1 files changed, 117 insertions, 0 deletions
diff --git a/chromium/content/browser/gpu/compositor_util.cc b/chromium/content/browser/gpu/compositor_util.cc
new file mode 100644
index 00000000000..a0cf1e21a2b
--- /dev/null
+++ b/chromium/content/browser/gpu/compositor_util.cc
@@ -0,0 +1,117 @@
+// Copyright (c) 2012 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.
+
+#include "content/public/browser/compositor_util.h"
+
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "content/public/browser/gpu_data_manager.h"
+#include "content/public/common/content_constants.h"
+#include "content/public/common/content_switches.h"
+#include "gpu/config/gpu_feature_type.h"
+
+namespace content {
+
+namespace {
+
+bool CanDoAcceleratedCompositing() {
+  const GpuDataManager* manager = GpuDataManager::GetInstance();
+
+  // Don't run the field trial if gpu access has been blocked or
+  // accelerated compositing is blacklisted.
+  if (!manager->GpuAccessAllowed(NULL) ||
+      manager->IsFeatureBlacklisted(
+          gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING))
+    return false;
+
+  // Check for SwiftShader.
+  if (manager->ShouldUseSwiftShader())
+    return false;
+
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  if (command_line.HasSwitch(switches::kDisableAcceleratedCompositing))
+    return false;
+
+  return true;
+}
+
+bool IsForceCompositingModeBlacklisted() {
+  return GpuDataManager::GetInstance()->IsFeatureBlacklisted(
+      gpu::GPU_FEATURE_TYPE_FORCE_COMPOSITING_MODE);
+}
+
+}  // namespace
+
+bool IsThreadedCompositingEnabled() {
+#if defined(OS_WIN) && defined(USE_AURA)
+  // We always want compositing on Aura Windows.
+  return true;
+#endif
+
+  if (!CanDoAcceleratedCompositing())
+    return false;
+
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+
+  // Command line switches take precedence over blacklist and field trials.
+  if (command_line.HasSwitch(switches::kDisableForceCompositingMode) ||
+      command_line.HasSwitch(switches::kDisableThreadedCompositing))
+    return false;
+
+#if defined(OS_CHROMEOS)
+  // We always want threaded compositing on  ChromeOS unless it's explicitly
+  // disabled above.
+  return true;
+#endif
+
+  if (command_line.HasSwitch(switches::kEnableThreadedCompositing))
+    return true;
+
+  if (IsForceCompositingModeBlacklisted())
+    return false;
+
+  base::FieldTrial* trial =
+      base::FieldTrialList::Find(kGpuCompositingFieldTrialName);
+  return trial &&
+         trial->group_name() == kGpuCompositingFieldTrialThreadEnabledName;
+}
+
+bool IsForceCompositingModeEnabled() {
+#if defined(OS_WIN) && defined(USE_AURA)
+  // We always want compositing on Aura Windows.
+  return true;
+#endif
+
+  if (!CanDoAcceleratedCompositing())
+    return false;
+
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+
+  // Command line switches take precedence over blacklisting and field trials.
+  if (command_line.HasSwitch(switches::kDisableForceCompositingMode))
+    return false;
+
+#if defined(OS_CHROMEOS)
+  // We always want compositing ChromeOS unless it's explicitly disabled above.
+  return true;
+#endif
+
+  if (command_line.HasSwitch(switches::kForceCompositingMode))
+    return true;
+
+  if (IsForceCompositingModeBlacklisted())
+    return false;
+
+  base::FieldTrial* trial =
+      base::FieldTrialList::Find(kGpuCompositingFieldTrialName);
+
+  // Force compositing is enabled in both the force compositing
+  // and threaded compositing mode field trials.
+  return trial &&
+        (trial->group_name() ==
+            kGpuCompositingFieldTrialForceCompositingEnabledName ||
+         trial->group_name() == kGpuCompositingFieldTrialThreadEnabledName);
+}
+
+}  // namespace content