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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 "platform/transforms/TransformOperation.h"
     30 
     31 namespace WebCore {
     32 
     33 class PLATFORM_EXPORT PerspectiveTransformOperation : public TransformOperation {
     34 public:
     35     static PassRefPtr<PerspectiveTransformOperation> create(double p)
     36     {
     37         return adoptRef(new PerspectiveTransformOperation(p));
     38     }
     39 
     40     double perspective() const { return m_p; }
     41 
     42     virtual bool canBlendWith(const TransformOperation& other) const
     43     {
     44         return isSameType(other);
     45     }
     46 
     47 private:
     48     virtual bool isIdentity() const OVERRIDE { return !m_p; }
     49     virtual OperationType type() const OVERRIDE { return Perspective; }
     50 
     51     virtual bool operator==(const TransformOperation& o) const OVERRIDE
     52     {
     53         if (!isSameType(o))
     54             return false;
     55         const PerspectiveTransformOperation* p = static_cast<const PerspectiveTransformOperation*>(&o);
     56         return m_p == p->m_p;
     57     }
     58 
     59     virtual void apply(TransformationMatrix& transform, const FloatSize&) const OVERRIDE
     60     {
     61         transform.applyPerspective(m_p);
     62     }
     63 
     64     virtual PassRefPtr<TransformOperation> blend(const TransformOperation* from, double progress, bool blendToIdentity = false) OVERRIDE;
     65 
     66     PerspectiveTransformOperation(double p)
     67         : m_p(p)
     68     {
     69     }
     70 
     71     double m_p;
     72 };
     73 
     74 } // namespace WebCore
     75 
     76 #endif // PerspectiveTransformOperation_h
     77