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author | Feng Qian <> | 2009-04-10 18:11:29 -0700 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-04-10 18:11:29 -0700 |
commit | 8f72e70a9fd78eec56623b3a62e68f16b7b27e28 (patch) | |
tree | 181bf9a400c30a1bf34ea6d72560e8d00111d549 /WebCore/rendering/TransformState.cpp | |
parent | 7ed56f225e0ade046e1c2178977f72b2d896f196 (diff) | |
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AI 145796: Land the WebKit merge @r42026.
Automated import of CL 145796
Diffstat (limited to 'WebCore/rendering/TransformState.cpp')
-rw-r--r-- | WebCore/rendering/TransformState.cpp | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/WebCore/rendering/TransformState.cpp b/WebCore/rendering/TransformState.cpp new file mode 100644 index 0000000..5021d1f --- /dev/null +++ b/WebCore/rendering/TransformState.cpp @@ -0,0 +1,162 @@ +/* + * Copyright (C) 2009 Apple Inc. 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. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * 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 "config.h" +#include "TransformState.h" + +namespace WebCore { + +void TransformState::move(int x, int y, bool accumulateTransform) +{ + if (m_accumulatingTransform && m_accumulatedTransform) { + // If we're accumulating into an existing transform, apply the translation. + if (m_direction == ApplyTransformDirection) + m_accumulatedTransform->translateRight(x, y); + else + m_accumulatedTransform->translate(-x, -y); // We're unapplying, so negate + + // Then flatten if necessary. + if (!accumulateTransform) + flatten(); + } else { + // Just move the point and, optionally, the quad. + m_lastPlanarPoint.move(x, y); + if (m_mapQuad) + m_lastPlanarQuad.move(x, y); + } + m_accumulatingTransform = accumulateTransform; +} + +void TransformState::applyTransform(const TransformationMatrix& transformFromContainer, bool accumulateTransform) +{ + // If we have an accumulated transform from last time, multiply in this transform + if (m_accumulatedTransform) { + if (m_direction == ApplyTransformDirection) + m_accumulatedTransform->multiply(transformFromContainer); + else + m_accumulatedTransform->multLeft(transformFromContainer); + } else if (accumulateTransform) { + // Make one if we started to accumulate + m_accumulatedTransform.set(new TransformationMatrix(transformFromContainer)); + } + + if (!accumulateTransform) { + const TransformationMatrix* finalTransform = m_accumulatedTransform ? m_accumulatedTransform.get() : &transformFromContainer; + flattenWithTransform(*finalTransform); + } + m_accumulatingTransform = accumulateTransform; +} + +void TransformState::flatten() +{ + if (!m_accumulatedTransform) { + m_accumulatingTransform = false; + return; + } + + flattenWithTransform(*m_accumulatedTransform); +} + +FloatPoint TransformState::mappedPoint() const +{ + if (!m_accumulatedTransform) + return m_lastPlanarPoint; + + if (m_direction == ApplyTransformDirection) + return m_accumulatedTransform->mapPoint(m_lastPlanarPoint); + + return m_accumulatedTransform->inverse().projectPoint(m_lastPlanarPoint); +} + +FloatQuad TransformState::mappedQuad() const +{ + if (!m_accumulatedTransform) + return m_lastPlanarQuad; + + if (m_direction == ApplyTransformDirection) + return m_accumulatedTransform->mapQuad(m_lastPlanarQuad); + + return m_accumulatedTransform->inverse().projectQuad(m_lastPlanarQuad); +} + +void TransformState::flattenWithTransform(const TransformationMatrix& t) +{ + if (m_direction == ApplyTransformDirection) { + m_lastPlanarPoint = t.mapPoint(m_lastPlanarPoint); + if (m_mapQuad) + m_lastPlanarQuad = t.mapQuad(m_lastPlanarQuad); + } else { + TransformationMatrix inverseTransform = t.inverse(); + m_lastPlanarPoint = inverseTransform.projectPoint(m_lastPlanarPoint); + if (m_mapQuad) + m_lastPlanarQuad = inverseTransform.projectQuad(m_lastPlanarQuad); + } + + // We could throw away m_accumulatedTransform if we wanted to here, but that + // would cause thrash when traversing hierarachies with alternating + // preserve-3d and flat elements. + if (m_accumulatedTransform) + m_accumulatedTransform->makeIdentity(); + m_accumulatingTransform = false; +} + +// HitTestingTransformState methods +void HitTestingTransformState::move(int x, int y) +{ + if (m_accumulatingTransform) + flatten(); + + m_lastPlanarPoint.move(x, y); + m_lastPlanarQuad.move(x, y); +} + +void HitTestingTransformState::applyTransform(const TransformationMatrix& transformFromContainer, bool accumulateTransform) +{ + m_accumulatedTransform.multLeft(transformFromContainer); + if (!accumulateTransform) + flatten(); + + m_accumulatingTransform = accumulateTransform; +} + +void HitTestingTransformState::flatten() +{ + m_lastPlanarPoint = mappedPoint(); + m_lastPlanarQuad = mappedQuad(); + m_accumulatedTransform.makeIdentity(); + m_accumulatingTransform = false; +} + +FloatPoint HitTestingTransformState::mappedPoint() const +{ + return m_accumulatedTransform.inverse().projectPoint(m_lastPlanarPoint); +} + +FloatQuad HitTestingTransformState::mappedQuad() const +{ + return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarQuad); +} + +} // namespace WebCore |