/*
 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
 *           (C) 2000 Antti Koivisto (koivisto@kde.org)
 *           (C) 2000 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef TransformOperation_h
#define TransformOperation_h

#include "FloatSize.h"
#include "TransformationMatrix.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>

namespace WebCore {

// CSS Transforms (may become part of CSS3)

class TransformOperation : public RefCounted<TransformOperation> {
public:
    enum OperationType {
        SCALE_X, SCALE_Y, SCALE, 
        TRANSLATE_X, TRANSLATE_Y, TRANSLATE, 
        ROTATE,
        ROTATE_Z = ROTATE,
        SKEW_X, SKEW_Y, SKEW, 
        MATRIX,
        SCALE_Z, SCALE_3D,
        TRANSLATE_Z, TRANSLATE_3D,
        ROTATE_X, ROTATE_Y, ROTATE_3D,
        MATRIX_3D,
        PERSPECTIVE,
        IDENTITY, NONE
    };

    virtual ~TransformOperation() { }

    virtual bool operator==(const TransformOperation&) const = 0;
    bool operator!=(const TransformOperation& o) const { return !(*this == o); }

    virtual bool isIdentity() const = 0;

    // Return true if the borderBoxSize was used in the computation, false otherwise.
    virtual bool apply(TransformationMatrix&, const FloatSize& borderBoxSize) const = 0;

    virtual PassRefPtr<TransformOperation> blend(const TransformOperation* from, double progress, bool blendToIdentity = false) = 0;

    OperationType type() const { return m_type; }

    bool isSameType(const TransformOperation& o) const { return o.type() == m_type; }
    
    bool is3DOperation() const
    {
        OperationType opType = type();
        return opType == SCALE_Z ||
               opType == SCALE_3D ||
               opType == TRANSLATE_Z ||
               opType == TRANSLATE_3D ||
               opType == ROTATE_X ||
               opType == ROTATE_Y ||
               opType == ROTATE_3D ||
               opType == MATRIX_3D ||
               opType == PERSPECTIVE;
    }

protected:
    TransformOperation(OperationType type)
	: m_type(type)
	{
	}

    OperationType m_type;
};

} // namespace WebCore

#endif // TransformOperation_h
