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 /*
  *  Copyright (c) 2014 Dmitry Kazakov <dimula73@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser 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 __KO_COLOR_DISPLAY_RENDERER_INTERFACE_H
 #define __KO_COLOR_DISPLAY_RENDERER_INTERFACE_H
 
 #include <QObject>
 #include <QColor>
 #include <QSharedPointer>
 
 #include "KoColor.h"
 
 class KoChannelInfo;
 
 /**
  * A special interface class provided by pigment to let widgets render
  * a KoColor on screen using custom profiling provided by the user.
  *
  * If you want to provide your own rendering of the KoColor on screen,
  * reimplement this class and provide its instance to a supporting
  * widget.
  */
 class PIGMENTCMS_EXPORT KoColorDisplayRendererInterface : public QObject
 {
     Q_OBJECT
 
 public:
     KoColorDisplayRendererInterface();
     ~KoColorDisplayRendererInterface() override;
 
     /**
      * Convert the color \p c to a custom QColor that will be
      * displayed by the widget on screen. Please note, that the
      * reverse conversion may simply not exist.
      */
     virtual QColor toQColor(const KoColor &c) const = 0;
 
     /**
      * This tries to approximate a rendered QColor into the KoColor
      * of the painting color space. Please note, that in most of the
      * cases the exact reverse transformation does not exist, so the
      * resulting color will be only a rough approximation. Never try
      * to do a round trip like that:
      *
      * // r will never be equal to c!
      * r = approximateFromRenderedQColor(toQColor(c));
      */
     virtual KoColor approximateFromRenderedQColor(const QColor &c) const = 0;
 
     virtual KoColor fromHsv(int h, int s, int v, int a = 255) const = 0;
     virtual void getHsv(const KoColor &srcColor, int *h, int *s, int *v, int *a = 0) const = 0;
 
 
     /**
      * \return the minimum value of a floating point channel that can
      *         be seen on screen
      */
     virtual qreal minVisibleFloatValue(const KoChannelInfo *chaninfo) const = 0;
 
     /**
      * \return the maximum value of a floating point channel that can
      *         be seen on screen. In normal situation it is 1.0. When
      *         the user changes exposure the value varies.
      */
     virtual qreal maxVisibleFloatValue(const KoChannelInfo *chaninfo) const = 0;
 
 Q_SIGNALS:
     void displayConfigurationChanged();
 
 private:
     Q_DISABLE_COPY(KoColorDisplayRendererInterface)
 };
 
 /**
  * The default conversion class that just calls KoColor::toQColor()
  * conversion implementation which effectively renders the color into
  * sRGB color space.
  */
 class PIGMENTCMS_EXPORT KoDumbColorDisplayRenderer : public KoColorDisplayRendererInterface
 {
 Q_OBJECT
 public:
     QColor toQColor(const KoColor &c) const override;
     KoColor approximateFromRenderedQColor(const QColor &c) const override;
     KoColor fromHsv(int h, int s, int v, int a = 255) const override;
     void getHsv(const KoColor &srcColor, int *h, int *s, int *v, int *a = 0) const override;
 
     qreal minVisibleFloatValue(const KoChannelInfo *chaninfo) const override;
     qreal maxVisibleFloatValue(const KoChannelInfo *chaninfo) const override;
 
     static KoColorDisplayRendererInterface* instance();
 };
 
 #endif /* __KO_COLOR_DISPLAY_RENDERER_INTERFACE_H */