Support for multiple block fragments in getClientRects().

third_party/WebKit/Source/core/layout/LayoutFlowThread.cpp

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
@@ skipping 11 matching lines @@
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 #include "core/layout/LayoutFlowThread.h"
 
+#include "core/layout/FragmentainerIterator.h"
 #include "core/layout/LayoutMultiColumnSet.h"
 
 namespace blink {
 
 LayoutFlowThread::LayoutFlowThread()
     : LayoutBlockFlow(nullptr)
     , m_columnSetsInvalidated(false)
     , m_pageLogicalSizeChanged(false)
 {
 }
@@ skipping 72 matching lines @@
 {
     computedValues.m_position = logicalTop;
     computedValues.m_extent = LayoutUnit();
 
     for (LayoutMultiColumnSetList::const_iterator iter = m_multiColumnSetList.begin(); iter != m_multiColumnSetList.end(); ++iter) {
         LayoutMultiColumnSet* columnSet = *iter;
         computedValues.m_extent += columnSet->logicalHeightInFlowThread();
     }
 }
 
+void LayoutFlowThread::absoluteQuadsForDescendant(const LayoutBox& descendant, Vector<FloatQuad>& quads)
+{
+    LayoutPoint offsetFromFlowThread;
+    for (const LayoutObject* object = &descendant; object != this;) {
+        const LayoutObject* container = object->container();
+        offsetFromFlowThread += object->offsetFromContainer(container);
+        object = container;
+    }
+    LayoutRect boundingRectInFlowThread(offsetFromFlowThread, descendant.frameRect().size());
+    // Set up a fragments relative to the descendant, in the flow thread coordinate space, and
+    // convert each of them, individually, to absolute coordinates.
+    for (FragmentainerIterator iterator(*this, boundingRectInFlowThread); !iterator.atEnd(); iterator.advance()) {
+        LayoutRect fragment = boundingRectInFlowThread;
+        // We use inclusiveIntersect() because intersect() would reset the coordinates for
+        // zero-height objects.
+        fragment.inclusiveIntersect(iterator.fragmentainerInFlowThread());
+        fragment.moveBy(-offsetFromFlowThread);
+        quads.append(descendant.localToAbsoluteQuad(FloatRect(fragment)));
+    }
+}
+
 bool LayoutFlowThread::nodeAtPoint(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
 {
     if (hitTestAction == HitTestBlockBackground)
         return false;
     return LayoutBlockFlow::nodeAtPoint(result, locationInContainer, accumulatedOffset, hitTestAction);
 }
 
 LayoutUnit LayoutFlowThread::pageLogicalHeightForOffset(LayoutUnit offset)
 {
     LayoutMultiColumnSet* columnSet = columnSetAtBlockOffset(offset, AssociateWithLatterPage);
@@ skipping 60 matching lines @@
 
 void LayoutFlowThread::MultiColumnSetSearchAdapter::collectIfNeeded(const MultiColumnSetInterval& interval)
 {
     if (m_result)
         return;
     if (interval.low() <= m_offset && interval.high() > m_offset)
         m_result = interval.data();
 }
 
 } // namespace blink