render_image.cpp

/*
 * A simple image renderer.
 * Copyright (c) 2021-2026 Benjamin Johnson
 *
 * 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 <QtCore>
#include <QImageReader>

#include "render_image.h"

ImageRenderer::ImageRenderer()
    : PagedContentRenderer()
{
}

bool ImageRenderer::load()
{
    QImageReader reader(path());
    if (reader.read(&image))
        return true;
    else {
        storeLoadError(reader.errorString());
        return false;
    }
}

void ImageRenderer::renderPage(int num)
{
    if (image.isNull()) {
        emit errorEncountered();
        return;
    }

    if (zoomFactor() == 100)
        emit renderedPage(num, image);
    else
        emit renderedPage(num, image.scaledToWidth(zoomScaled(image.width()),
                                                   Qt::SmoothTransformation));
}