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Viewing changes to src/3rdparty/webkit/WebCore/rendering/TransformState.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Alessandro Ghersi
  • Date: 2009-11-02 18:30:08 UTC
  • mfrom: (1.2.2 upstream)
  • mto: (15.2.5 experimental)
  • mto: This revision was merged to the branch mainline in revision 88.
  • Revision ID: james.westby@ubuntu.com-20091102183008-b6a4gcs128mvfb3m
Tags: upstream-4.6.0~beta1
Import upstream version 4.6.0~beta1

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src/3rdparty/webkit/WebCore/rendering/TransformState.cpp
 
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/*
 
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 * Copyright (C) 2009 Apple Inc.  All rights reserved.
 
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 *
 
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 * Redistribution and use in source and binary forms, with or without
 
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 * modification, are permitted provided that the following conditions
 
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 * are met:
 
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 * 1. Redistributions of source code must retain the above copyright
 
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 *    notice, this list of conditions and the following disclaimer.
 
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 * 2. Redistributions in binary form must reproduce the above copyright
 
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 *    notice, this list of conditions and the following disclaimer in the
 
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 *    documentation and/or other materials provided with the distribution.
 
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 *
 
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 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 
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 */
 
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#include "config.h"
 
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#include "TransformState.h"
 
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namespace WebCore {
 
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void TransformState::move(int x, int y, TransformAccumulation accumulate)
 
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{
 
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    if (m_accumulatingTransform && m_accumulatedTransform) {
 
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        // If we're accumulating into an existing transform, apply the translation.
 
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        if (m_direction == ApplyTransformDirection)
 
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            m_accumulatedTransform->translateRight(x, y);
 
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        else
 
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            m_accumulatedTransform->translate(-x, -y);  // We're unapplying, so negate
 
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        // Then flatten if necessary.
 
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        if (accumulate == FlattenTransform)
 
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            flatten();
 
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    } else {
 
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        // Just move the point and, optionally, the quad.
 
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        m_lastPlanarPoint.move(x, y);
 
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        if (m_mapQuad)
 
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            m_lastPlanarQuad.move(x, y);
 
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    }
 
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    m_accumulatingTransform = accumulate == AccumulateTransform;
 
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}
 
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void TransformState::applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation accumulate)
 
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{
 
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    // If we have an accumulated transform from last time, multiply in this transform
 
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    if (m_accumulatedTransform) {
 
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        if (m_direction == ApplyTransformDirection)
 
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            m_accumulatedTransform->multiply(transformFromContainer);
 
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        else
 
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            m_accumulatedTransform->multLeft(transformFromContainer);
 
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    } else if (accumulate == AccumulateTransform) {
 
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        // Make one if we started to accumulate
 
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        m_accumulatedTransform.set(new TransformationMatrix(transformFromContainer));
 
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    }
 
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    if (accumulate == FlattenTransform) {
 
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        const TransformationMatrix* finalTransform = m_accumulatedTransform ? m_accumulatedTransform.get() : &transformFromContainer;
 
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        flattenWithTransform(*finalTransform);
 
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    }
 
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    m_accumulatingTransform = accumulate == AccumulateTransform;
 
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}
 
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void TransformState::flatten()
 
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{
 
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    if (!m_accumulatedTransform) {
 
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        m_accumulatingTransform = false;
 
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        return;
 
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    }
 
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    flattenWithTransform(*m_accumulatedTransform);
 
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}
 
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FloatPoint TransformState::mappedPoint() const
 
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{
 
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    if (!m_accumulatedTransform)
 
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        return m_lastPlanarPoint;
 
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    if (m_direction == ApplyTransformDirection)
 
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        return m_accumulatedTransform->mapPoint(m_lastPlanarPoint);
 
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    return m_accumulatedTransform->inverse().projectPoint(m_lastPlanarPoint);
 
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}
 
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FloatQuad TransformState::mappedQuad() const
 
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{
 
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    if (!m_accumulatedTransform)
 
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        return m_lastPlanarQuad;
 
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    if (m_direction == ApplyTransformDirection)
 
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        return m_accumulatedTransform->mapQuad(m_lastPlanarQuad);
 
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    return m_accumulatedTransform->inverse().projectQuad(m_lastPlanarQuad);
 
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}
 
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void TransformState::flattenWithTransform(const TransformationMatrix& t)
 
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{
 
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    if (m_direction == ApplyTransformDirection) {
 
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        m_lastPlanarPoint = t.mapPoint(m_lastPlanarPoint);
 
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        if (m_mapQuad)
 
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            m_lastPlanarQuad = t.mapQuad(m_lastPlanarQuad);
 
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    } else {
 
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        TransformationMatrix inverseTransform = t.inverse();
 
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        m_lastPlanarPoint = inverseTransform.projectPoint(m_lastPlanarPoint);
 
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        if (m_mapQuad)
 
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            m_lastPlanarQuad = inverseTransform.projectQuad(m_lastPlanarQuad);
 
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    }
 
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    // We could throw away m_accumulatedTransform if we wanted to here, but that
 
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    // would cause thrash when traversing hierarachies with alternating
 
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    // preserve-3d and flat elements.
 
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    if (m_accumulatedTransform)
 
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        m_accumulatedTransform->makeIdentity();
 
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    m_accumulatingTransform = false;
 
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}
 
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// HitTestingTransformState methods
 
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void HitTestingTransformState::translate(int x, int y, TransformAccumulation accumulate)
 
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{
 
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    m_accumulatedTransform.translate(x, y);    
 
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    if (accumulate == FlattenTransform)
 
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        flattenWithTransform(m_accumulatedTransform);
 
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    m_accumulatingTransform = accumulate == AccumulateTransform;
 
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}
 
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void HitTestingTransformState::applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation accumulate)
 
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{
 
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    m_accumulatedTransform.multLeft(transformFromContainer);    
 
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    if (accumulate == FlattenTransform)
 
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        flattenWithTransform(m_accumulatedTransform);
 
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    m_accumulatingTransform = accumulate == AccumulateTransform;
 
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}
 
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void HitTestingTransformState::flatten()
 
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{
 
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    flattenWithTransform(m_accumulatedTransform);
 
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}
 
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void HitTestingTransformState::flattenWithTransform(const TransformationMatrix& t)
 
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{
 
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    TransformationMatrix inverseTransform = t.inverse();
 
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    m_lastPlanarPoint = inverseTransform.projectPoint(m_lastPlanarPoint);
 
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    m_lastPlanarQuad = inverseTransform.projectQuad(m_lastPlanarQuad);
 
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    m_accumulatedTransform.makeIdentity();
 
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    m_accumulatingTransform = false;
 
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}
 
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FloatPoint HitTestingTransformState::mappedPoint() const
 
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{
 
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    return m_accumulatedTransform.inverse().projectPoint(m_lastPlanarPoint);
 
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}
 
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FloatQuad HitTestingTransformState::mappedQuad() const
 
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{
 
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    return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarQuad);
 
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}
 
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} // namespace WebCore