Bug 1372118 - Part3. Implement CreateWebRenderCommands for text, transform and background color. r=jrmuizel, r=kats

MozReview-Commit-ID: JRoSjygSFHc

gfx/layers/wr/StackingContextHelper.cpp

@@ -17,6 +17,33 @@ StackingContextHelper::StackingContextHelper()
   // mOrigin remains at 0,0
 }
 
+StackingContextHelper::StackingContextHelper(const StackingContextHelper& aParentSC,
+                                             wr::DisplayListBuilder& aBuilder,
+                                             LayerRect aBoundForSC,
+                                             LayerPoint aOrigin,
+                                             uint64_t aAnimationsId,
+                                             float* aOpacityPtr,
+                                             gfx::Matrix4x4* aTransformPtr,
+                                             const nsTArray<WrFilterOp>& aFilters)
+  : mBuilder(&aBuilder)
+{
+  WrRect scBounds = aParentSC.ToRelativeWrRect(aBoundForSC);
+  if (aTransformPtr) {
+    mTransform = *aTransformPtr;
+  }
+
+  mBuilder->PushStackingContext(scBounds,
+                                aAnimationsId,
+                                aOpacityPtr,
+                                aTransformPtr,
+                                WrTransformStyle::Flat,
+                                // TODO: set correct blend mode.
+                                wr::ToWrMixBlendMode(gfx::CompositionOp::OP_OVER),
+                                aFilters);
+
+  mOrigin = aOrigin;
+}
+
 StackingContextHelper::StackingContextHelper(const StackingContextHelper& aParentSC,
                                              wr::DisplayListBuilder& aBuilder,
                                              WebRenderLayer* aLayer,