Bug 1386188 - Support filter for layers-free mode. r=kats

MozReview-Commit-ID: LuPnaSjhjgk

layout/painting/nsDisplayList.cpp

@@ -9132,6 +9132,43 @@ nsDisplayFilter::PaintAsLayer(nsDisplayListBuilder* aBuilder,
   nsDisplayFilterGeometry::UpdateDrawResult(this, imgParams.result);
 }
 
+bool
+nsDisplayFilter::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder& aBuilder,
+                                         const StackingContextHelper& aSc,
+                                         nsTArray<WebRenderParentCommand>& aParentCommands,
+                                         mozilla::layers::WebRenderLayerManager* aManager,
+                                         nsDisplayListBuilder* aDisplayListBuilder)
+{
+  if (aManager->IsLayersFreeTransaction()) {
+    ContainerLayerParameters parameter;
+    if (GetLayerState(aDisplayListBuilder, aManager, parameter) != LAYER_ACTIVE) {
+      // TODO: should have a fallback path to paint the child list
+      return false;
+    }
+  }
+
+  nsTArray<mozilla::wr::WrFilterOp> wrFilters;
+  const nsTArray<nsStyleFilter>& filters = mFrame->StyleEffects()->mFilters;
+  nsTArray<layers::CSSFilter> cssFilters = nsTArray<layers::CSSFilter>(filters.Length());
+  for (const nsStyleFilter& filter : filters) {
+    wrFilters.AppendElement(wr::ToWrFilterOp(ToCSSFilter(filter)));
+  }
+
+  StackingContextHelper sc(aSc,
+                           aBuilder,
+                           aDisplayListBuilder,
+                           this,
+                           &mList,
+                           nullptr,
+                           0,
+                           nullptr,
+                           nullptr,
+                           wrFilters);
+
+  nsDisplaySVGEffects::CreateWebRenderCommands(aBuilder, sc, aParentCommands, aManager, aDisplayListBuilder);
+  return true;
+}
+
 #ifdef MOZ_DUMP_PAINTING
 void
 nsDisplayFilter::PrintEffects(nsACString& aTo)

layout/painting/nsDisplayList.h

@@ -4586,6 +4586,12 @@ public:
   void PaintAsLayer(nsDisplayListBuilder* aBuilder,
                     gfxContext* aCtx,
                     LayerManager* aManager);
+
+  virtual bool CreateWebRenderCommands(mozilla::wr::DisplayListBuilder& aBuilder,
+                                       const StackingContextHelper& aSc,
+                                       nsTArray<WebRenderParentCommand>& aParentCommands,
+                                       mozilla::layers::WebRenderLayerManager* aManager,
+                                       nsDisplayListBuilder* aDisplayListBuilder) override;
 };
 
 /* A display item that applies a transformation to all of its descendant