/*
 * 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 FEColorMatrix_h
#define FEColorMatrix_h

#include "platform/graphics/filters/FilterEffect.h"
#include "wtf/Vector.h"

namespace blink {

enum ColorMatrixType {
  FECOLORMATRIX_TYPE_UNKNOWN = 0,
  FECOLORMATRIX_TYPE_MATRIX = 1,
  FECOLORMATRIX_TYPE_SATURATE = 2,
  FECOLORMATRIX_TYPE_HUEROTATE = 3,
  FECOLORMATRIX_TYPE_LUMINANCETOALPHA = 4
};

class PLATFORM_EXPORT FEColorMatrix final : public FilterEffect {
 public:
  static FEColorMatrix* create(Filter*, ColorMatrixType, const Vector<float>&);

  ColorMatrixType type() const;
  bool setType(ColorMatrixType);

  const Vector<float>& values() const;
  bool setValues(const Vector<float>&);

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

  static inline void calculateSaturateComponents(float* components,
                                                 float value);
  static inline void calculateHueRotateComponents(float* components,
                                                  float value);

 private:
  FEColorMatrix(Filter*, ColorMatrixType, const Vector<float>&);

  sk_sp<SkImageFilter> createImageFilter() override;

  bool affectsTransparentPixels() const override;

  ColorMatrixType m_type;

  // The m_values vector may not contain the right number of values. Always
  // check before accessing contents.
  Vector<float> m_values;
};

}  // namespace blink

#endif  // FEColorMatrix_h
