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      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 
     11 namespace {
     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.
     15 bool IsFeatureAllowed(content::GpuDataManager* manager,
     16                       gpu::GpuFeatureType feature) {
     17   return (manager->GpuAccessAllowed(NULL) &&
     18           !manager->IsFeatureBlacklisted(feature));
     19 }
     20 
     21 }  // namespace
     22 
     23 GPUFeatureChecker::GPUFeatureChecker(gpu::GpuFeatureType feature,
     24                                      FeatureAvailableCallback callback)
     25     : feature_(feature),
     26       callback_(callback) {
     27 }
     28 
     29 GPUFeatureChecker::~GPUFeatureChecker() {
     30 }
     31 
     32 void 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 
     62 void 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