ImageMaskEditor.h

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#pragma once
 
#include <QColor>
#include <QImage>
#include <QPoint>
#include <QWidget>
 
class ImageMaskEditor : public QWidget
{
    Q_OBJECT
 
public:
    ImageMaskEditor(QSize size, QWidget* parent = nullptr);
 
    ImageMaskEditor(int width = 64, int height = 64, QWidget* parent = nullptr);
 
    bool openMaskImage(const QString& fileName);
    bool openBackgroundImage(const QString& fileName);
 
    bool saveMaskImage(const QString& fileName, const char* fileFormat);
    bool saveBackgroundImage(const QString& fileName, const char* fileFormat);
 
    const QColor& maskColor() const;
    const QColor& transparentColor() const;
    int penWidth() const;
 
    const QImage& backgroundImage() const;
    QImage maskImage() const;
 
    QSize imageSize() const;
 
    QSize sizeHint() const override;
 
public slots:
    void setMaskColor(const QColor& newColor);
    void setMaskColor(int r, int g, int b);
    void setMaskColor(qreal r, qreal g, qreal b);
    void setTransparentColor(const QColor& newColor);
    void setTransparentColor(int r, int g, int b);
    void setTransparentColor(qreal r, qreal g, qreal b);
    void clearMaskImage();
    void setPenWidth(int newWidth);
    void setMaskAlpha(int newAlpha);
    void setImageSize(QSize size, bool doNotShrink = false);
    void resizeImage(QSize size, bool doNotShrink = false);
    void setMaskImage(const QImage& i);
    void setBackgroundImage(const QImage& i);
    void setPenCircleVisible(bool b = true);
 
signals:
    void maskUpdated();
    void maskUpdateFinished();
    void arrowDrawn(const QPoint& arrowStart, const QPoint& arrowEnd);
 
protected:
    void mousePressEvent(QMouseEvent* event) override;
    void mouseMoveEvent(QMouseEvent* event) override;
    void mouseReleaseEvent(QMouseEvent* event) override;
    void paintEvent(QPaintEvent* event) override;
 
private:
    void drawOnMask(const QPoint& endPoint);
    void resizeImage(QImage* image, const QSize& newSize, const QColor& fillcolor);
 
    bool    _drawing {false};
    bool    _maskModified {false};
    bool    _drawPenCircle {false};
 
    int    _penWidth {1};
    QColor _penColor {Qt::red};
 
    QColor _maskTransparentColor {Qt::black};
    QImage _maskImage;
    int    _maskAlpha {0};
 
    QImage _backgroundImage;
 
    QPoint _lastPoint;
};