Implement accessibility support for CSS-transformed iframes.

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp

 /*
 * Copyright (C) 2008 Apple Inc. All rights reserved.
 *
 * 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.
 * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 62 matching lines @@
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGSVGElement.h"
 #include "core/svg/graphics/SVGImage.h"
 #include "modules/accessibility/AXImageMapLink.h"
 #include "modules/accessibility/AXInlineTextBox.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 #include "modules/accessibility/AXSVGRoot.h"
 #include "modules/accessibility/AXSpinButton.h"
 #include "modules/accessibility/AXTable.h"
 #include "platform/fonts/FontTraits.h"
+#include "platform/geometry/TransformState.h"
 #include "platform/text/PlatformLocale.h"
 #include "platform/text/TextDirection.h"
 #include "wtf/StdLibExtras.h"
 
 using blink::WebLocalizedString;
 
 namespace blink {
 
 using namespace HTMLNames;
 
@@ skipping 118 matching lines @@
             toAXLayoutObject(obj)->checkCachedElementRect();
     }
     for (const AXObject* obj = this; obj; obj = obj->parentObject()) {
         if (obj->isAXLayoutObject())
             toAXLayoutObject(obj)->updateCachedElementRect();
     }
 
     return m_cachedElementRect;
 }
 
+SkMatrix44 AXLayoutObject::localFrameRootTransform() const
+{
+    if (!m_layoutObject || !documentFrameView() || !documentFrameView()->layoutView())
+        return SkMatrix44();
+
+    TransformationMatrix accumulatedTransform;
+    LayoutObject* layoutObject = documentFrameView()->layoutView();
+    for (;;) {
+        LayoutObject* container = layoutObject->parent();
+        if (!container && layoutObject->frame())
+            container = layoutObject->frame()->ownerLayoutObject();
+        if (!container)
+            break;
+
+        LayoutSize offset = layoutObject->offsetFromContainer(container, LayoutPoint());
+        TransformationMatrix transformFromContainer;
+        layoutObject->getTransformFromContainer(container, offset, transformFromContainer);
+        accumulatedTransform *= transformFromContainer;
+        layoutObject = container;
+    }
+
+    return TransformationMatrix::toSkMatrix44(accumulatedTransform);
+}
+
 LayoutBoxModelObject* AXLayoutObject::layoutBoxModelObject() const
 {
     if (!m_layoutObject || !m_layoutObject->isBoxModelObject())
         return 0;
     return toLayoutBoxModelObject(m_layoutObject);
 }
 
 bool AXLayoutObject::shouldNotifyActiveDescendant() const
 {
     // We want to notify that the combo box has changed its active descendant,
@@ skipping 2315 matching lines @@
         if (label && label->layoutObject()) {
             LayoutRect labelRect = axObjectCache().getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink