class BrowserCompositorViewMac {
  public:
   // This will install the NSView which is drawn by the ui::Compositor into
   // the NSView provided by the client.
   explicit BrowserCompositorViewMac(BrowserCompositorViewMacClient* client);
   ~BrowserCompositorViewMac();
 
+  // The NSView set at the sub-view for this view.
+  NSView* GetView() const;
+
   // The ui::Compositor being used to render the NSView.
   ui::Compositor* GetCompositor() const;
 
+  // Check if a frame of the correct size is currently being displayed.
+  bool HasFrameWithSizeInDIP(const gfx::Size& desired_size_in_dip) const;
+
   // The client (used by the BrowserCompositorViewCocoa to access the client).
   BrowserCompositorViewMacClient* GetClient() const { return client_; }
 
  private:
   BrowserCompositorViewMacClient* client_;
   base::scoped_nsobject<BrowserCompositorViewCocoa> cocoa_view_;
 };
 
 // A class to keep around whenever a BrowserCompositorViewMac may be created.
 // While at least one instance of this class exists, a spare
 // BrowserCompositorViewCocoa will be kept around to be recycled so that the
 // next BrowserCompositorViewMac to be created will be be created quickly.
 class BrowserCompositorViewPlaceholderMac {
  public:
   BrowserCompositorViewPlaceholderMac();
   ~BrowserCompositorViewPlaceholderMac();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_MAC_H_