Cppcheck - HTML report - digiKam-nl-search-more-criteria-rev-e2466e0973

# Cppcheck report - digiKam-nl-search-more-criteria-rev-e2466e0973: ../../core/libs/widgets/graphicsview/magnifieritem.cpp

      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    /* ============================================================
     *
     * This file is a part of digiKam project
     * https://www.digikam.org
     *
     * Date        : 2025-12-22
     * Description : a magnifier tool for the GraphicsDImgView canvas.
     *
     * SPDX-FileCopyrightText: 2025-2026 by Gilles Caulier <caulier dot gilles at gmail dot com>
     *
     * SPDX-License-Identifier: GPL-2.0-or-later
     *
     * ============================================================ */

    #include "magnifieritem.h"

    // Qt includes

    #include <QPainter>
    #include <QStyleOptionGraphicsItem>

    namespace Digikam
    {

    class Q_DECL_HIDDEN MagnifierItem::Private
    {
    public:

        Private() = default;

    public:

        QPixmap sourcePixmap;
        QRectF  sourceRect;
        qreal   zoomFactor   = MagnifierItem::zoomFactors().constFirst();
        int     size         = 150;
    };

    MagnifierItem::MagnifierItem(QGraphicsItem* const parent)
        : QGraphicsItem(parent),
          d            (new Private)

    {
        setZValue(10); // Be sure that the loop is always behind the image
    }

    MagnifierItem::~MagnifierItem()
    {
        delete d;
    }

    QList<qreal> MagnifierItem::zoomFactors()
    {
        return (QList<qreal>() << 1.5 << 2.0 << 2.5 << 3.0 << 3.5 << 4.0 << 6.0 << 8.0);
    }

    void MagnifierItem::setSourcePixmap(const QPixmap& pixmap, const QRectF& rect)
    {
        d->sourcePixmap = pixmap;
        d->sourceRect   = rect;
        update();
    }

    void MagnifierItem::setZoomFactor(qreal factor)
    {
        d->zoomFactor = factor;
        update();
    }

    qreal MagnifierItem::zoomFactor() const
    {
        return d->zoomFactor;
    }

    void MagnifierItem::setMagnifierSize(int magnifierSize)<--- Shadow argument
    {
        d->size = magnifierSize;
        update();
    }

    int MagnifierItem::magnifierSize() const
    {
        return d->size;
    }

    QRectF MagnifierItem::boundingRect() const
    {
        return QRectF(-d->size / 2, -d->size / 2, d->size, d->size);
    }

    void MagnifierItem::paint(QPainter* painter, const QStyleOptionGraphicsItem*, QWidget*)
    {
        if (d->sourcePixmap.isNull())
        {
            return;
        }

        // First draw the border.

        QPainterPath borderPath;
        borderPath.addEllipse(boundingRect());

        // Define a gradient for the border.

        QRadialGradient borderGradient(0, 0, d->size / 2);
        borderGradient.setColorAt(0,   QColor(50, 50, 50, 255));            // Darkness inside surround.
        borderGradient.setColorAt(0.7, QColor(200, 200, 200, 255));         // Lightness outside surround.

        // Draw a border with a large pencil.

        painter->setPen(QPen(QBrush(borderGradient), 4));                   // Border of 4 pixels.
        painter->setBrush(Qt::NoBrush);
        painter->drawPath(borderPath);

        // Create a ellipsis path for the clipping.

        QPainterPath clipPath;
        clipPath.addEllipse(boundingRect().adjusted(2, 2, -2, -2));         // Adjustment to highlight border.

        // Apply clipping.

        painter->setClipPath(clipPath);
        painter->setRenderHint(QPainter::Antialiasing, true);

        // Draw the background of the magnifier with a gradient

        QRadialGradient fillGradient(0, 0, (d->size / 2) - 2);              // Preserve the border.
        fillGradient.setColorAt(0, QColor(255, 255, 255, 220));             // Center semi-transparent using white.
        fillGradient.setColorAt(1, QColor(255, 255, 255, 100));             // Border more transparent.

        painter->setBrush(fillGradient);
        painter->setPen(Qt::NoPen);
        painter->drawEllipse(boundingRect().adjusted(4, 4, -4, -4));        // Draw a little bit inside the border.

        // Draw the zommed pixmap.

        QPixmap zoomed = d->sourcePixmap.copy(d->sourceRect.toRect())
                                       .scaled(d->size - 2, d->size - 2,
                                               Qt::KeepAspectRatio,
                                               Qt::SmoothTransformation);   // Adjust to preserve the border.

        painter->drawPixmap(QRectF(-(d->size / 2) + 2, -(d->size / 2) + 2, d->size - 4, d->size - 4),
                            zoomed,
                            zoomed.rect());

        // Reset clipping.

        painter->setClipping(false);
    }

    } // namespace Digikam