[SPv2] Add filter support in PaintArtifactCompositor

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h

 // Copyright 2015 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.
 
 #ifndef PaintPropertyTreeBuilder_h
 #define PaintPropertyTreeBuilder_h
 
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
 #include "platform/graphics/paint/EffectPaintPropertyNode.h"
@@ skipping 52 matching lines @@
   ContainingBlockContext absolutePosition;
   const LayoutObject* containerForAbsolutePosition = nullptr;
 
   ContainingBlockContext fixedPosition;
 
   // The effect hierarchy is applied by the stacking context tree. It is
   // guaranteed that every DOM descendant is also a stacking context descendant.
   // Therefore, we don't need extra bookkeeping for effect nodes and can
   // generate the effect tree from a DOM-order traversal.
   const EffectPaintPropertyNode* currentEffect = nullptr;
+  // Some effects are spatial, i.e. may refer to input pixels outside of output
+  // clip. The cull rect for its input shall be derived from its output clip.
+  // This variable represents the input cull of current effect, also serves as
+  // output clip of child effects that don't have a hard clip.
+  const ClipPaintPropertyNode* inputClipOfCurrentEffect = nullptr;
 
   bool isUnderMultiColumnSpanner = false;
 };
 
 // Creates paint property tree nodes for special things in the layout tree.
 // Special things include but not limit to: overflow clip, transform, fixed-pos,
 // animation, mask, filter, ... etc.
 // It expects to be invoked for each layout tree node in DOM order during
 // InPrePaint phase.
 class PaintPropertyTreeBuilder {
@@ skipping 38 matching lines @@
   static void updateScrollAndScrollTranslation(
       const LayoutObject&,
       PaintPropertyTreeBuilderContext&);
   static void updateOutOfFlowContext(const LayoutObject&,
                                      PaintPropertyTreeBuilderContext&);
 };
 
 }  // namespace blink
 
 #endif  // PaintPropertyTreeBuilder_h