cc: Trigger GPU rasterization based on a per-layer hint

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #if defined(OS_ANDROID)
@@ skipping 108 matching lines @@
   int max_untiled_layer_height = settings.max_untiled_layer_size.height();
   if (cmd->HasSwitch(switches::kMaxUntiledLayerHeight)) {
     GetSwitchValueAsInt(*cmd, switches::kMaxUntiledLayerHeight, 1,
                         std::numeric_limits<int>::max(),
                         &max_untiled_layer_height);
   }
 
   settings.max_untiled_layer_size = gfx::Size(max_untiled_layer_width,
                                            max_untiled_layer_height);
 
-  settings.impl_side_painting = cc::switches::IsImplSidePaintingEnabled();
-  settings.gpu_rasterization =
-      cc::switches::IsGpuRasterizationEnabled() ||
-      cmd->HasSwitch(switches::kEnableBleedingEdgeRenderingFastPaths);
+  settings.impl_side_painting =
+      RenderThreadImpl::current()->is_impl_side_painting_enabled();
+  webkit::WebLayerImpl::SetImplSidePaintingEnabled(settings.impl_side_painting);

[piman, 2014/03/07 19:41:04]

nit: I'd rather do that in RendetThreadImpl::Init.
This kinda suggests we could change our mind between different instantiations of
the compositor, but we really can't.

[ajuma, 2014/03/07 20:21:11]

Done.

+  if (RenderThreadImpl::current()->is_gpu_rasterization_enabled())
+    settings.rasterization_site = cc::LayerTreeSettings::GpuRasterization;
+  else if (RenderThreadImpl::current()->is_hybrid_rasterization_enabled())
+    settings.rasterization_site = cc::LayerTreeSettings::HybridRasterization;
+  else
+    settings.rasterization_site = cc::LayerTreeSettings::CpuRasterization;
 
   settings.calculate_top_controls_position =
       cmd->HasSwitch(cc::switches::kEnableTopControlsPositionCalculation);
   if (cmd->HasSwitch(cc::switches::kTopControlsHeight)) {
     std::string controls_height_str =
         cmd->GetSwitchValueASCII(cc::switches::kTopControlsHeight);
     double controls_height;
     if (base::StringToDouble(controls_height_str, &controls_height) &&
         controls_height > 0)
       settings.top_controls_height = controls_height;
@@ skipping 21 matching lines @@
       double hide_threshold;
       if (base::StringToDouble(top_threshold_str, &hide_threshold) &&
           hide_threshold >= 0.f && hide_threshold <= 1.f)
         settings.top_controls_hide_threshold = hide_threshold;
   }
 
   settings.background_color_instead_of_checkerboard =
       cmd->HasSwitch(cc::switches::kBackgroundColorInsteadOfCheckerboard);
   settings.show_overdraw_in_tracing =
       cmd->HasSwitch(cc::switches::kTraceOverdraw);
-  settings.can_use_lcd_text = cc::switches::IsLCDTextEnabled();
+  settings.can_use_lcd_text =
+      RenderThreadImpl::current()->is_lcd_text_enabled();
   settings.use_pinch_virtual_viewport =
       cmd->HasSwitch(cc::switches::kEnablePinchVirtualViewport);
   settings.allow_antialiasing &=
       !cmd->HasSwitch(cc::switches::kDisableCompositedAntialiasing);
 
   // These flags should be mirrored by UI versions in ui/compositor/.
   settings.initial_debug_state.show_debug_borders =
       cmd->HasSwitch(cc::switches::kShowCompositedLayerBorders);
   settings.initial_debug_state.show_fps_counter =
       cmd->HasSwitch(cc::switches::kShowFPSCounter);
@@ skipping 45 matching lines @@
             0, 100,
             &max_unused_resource_memory_percentage)) {
       settings.max_unused_resource_memory_percentage =
           max_unused_resource_memory_percentage;
     }
   }
 
   settings.strict_layer_property_change_checking =
       cmd->HasSwitch(cc::switches::kStrictLayerPropertyChangeChecking);
 
-  settings.use_map_image = cc::switches::IsMapImageEnabled();
+  settings.use_map_image = RenderThreadImpl::current()->is_map_image_enabled();
 
 #if defined(OS_ANDROID)
   // TODO(danakj): Move these to the android code.
   settings.max_partial_texture_updates = 0;
   settings.scrollbar_animator = cc::LayerTreeSettings::LinearFade;
   settings.solid_color_scrollbar_color =
       cmd->HasSwitch(switches::kHideScrollbars)
           ? SK_ColorTRANSPARENT
           : SkColorSetARGB(128, 128, 128, 128);
   settings.highp_threshold_min = 2048;
@@ skipping 383 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content