Shared Raster Worker Threads

cc/base/switches.cc

 // 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 "cc/base/switches.h"
 
 #include "base/command_line.h"
+#include "base/strings/string_number_conversions.h"
 
 namespace cc {
 namespace switches {
 
 // On platforms where checkerboards are used, prefer background colors instead
 // of checkerboards.
 const char kBackgroundColorInsteadOfCheckerboard[] =
     "background-color-instead-of-checkerboard";
 
 // Disables LCD text.
@@ skipping 173 matching lines @@
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
   if (command_line.HasSwitch(cc::switches::kDisableMapImage))
     return false;
   else if (command_line.HasSwitch(cc::switches::kEnableMapImage))
     return true;
 
   return false;
 }
 
+size_t GetNumRasterThreads() {
+  const int kMinRasterThreads = 1;
+  const int kMaxRasterThreads = 64;
+  const int kDefaultNumRasterThreads = 1;
+
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  if (command_line.HasSwitch(cc::switches::kNumRasterThreads)) {
+    std::string string_value =
+        command_line.GetSwitchValueASCII(cc::switches::kNumRasterThreads);
+    int num_threads;
+    base::StringToInt(string_value, &num_threads);
+    return std::max(kMinRasterThreads,
+      std::min(num_threads, kMaxRasterThreads));
+  } else {
+    return kDefaultNumRasterThreads;
+  }
+}
+
 }  // namespace switches
 }  // namespace cc