kis_painting_tweaks.h

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/*
 *  SPDX-FileCopyrightText: 2016 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#ifndef __KIS_PAINTING_TWEAKS_H
#define __KIS_PAINTING_TWEAKS_H
 
#include "kritaglobal_export.h"
 
#include <QPen>
#include <QBrush>
 
#include <QVector3D>
#include <QVector2D>
 
class QPainter;
class QRegion;
class QRect;
class QPen;
 
namespace KisPaintingTweaks {
 
    KRITAGLOBAL_EXPORT QRegion safeClipRegion(const QPainter &painter);
 
    KRITAGLOBAL_EXPORT QRect safeClipBoundingRect(const QPainter &painter);
 
    KRITAGLOBAL_EXPORT void initAntsPen(QPen *antsPen, QPen *outlinePen,
                                        int antLength = 4, int antSpace = 4,
                                        QColor black = QColor(Qt::black), QColor white = QColor(Qt::white));
 
 
    class KRITAGLOBAL_EXPORT PenBrushSaver
    {
    public:
        struct allow_noop_t { explicit allow_noop_t() = default; };
        static constexpr allow_noop_t   allow_noop { };
 
        PenBrushSaver(QPainter *painter);
 
        PenBrushSaver(QPainter *painter, const QPen &pen, const QBrush &brush);
 
        PenBrushSaver(QPainter *painter, const QPair<QPen, QBrush> &pair);
 
        PenBrushSaver(QPainter *painter, const QPair<QPen, QBrush> &pair, allow_noop_t);
 
        ~PenBrushSaver();
 
    private:
        PenBrushSaver(const PenBrushSaver &rhs) = delete;
        QPainter *m_painter;
        QPen m_pen;
        QBrush m_brush;
    };
 
    QColor KRITAGLOBAL_EXPORT blendColors(const QColor &c1, const QColor &c2, qreal r1);
 
 
    qreal KRITAGLOBAL_EXPORT luminosityCoarse(const QColor &c, bool sRGBtrc = true);
 
    qreal KRITAGLOBAL_EXPORT colorDifference(const QColor &c1, const QColor &c2);
 
    void KRITAGLOBAL_EXPORT dragColor(QColor *color, const QColor &baseColor, qreal threshold);
 
    inline void rectToVertices(QVector3D* vertices, const QRectF &rc)
    {
        vertices[0] = QVector3D(rc.left(),  rc.bottom(), 0.f);
        vertices[1] = QVector3D(rc.left(),  rc.top(),    0.f);
        vertices[2] = QVector3D(rc.right(), rc.bottom(), 0.f);
        vertices[3] = QVector3D(rc.left(),  rc.top(), 0.f);
        vertices[4] = QVector3D(rc.right(), rc.top(), 0.f);
        vertices[5] = QVector3D(rc.right(), rc.bottom(),    0.f);
    }
 
    inline void rectToTexCoords(QVector2D* texCoords, const QRectF &rc)
    {
        texCoords[0] = QVector2D(rc.left(), rc.bottom());
        texCoords[1] = QVector2D(rc.left(), rc.top());
        texCoords[2] = QVector2D(rc.right(), rc.bottom());
        texCoords[3] = QVector2D(rc.left(), rc.top());
        texCoords[4] = QVector2D(rc.right(), rc.top());
        texCoords[5] = QVector2D(rc.right(), rc.bottom());
    }
}
 
#endif /* __KIS_PAINTING_TWEAKS_H */