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98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/*
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* Copyright (C) 2018 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#pragma once
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// Qt
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#include <QColor>
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#include <QImage>
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#include <QPoint>
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#include <QSize>
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class BoxShadowRenderer
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{
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public:
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// Compiler generated constructors & destructor are fine.
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/**
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* Set the size of the box.
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* @param size The size of the box.
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**/
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void setBoxSize(const QSize &size);
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/**
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* Set the radius of box' corners.
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* @param radius The border radius, in pixels.
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**/
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void setBorderRadius(qreal radius);
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/**
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* Set the device pixel ratio of the resulting shadow texture.
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* @param dpr The device pixel ratio.
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**/
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void setDevicePixelRatio(qreal dpr);
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/**
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* Add a shadow.
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* @param offset The offset of the shadow.
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* @param radius The blur radius.
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* @param color The color of the shadow.
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**/
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void addShadow(const QPoint &offset, int radius, const QColor &color);
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/**
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* Render the shadow.
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**/
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QImage render() const;
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/**
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* Calculate the minimum size of the box.
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*
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* This helper computes the minimum size of the box so the shadow behind it has
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* full its strength.
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*
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* @param radius The blur radius of the shadow.
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**/
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static QSize calculateMinimumBoxSize(int radius);
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/**
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* Calculate the minimum size of the shadow texture.
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*
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* This helper computes the minimum size of the resulting texture so the shadow
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* is not clipped.
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*
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* @param boxSize The size of the box.
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* @param radius The blur radius.
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* @param offset The offset of the shadow.
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**/
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static QSize calculateMinimumShadowTextureSize(const QSize &boxSize, int radius, const QPoint &offset);
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private:
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QSize m_boxSize;
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qreal m_borderRadius = 0.0;
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qreal m_dpr = 1.0;
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struct Shadow {
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QPoint offset;
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int radius;
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QColor color;
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};
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QVector<Shadow> m_shadows;
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};
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