content/browser/compositor/image_transport_factory.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_IMAGE_TRANSPORT_FACTORY_H_
   6 #define CONTENT_BROWSER_COMPOSITOR_IMAGE_TRANSPORT_FACTORY_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "content/common/content_export.h"
  13 #include "ui/gfx/native_widget_types.h"
  14
  15 namespace gfx {
  16 class Size;
  17 }
  18
  19 namespace ui {
  20 class ContextFactory;
  21 class Texture;
  22 }
  23
  24 namespace blink {
  25 class WebGraphicsContext3D;
  26 }
  27
  28 namespace content {
  29 class GLHelper;
  30
  31 // This class provides a way to get notified when surface handles get lost.
  32 class CONTENT_EXPORT ImageTransportFactoryObserver {
  33  public:
  34   virtual ~ImageTransportFactoryObserver() {}
  35
  36   // Notifies that the surface handles generated by ImageTransportFactory were
  37   // lost.
  38   // When this is called, the old resources (e.g. shared context, GL helper)
  39   // still exist, but are about to be destroyed. Getting a reference to those
  40   // resources from the ImageTransportFactory (e.g. through GetGLHelper) will
  41   // return newly recreated, valid resources.
  42   virtual void OnLostResources() = 0;
  43 };
  44
  45 // This class provides the interface for creating the support for the
  46 // cross-process image transport, both for creating the shared surface handle
  47 // (destination surface for the GPU process) and the transport client (logic for
  48 // using that surface as a texture). The factory is a process-wide singleton.
  49 class CONTENT_EXPORT ImageTransportFactory {
  50  public:
  51   virtual ~ImageTransportFactory() {}
  52
  53   // Initializes the global transport factory.
  54   static void Initialize();
  55
  56   // Initializes the global transport factory for unit tests using the provided
  57   // context factory.
  58   static void InitializeForUnitTests(
  59       scoped_ptr<ui::ContextFactory> test_factory);
  60
  61   // Terminates the global transport factory.
  62   static void Terminate();
  63
  64   // Gets the factory instance.
  65   static ImageTransportFactory* GetInstance();
  66
  67   // Gets the image transport factory as a context factory for the compositor.
  68   virtual ui::ContextFactory* AsContextFactory() = 0;
  69
  70   virtual gfx::GLSurfaceHandle GetSharedSurfaceHandle() = 0;
  71
  72   // Creates a transport texture for a given scale factor.
  73   virtual scoped_refptr<ui::Texture> CreateTransportClient(
  74       float device_scale_factor) = 0;
  75
  76   // Variant of CreateTransportClient() that deletes the texture on the GPU when
  77   // the returned value is deleted.
  78   virtual scoped_refptr<ui::Texture> CreateOwnedTexture(
  79       const gfx::Size& size,
  80       float device_scale_factor,
  81       unsigned int texture_id) = 0;
  82
  83   // Gets a GLHelper instance, associated with the shared context. This
  84   // GLHelper will get destroyed whenever the shared context is lost
  85   // (ImageTransportFactoryObserver::OnLostResources is called).
  86   virtual GLHelper* GetGLHelper() = 0;
  87
  88   virtual void AddObserver(ImageTransportFactoryObserver* observer) = 0;
  89   virtual void RemoveObserver(ImageTransportFactoryObserver* observer) = 0;
  90 };
  91
  92 }  // namespace content
  93
  94 #endif  // CONTENT_BROWSER_COMPOSITOR_IMAGE_TRANSPORT_FACTORY_H_