ImageLoader.cpp

/*
    Scan Tailor - Interactive post-processing tool for scanned pages.
    Copyright (C)  Joseph Artsimovich <joseph.artsimovigh@gmail.com>

    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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "ImageLoader.h"
#include <QFile>
#include <QImage>
#include <QtGui/QImageReader>
#include "ImageId.h"
#include "TiffReader.h"

QImage ImageLoader::load(const ImageId& image_id) {
  return load(image_id.filePath(), image_id.zeroBasedPage());
}

QImage ImageLoader::load(const QString& file_path, const int page_num) {
  QFile file(file_path);
  if (!file.open(QIODevice::ReadOnly)) {
    return QImage();
  }

  return load(file, page_num);
}

QImage ImageLoader::load(QIODevice& io_dev, const int page_num) {
  if (TiffReader::canRead(io_dev)) {
    return TiffReader::readImage(io_dev, page_num);
  }

  if (page_num != 0) {
    // Qt can only load the first page of multi-page images.
    return QImage();
  }

  QImage image;
  QImageReader(&io_dev).read(&image);

  return image;
}