GeometryMapper: Support computing visual rects in spaces that are not direct ancestors.

third_party/WebKit/Source/core/paint/ObjectPaintProperties.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 ObjectPaintProperties_h
 #define ObjectPaintProperties_h
 
+#include "core/CoreExport.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
 #include "platform/graphics/paint/EffectPaintPropertyNode.h"
 #include "platform/graphics/paint/PaintChunkProperties.h"
+#include "platform/graphics/paint/PropertyTreeState.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/RefPtr.h"
 #include <memory>
 
 namespace blink {
 
 // This class stores property tree related information associated with a LayoutObject.
 // Currently there are two groups of information:
 // 1. The set of property nodes created locally by this LayoutObject.
 // 2. [Optional] A suite of property nodes (PaintChunkProperties) and paint offset
 //    that can be used to paint the border box of this LayoutObject.
-class ObjectPaintProperties {
+class CORE_EXPORT ObjectPaintProperties {
     WTF_MAKE_NONCOPYABLE(ObjectPaintProperties);
     USING_FAST_MALLOC(ObjectPaintProperties);
 public:
     struct LocalBorderBoxProperties;
 
     static std::unique_ptr<ObjectPaintProperties> create()
     {
         return wrapUnique(new ObjectPaintProperties());
     }
 
-    // The hierarchy of transform subtree created by a LayoutObject.
+    // The hierarchy of the transform subtree created by a LayoutObject is as follows:
     // [ paintOffsetTranslation ]           Normally paint offset is accumulated without creating a node
     // |                                    until we see, for example, transform or position:fixed.
     // +---[ transform ]                    The space created by CSS transform.
     //     |                                This is the local border box space, see: LocalBorderBoxProperties below.
     //     +---[ perspective ]              The space created by CSS perspective.
     //     |   +---[ svgLocalToBorderBoxTransform ] Additional transform for children of the outermost root SVG.
     //     |              OR                (SVG does not support scrolling.)
     //     |   +---[ scrollTranslation ]    The space created by overflow clip.
     //     +---[ scrollbarPaintOffset ]     TODO(trchen): Remove this once we bake the paint offset into frameRect.
     //                                      This is equivalent to the local border box space above,
     //                                      with pixel snapped paint offset baked in. It is really redundant,
     //                                      but it is a pain to teach scrollbars to paint with an offset.
     TransformPaintPropertyNode* paintOffsetTranslation() const { return m_paintOffsetTranslation.get(); }
     TransformPaintPropertyNode* transform() const { return m_transform.get(); }
     TransformPaintPropertyNode* perspective() const { return m_perspective.get(); }
     TransformPaintPropertyNode* svgLocalToBorderBoxTransform() const { return m_svgLocalToBorderBoxTransform.get(); }
     TransformPaintPropertyNode* scrollTranslation() const { return m_scrollTranslation.get(); }
     TransformPaintPropertyNode* scrollbarPaintOffset() const { return m_scrollbarPaintOffset.get(); }
 
     EffectPaintPropertyNode* effect() const { return m_effect.get(); }
 
+    // The hierarchy of the clip subtree created by a LayoutObject is as follows:
+    // [ css clip ]
+    // |
+    // +--- [ overflow clip ]
     ClipPaintPropertyNode* cssClip() const { return m_cssClip.get(); }
     ClipPaintPropertyNode* cssClipFixedPosition() const { return m_cssClipFixedPosition.get(); }
     ClipPaintPropertyNode* overflowClip() const { return m_overflowClip.get(); }
 
     // This is a complete set of property nodes that should be used as a starting point to paint
     // this layout object. It is needed becauase some property inherits from the containing block,
     // not painting parent, thus can't be derived in O(1) during paint walk.
     // Note: If this layout object has transform or stacking-context effects, those are already
     // baked into in the context here. However for properties that affects only children,
     // for example, perspective and overflow clip, those should be applied by the painter
     // at the right painting step.
     struct LocalBorderBoxProperties {
         LayoutPoint paintOffset;
-        RefPtr<TransformPaintPropertyNode> transform;
-        RefPtr<ClipPaintPropertyNode> clip;
-        RefPtr<EffectPaintPropertyNode> effect;
+        PropertyTreeState propertyTreeState;
     };
     LocalBorderBoxProperties* localBorderBoxProperties() const { return m_localBorderBoxProperties.get(); }
 
 private:
     ObjectPaintProperties() { }
 
     friend class PaintPropertyTreeBuilder;
     // These setters should only be used by PaintPropertyTreeBuilder.
     void setPaintOffsetTranslation(PassRefPtr<TransformPaintPropertyNode> paintOffset) { m_paintOffsetTranslation = paintOffset; }
     void setTransform(PassRefPtr<TransformPaintPropertyNode> transform) { m_transform = transform; }
@@ skipping 26 matching lines @@
     RefPtr<TransformPaintPropertyNode> m_svgLocalToBorderBoxTransform;
     RefPtr<TransformPaintPropertyNode> m_scrollTranslation;
     RefPtr<TransformPaintPropertyNode> m_scrollbarPaintOffset;
 
     std::unique_ptr<LocalBorderBoxProperties> m_localBorderBoxProperties;
 };
 
 } // namespace blink
 
 #endif // ObjectPaintProperties_h