Plugin Power Saver: Force SW rendering for peripheral plugins.

content/renderer/pepper/resource_creation_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/resource_creation_impl.h"
 
+#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
+#include "content/renderer/pepper/pepper_plugin_instance_throttler.h"
 #include "content/renderer/pepper/ppb_audio_impl.h"
 #include "content/renderer/pepper/ppb_broker_impl.h"
 #include "content/renderer/pepper/ppb_buffer_impl.h"
 #include "content/renderer/pepper/ppb_flash_message_loop_impl.h"
 #include "content/renderer/pepper/ppb_graphics_3d_impl.h"
 #include "content/renderer/pepper/ppb_image_data_impl.h"
 #include "content/renderer/pepper/ppb_scrollbar_impl.h"
 #include "content/renderer/pepper/ppb_video_decoder_impl.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_size.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/shared_impl/ppb_audio_config_shared.h"
 #include "ppapi/shared_impl/ppb_audio_shared.h"
 #include "ppapi/shared_impl/ppb_image_data_shared.h"
 #include "ppapi/shared_impl/ppb_input_event_shared.h"
 #include "ppapi/shared_impl/var.h"
 
 #if defined(OS_WIN)
 #include "base/command_line.h"
 #include "base/win/windows_version.h"
 #include "content/public/common/content_switches.h"
 #endif
 
 using ppapi::InputEventData;
 using ppapi::PPB_InputEvent_Shared;
 using ppapi::StringVar;
 
 namespace content {
 
-ResourceCreationImpl::ResourceCreationImpl(PepperPluginInstanceImpl* instance) {
+ResourceCreationImpl::ResourceCreationImpl(PepperPluginInstanceImpl* instance)
+    : instance_(instance) {
 }
 
 ResourceCreationImpl::~ResourceCreationImpl() {}
 
 PP_Resource ResourceCreationImpl::CreateAudio1_0(
     PP_Instance instance,
     PP_Resource config_id,
     PPB_Audio_Callback_1_0 audio_callback,
     void* user_data) {
   return 0;  // Not supported in-process.
@@ skipping 52 matching lines @@
   return 0;  // Not supported in-process.
 }
 
 PP_Resource ResourceCreationImpl::CreateFlashMessageLoop(PP_Instance instance) {
   return PPB_Flash_MessageLoop_Impl::Create(instance);
 }
 
 PP_Resource ResourceCreationImpl::CreateGraphics3D(PP_Instance instance,
                                                    PP_Resource share_context,
                                                    const int32_t* attrib_list) {
+  // Force SW rendering for keyframe extraction to avoid pixel reads from VRAM.

[groby-ooo-7-16, 2014/11/14 22:45:39]

I'm curious: ResourceCreationImpl has essentially no logic whatsoever - should
this live on PPB_Graphics3D_Impl::Create ?

[piman, 2014/11/14 22:53:00]

Yes, this logic should go to PPB_Graphics3D_Impl::InitRaw (so that it applies to
both in-process and out-of-process pepper). Note some existing logic there wrt
blacklisting.

[tommycli, 2014/11/14 23:58:21]

Done.

[tommycli, 2014/11/14 23:58:21]

Done.

+  if (instance_->throttler() && instance_->throttler()->needs_snapshot())
+    return 0;
+
   return PPB_Graphics3D_Impl::Create(instance, share_context, attrib_list);
 }
 
 PP_Resource ResourceCreationImpl::CreateGraphics3DRaw(
     PP_Instance instance,
     PP_Resource share_context,
     const int32_t* attrib_list,
     gpu::Capabilities* capabilities,
     base::SharedMemoryHandle* shared_state) {
+  // Force SW rendering for keyframe extraction to avoid pixel reads from VRAM.
+  if (instance_->throttler() && instance_->throttler()->needs_snapshot())
+    return 0;
+
   return PPB_Graphics3D_Impl::CreateRaw(instance, share_context, attrib_list,
                                         capabilities, shared_state);
 }
 
 PP_Resource ResourceCreationImpl::CreateHostResolver(PP_Instance instance) {
   return 0;  // Not supported in-process.
 }
 
 PP_Resource ResourceCreationImpl::CreateHostResolverPrivate(
     PP_Instance instance) {
@@ skipping 232 matching lines @@
                                                       wheel_ticks,
                                                       scroll_by_page);
 }
 
 PP_Resource ResourceCreationImpl::CreateX509CertificatePrivate(
     PP_Instance instance) {
   return 0;  // Not supported in-process.
 }
 
 }  // namespace content