flutter_flutter/sky/engine/platform/transforms/ScaleTransformOperation.h

/*
 * 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 SKY_ENGINE_PLATFORM_TRANSFORMS_SCALETRANSFORMOPERATION_H_
#define SKY_ENGINE_PLATFORM_TRANSFORMS_SCALETRANSFORMOPERATION_H_

#include "flutter/sky/engine/platform/transforms/TransformOperation.h"

namespace blink {

class PLATFORM_EXPORT ScaleTransformOperation : public TransformOperation {
 public:
  static PassRefPtr<ScaleTransformOperation> create(double sx,
                                                    double sy,
                                                    OperationType type) {
    return adoptRef(new ScaleTransformOperation(sx, sy, 1, type));
  }

  static PassRefPtr<ScaleTransformOperation> create(double sx,
                                                    double sy,
                                                    double sz,
                                                    OperationType type) {
    return adoptRef(new ScaleTransformOperation(sx, sy, sz, type));
  }

  double x() const { return m_x; }
  double y() const { return m_y; }
  double z() const { return m_z; }

  virtual bool canBlendWith(const TransformOperation& other) const;

 private:
  virtual bool isIdentity() const override {
    return m_x == 1 && m_y == 1 && m_z == 1;
  }

  virtual OperationType type() const override { return m_type; }

  virtual bool operator==(const TransformOperation& o) const override {
    if (!isSameType(o))
      return false;
    const ScaleTransformOperation* s =
        static_cast<const ScaleTransformOperation*>(&o);
    return m_x == s->m_x && m_y == s->m_y && m_z == s->m_z;
  }

  virtual void apply(TransformationMatrix& transform,
                     const FloatSize&) const override {
    transform.scale3d(m_x, m_y, m_z);
  }

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

  ScaleTransformOperation(double sx, double sy, double sz, OperationType type)
      : m_x(sx), m_y(sy), m_z(sz), m_type(type) {
    ASSERT(type == ScaleX || type == ScaleY || type == ScaleZ ||
           type == Scale || type == Scale3D);
  }

  double m_x;
  double m_y;
  double m_z;
  OperationType m_type;
};

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_TRANSFORMS_SCALETRANSFORMOPERATION_H_