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picture_loader.cpp
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picture_loader.cpp
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#include "picture_loader.h"
#include "quazip/quazip.h"
#include "quazip/quazipfile.h"
#include <QFile>
#include <QBuffer>
#include <QImageReader>
#include <QPainter>
//#define DEBUG_PICTURE_LOADER
#ifdef DEBUG_PICTURE_LOADER
#include <QDebug>
//#include <QTime>
#endif
QImage PictureLoader::getImage(const FileInfo &info)
{
#ifdef DEBUG_PICTURE_LOADER
qDebug() << QDateTime::currentDateTime().toString(Qt::ISODate) << "PictureLoader::getImage" << info.getFilePath();
#endif
if (!info.fileExists())
{
return QImage(0,0);
}
else if (info.isInArchive())
{
return PictureLoader::getImageFromZip(ThumbnailInfo(info, QSize(0, 0)));
}
else
{
return PictureLoader::getImageFromFile(ThumbnailInfo(info, QSize(0, 0)));
}
return QImage(0,0);
}
QImage PictureLoader::getThumbnail(const ThumbnailInfo &thumb_info)
{
#ifdef DEBUG_PICTURE_LOADER
qDebug() << QDateTime::currentDateTime().toString(Qt::ISODate) << "PictureLoader::getThumbnail" << thumb_info.getFileInfo().getFilePath() << thumb_info.getThumbSize();
#endif
if (!thumb_info.getFileInfo().fileExists())
{
return QImage(0,0);
}
else if (thumb_info.getFileInfo().isInArchive())
{
return PictureLoader::styleThumbnail(PictureLoader::getImageFromZip(thumb_info), thumb_info.getThumbSize());
}
else
{
return PictureLoader::styleThumbnail(PictureLoader::getImageFromFile(thumb_info), thumb_info.getThumbSize());
}
return QImage(0,0);
}
QImage PictureLoader::styleThumbnail(const QImage &img, const QSize &thumb_size)
{
QImage thumb(thumb_size.width() + 2, thumb_size.height() + 2, QImage::Format_ARGB32);
thumb.fill(qRgba(255, 255, 255, 0));
QPainter painter(&thumb);
QPoint imgPoint((thumb.width() - img.width()) / 2, (thumb.height() - img.height()) / 2);
painter.setPen(Qt::lightGray);
painter.drawImage(imgPoint, img);
painter.drawRect(0, 0, thumb.width() - 1, thumb.height() - 1);
painter.end();
return thumb;
}
QImage PictureLoader::getImageFromFile(const ThumbnailInfo &thumb_info)
{
QImageReader image_reader(thumb_info.getFileInfo().getPath());
#ifdef DEBUG_PICTURE_LOADER
qDebug() << QDateTime::currentDateTime().toString(Qt::ISODate) << thumb_info.getFileInfo().getPath() << image_reader.format() << image_reader.supportedImageFormats();
#endif
if (!thumb_info.getThumbSize().isEmpty())
{
if (image_reader.size().height() > thumb_info.getThumbSize().height() || image_reader.size().width() > thumb_info.getThumbSize().width())
{
image_reader.setScaledSize(PictureLoader::ThumbnailImageSize(image_reader.size(), thumb_info.getThumbSize()));
}
}
return image_reader.read();
}
QImage PictureLoader::getImageFromZip(const ThumbnailInfo &thumb_info)
{
QFile zipFile(thumb_info.getFileInfo().getContainerPath());
QuaZip zip(&zipFile);
if (!zip.open(QuaZip::mdUnzip))
{
qWarning("testRead(): zip.open(): %d", zip.getZipError());
return QImage(0, 0);
}
zip.setFileNameCodec("UTF-8");
if (!zip.setCurrentFile(thumb_info.getFileInfo().zipImagePath()))
{
return QImage(0, 0);
#ifdef DEBUG_PICTURE_LOADER
qDebug() << QDateTime::currentDateTime().toString(Qt::ISODate) << "PictureLoader::getImageFromZip setCurrentFile failed" << thumb_info.getFileInfo().zipImagePath();
#endif
}
QuaZipFile file(&zip);
char c;
if (!file.open(QIODevice::ReadOnly))
{
qWarning("testRead(): file.open(): %d", file.getZipError());
return QImage(0, 0);
}
QBuffer out;
out.open(QIODevice::WriteOnly);
char buf[4096];
int len = 0;
while (file.getChar(&c))
{
buf[len++] = c;
if (len >= 4096)
{
out.write(buf, len);
len = 0;
}
}
if (len > 0)
{
out.write(buf, len);
}
out.close();
#ifdef DEBUG_PICTURE_LOADER
qDebug() << QDateTime::currentDateTime().toString(Qt::ISODate) << "PictureLoader::getImageFromZip" << "finished reading from zip" << thumb_info.getFileInfo().getPath();
#endif
QImageReader image_reader(&out);
#ifdef DEBUG_PICTURE_LOADER
qDebug() << QDateTime::currentDateTime().toString(Qt::ISODate) << image_reader.format() << image_reader.supportedImageFormats();
#endif
if (!thumb_info.getThumbSize().isEmpty())
{
if (image_reader.size().height() > thumb_info.getThumbSize().height() || image_reader.size().width() > thumb_info.getThumbSize().width())
{
image_reader.setScaledSize(PictureLoader::ThumbnailImageSize(image_reader.size(), thumb_info.getThumbSize()));
}
}
return image_reader.read();
}
QSize PictureLoader::ThumbnailImageSize(const QSize &image_size, const QSize &thumb_size)
{
QSize result = image_size;
result.scale(thumb_size, Qt::KeepAspectRatio);
#ifdef DEBUG_PICTURE_LOADER
qDebug() << QDateTime::currentDateTime().toString(Qt::ISODate) << "PictureLoader::ThumbnailImageSize" << "scaling image from" << image_size << "to" << result;
#endif
return result;
}