| // Copyright 2017 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_PUBLIC_BROWSER_GPU_FEATURE_CHECKER_H_ |
| #define CONTENT_PUBLIC_BROWSER_GPU_FEATURE_CHECKER_H_ |
| |
| #include "base/callback_forward.h" |
| #include "base/memory/ref_counted.h" |
| #include "content/common/content_export.h" |
| #include "gpu/config/gpu_feature_type.h" |
| |
| namespace content { |
| |
| // GpuFeatureChecker does an asynchronous lookup for a GpuFeatureType. It will |
| // keep itself alive (via being a refcounted object) until it calls the given |
| // |callback|. The feature check is not initiated (and a self-reference is not |
| // taken) until CheckGpuFeatureAvailability() is called. If the feature is |
| // already available, the |callback| may be called synchronously inside of the |
| // CheckGpuFeatureAvailability() call. |
| class GpuFeatureChecker : public base::RefCountedThreadSafe<GpuFeatureChecker> { |
| public: |
| using FeatureAvailableCallback = |
| base::OnceCallback<void(bool feature_available)>; |
| |
| CONTENT_EXPORT static scoped_refptr<GpuFeatureChecker> Create( |
| gpu::GpuFeatureType feature, |
| FeatureAvailableCallback callback); |
| |
| // Checks to see if |feature_| is available on the current GPU. |callback_| |
| // will be called to indicate the availability of the feature. It may be |
| // called synchronously if the data is already available, or else will be |
| // called asynchronously when it becomes available. This method must be called |
| // from the the UI thread. |
| // CheckGpuFeatureAvailability() may be called at most once for any given |
| // GpuFeatureChecker |
| virtual void CheckGpuFeatureAvailability() = 0; |
| |
| protected: |
| friend class base::RefCountedThreadSafe<GpuFeatureChecker>; |
| |
| virtual ~GpuFeatureChecker(); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_PUBLIC_BROWSER_GPU_FEATURE_CHECKER_H_ |