1// Copyright (c) 2012 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#include "chrome/browser/gpu/gpu_feature_checker.h" 6 7#include "base/logging.h" 8#include "content/public/browser/browser_thread.h" 9#include "content/public/browser/gpu_data_manager.h" 10 11namespace { 12 13// A false return value is always valid, but a true one is only valid if full 14// GPU info has been collected in a GPU process. 15bool IsFeatureAllowed(content::GpuDataManager* manager, 16 gpu::GpuFeatureType feature) { 17 return (manager->GpuAccessAllowed(NULL) && 18 !manager->IsFeatureBlacklisted(feature)); 19} 20 21} // namespace 22 23GPUFeatureChecker::GPUFeatureChecker(gpu::GpuFeatureType feature, 24 FeatureAvailableCallback callback) 25 : feature_(feature), 26 callback_(callback) { 27} 28 29GPUFeatureChecker::~GPUFeatureChecker() { 30} 31 32void GPUFeatureChecker::CheckGPUFeatureAvailability() { 33 CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)); 34 35 bool finalized = true; 36#if defined(OS_LINUX) 37 // On Windows and Mac, so far we can always make the final WebGL blacklisting 38 // decision based on partial GPU info; on Linux, we need to launch the GPU 39 // process to collect full GPU info and make the final decision. 40 finalized = false; 41#endif 42 43 content::GpuDataManager* manager = content::GpuDataManager::GetInstance(); 44 if (manager->IsEssentialGpuInfoAvailable()) 45 finalized = true; 46 47 bool feature_allowed = IsFeatureAllowed(manager, feature_); 48 if (!feature_allowed) 49 finalized = true; 50 51 if (finalized) { 52 callback_.Run(feature_allowed); 53 } else { 54 // Matched with a Release in OnGpuInfoUpdate. 55 AddRef(); 56 57 manager->AddObserver(this); 58 manager->RequestCompleteGpuInfoIfNeeded(); 59 } 60} 61 62void GPUFeatureChecker::OnGpuInfoUpdate() { 63 content::GpuDataManager* manager = content::GpuDataManager::GetInstance(); 64 manager->RemoveObserver(this); 65 bool feature_allowed = IsFeatureAllowed(manager, feature_); 66 callback_.Run(feature_allowed); 67 68 // Matches the AddRef in HasFeature(). 69 Release(); 70} 71