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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 "content/public/browser/compositor_util.h"
      6 
      7 #include "base/command_line.h"
      8 #include "base/metrics/field_trial.h"
      9 #include "content/public/browser/gpu_data_manager.h"
     10 #include "content/public/common/content_constants.h"
     11 #include "content/public/common/content_switches.h"
     12 #include "gpu/config/gpu_feature_type.h"
     13 
     14 namespace content {
     15 
     16 namespace {
     17 
     18 bool CanDoAcceleratedCompositing() {
     19   const GpuDataManager* manager = GpuDataManager::GetInstance();
     20 
     21   // Don't run the field trial if gpu access has been blocked or
     22   // accelerated compositing is blacklisted.
     23   if (!manager->GpuAccessAllowed(NULL) ||
     24       manager->IsFeatureBlacklisted(
     25           gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING))
     26     return false;
     27 
     28   // Check for SwiftShader.
     29   if (manager->ShouldUseSwiftShader())
     30     return false;
     31 
     32   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
     33   if (command_line.HasSwitch(switches::kDisableAcceleratedCompositing))
     34     return false;
     35 
     36   return true;
     37 }
     38 
     39 bool IsForceCompositingModeBlacklisted() {
     40   return GpuDataManager::GetInstance()->IsFeatureBlacklisted(
     41       gpu::GPU_FEATURE_TYPE_FORCE_COMPOSITING_MODE);
     42 }
     43 
     44 }  // namespace
     45 
     46 bool IsThreadedCompositingEnabled() {
     47 #if defined(OS_WIN) && defined(USE_AURA)
     48   // We always want compositing on Aura Windows.
     49   return true;
     50 #endif
     51 
     52   if (!CanDoAcceleratedCompositing())
     53     return false;
     54 
     55   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
     56 
     57   // Command line switches take precedence over blacklist and field trials.
     58   if (command_line.HasSwitch(switches::kDisableForceCompositingMode) ||
     59       command_line.HasSwitch(switches::kDisableThreadedCompositing))
     60     return false;
     61 
     62 #if defined(OS_CHROMEOS)
     63   // We always want threaded compositing on  ChromeOS unless it's explicitly
     64   // disabled above.
     65   return true;
     66 #endif
     67 
     68   if (command_line.HasSwitch(switches::kEnableThreadedCompositing))
     69     return true;
     70 
     71   if (IsForceCompositingModeBlacklisted())
     72     return false;
     73 
     74   base::FieldTrial* trial =
     75       base::FieldTrialList::Find(kGpuCompositingFieldTrialName);
     76   return trial &&
     77          trial->group_name() == kGpuCompositingFieldTrialThreadEnabledName;
     78 }
     79 
     80 bool IsForceCompositingModeEnabled() {
     81 #if defined(OS_WIN) && defined(USE_AURA)
     82   // We always want compositing on Aura Windows.
     83   return true;
     84 #endif
     85 
     86   if (!CanDoAcceleratedCompositing())
     87     return false;
     88 
     89   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
     90 
     91   // Command line switches take precedence over blacklisting and field trials.
     92   if (command_line.HasSwitch(switches::kDisableForceCompositingMode))
     93     return false;
     94 
     95 #if defined(OS_CHROMEOS)
     96   // We always want compositing ChromeOS unless it's explicitly disabled above.
     97   return true;
     98 #endif
     99 
    100   if (command_line.HasSwitch(switches::kForceCompositingMode))
    101     return true;
    102 
    103   if (IsForceCompositingModeBlacklisted())
    104     return false;
    105 
    106   base::FieldTrial* trial =
    107       base::FieldTrialList::Find(kGpuCompositingFieldTrialName);
    108 
    109   // Force compositing is enabled in both the force compositing
    110   // and threaded compositing mode field trials.
    111   return trial &&
    112         (trial->group_name() ==
    113             kGpuCompositingFieldTrialForceCompositingEnabledName ||
    114          trial->group_name() == kGpuCompositingFieldTrialThreadEnabledName);
    115 }
    116 
    117 }  // namespace content
    118