IPC pickling optimization for render passes.

content/common/cc_messages.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/common/cc_messages.h"
 
 #include "base/command_line.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/filter_operations.h"
 #include "content/public/common/common_param_traits.h"
@@ skipping 351 matching lines @@
     if (shared_quad_state_index >= sqs_list.size()) {
       WriteParam(m, bad_index);
       continue;
     }
 
     DCHECK_LT(shared_quad_state_index, p.shared_quad_state_list.size());
     WriteParam(m, shared_quad_state_index);
   }
 }
 
+size_t ParamTraits<cc::RenderPass>::ReserveSizeForWrite(const param_type& p) {
+  size_t to_reserve = sizeof(cc::RenderPass);
+
+  to_reserve += p.shared_quad_state_list.size() * sizeof(cc::SharedQuadState);
+
+  // The shared_quad_state_index for each quad.
+  to_reserve += p.quad_list.size() * sizeof(size_t);
+
+  // The largest quad type, verified by a unit test.
+  to_reserve += p.quad_list.size() * sizeof(cc::RenderPassDrawQuad);
+  return to_reserve;
+}
+
 template<typename QuadType>
 static scoped_ptr<cc::DrawQuad> ReadDrawQuad(const Message* m,
                                              PickleIterator* iter) {
   scoped_ptr<QuadType> quad = QuadType::Create();
   if (!ReadParam(m, iter, quad.get()))
     return scoped_ptr<QuadType>().template PassAs<cc::DrawQuad>();
   return quad.template PassAs<cc::DrawQuad>();
 }
 
 bool ParamTraits<cc::RenderPass>::Read(
@@ skipping 291 matching lines @@
   LogParam(p.last_software_frame_id, l);
   l->append(", ");
   if (p.gl_frame_data)
     LogParam(*p.gl_frame_data, l);
   l->append(")");
 }
 
 void ParamTraits<cc::DelegatedFrameData>::Write(Message* m,
                                                 const param_type& p) {
   DCHECK_NE(0u, p.render_pass_list.size());
+
+  size_t to_reserve = p.resource_list.size() * sizeof(cc::TransferableResource);
+  for (size_t i = 0; i < p.render_pass_list.size(); ++i) {
+    const cc::RenderPass* pass = p.render_pass_list[i];
+    to_reserve += ParamTraits<cc::RenderPass>::ReserveSizeForWrite(*pass);
+  }
+  m->Reserve(to_reserve);
+
   WriteParam(m, p.resource_list);
   WriteParam(m, p.render_pass_list.size());
   for (size_t i = 0; i < p.render_pass_list.size(); ++i)
     WriteParam(m, *p.render_pass_list[i]);
 }
 
 bool ParamTraits<cc::DelegatedFrameData>::Read(const Message* m,
                                                PickleIterator* iter,
                                                param_type* p) {
   const static size_t kMaxRenderPasses = 10000;
@@ skipping 19 matching lines @@
   l->append(", [");
   for (size_t i = 0; i < p.render_pass_list.size(); ++i) {
     if (i)
       l->append(", ");
     LogParam(*p.render_pass_list[i], l);
   }
   l->append("])");
 }
 
 }  // namespace IPC