text: /*
   * 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_FILTERS_FE_COMPONENT_TRANSFER_H_
  #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_FILTERS_FE_COMPONENT_TRANSFER_H_
  
  #include "third_party/blink/renderer/platform/graphics/filters/filter_effect.h"
  #include "third_party/blink/renderer/platform/wtf/vector.h"
  
  namespace blink {
  
  enum ComponentTransferType {
    FECOMPONENTTRANSFER_TYPE_UNKNOWN = 0,
    FECOMPONENTTRANSFER_TYPE_IDENTITY = 1,
    FECOMPONENTTRANSFER_TYPE_TABLE = 2,
    FECOMPONENTTRANSFER_TYPE_DISCRETE = 3,
    FECOMPONENTTRANSFER_TYPE_LINEAR = 4,
    FECOMPONENTTRANSFER_TYPE_GAMMA = 5
  };
  
  struct ComponentTransferFunction {
    DISALLOW_NEW();
    ComponentTransferFunction()
        : type(FECOMPONENTTRANSFER_TYPE_UNKNOWN),
          slope(0),
          intercept(0),
          amplitude(0),
          exponent(0),
          offset(0) {}
  
    ComponentTransferType type;
  
    float slope;
    float intercept;
    float amplitude;
    float exponent;
    float offset;
  
    Vector<float> table_values;
  };
  
  class PLATFORM_EXPORT FEComponentTransfer final : public FilterEffect {
   public:
    FEComponentTransfer(Filter*,
                        const ComponentTransferFunction& red_func,
                        const ComponentTransferFunction& green_func,
                        const ComponentTransferFunction& blue_func,
                        const ComponentTransferFunction& alpha_func);
  
    WTF::TextStream& ExternalRepresentation(WTF::TextStream&,
                                            int indention) const override;
  
   private:
    sk_sp<PaintFilter> CreateImageFilter() override;
  
    bool AffectsTransparentPixels() const override;
  
    void GetValues(unsigned char r_values[256],
                   unsigned char g_values[256],
                   unsigned char b_values[256],
                   unsigned char a_values[256]);
  
    ComponentTransferFunction red_func_;
    ComponentTransferFunction green_func_;
    ComponentTransferFunction blue_func_;
    ComponentTransferFunction alpha_func_;
  };
  
  }  // namespace blink
  
  #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_FILTERS_FE_COMPONENT_TRANSFER_H_
  