Simplify and add caching for accessible bounding box calculation.

Source/core/accessibility/AccessibilityObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 407 matching lines @@
     virtual const AtomicString& accessKey() const { return nullAtom; }
     virtual int blockquoteLevel() const;
     virtual bool canvasHasFallbackContent() const { return false; }
     virtual AccessibilityObject* correspondingControlForLabelElement() const { return 0; }
     virtual AccessibilityObject* correspondingLabelForControlElement() const { return 0; }
     virtual bool exposesTitleUIElement() const { return true; }
     virtual int headingLevel() const { return 0; }
     // 1-based, to match the aria-level spec.
     virtual unsigned hierarchicalLevel() const { return 0; }
     virtual void linkedUIElements(AccessibilityChildrenVector&) const { }
-    virtual AccessibilityOrientation orientation() const;
+    virtual AccessibilityOrientation orientation();
     virtual void tabChildren(AccessibilityChildrenVector&) { }
     virtual int tableLevel() const { return 0; }
     virtual String text() const { return String(); }
     virtual int textLength() const { return 0; }
     virtual AccessibilityObject* titleUIElement() const { return 0; }
     virtual KURL url() const { return KURL(); }
     virtual void visibleChildren(AccessibilityChildrenVector&) { }
 
     // Properties of interactive elements.
     virtual const String& actionVerb() const;
@@ skipping 57 matching lines @@
 
     // Accessibility Text.
     virtual void accessibilityText(Vector<AccessibilityText>&) { };
     virtual String textUnderElement() const { return String(); }
 
     // Accessibility Text - (To be deprecated).
     virtual String accessibilityDescription() const { return String(); }
     virtual String title() const { return String(); }
     virtual String helpText() const { return String(); }
 
-    // Position and size.
-    virtual LayoutRect boundingBoxRect() const { return LayoutRect(); }
-    IntRect pixelSnappedBoundingBoxRect() const { return pixelSnappedIntRect(boundingBoxRect()); }
-    virtual LayoutRect elementRect() const = 0;
-    IntRect pixelSnappedElementRect() const { return pixelSnappedIntRect(elementRect()); }
-    LayoutSize size() const { return elementRect().size(); }
-    IntSize pixelSnappedSize() const { return elementRect().pixelSnappedSize(); }
+    // Location and click point in frame-relative coordinates.
+    virtual LayoutRect elementRect() { return LayoutRect(); }
+    virtual void updateCachedElementRect() { }
+    virtual void markCachedElementRectDirty();
     virtual IntPoint clickPoint();
-    static IntRect boundingBoxForQuads(RenderObject*, const Vector<FloatQuad>&);
 
     // Hit testing.
     // Called on the root AX object to return the deepest available element.
     virtual AccessibilityObject* accessibilityHitTest(const IntPoint&) const { return 0; }
     // Called on the AX object after the render tree determines which is the right AccessibilityRenderObject.
-    virtual AccessibilityObject* elementAccessibilityHitTest(const IntPoint&) const;
+    virtual AccessibilityObject* elementAccessibilityHitTest(const IntPoint&);
 
     // High-level accessibility tree access. Other modules should only use these functions.
     const AccessibilityChildrenVector& children();
     virtual AccessibilityObject* parentObject() const = 0;
     virtual AccessibilityObject* parentObjectUnignored() const;
     virtual AccessibilityObject* parentObjectIfExists() const { return 0; }
 
     // Low-level accessibility tree exploration, only for use within the accessibility module.
     virtual AccessibilityObject* firstChild() const { return 0; }
     virtual AccessibilityObject* lastChild() const { return 0; }
@@ skipping 39 matching lines @@
     virtual VisibleSelection selection() const { return VisibleSelection(); }
     virtual String selectedText() const { return String(); }
 
     // Modify or take an action on an object.
     virtual void increment() { }
     virtual void decrement() { }
     virtual void makeRangeVisible(const PlainTextRange&) { }
     virtual bool performDefaultAction() const { return press(); }
     virtual bool press() const;
     // Make this object visible by scrolling as many nested scrollable views as needed.
-    virtual void scrollToMakeVisible() const;
+    virtual void scrollToMakeVisible();
     // Same, but if the whole object can't be made visible, try for this subrect, in local coordinates.
-    virtual void scrollToMakeVisibleWithSubFocus(const IntRect&) const;
+    virtual void scrollToMakeVisibleWithSubFocus(const IntRect&);
     // Scroll this object to a given point in global coordinates of the top-level window.
-    virtual void scrollToGlobalPoint(const IntPoint&) const;
+    virtual void scrollToGlobalPoint(const IntPoint&);
     virtual void setAccessibleName(const AtomicString&) { }
     virtual void setFocused(bool) { }
     virtual void setSelected(bool) { }
     virtual void setSelectedRows(AccessibilityChildrenVector&) { }
     virtual void setSelectedText(const String&) { }
     virtual void setSelectedTextRange(const PlainTextRange&) { }
     virtual void setValue(const String&) { }
     virtual void setValue(float) { }
 
     // Notifications that this object may have changed.
@@ skipping 72 matching lines @@
     // Fenced components.
     virtual String mathFencedOpenString() const { return String(); }
     virtual String mathFencedCloseString() const { return String(); }
     virtual int mathLineThickness() const { return 0; }
 
     // Static helper functions.
     static bool isARIAControl(AccessibilityRole);
     static bool isARIAInput(AccessibilityRole);
     static AccessibilityObject* anchorElementForNode(Node*);
     static AccessibilityRole ariaRoleToWebCoreRole(const String&);
+    static IntRect boundingBoxForQuads(RenderObject*, const Vector<FloatQuad>&);
 
 protected:
     AXID m_id;
     AccessibilityChildrenVector m_children;
     mutable bool m_haveChildren;
     AccessibilityRole m_role;
     AccessibilityObjectInclusion m_lastKnownIsIgnoredValue;
 
     virtual bool computeAccessibilityIsIgnored() const { return true; }
 
@@ skipping 13 matching lines @@
 #if !HAVE(ACCESSIBILITY)
 inline const AccessibilityObject::AccessibilityChildrenVector& AccessibilityObject::children() { return m_children; }
 inline const String& AccessibilityObject::actionVerb() const { return emptyString(); }
 inline int AccessibilityObject::lineForPosition(const VisiblePosition&) const { return -1; }
 inline void AccessibilityObject::updateBackingStore() { }
 #endif
 
 } // namespace WebCore
 
 #endif // AccessibilityObject_h