chrome/browser/gpu/gpu_feature_checker.cc

   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 }