cc::ResourcePool - Re-use larger resources for smaller requests

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 <stddef.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 525 matching lines @@
   settings.max_staging_buffer_usage_in_bytes = 32 * 1024 * 1024;  // 32MB
   // Use 1/4th of staging buffers on low-end devices.
   if (base::SysInfo::IsLowEndDevice())
     settings.max_staging_buffer_usage_in_bytes /= 4;
 
   cc::ManagedMemoryPolicy defaults = settings.gpu_memory_policy;
   settings.gpu_memory_policy = GetGpuMemoryPolicy(defaults);
   settings.software_memory_policy.num_resources_limit =
       base::SharedMemory::GetHandleLimit() / 3;
 
+  settings.disallow_non_exact_resource_reuse =
+      cmd.HasSwitch(cc::switches::kDisallowNonExactResourceReuse);
+  settings.renderer_settings.disallow_non_exact_resource_reuse =
+      settings.disallow_non_exact_resource_reuse;
+
   return settings;
 }
 
 // static
 cc::ManagedMemoryPolicy RenderWidgetCompositor::GetGpuMemoryPolicy(
     const cc::ManagedMemoryPolicy& default_policy) {
   cc::ManagedMemoryPolicy actual = default_policy;
   actual.bytes_limit_when_visible = 0;
 
   // If the value was overridden on the command line, use the specified value.
@@ skipping 652 matching lines @@
     const cc::LocalSurfaceId& local_surface_id) {
   layer_tree_host_->SetLocalSurfaceId(local_surface_id);
 }
 
 void RenderWidgetCompositor::NotifySwapTime(ReportTimeCallback callback) {
   QueueSwapPromise(base::MakeUnique<ReportTimeSwapPromise>(
       std::move(callback), base::ThreadTaskRunnerHandle::Get()));
 }
 
 }  // namespace content