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// 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_IMAGE_TRANSPORT_FACTORY_H_
#define CONTENT_BROWSER_COMPOSITOR_IMAGE_TRANSPORT_FACTORY_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/common/content_export.h"
#include "ui/gfx/native_widget_types.h"
namespace gfx {
class Size;
}
namespace ui {
class ContextFactory;
class Texture;
}
namespace blink {
class WebGraphicsContext3D;
}
namespace content {
class GLHelper;
// This class provides a way to get notified when surface handles get lost.
class CONTENT_EXPORT ImageTransportFactoryObserver {
public:
virtual ~ImageTransportFactoryObserver() {}
// Notifies that the surface handles generated by ImageTransportFactory were
// lost.
// When this is called, the old resources (e.g. shared context, GL helper)
// still exist, but are about to be destroyed. Getting a reference to those
// resources from the ImageTransportFactory (e.g. through GetGLHelper) will
// return newly recreated, valid resources.
virtual void OnLostResources() = 0;
};
// This class provides the interface for creating the support for the
// cross-process image transport, both for creating the shared surface handle
// (destination surface for the GPU process) and the transport client (logic for
// using that surface as a texture). The factory is a process-wide singleton.
class CONTENT_EXPORT ImageTransportFactory {
public:
virtual ~ImageTransportFactory() {}
// Initializes the global transport factory.
static void Initialize();
// Initializes the global transport factory for unit tests using the provided
// context factory.
static void InitializeForUnitTests(
scoped_ptr<ui::ContextFactory> test_factory);
// Terminates the global transport factory.
static void Terminate();
// Gets the factory instance.
static ImageTransportFactory* GetInstance();
// Gets the image transport factory as a context factory for the compositor.
virtual ui::ContextFactory* AsContextFactory() = 0;
virtual gfx::GLSurfaceHandle GetSharedSurfaceHandle() = 0;
// Creates a transport texture for a given scale factor.
virtual scoped_refptr<ui::Texture> CreateTransportClient(
float device_scale_factor) = 0;
// Variant of CreateTransportClient() that deletes the texture on the GPU when
// the returned value is deleted.
virtual scoped_refptr<ui::Texture> CreateOwnedTexture(
const gfx::Size& size,
float device_scale_factor,
unsigned int texture_id) = 0;
// Gets a GLHelper instance, associated with the shared context. This
// GLHelper will get destroyed whenever the shared context is lost
// (ImageTransportFactoryObserver::OnLostResources is called).
virtual GLHelper* GetGLHelper() = 0;
virtual void AddObserver(ImageTransportFactoryObserver* observer) = 0;
virtual void RemoveObserver(ImageTransportFactoryObserver* observer) = 0;
};
} // namespace content
#endif // CONTENT_BROWSER_COMPOSITOR_IMAGE_TRANSPORT_FACTORY_H_
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