/*
 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * 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 FEComposite_h
#define FEComposite_h

#include "SkBlendMode.h"
#include "platform/graphics/filters/FilterEffect.h"

namespace blink {

enum CompositeOperationType {
  FECOMPOSITE_OPERATOR_UNKNOWN = 0,
  FECOMPOSITE_OPERATOR_OVER = 1,
  FECOMPOSITE_OPERATOR_IN = 2,
  FECOMPOSITE_OPERATOR_OUT = 3,
  FECOMPOSITE_OPERATOR_ATOP = 4,
  FECOMPOSITE_OPERATOR_XOR = 5,
  FECOMPOSITE_OPERATOR_ARITHMETIC = 6,
  FECOMPOSITE_OPERATOR_LIGHTER = 7
};

class PLATFORM_EXPORT FEComposite final : public FilterEffect {
 public:
  static FEComposite* create(Filter*,
                             const CompositeOperationType&,
                             float,
                             float,
                             float,
                             float);

  CompositeOperationType operation() const;
  bool setOperation(CompositeOperationType);

  float k1() const;
  bool setK1(float);

  float k2() const;
  bool setK2(float);

  float k3() const;
  bool setK3(float);

  float k4() const;
  bool setK4(float);

  TextStream& externalRepresentation(TextStream&, int indention) const override;

 protected:
  bool mayProduceInvalidPreMultipliedPixels() override {
    return m_type == FECOMPOSITE_OPERATOR_ARITHMETIC;
  }

 private:
  FEComposite(Filter*,
              const CompositeOperationType&,
              float,
              float,
              float,
              float);

  FloatRect mapInputs(const FloatRect&) const override;

  bool affectsTransparentPixels() const override;

  sk_sp<SkImageFilter> createImageFilter() override;
  sk_sp<SkImageFilter> createImageFilterWithoutValidation() override;
  sk_sp<SkImageFilter> createImageFilterInternal(
      bool requiresPMColorValidation);

  CompositeOperationType m_type;
  float m_k1;
  float m_k2;
  float m_k3;
  float m_k4;
};

}  // namespace blink

#endif  // FEComposite_h
