flightgear/src/GUI/PixmapImageItem.cxx

// PixmapImageItem.cxx - display a QPixmap/QImage directly
//
// Written by James Turner, started April 2018.
//
// Copyright (C) 2018 James Turner <james@flightgear.org>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

#include "PixmapImageItem.hxx"

#include <QPainter>

PixmapImageItem::PixmapImageItem(QQuickItem* parent) :
    QQuickPaintedItem(parent)
{

}

void PixmapImageItem::paint(QPainter *painter)
{
    if (_image.isNull())
        return;

    QRect rect(0, 0, width(), height());
    painter->drawImage(rect, _image);
}

void PixmapImageItem::setImage(QImage img)
{
    if (img == _image)
        return;

    _image = img;
    update();
    const auto sz = img.size() / img.devicePixelRatio();
    setImplicitSize(sz.width(), sz.height());
    emit imageChanged();
}