File indexing completed on 2024-12-22 04:31:07

 /*
  * Copyright (C) 2018 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * 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 General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #pragma once
 
 // Qt
 #include <QColor>
 #include <QImage>
 #include <QPoint>
 #include <QSize>
 
 class BoxShadowRenderer
 {
 public:
     // Compiler generated constructors & destructor are fine.
 
     /**
      * Set the size of the box.
      * @param size The size of the box.
      **/
     void setBoxSize(const QSize &size);
 
     /**
      * Set the radius of box' corners.
      * @param radius The border radius, in pixels.
      **/
     void setBorderRadius(qreal radius);
 
     /**
      * Set the device pixel ratio of the resulting shadow texture.
      * @param dpr The device pixel ratio.
      **/
     void setDevicePixelRatio(qreal dpr);
 
     /**
      * Add a shadow.
      * @param offset The offset of the shadow.
      * @param radius The blur radius.
      * @param color The color of the shadow.
      **/
     void addShadow(const QPoint &offset, int radius, const QColor &color);
 
     /**
      * Render the shadow.
      **/
     QImage render() const;
 
     /**
      * Calculate the minimum size of the box.
      *
      * This helper computes the minimum size of the box so the shadow behind it has
      * full its strength.
      *
      * @param radius The blur radius of the shadow.
      **/
     static QSize calculateMinimumBoxSize(int radius);
 
     /**
      * Calculate the minimum size of the shadow texture.
      *
      * This helper computes the minimum size of the resulting texture so the shadow
      * is not clipped.
      *
      * @param boxSize The size of the box.
      * @param radius The blur radius.
      * @param offset The offset of the shadow.
      **/
     static QSize calculateMinimumShadowTextureSize(const QSize &boxSize, int radius, const QPoint &offset);
 
 private:
     QSize m_boxSize;
     qreal m_borderRadius = 0.0;
     qreal m_dpr = 1.0;
 
     struct Shadow {
         QPoint offset;
         int radius;
         QColor color;
     };
 
     QVector<Shadow> m_shadows;
 };