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// Copyright 2016 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GPU_SHARED_GPU_CONTEXT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GPU_SHARED_GPU_CONTEXT_H_
#include <memory>
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "third_party/blink/renderer/platform/graphics/web_graphics_context_3d_provider_wrapper.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/thread_specific.h"
namespace blink {
class WebGraphicsContext3DProvider;
// SharedGpuContext provides access to a thread-specific GPU context
// that is shared by many callsites throughout the thread.
// When on the main thread, provides access to the same context as
// Platform::CreateSharedOffscreenGraphicsContext3DProvider, and the
// same query as Platform::IsGPUCompositingEnabled().
class PLATFORM_EXPORT SharedGpuContext {
public:
// Thread-safe query if gpu compositing is enabled. This should be done before
// calling ContextProviderWrapper() if the context will be used to make
// resources meant for the compositor. When it is false, no context will be
// needed and software-based resources should be given to the compositor
// instead.
static bool IsGpuCompositingEnabled();
// May re-create context if context was lost
static base::WeakPtr<WebGraphicsContext3DProviderWrapper>
ContextProviderWrapper();
static bool AllowSoftwareToAcceleratedCanvasUpgrade();
static bool IsValidWithoutRestoring();
using ContextProviderFactory =
base::RepeatingCallback<std::unique_ptr<WebGraphicsContext3DProvider>(
bool* is_gpu_compositing_disabled)>;
static void SetContextProviderFactoryForTesting(ContextProviderFactory);
// Resets the global instance including the |context_provider_factory_| and
// dropping the context. Should be called at the end of a test that uses this
// to not interfere with the next test.
static void ResetForTesting();
private:
friend class WTF::ThreadSpecific<SharedGpuContext>;
static SharedGpuContext* GetInstanceForCurrentThread();
SharedGpuContext();
void CreateContextProviderIfNeeded(bool only_if_gpu_compositing);
// Can be overridden for tests.
ContextProviderFactory context_provider_factory_;
// This is sticky once true, we never need to ask again.
bool is_gpu_compositing_disabled_ = false;
std::unique_ptr<WebGraphicsContext3DProviderWrapper>
context_provider_wrapper_;
};
} // blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GPU_SHARED_GPU_CONTEXT_H_
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