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

   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/layout/HitTestingTransformState.h"
  28
  29 #include "platform/geometry/LayoutRect.h"
  30 #include "wtf/PassOwnPtr.h"
  31
  32 namespace blink {
  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 blink