WebCore/PerspectiveTransformOperation.h

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