File indexing completed on 2024-04-28 17:04:38

 /*****************************************************************************
  *   Copyright 2007 - 2010 Craig Drummond <craig.p.drummond@gmail.com>       *
  *   Copyright 2013 - 2015 Yichao Yu <yyc1992@gmail.com>                     *
  *                                                                           *
  *   This program 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) version 3, or any later version accepted   *
  *   by the membership of KDE e.V. (or its successor approved by the         *
  *   membership of KDE e.V.), which shall act as a proxy defined in          *
  *   Section 6 of version 3 of the license.                                  *
  *                                                                           *
  *   This program 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. If not,                                *
  *   see <http://www.gnu.org/licenses/>.                                     *
  *****************************************************************************/
 
 #ifndef __QTCURVESHADOWCACHE_H__
 #define __QTCURVESHADOWCACHE_H__
 
 //////////////////////////////////////////////////////////////////////////////
 // Taken from: oxygenshadowcache.h
 // handles caching of TileSet objects to draw shadows
 // -------------------
 //
 // Copyright (c) 2009 Hugo Pereira Da Costa <hugo.pereira@free.fr>
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to
 // deal in the Software without restriction, including without limitation the
 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 // sell copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
 // The above copyright notice and this permission notice shall be included in
 // all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 // IN THE SOFTWARE.
 //////////////////////////////////////////////////////////////////////////////
 
 //#define NEW_SHADOWS
 
 #include "qtcurveshadowconfiguration.h"
 #include "tileset.h"
 
 #include <qtcurve-utils/number.h>
 
 #include <QCache>
 #include <QRadialGradient>
 
 #include <cmath>
 
 class QtCurveHelper;
 
 namespace QtCurve {
 namespace KWin {
 
 class QtCurveClient;
 
 class QtCurveShadowCache {
 public:
     QtCurveShadowCache();
 
     const QColor&
     color(bool active)
     {
         return (active ? m_activeShadowConfig.color() :
                 m_inactiveShadowConfig.color());
     }
 
     void
     invalidateCaches()
     {
         m_shadowCache.clear();
     }
 
     //! returns true if provided shadow configuration changes with respect to
     //  stored
     /*!
      * use ShadowConfig::colorRole() to decide whether it should be stored
      * as active or inactive
      */
     bool shadowConfigChanged(const ShadowConfig &other) const;
 
     //! set shadowConfiguration
     /*!
      * use ShadowConfig::colorRole() to decide whether it should be stored
      * as active or inactive
      */
     void setShadowConfig(const ShadowConfig &other);
 
     //! shadow size
     qreal
     shadowSize() const
     {
         qreal size(qMax(m_activeShadowConfig.shadowSize(),
                         m_inactiveShadowConfig.shadowSize()));
 
         // even if shadows are disabled, you need a minimum size to allow
         // corner rendering
         return qMax(size, 5.0);
     }
 
     TileSet *tileSet(const QtCurveClient *client, bool roundAllCorners);
 
     //! Key class to be used into QCache
     /*! class is entirely inline for optimization */
     class Key {
     public:
         explicit Key() : active(false), isShade(false) {}
         Key(const QtCurveClient *client);
         Key(int hash) : active((hash >> 1) & 1), isShade(hash & 1) {}
 
         int hash() const
         {
             return (active << 1) | isShade;
         }
 
         const bool active;
         const bool isShade;
     };
 
     class Parabolic {
     public:
         //! constructor
         Parabolic(qreal amplitude, qreal width)
             : m_amplitude(amplitude), m_width(width) {}
         //! value
         qreal
         operator() (qreal x) const
         {
             return qMax(0.0, m_amplitude * (1.0 - qtcSquare(x / m_width)));
         }
     private:
         const qreal m_amplitude;
         const qreal m_width;
     };
 
     class Gaussian {
     public:
         Gaussian(qreal amplitude, qreal width)
             : m_amplitude(amplitude), m_width(width) {}
         //! value
         qreal
         operator() (qreal x) const
         {
             return qMax(0.0, m_amplitude *
                         (std::exp(-qtcSquare(x / m_width) - 0.05)));
         }
     private:
         const qreal m_amplitude;
         const qreal m_width;
     };
 
     //! complex pixmap (when needed)
     QPixmap shadowPixmap(const QtCurveClient *client, bool active,
                          bool roundAllCorners) const;
 
     //! simple pixmap
     QPixmap simpleShadowPixmap(const QColor &color, bool active,
                                bool roundAllCorners) const;
 
     void reset() { m_shadowCache.clear(); }
 
 private:
     //! draw gradient into rect
     /*! a separate method is used in order to properly account for corners */
     void renderGradient(QPainter &p, const QRectF &rect,
                         const QRadialGradient &rg, bool hasBorder) const;
 
     typedef QCache<int, TileSet> TileSetCache;
 
     ShadowConfig m_activeShadowConfig;
     ShadowConfig m_inactiveShadowConfig;
     TileSetCache m_shadowCache;
 };
 
 }
 }
 
 #endif