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
32namespace blink {
33
34void 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
43void 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
52void HitTestingTransformState::flatten()
53{
54    flattenWithTransform(m_accumulatedTransform);
55}
56
57void 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
68FloatPoint HitTestingTransformState::mappedPoint() const
69{
70    return m_accumulatedTransform.inverse().projectPoint(m_lastPlanarPoint);
71}
72
73FloatQuad HitTestingTransformState::mappedQuad() const
74{
75    return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarQuad);
76}
77
78FloatQuad HitTestingTransformState::mappedArea() const
79{
80    return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarArea);
81}
82
83LayoutRect HitTestingTransformState::boundsOfMappedArea() const
84{
85    return m_accumulatedTransform.inverse().clampedBoundsOfProjectedQuad(m_lastPlanarArea);
86}
87
88} // namespace blink
89