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      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:
     36     static PassRefPtr<PerspectiveTransformOperation> create(const Length& p)
     37     {
     38         return adoptRef(new PerspectiveTransformOperation(p));
     39     }
     40 
     41     Length perspective() const { return m_p; }
     42 
     43 private:
     44     virtual bool isIdentity() const { return m_p.calcFloatValue(1) == 0; }
     45     virtual OperationType getOperationType() const { return PERSPECTIVE; }
     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 
     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 
     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