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#ifndef HitTestingTransformState_h
27#define HitTestingTransformState_h
28
29#include "platform/geometry/FloatQuad.h"
30#include "platform/geometry/FloatPoint.h"
31#include "platform/geometry/IntSize.h"
32#include "platform/transforms/AffineTransform.h"
33#include "platform/transforms/TransformationMatrix.h"
34#include "wtf/PassRefPtr.h"
35#include "wtf/RefCounted.h"
36
37namespace blink {
38
39// FIXME: Now that TransformState lazily creates its TransformationMatrix it takes up less space.
40// So there's really no need for a ref counted version. So This class should be removed and replaced
41// with TransformState. There are some minor differences (like the way translate() works slightly
42// differently than move()) so care has to be taken when this is done.
43class HitTestingTransformState : public RefCounted<HitTestingTransformState> {
44public:
45    static PassRefPtr<HitTestingTransformState> create(const FloatPoint& p, const FloatQuad& quad, const FloatQuad& area)
46    {
47        return adoptRef(new HitTestingTransformState(p, quad, area));
48    }
49
50    static PassRefPtr<HitTestingTransformState> create(const HitTestingTransformState& other)
51    {
52        return adoptRef(new HitTestingTransformState(other));
53    }
54
55    enum TransformAccumulation { FlattenTransform, AccumulateTransform };
56    void translate(int x, int y, TransformAccumulation);
57    void applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation);
58
59    FloatPoint mappedPoint() const;
60    FloatQuad mappedQuad() const;
61    FloatQuad mappedArea() const;
62    LayoutRect boundsOfMappedArea() const;
63    void flatten();
64
65    FloatPoint m_lastPlanarPoint;
66    FloatQuad m_lastPlanarQuad;
67    FloatQuad m_lastPlanarArea;
68    TransformationMatrix m_accumulatedTransform;
69    bool m_accumulatingTransform;
70
71private:
72    HitTestingTransformState(const FloatPoint& p, const FloatQuad& quad, const FloatQuad& area)
73        : m_lastPlanarPoint(p)
74        , m_lastPlanarQuad(quad)
75        , m_lastPlanarArea(area)
76        , m_accumulatingTransform(false)
77    {
78    }
79
80    HitTestingTransformState(const HitTestingTransformState& other)
81        : RefCounted<HitTestingTransformState>()
82        , m_lastPlanarPoint(other.m_lastPlanarPoint)
83        , m_lastPlanarQuad(other.m_lastPlanarQuad)
84        , m_lastPlanarArea(other.m_lastPlanarArea)
85        , m_accumulatedTransform(other.m_accumulatedTransform)
86        , m_accumulatingTransform(other.m_accumulatingTransform)
87    {
88    }
89
90    void flattenWithTransform(const TransformationMatrix&);
91};
92
93} // namespace blink
94
95#endif // HitTestingTransformState_h
96