Plugin Power Saver: Force SW rendering for peripheral plugins.

content/renderer/pepper/ppb_graphics_3d_impl.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 "content/renderer/pepper/ppb_graphics_3d_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/gpu/client/command_buffer_proxy_impl.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/web_preferences.h"
 #include "content/renderer/pepper/host_globals.h"
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
+#include "content/renderer/pepper/pepper_plugin_instance_throttler.h"
 #include "content/renderer/pepper/plugin_module.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/render_view_impl.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "ppapi/c/ppp_graphics_3d.h"
 #include "ppapi/thunk/enter.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
@@ skipping 208 matching lines @@
   if (!plugin_instance)
     return false;
 
   const WebPreferences& prefs =
       static_cast<RenderViewImpl*>(plugin_instance->GetRenderView())
           ->webkit_preferences();
   // 3D access might be disabled or blacklisted.
   if (!prefs.pepper_3d_enabled)
     return false;
 
+  // Force SW rendering for keyframe extraction to avoid pixel reads from VRAM.
+  PepperPluginInstanceThrottler* throttler = plugin_instance->throttler();
+  if (throttler && throttler->needs_representative_keyframe())
+    return false;
+
   RenderThreadImpl* render_thread = RenderThreadImpl::current();
   if (!render_thread)
     return false;
 
   channel_ = render_thread->EstablishGpuChannelSync(
       CAUSE_FOR_GPU_LAUNCH_PEPPERPLATFORMCONTEXT3DIMPL_INITIALIZE);
   if (!channel_.get())
     return false;
 
   gfx::Size surface_size;
@@ skipping 118 matching lines @@
       instance->module()->GetPluginInterface(PPP_GRAPHICS_3D_INTERFACE));
   // We have to check *again* that the instance exists, because it could have
   // been deleted during GetPluginInterface(). Even the PluginModule could be
   // deleted, but in that case, the instance should also be gone, so the
   // GetInstance check covers both cases.
   if (ppp_graphics_3d && HostGlobals::Get()->GetInstance(this_pp_instance))
     ppp_graphics_3d->Graphics3DContextLost(this_pp_instance);
 }
 
 }  // namespace content