Differential D15514 Diff 43140 libbreezecommon/breezeboxshadowrenderer.h

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libbreezecommon/breezeboxshadowrenderer.h

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		1		/*
		2		* Copyright (C) 2018 Vlad Zagorodniy <vladzzag@gmail.com>
		3		*
		4		* This program is free software; you can redistribute it and/or modify
		5		* it under the terms of the GNU General Public License as published by
		6		* the Free Software Foundation; either version 2 of the License, or
		7		* (at your option) any later version.
		8		*
		9		* This program is distributed in the hope that it will be useful,
		10		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		11		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		12		* GNU General Public License for more details.
		13		*
		14		* You should have received a copy of the GNU General Public License
		15		* along with this program; if not, write to the Free Software
		16		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
		17		*/
		18
		19		#pragma once
		20
		21		// own
		22		#include "breezecommon_export.h"
		23
		24		// Qt
		25		#include <QImage>
		26		#include <QPoint>
		27		#include <QSize>
		28
		29		namespace Breeze
		30		{
		31
		32		class BREEZECOMMON_EXPORT BoxShadowRenderer
		33		{
		34		public:
		35		// Compiler generated constructors & destructor are fine.
		36
		37		/**
		38		* Set the size of the box.
		39		* @param size The size of the box.
		40		**/
		41		void setBoxSize(const QSize &size);
		42
		43		/**
		44		* Set the radius of box' corners.
		45		* @param radius The border radius, in pixels.
		46		**/
		47		void setBorderRadius(qreal radius);
		48
		49		/**
		50		* Set the device pixel ratio of the resulting shadow texture.
		51		* @param dpr The device pixel ratio.
		52		**/
		53		void setDevicePixelRatio(qreal dpr);
		54
		55		/**
		56		* Add a shadow.
		57		* @param offset The offset of the shadow.
		58		* @param radius The blur radius.
		59		* @param color The color of the shadow.
		60		**/
		61		void addShadow(const QPoint &offset, int radius, const QColor &color);
		62
		63		/**
		64		* Render the shadow.
		65		**/
		66		QImage render() const;
		67
		68		/**
		69		* Calculate the minimum size of the box.
		70		*
		71		* This helper computes the minimum size of the box so the shadow behind it has
		72		* full its strength.
		73		*
		74		* @param radius The blur radius of the shadow.
		75		**/
		76		static QSize calculateMinimumBoxSize(int radius);
		77
		78		/**
		79		* Calculate the minimum size of the shadow texture.
		80		*
		81		* This helper computes the minimum size of the resulting texture so the shadow
		82		* is not clipped.
		83		*
		84		* @param boxSize The size of the box.
		85		* @param radius The blur radius.
		86		* @param offset The offset of the shadow.
		87		**/
		88		static QSize calculateMinimumShadowTextureSize(const QSize &boxSize, int radius, const QPoint &offset);
		89
		90		private:
		91		QSize m_boxSize;
		92		qreal m_borderRadius = 0.0;
		93		qreal m_dpr = 1.0;
		94
		95		struct Shadow {
		96		QPoint offset;
		97		int radius;
		98		QColor color;
		99		};
		100
		101		QVector<Shadow> m_shadows;
		102		};
		103
		104		} // namespace Breeze