[WIP] cc: Plumb SurfaceId from clients

content/renderer/gpu/compositor_output_surface.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/gpu/compositor_output_surface.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/managed_memory_policy.h"
 #include "cc/output/output_surface_client.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
 #include "content/common/view_messages.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/gpu/frame_swap_message_queue.h"
 #include "content/renderer/render_thread_impl.h"
 #include "gpu/command_buffer/client/context_support.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "gpu/ipc/client/command_buffer_proxy_impl.h"
 #include "ipc/ipc_sync_channel.h"
+#include "ui/gfx/geometry/dip_util.h"
 
 namespace content {
 
 CompositorOutputSurface::CompositorOutputSurface(
     int32_t routing_id,
     uint32_t output_surface_id,
     scoped_refptr<cc::ContextProvider> context_provider,
     scoped_refptr<cc::ContextProvider> worker_context_provider,
     scoped_refptr<FrameSwapMessageQueue> swap_frame_message_queue)
     : OutputSurface(std::move(context_provider),
                     std::move(worker_context_provider),
                     nullptr),
       output_surface_id_(output_surface_id),
       output_surface_filter_(
           RenderThreadImpl::current()->compositor_message_filter()),
       message_sender_(RenderThreadImpl::current()->sync_message_filter()),
       frame_swap_message_queue_(swap_frame_message_queue),
+      allocator_(0),
+      current_scale_factor_(1.f),
       routing_id_(routing_id) {
   DCHECK(output_surface_filter_);
   DCHECK(frame_swap_message_queue_);
   DCHECK(message_sender_);
   capabilities_.delegated_rendering = true;
 }
 
 CompositorOutputSurface::CompositorOutputSurface(
     int32_t routing_id,
     uint32_t output_surface_id,
     scoped_refptr<cc::VulkanContextProvider> vulkan_context_provider,
     scoped_refptr<FrameSwapMessageQueue> swap_frame_message_queue)
     : OutputSurface(std::move(vulkan_context_provider)),
       output_surface_id_(output_surface_id),
       output_surface_filter_(
           RenderThreadImpl::current()->compositor_message_filter()),
       message_sender_(RenderThreadImpl::current()->sync_message_filter()),
       frame_swap_message_queue_(swap_frame_message_queue),
+      allocator_(0),
+      current_scale_factor_(1.f),
       routing_id_(routing_id) {
   DCHECK(output_surface_filter_);
   DCHECK(frame_swap_message_queue_);
   DCHECK(message_sender_);
   capabilities_.delegated_rendering = true;
 }
 
 CompositorOutputSurface::~CompositorOutputSurface() = default;
 
 bool CompositorOutputSurface::BindToClient(
@@ skipping 25 matching lines @@
     return;
   if (output_surface_proxy_) {
     output_surface_proxy_->ClearOutputSurface();
     output_surface_filter_->RemoveHandlerOnCompositorThread(
         routing_id_, output_surface_filter_handler_);
   }
   cc::OutputSurface::DetachFromClient();
 }
 
 void CompositorOutputSurface::SwapBuffers(cc::CompositorFrame frame) {
+  cc::RenderPass* root_pass =
+      frame.delegated_frame_data->render_pass_list.back().get();
+  float frame_device_scale_factor = frame.metadata.device_scale_factor;
+  gfx::Size frame_size = root_pass->output_rect.size();
+  gfx::Size frame_size_in_dip =
+      gfx::ConvertSizeToDIP(frame_device_scale_factor, frame_size);
+  if (surface_id_.is_null() || frame_size != current_surface_size_ ||
+      frame_size_in_dip != current_surface_size_in_dip_) {
+    surface_id_ = allocator_.GenerateId();
+    current_surface_size_ = frame_size;
+    current_surface_size_in_dip_ = frame_size_in_dip;
+    current_scale_factor_ = frame_device_scale_factor;
+  }
+
   {
     std::unique_ptr<FrameSwapMessageQueue::SendMessageScope>
         send_message_scope =
             frame_swap_message_queue_->AcquireSendMessageScope();
     std::vector<std::unique_ptr<IPC::Message>> messages;
     std::vector<IPC::Message> messages_to_deliver_with_frame;
     frame_swap_message_queue_->DrainMessages(&messages);
     FrameSwapMessageQueue::TransferMessages(&messages,
                                             &messages_to_deliver_with_frame);
     Send(new ViewHostMsg_SwapCompositorFrame(routing_id_, output_surface_id_,
-                                             frame,
+                                             surface_id_, frame,
                                              messages_to_deliver_with_frame));
     // ~send_message_scope.
   }
 }
 
 void CompositorOutputSurface::BindFramebuffer() {
   // This is a delegating output surface, no framebuffer/direct drawing support.
   NOTREACHED();
 }
 
@@ skipping 37 matching lines @@
   ReclaimResources(resources);
   if (is_swap_ack)
     client_->DidSwapBuffersComplete();
 }
 
 bool CompositorOutputSurface::Send(IPC::Message* message) {
   return message_sender_->Send(message);
 }
 
 }  // namespace content