Delete background tab IOSurfaces on Mac.

content/browser/renderer_host/render_widget_host_impl.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/browser/renderer_host/render_widget_host_impl.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 557 matching lines @@
                                        const gfx::Size& page_size,
                                        const gfx::Size& desired_size) {
   // Ask the renderer to create a bitmap regardless of whether it's
   // hidden, being resized, redrawn, etc.  It resizes the web widget
   // to the page_size and then scales it to the desired_size.
   Send(new ViewMsg_PaintAtSize(routing_id_, dib_handle, tag,
                                page_size, desired_size));
 }
 
 BackingStore* RenderWidgetHostImpl::GetBackingStore(bool force_create) {
+  if (!view_)
+    return NULL;
+
+  // Get the desired size from the current view bounds.
+  gfx::Rect view_rect = view_->GetViewBounds();
+  if (view_rect.IsEmpty())
+    return NULL;
+  gfx::Size view_size = view_rect.size();
+
   TRACE_EVENT2("renderer_host", "RenderWidgetHostImpl::GetBackingStore",
-               "width", base::IntToString(current_size_.width()),
-               "height", base::IntToString(current_size_.height()));
+               "width", base::IntToString(view_size.width()),
+               "height", base::IntToString(view_size.height()));
 
   // We should not be asked to paint while we are hidden.  If we are hidden,
   // then it means that our consumer failed to call WasRestored. If we're not
   // force creating the backing store, it's OK since we can feel free to give
   // out our cached one if we have it.
   DCHECK(!is_hidden_ || !force_create) <<
       "GetBackingStore called while hidden!";
 
   // We should never be called recursively; this can theoretically lead to
   // infinite recursion and almost certainly leads to lower performance.
   DCHECK(!in_get_backing_store_) << "GetBackingStore called recursively!";
   AutoReset<bool> auto_reset_in_get_backing_store(&in_get_backing_store_, true);
 
+  // If there's an accelerated surface, return NULL now. The caller will need
+  // to confirm whether there is an accelerated frame after GetBackingStore
+  // returns.
+  if (view_->HasAcceleratedSurface(view_size))
+    return NULL;
+
   // We might have a cached backing store that we can reuse!
   BackingStore* backing_store =
-      BackingStoreManager::GetBackingStore(this, current_size_);
+      BackingStoreManager::GetBackingStore(this, view_size);
   if (!force_create)
     return backing_store;
 
   // If we fail to find a backing store in the cache, send out a request
   // to the renderer to paint the view if required.
   if (!backing_store && !repaint_ack_pending_ && !resize_ack_pending_ &&
       !view_being_painted_) {
     repaint_start_time_ = TimeTicks::Now();
     repaint_ack_pending_ = true;
-    Send(new ViewMsg_Repaint(routing_id_, current_size_));
+    Send(new ViewMsg_Repaint(routing_id_, view_size));
   }
 
   // When we have asked the RenderWidget to resize, and we are still waiting on
   // a response, block for a little while to see if we can't get a response
   // before returning the old (incorrectly sized) backing store.
   if (resize_ack_pending_ || !backing_store) {
     IPC::Message msg;
     TimeDelta max_delay = TimeDelta::FromMilliseconds(kPaintMsgTimeoutMS);
-    if (process_->WaitForUpdateMsg(routing_id_, max_delay, &msg)) {
-      OnMessageReceived(msg);
-      backing_store = BackingStoreManager::GetBackingStore(this, current_size_);
-    }
+    TimeTicks end_time = TimeTicks::Now() + max_delay;
+    do {
+      TRACE_EVENT0("renderer_host", "GetBackingStore::WaitForUpdate");
+
+      view_->AboutToWaitForUpdateMsg();
+      if (process_->WaitForUpdateMsg(routing_id_, max_delay, &msg)) {
+        OnMessageReceived(msg);
+        backing_store = BackingStoreManager::GetBackingStore(this, view_size);
+        // Break now if we got a backing store or accelerated surface of the
+        // correct size.
+        if (view_->HasAcceleratedSurface(view_size))
+          return NULL;
+        backing_store = BackingStoreManager::GetBackingStore(this, view_size);

[piman, 2012/04/18 20:02:00]

Why doing this twice?

[jbates, 2012/04/18 23:01:58]

Copy-paste error. Deleted the first instance.

+        if (backing_store)
+          return backing_store;
+      } else {
+        TRACE_EVENT0("renderer_host", "GetBackingStore::Timeout");
+        break;
+      }
+
+      // Loop if we still have time left and haven't gotten a properly sized
+      // frame yet. This is necessary to support the GPU path which typically
+      // has multiple frames pipelined -- we may need to skip one or two
+      // UpdateRects to get to the latest.
+      max_delay = end_time - TimeTicks::Now();
+    } while (max_delay > TimeDelta::FromSeconds(0));
   }
 
+  // If we have still failed to get a backing store of view_size, fall back on
+  // current_size_ to attempt to avoid a white flash while resizing slow pages.
+  if (!backing_store)
+    backing_store = BackingStoreManager::GetBackingStore(this, current_size_);
+
   return backing_store;
 }
 
 BackingStore* RenderWidgetHostImpl::AllocBackingStore(const gfx::Size& size) {
   if (!view_)
     return NULL;
   return view_->AllocBackingStore(size);
 }
 
 void RenderWidgetHostImpl::DonePaintingToBackingStore() {
@@ skipping 508 matching lines @@
   std::pair<int, gfx::Size> details = std::make_pair(tag, size);
   NotificationService::current()->Notify(
       NOTIFICATION_RENDER_WIDGET_HOST_DID_RECEIVE_PAINT_AT_SIZE_ACK,
       Source<RenderWidgetHost>(this),
       Details<std::pair<int, gfx::Size> >(&details));
 }
 
 void RenderWidgetHostImpl::OnMsgUpdateRect(
     const ViewHostMsg_UpdateRect_Params& params) {
   TRACE_EVENT0("renderer_host", "RenderWidgetHostImpl::OnMsgUpdateRect");
+
+  if (params.gpu_surface_id) {
+    GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params gpu_params;
+    gpu_params.surface_id = params.gpu_surface_id;
+    gpu_params.surface_handle = params.gpu_surface_handle;
+    gpu_params.route_id = params.gpu_route_id;
+#if defined(OS_MACOSX)
+    // Compositor window is always gfx::kNullPluginWindow.
+    // TODO(jbates) This will be removed when there are no plugin windows.
+    gpu_params.window = gfx::kNullPluginWindow;
+#endif
+    view_->AcceleratedSurfaceBuffersSwapped(gpu_params,
+                                            params.gpu_process_host_id);
+    // Nothing more to do, because this type of UpdateRect only contains
+    // SwapBuffers state. The real UpdateRect will be sent later by the
+    // renderer.
+    return;
+  }
+
   TimeTicks paint_start = TimeTicks::Now();
 
   // Update our knowledge of the RenderWidget's size.
   current_size_ = params.view_size;
   // Update our knowledge of the RenderWidget's scroll offset.
   last_scroll_offset_ = params.scroll_offset;
 
   bool is_resize_ack =
       ViewHostMsg_UpdateRect_Flags::is_resize_ack(params.flags);
 
   // resize_ack_pending_ needs to be cleared before we call DidPaintRect, since
   // that will end up reaching GetBackingStore.
   if (is_resize_ack) {
     DCHECK(resize_ack_pending_);
     resize_ack_pending_ = false;
     in_flight_size_.SetSize(0, 0);
   }
 
   bool is_repaint_ack =
       ViewHostMsg_UpdateRect_Flags::is_repaint_ack(params.flags);
   if (is_repaint_ack) {
     repaint_ack_pending_ = false;
     TimeDelta delta = TimeTicks::Now() - repaint_start_time_;
     UMA_HISTOGRAM_TIMES("MPArch.RWH_RepaintDelta", delta);
   }
 
   DCHECK(!params.view_size.IsEmpty());
 
   bool was_async = false;
-  if (!is_accelerated_compositing_active_) {
+
+  // If this is a GPU UpdateRect, params.bitmap is invalid and dib will be NULL.
+  TransportDIB* dib = process_->GetTransportDIB(params.bitmap);
+
+  // If gpu process does painting, scroll_rect and copy_rects are always empty
+  // and backing store is never used.
+  if (dib) {
     DCHECK(!params.bitmap_rect.IsEmpty());
     const size_t size = params.bitmap_rect.height() *
         params.bitmap_rect.width() * 4;
-    TransportDIB* dib = process_->GetTransportDIB(params.bitmap);
+    if (dib->size() < size) {
+      DLOG(WARNING) << "Transport DIB too small for given rectangle";
+      RecordAction(UserMetricsAction("BadMessageTerminate_RWH1"));
+      GetProcess()->ReceivedBadMessage();
+    } else {
+      UNSHIPPED_TRACE_EVENT_INSTANT2("test_latency", "UpdateRect",
+          "x+y", params.bitmap_rect.x() + params.bitmap_rect.y(),
+          "color", 0xffffff & *static_cast<uint32*>(dib->memory()));
+      UNSHIPPED_TRACE_EVENT_INSTANT1("test_latency", "UpdateRectWidth",
+          "width", params.bitmap_rect.width());
 
-    // If gpu process does painting, scroll_rect and copy_rects are always empty
-    // and backing store is never used.
-    if (dib) {
-      if (dib->size() < size) {
-        DLOG(WARNING) << "Transport DIB too small for given rectangle";
-        RecordAction(UserMetricsAction("BadMessageTerminate_RWH1"));
-        GetProcess()->ReceivedBadMessage();
-      } else {
-        UNSHIPPED_TRACE_EVENT_INSTANT2("test_latency", "UpdateRect",
-            "x+y", params.bitmap_rect.x() + params.bitmap_rect.y(),
-            "color", 0xffffff & *static_cast<uint32*>(dib->memory()));
-        UNSHIPPED_TRACE_EVENT_INSTANT1("test_latency", "UpdateRectWidth",
-            "width", params.bitmap_rect.width());
+      // Scroll the backing store.
+      if (!params.scroll_rect.IsEmpty()) {
+        ScrollBackingStoreRect(params.dx, params.dy,
+                               params.scroll_rect,
+                               params.view_size);
+      }
 
-        // Scroll the backing store.
-        if (!params.scroll_rect.IsEmpty()) {
-          ScrollBackingStoreRect(params.dx, params.dy,
-                                 params.scroll_rect,
-                                 params.view_size);
-        }
-
-        // Paint the backing store. This will update it with the
-        // renderer-supplied bits. The view will read out of the backing store
-        // later to actually draw to the screen.
-        was_async = PaintBackingStoreRect(
-            params.bitmap,
-            params.bitmap_rect,
-            params.copy_rects,
-            params.view_size,
-            base::Bind(&RenderWidgetHostImpl::DidUpdateBackingStore,
-                       weak_factory_.GetWeakPtr(), params, paint_start));
-      }
+      // Paint the backing store. This will update it with the
+      // renderer-supplied bits. The view will read out of the backing store
+      // later to actually draw to the screen.
+      was_async = PaintBackingStoreRect(
+          params.bitmap,
+          params.bitmap_rect,
+          params.copy_rects,
+          params.view_size,
+          base::Bind(&RenderWidgetHostImpl::DidUpdateBackingStore,
+                     weak_factory_.GetWeakPtr(), params, paint_start));
     }
   }
 
   if (!was_async) {
     DidUpdateBackingStore(params, paint_start);
   }
 
   if (should_auto_resize_) {
     bool post_callback = new_auto_size_.IsEmpty();
     new_auto_size_ = params.view_size;
@@ skipping 500 matching lines @@
   // indicate that no callback is in progress (i.e. without this line
   // DelayedAutoResized will not get called again).
   new_auto_size_.SetSize(0, 0);
   if (!should_auto_resize_)
     return;
 
   OnRenderAutoResized(new_size);
 }
 
 }  // namespace content