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
32 namespace WebCore {
33
translate(int x,int y,TransformAccumulation accumulate)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
applyTransform(const TransformationMatrix & transformFromContainer,TransformAccumulation accumulate)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
flatten()52 void HitTestingTransformState::flatten()
53 {
54 flattenWithTransform(m_accumulatedTransform);
55 }
56
flattenWithTransform(const TransformationMatrix & t)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
mappedPoint() const68 FloatPoint HitTestingTransformState::mappedPoint() const
69 {
70 return m_accumulatedTransform.inverse().projectPoint(m_lastPlanarPoint);
71 }
72
mappedQuad() const73 FloatQuad HitTestingTransformState::mappedQuad() const
74 {
75 return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarQuad);
76 }
77
mappedArea() const78 FloatQuad HitTestingTransformState::mappedArea() const
79 {
80 return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarArea);
81 }
82
boundsOfMappedArea() const83 LayoutRect HitTestingTransformState::boundsOfMappedArea() const
84 {
85 return m_accumulatedTransform.inverse().clampedBoundsOfProjectedQuad(m_lastPlanarArea);
86 }
87
88 } // namespace WebCore
89