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      1 /*
      2  * Copyright (C) 2011 Apple Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/rendering/HitTestingTransformState.h"
     28 
     29 #include "platform/geometry/LayoutRect.h"
     30 #include "wtf/PassOwnPtr.h"
     31 
     32 namespace WebCore {
     33 
     34 void HitTestingTransformState::translate(int x, int y, TransformAccumulation accumulate)
     35 {
     36     m_accumulatedTransform.translate(x, y);
     37     if (accumulate == FlattenTransform)
     38         flattenWithTransform(m_accumulatedTransform);
     39 
     40     m_accumulatingTransform = accumulate == AccumulateTransform;
     41 }
     42 
     43 void HitTestingTransformState::applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation accumulate)
     44 {
     45     m_accumulatedTransform.multiply(transformFromContainer);
     46     if (accumulate == FlattenTransform)
     47         flattenWithTransform(m_accumulatedTransform);
     48 
     49     m_accumulatingTransform = accumulate == AccumulateTransform;
     50 }
     51 
     52 void HitTestingTransformState::flatten()
     53 {
     54     flattenWithTransform(m_accumulatedTransform);
     55 }
     56 
     57 void HitTestingTransformState::flattenWithTransform(const TransformationMatrix& t)
     58 {
     59     TransformationMatrix inverseTransform = t.inverse();
     60     m_lastPlanarPoint = inverseTransform.projectPoint(m_lastPlanarPoint);
     61     m_lastPlanarQuad = inverseTransform.projectQuad(m_lastPlanarQuad);
     62     m_lastPlanarArea = inverseTransform.projectQuad(m_lastPlanarArea);
     63 
     64     m_accumulatedTransform.makeIdentity();
     65     m_accumulatingTransform = false;
     66 }
     67 
     68 FloatPoint HitTestingTransformState::mappedPoint() const
     69 {
     70     return m_accumulatedTransform.inverse().projectPoint(m_lastPlanarPoint);
     71 }
     72 
     73 FloatQuad HitTestingTransformState::mappedQuad() const
     74 {
     75     return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarQuad);
     76 }
     77 
     78 FloatQuad HitTestingTransformState::mappedArea() const
     79 {
     80     return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarArea);
     81 }
     82 
     83 LayoutRect HitTestingTransformState::boundsOfMappedArea() const
     84 {
     85     return m_accumulatedTransform.inverse().clampedBoundsOfProjectedQuad(m_lastPlanarArea);
     86 }
     87 
     88 } // namespace WebCore
     89