code.vuplus.com Git - vuplus_webkit/blob - Source/WebCore/platform/graphics/transforms/TransformState.cpp

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  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
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  25
  26 #include "config.h"
  27 #include "TransformState.h"
  28
  29 #include <wtf/PassOwnPtr.h>
  30
  31 namespace WebCore {
  32
  33 TransformState& TransformState::operator=(const TransformState& other)
  34 {
  35     m_mapPoint = other.m_mapPoint;
  36     m_mapQuad = other.m_mapQuad;
  37     if (m_mapPoint)
  38         m_lastPlanarPoint = other.m_lastPlanarPoint;
  39     if (m_mapQuad)
  40         m_lastPlanarQuad = other.m_lastPlanarQuad;
  41     m_accumulatingTransform = other.m_accumulatingTransform;
  42     m_direction = other.m_direction;
  43
  44     m_accumulatedTransform.clear();
  45
  46     if (other.m_accumulatedTransform)
  47         m_accumulatedTransform = adoptPtr(new TransformationMatrix(*other.m_accumulatedTransform));
  48
  49     return *this;
  50 }
  51
  52 void TransformState::move(int x, int y, TransformAccumulation accumulate)
  53 {
  54     if (m_accumulatingTransform && m_accumulatedTransform) {
  55         // If we're accumulating into an existing transform, apply the translation.
  56         if (m_direction == ApplyTransformDirection)
  57             m_accumulatedTransform->translateRight(x, y);
  58         else
  59             m_accumulatedTransform->translate(x, y);
  60
  61         // Then flatten if necessary.
  62         if (accumulate == FlattenTransform)
  63             flatten();
  64     } else {
  65         // Just move the point and, optionally, the quad.
  66         if (m_direction == UnapplyInverseTransformDirection) {
  67             x = -x;
  68             y = -y;
  69         }
  70         if (m_mapPoint)
  71             m_lastPlanarPoint.move(x, y);
  72         if (m_mapQuad)
  73             m_lastPlanarQuad.move(x, y);
  74     }
  75     m_accumulatingTransform = accumulate == AccumulateTransform;
  76 }
  77
  78 // FIXME: We transform AffineTransform to TransformationMatrix. This is rather inefficient.
  79 void TransformState::applyTransform(const AffineTransform& transformFromContainer, TransformAccumulation accumulate)
  80 {
  81     applyTransform(transformFromContainer.toTransformationMatrix(), accumulate);
  82 }
  83
  84 void TransformState::applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation accumulate)
  85 {
  86     // If we have an accumulated transform from last time, multiply in this transform
  87     if (m_accumulatedTransform) {
  88         if (m_direction == ApplyTransformDirection)
  89             m_accumulatedTransform = adoptPtr(new TransformationMatrix(transformFromContainer * *m_accumulatedTransform));
  90         else
  91             m_accumulatedTransform->multiply(transformFromContainer);
  92     } else if (accumulate == AccumulateTransform) {
  93         // Make one if we started to accumulate
  94         m_accumulatedTransform = adoptPtr(new TransformationMatrix(transformFromContainer));
  95     }
  96
  97     if (accumulate == FlattenTransform) {
  98         const TransformationMatrix* finalTransform = m_accumulatedTransform ? m_accumulatedTransform.get() : &transformFromContainer;
  99         flattenWithTransform(*finalTransform);
 100     }
 101     m_accumulatingTransform = accumulate == AccumulateTransform;
 102 }
 103
 104 void TransformState::flatten()
 105 {
 106     if (!m_accumulatedTransform) {
 107         m_accumulatingTransform = false;
 108         return;
 109     }
 110
 111     flattenWithTransform(*m_accumulatedTransform);
 112 }
 113
 114 FloatPoint TransformState::mappedPoint() const
 115 {
 116     if (!m_accumulatedTransform)
 117         return m_lastPlanarPoint;
 118
 119     if (m_direction == ApplyTransformDirection)
 120         return m_accumulatedTransform->mapPoint(m_lastPlanarPoint);
 121
 122     return m_accumulatedTransform->inverse().projectPoint(m_lastPlanarPoint);
 123 }
 124
 125 FloatQuad TransformState::mappedQuad() const
 126 {
 127     if (!m_accumulatedTransform)
 128         return m_lastPlanarQuad;
 129
 130     if (m_direction == ApplyTransformDirection)
 131         return m_accumulatedTransform->mapQuad(m_lastPlanarQuad);
 132
 133     return m_accumulatedTransform->inverse().projectQuad(m_lastPlanarQuad);
 134 }
 135
 136 void TransformState::flattenWithTransform(const TransformationMatrix& t)
 137 {
 138     if (m_direction == ApplyTransformDirection) {
 139         if (m_mapPoint)
 140             m_lastPlanarPoint = t.mapPoint(m_lastPlanarPoint);
 141         if (m_mapQuad)
 142             m_lastPlanarQuad = t.mapQuad(m_lastPlanarQuad);
 143     } else {
 144         TransformationMatrix inverseTransform = t.inverse();
 145         if (m_mapPoint)
 146             m_lastPlanarPoint = inverseTransform.projectPoint(m_lastPlanarPoint);
 147         if (m_mapQuad)
 148             m_lastPlanarQuad = inverseTransform.projectQuad(m_lastPlanarQuad);
 149     }
 150
 151     // We could throw away m_accumulatedTransform if we wanted to here, but that
 152     // would cause thrash when traversing hierarchies with alternating
 153     // preserve-3d and flat elements.
 154     if (m_accumulatedTransform)
 155         m_accumulatedTransform->makeIdentity();
 156     m_accumulatingTransform = false;
 157 }
 158
 159 } // namespace WebCore