Bug 1394308 - Pass perspective transform attribute to compositor for OMTA, r=kats

MozReview-Commit-ID: EjyuCfnswqu

--HG--
extra : rebase_source : 556db00f7c58b8b49bdafe9ca77785bce819a000

gfx/layers/wr/StackingContextHelper.cpp

@@ -14,6 +14,7 @@ namespace layers {
 
 StackingContextHelper::StackingContextHelper()
   : mBuilder(nullptr)
+  , mHasPerspectiveTransform(false)
   , mXScale(1.0f)
   , mYScale(1.0f)
 {
@@ -26,6 +27,7 @@ StackingContextHelper::StackingContextHelper(const StackingContextHelper& aParen
                                              const Maybe<gfx::Matrix4x4>& aTransform,
                                              const nsTArray<wr::WrFilterOp>& aFilters)
   : mBuilder(&aBuilder)
+  , mHasPerspectiveTransform(false)
   , mXScale(1.0f)
   , mYScale(1.0f)
 {
@@ -51,6 +53,7 @@ StackingContextHelper::StackingContextHelper(const StackingContextHelper& aParen
                                              gfx::Matrix4x4* aTransformPtr,
                                              const nsTArray<wr::WrFilterOp>& aFilters)
   : mBuilder(&aBuilder)
+  , mHasPerspectiveTransform(false)
   , mXScale(1.0f)
   , mYScale(1.0f)
 {
@@ -83,6 +86,7 @@ StackingContextHelper::StackingContextHelper(const StackingContextHelper& aParen
                                              const nsTArray<wr::WrFilterOp>& aFilters,
                                              const gfx::CompositionOp& aMixBlendMode)
   : mBuilder(&aBuilder)
+  , mHasPerspectiveTransform(false)
   , mXScale(1.0f)
   , mYScale(1.0f)
 {
@@ -92,6 +96,10 @@ StackingContextHelper::StackingContextHelper(const StackingContextHelper& aParen
     mTransform = *aTransformPtr;
   }
 
+  if (aPerspectivePtr) {
+    mHasPerspectiveTransform = true;
+  }
+
   bool is2d = !aTransformPtr || (aTransformPtr->Is2D() && !aPerspectivePtr);
   if (is2d) {
     nsRect itemBounds = aDisplayList->GetClippedBoundsWithRespectToASR(aDisplayListBuilder, aItem->GetActiveScrolledRoot());

gfx/layers/wr/StackingContextHelper.h

@@ -96,12 +96,13 @@ public:
   }
 
   bool IsBackfaceVisible() const { return mTransform.IsBackfaceVisible(); }
+  bool HasPerspectiveTransform() const { return mHasPerspectiveTransform; }
 
 private:
   wr::DisplayListBuilder* mBuilder;
   LayerPoint mOrigin;
   gfx::Matrix4x4 mTransform;
-
+  bool mHasPerspectiveTransform;
   float mXScale;
   float mYScale;
 };

layout/painting/nsDisplayList.cpp

@@ -7841,6 +7841,7 @@ nsDisplayTransform::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder& aBu
         TransformData& transformData = animation.data().get_TransformData();
         transformData.inheritedXScale() = scale.width;
         transformData.inheritedYScale() = scale.height;
+        transformData.hasPerspectiveParent() = aSc.HasPerspectiveTransform();
       }
     }