1 /*
2  * Copyright (C) 2009 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 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 PerspectiveTransformOperation_h
27 #define PerspectiveTransformOperation_h
28 
29 #include "Length.h"
30 #include "TransformOperation.h"
31 
32 namespace WebCore {
33 
34 class PerspectiveTransformOperation : public TransformOperation {
35 public:
create(const Length & p)36     static PassRefPtr<PerspectiveTransformOperation> create(const Length& p)
37     {
38         return adoptRef(new PerspectiveTransformOperation(p));
39     }
40 
perspective()41     Length perspective() const { return m_p; }
42 
43 private:
isIdentity()44     virtual bool isIdentity() const { return m_p.calcFloatValue(1) == 0; }
getOperationType()45     virtual OperationType getOperationType() const { return PERSPECTIVE; }
isSameType(const TransformOperation & o)46     virtual bool isSameType(const TransformOperation& o) const { return o.getOperationType() == PERSPECTIVE; }
47 
48     virtual bool operator==(const TransformOperation& o) const
49     {
50         if (!isSameType(o))
51             return false;
52         const PerspectiveTransformOperation* p = static_cast<const PerspectiveTransformOperation*>(&o);
53         return m_p == p->m_p;
54     }
55 
apply(TransformationMatrix & transform,const IntSize &)56     virtual bool apply(TransformationMatrix& transform, const IntSize&) const
57     {
58         transform.applyPerspective(m_p.calcFloatValue(1));
59         return false;
60     }
61 
62     virtual PassRefPtr<TransformOperation> blend(const TransformOperation* from, double progress, bool blendToIdentity = false);
63 
PerspectiveTransformOperation(const Length & p)64     PerspectiveTransformOperation(const Length& p)
65         : m_p(p)
66     {
67         ASSERT(p.isFixed());
68     }
69 
70     Length m_p;
71 };
72 
73 } // namespace WebCore
74 
75 #endif // PerspectiveTransformOperation_h
76