Move SharedRendererState ownership to AwContents

android_webview/browser/browser_view_renderer.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 "android_webview/browser/browser_view_renderer.h"
 
 #include <utility>
 
 #include "android_webview/browser/browser_view_renderer_client.h"
 #include "android_webview/browser/child_frame.h"
@@ skipping 70 matching lines @@
 BrowserViewRenderer* BrowserViewRenderer::FromWebContents(
     content::WebContents* web_contents) {
   return BrowserViewRendererUserData::GetBrowserViewRenderer(web_contents);
 }
 
 BrowserViewRenderer::BrowserViewRenderer(
     BrowserViewRendererClient* client,
     const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
     bool disable_page_visibility)
     : client_(client),
-      shared_renderer_state_(ui_task_runner, this),
+      shared_renderer_state_(nullptr),
       ui_task_runner_(ui_task_runner),
       disable_page_visibility_(disable_page_visibility),
       compositor_(NULL),
       is_paused_(false),
       view_visible_(false),
       window_visible_(false),
       attached_to_window_(false),
       hardware_enabled_(false),
       dip_scale_(0.f),
       page_scale_factor_(1.f),
       min_page_scale_factor_(0.f),
       max_page_scale_factor_(0.f),
       on_new_picture_enable_(false),
       clear_view_(false),
       offscreen_pre_raster_(false),
       next_compositor_id_(1) {}
 
 BrowserViewRenderer::~BrowserViewRenderer() {
   DCHECK(compositor_map_.empty());
+  SetSharedRendererState(nullptr);
 }
 
 void BrowserViewRenderer::RegisterWithWebContents(
     content::WebContents* web_contents) {
   web_contents->SetUserData(kBrowserViewRendererUserDataKey,
                             new BrowserViewRendererUserData(this));
 }
 
+void BrowserViewRenderer::SetSharedRendererState(
+    SharedRendererState* shared_renderer_state) {
+  if (shared_renderer_state_ == shared_renderer_state) return;
+
+  if (shared_renderer_state_) {
+    shared_renderer_state_->SetBrowserViewRendererOnUI(nullptr);
+  }
+  shared_renderer_state_ = shared_renderer_state;
+  if (shared_renderer_state_) {
+    shared_renderer_state_->SetBrowserViewRendererOnUI(this);
+  }
+}
+
 SharedRendererState* BrowserViewRenderer::GetAwDrawGLViewContext() {
-  return &shared_renderer_state_;
+  return shared_renderer_state_;
 }
 
 bool BrowserViewRenderer::RequestDrawGL(bool wait_for_completion) {
   return client_->RequestDrawGL(wait_for_completion);
 }
 
 void BrowserViewRenderer::TrimMemory(const int level, const bool visible) {
   DCHECK(ui_task_runner_->BelongsToCurrentThread());
   // Constants from Android ComponentCallbacks2.
   enum {
@@ skipping 14 matching lines @@
     return;
 
   // Nothing to drop.
   if (!compositor_ || !hardware_enabled_)
     return;
 
   TRACE_EVENT0("android_webview", "BrowserViewRenderer::TrimMemory");
 
   // If offscreen pre-raster is disabled, drop everything in hardware. Otherwise
   // keep the tiles and just delete the HardwareRenderer.
-  if (level >= TRIM_MEMORY_MODERATE) {
+  if (level >= TRIM_MEMORY_MODERATE && shared_renderer_state_) {

[boliu, 2016/03/23 15:47:20]

this should just be aw_contents -> SRS call, no need to go through BVR

     if (offscreen_pre_raster_)
-      shared_renderer_state_.DeleteHardwareRendererOnUI();
+      shared_renderer_state_->DeleteHardwareRendererOnUI();
     else
-      shared_renderer_state_.ReleaseHardwareDrawIfNeededOnUI();
+      shared_renderer_state_->ReleaseHardwareDrawIfNeededOnUI();
     return;
   }
 
   // Just set the memory limit to 0 and drop all tiles. This will be reset to
   // normal levels in the next DrawGL call.
   // TODO(hush): need to setMemoryPolicy to 0 for non-current compositors too.
   // But WebView only has non-current compositors temporarily. So don't have to
   // do it now.
   if (!offscreen_pre_raster_)
     compositor_->SetMemoryPolicy(0u);
 }
 
 void BrowserViewRenderer::UpdateMemoryPolicy() {
-  if (!hardware_enabled_) {
+  if (!hardware_enabled_ || !shared_renderer_state_) {
     compositor_->SetMemoryPolicy(0u);
     return;
   }
 
   size_t bytes_limit = 0u;
   if (g_memory_override_in_bytes) {
     bytes_limit = static_cast<size_t>(g_memory_override_in_bytes);
   } else {
     ParentCompositorDrawConstraints parent_draw_constraints =
-        shared_renderer_state_.GetParentDrawConstraintsOnUI();
+        shared_renderer_state_->GetParentDrawConstraintsOnUI();
     gfx::Rect interest_rect =
         offscreen_pre_raster_ || parent_draw_constraints.is_layer
             ? gfx::Rect(size_)
             : last_on_draw_global_visible_rect_;
     size_t width = interest_rect.width();
     size_t height = interest_rect.height();
     bytes_limit = kMemoryMultiplier * kBytesPerPixel * width * height;
     // Round up to a multiple of kMemoryAllocationStep.
     bytes_limit =
         (bytes_limit / kMemoryAllocationStep + 1) * kMemoryAllocationStep;
@@ skipping 17 matching lines @@
   if (clear_view_) {
     TRACE_EVENT_INSTANT0("android_webview", "EarlyOut_ClearView",
                          TRACE_EVENT_SCOPE_THREAD);
     return false;
   }
 
   return true;
 }
 
 bool BrowserViewRenderer::OnDrawHardware() {
+  DCHECK(shared_renderer_state_);
   TRACE_EVENT0("android_webview", "BrowserViewRenderer::OnDrawHardware");
-
-  shared_renderer_state_.InitializeHardwareDrawIfNeededOnUI();
+  shared_renderer_state_->InitializeHardwareDrawIfNeededOnUI();
 
   if (!CanOnDraw()) {
     return false;
   }
 
-  shared_renderer_state_.SetScrollOffsetOnUI(last_on_draw_scroll_offset_);
+  shared_renderer_state_->SetScrollOffsetOnUI(last_on_draw_scroll_offset_);
   hardware_enabled_ = true;
 
   ReturnResourceFromParent();
   UpdateMemoryPolicy();
 
   ParentCompositorDrawConstraints parent_draw_constraints =
-      shared_renderer_state_.GetParentDrawConstraintsOnUI();
+      shared_renderer_state_->GetParentDrawConstraintsOnUI();
   gfx::Size surface_size(size_);
   gfx::Rect viewport(surface_size);
   gfx::Rect clip = viewport;
   gfx::Transform transform_for_tile_priority =
       parent_draw_constraints.transform;
 
   // If the WebView is on a layer, WebView does not know what transform is
   // applied onto the layer so global visible rect does not make sense here.
   // In this case, just use the surface rect for tiling.
   gfx::Rect viewport_rect_for_tile_priority;
 
   // Leave viewport_rect_for_tile_priority empty if offscreen_pre_raster_ is on.
   if (!offscreen_pre_raster_ && !parent_draw_constraints.is_layer) {
     viewport_rect_for_tile_priority = last_on_draw_global_visible_rect_;
   }
 
   content::SynchronousCompositor::Frame frame =
       compositor_->DemandDrawHw(surface_size,
                                 gfx::Transform(),
                                 viewport,
                                 clip,
                                 viewport_rect_for_tile_priority,
                                 transform_for_tile_priority);
   if (!frame.frame.get()) {
     TRACE_EVENT_INSTANT0("android_webview", "NoNewFrame",
                          TRACE_EVENT_SCOPE_THREAD);
-    return shared_renderer_state_.HasFrameOnUI();
+    return shared_renderer_state_->HasFrameOnUI();
   }
 
   scoped_ptr<ChildFrame> child_frame = make_scoped_ptr(new ChildFrame(
       frame.output_surface_id, std::move(frame.frame),
       GetCompositorID(compositor_), viewport_rect_for_tile_priority.IsEmpty(),
       transform_for_tile_priority, offscreen_pre_raster_,
       parent_draw_constraints.is_layer));
 
-  ReturnUnusedResource(shared_renderer_state_.PassUncommittedFrameOnUI());
-  shared_renderer_state_.SetCompositorFrameOnUI(std::move(child_frame));
+  ReturnUnusedResource(shared_renderer_state_->PassUncommittedFrameOnUI());
+  shared_renderer_state_->SetCompositorFrameOnUI(std::move(child_frame));
   return true;
 }
 
 void BrowserViewRenderer::UpdateParentDrawConstraints() {
+  DCHECK(shared_renderer_state_);
   PostInvalidate();
   ParentCompositorDrawConstraints parent_draw_constraints =
-      shared_renderer_state_.GetParentDrawConstraintsOnUI();
+      shared_renderer_state_->GetParentDrawConstraintsOnUI();
   client_->ParentDrawConstraintsUpdated(parent_draw_constraints);
 }
 
 void BrowserViewRenderer::ReturnUnusedResource(
     scoped_ptr<ChildFrame> child_frame) {
   if (!child_frame.get() || !child_frame->frame.get())
     return;
 
   cc::CompositorFrameAck frame_ack;
   cc::TransferableResource::ReturnResources(
       child_frame->frame->delegated_frame_data->resource_list,
       &frame_ack.resources);
   content::SynchronousCompositor* compositor =
       compositor_map_[child_frame->compositor_id];
   if (compositor && !frame_ack.resources.empty())
     compositor->ReturnResources(child_frame->output_surface_id, frame_ack);
 }
 
 void BrowserViewRenderer::ReturnResourceFromParent() {
+  DCHECK(shared_renderer_state_);
   SharedRendererState::ReturnedResourcesMap returned_resource_map;
-  shared_renderer_state_.SwapReturnedResourcesOnUI(&returned_resource_map);
+  shared_renderer_state_->SwapReturnedResourcesOnUI(&returned_resource_map);
   for (auto iterator = returned_resource_map.begin();
        iterator != returned_resource_map.end(); iterator++) {
     uint32_t compositor_id = iterator->first;
     content::SynchronousCompositor* compositor = compositor_map_[compositor_id];
     cc::CompositorFrameAck frame_ack;
     frame_ack.resources.swap(iterator->second.resources);
 
     if (compositor && !frame_ack.resources.empty()) {
       compositor->ReturnResources(iterator->second.output_surface_id,
                                   frame_ack);
@@ skipping 104 matching lines @@
                "width",
                width,
                "height",
                height);
   attached_to_window_ = true;
   size_.SetSize(width, height);
   UpdateCompositorIsActive();
 }
 
 void BrowserViewRenderer::OnDetachedFromWindow() {
+  DCHECK(shared_renderer_state_);
   TRACE_EVENT0("android_webview", "BrowserViewRenderer::OnDetachedFromWindow");
-  shared_renderer_state_.ReleaseHardwareDrawIfNeededOnUI();
+  shared_renderer_state_->ReleaseHardwareDrawIfNeededOnUI();
   attached_to_window_ = false;
   DCHECK(!hardware_enabled_);
   UpdateCompositorIsActive();
 }
 
 void BrowserViewRenderer::OnComputeScroll(base::TimeTicks animation_time) {
   if (!compositor_)
     return;
   TRACE_EVENT0("android_webview", "BrowserViewRenderer::OnComputeScroll");
   compositor_->OnComputeScroll(animation_time);
 }
 
 void BrowserViewRenderer::ReleaseHardware() {
+  DCHECK(shared_renderer_state_);
   DCHECK(hardware_enabled_);
-  ReturnUnusedResource(shared_renderer_state_.PassUncommittedFrameOnUI());
+  ReturnUnusedResource(shared_renderer_state_->PassUncommittedFrameOnUI());
   ReturnResourceFromParent();
-  DCHECK(shared_renderer_state_.ReturnedResourcesEmptyOnUI());
+  DCHECK(shared_renderer_state_->ReturnedResourcesEmptyOnUI());
 
   if (compositor_) {
     compositor_->SetMemoryPolicy(0u);
   }
 
   hardware_enabled_ = false;
 }
 
 bool BrowserViewRenderer::IsVisible() const {
   // Ignore |window_visible_| if |attached_to_window_| is false.
@@ skipping 271 matching lines @@
   base::StringAppendF(&str,
                       "overscroll_rounding_error_: %s ",
                       overscroll_rounding_error_.ToString().c_str());
   base::StringAppendF(
       &str, "on_new_picture_enable: %d ", on_new_picture_enable_);
   base::StringAppendF(&str, "clear_view: %d ", clear_view_);
   return str;
 }
 
 }  // namespace android_webview