Enforce constant size and device scale factor for surfaces

cc/surfaces/surface.cc

 // Copyright 2014 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 "cc/surfaces/surface.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 
 #include "base/stl_util.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/surfaces/compositor_frame_sink_support.h"
 #include "cc/surfaces/local_surface_id_allocator.h"
 #include "cc/surfaces/surface_manager.h"
 #include "cc/surfaces/surface_resource_holder_client.h"
 
 namespace cc {
 
 // The frame index starts at 2 so that empty frames will be treated as
 // completely damaged the first time they're drawn from.
 static const int kFrameIndexStart = 2;
 
 Surface::Surface(
-    const SurfaceId& id,
+    const SurfaceInfo& surface_info,
     base::WeakPtr<CompositorFrameSinkSupport> compositor_frame_sink_support)
-    : surface_id_(id),
-      previous_frame_surface_id_(id),
+    : surface_info_(surface_info),
+      previous_frame_surface_id_(surface_info.id()),
       compositor_frame_sink_support_(std::move(compositor_frame_sink_support)),
       surface_manager_(compositor_frame_sink_support_->surface_manager()),
       frame_index_(kFrameIndexStart),
       destroyed_(false) {}
 
 Surface::~Surface() {
   ClearCopyRequests();
   surface_manager_->SurfaceDiscarded(this);
 
   UnrefFrameResourcesAndRunDrawCallback(std::move(pending_frame_data_));
   UnrefFrameResourcesAndRunDrawCallback(std::move(active_frame_data_));
 }
 
 void Surface::SetPreviousFrameSurface(Surface* surface) {
   DCHECK(surface && (HasActiveFrame() || HasPendingFrame()));
   frame_index_ = surface->frame_index() + 1;
   previous_frame_surface_id_ = surface->surface_id();
   CompositorFrame& frame = active_frame_data_ ? active_frame_data_->frame
                                               : pending_frame_data_->frame;
   surface->TakeLatencyInfo(&frame.metadata.latency_info);
   surface->TakeLatencyInfoFromPendingFrame(&frame.metadata.latency_info);
 }
 
 void Surface::Close() {
   closed_ = true;
 }
 
-void Surface::QueueFrame(CompositorFrame frame,
+bool Surface::QueueFrame(CompositorFrame frame,
                          const base::Closure& callback,
                          const WillDrawCallback& will_draw_callback) {
+  gfx::Size frame_size = frame.render_pass_list.back()->output_rect.size();
+  float device_scale_factor = frame.metadata.device_scale_factor;
+
+  if (frame_size != surface_info_.size_in_pixels() ||
+      device_scale_factor != surface_info_.device_scale_factor()) {
+    TRACE_EVENT_INSTANT0("cc", "Surface invariants violation",
+                         TRACE_EVENT_SCOPE_THREAD);
+    return false;
+  }
+
   if (closed_) {
     if (compositor_frame_sink_support_) {
       ReturnedResourceArray resources;
       TransferableResource::ReturnResources(frame.resource_list, &resources);
       compositor_frame_sink_support_->ReturnResources(resources);
     }
     callback.Run();
-    return;
+    return true;
   }
 
   TakeLatencyInfoFromPendingFrame(&frame.metadata.latency_info);
 
   base::Optional<FrameData> previous_pending_frame_data =
       std::move(pending_frame_data_);
   pending_frame_data_.reset();
 
   UpdateBlockingSurfaces(previous_pending_frame_data.has_value(), frame);
 
@@ skipping 28 matching lines @@
     // Ask the surface manager to inform |this| when its dependencies are
     // resolved.
     surface_manager_->RequestSurfaceResolution(this);
   } else {
     // If there are no blockers, then immediately activate the frame.
     ActivateFrame(FrameData(std::move(frame), callback, will_draw_callback));
   }
 
   // Returns resources for the previous pending frame.
   UnrefFrameResourcesAndRunDrawCallback(std::move(previous_pending_frame_data));
+
+  return true;
 }
 
 void Surface::RequestCopyOfOutput(
     std::unique_ptr<CopyOutputRequest> copy_request) {
   if (!active_frame_data_) {
     copy_request->SendEmptyResult();
     return;
   }
 
   std::vector<std::unique_ptr<CopyOutputRequest>>& copy_requests =
@@ skipping 173 matching lines @@
     base::Closure callback = active_frame_data_->draw_callback;
     active_frame_data_->draw_callback = base::Closure();
     callback.Run();
   }
 }
 
 void Surface::RunWillDrawCallback(const gfx::Rect& damage_rect) {
   if (!active_frame_data_ || active_frame_data_->will_draw_callback.is_null())
     return;
 
-  active_frame_data_->will_draw_callback.Run(surface_id_.local_surface_id(),
+  active_frame_data_->will_draw_callback.Run(surface_id().local_surface_id(),
                                              damage_rect);
 }
 
 void Surface::AddDestructionDependency(SurfaceSequence sequence) {
   destruction_dependencies_.push_back(sequence);
 }
 
 void Surface::SatisfyDestructionDependencies(
     std::unordered_set<SurfaceSequence, SurfaceSequenceHash>* sequences,
     std::unordered_set<FrameSinkId, FrameSinkIdHash>* valid_frame_sink_ids) {
@@ skipping 45 matching lines @@
     frame->metadata.latency_info.swap(*latency_info);
     return;
   }
   std::copy(frame->metadata.latency_info.begin(),
             frame->metadata.latency_info.end(),
             std::back_inserter(*latency_info));
   frame->metadata.latency_info.clear();
 }
 
 }  // namespace cc