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LoadFileTask.cpp
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LoadFileTask.cpp
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/*
Scan Tailor - Interactive post-processing tool for scanned pages.
Copyright (C) Joseph Artsimovich <[email protected]>
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 "LoadFileTask.h"
#include "filters/fix_orientation/Task.h"
#include "TaskStatus.h"
#include "FilterResult.h"
#include "ErrorWidget.h"
#include "FilterUiInterface.h"
#include "AbstractFilter.h"
#include "FilterOptionsWidget.h"
#include "ThumbnailPixmapCache.h"
#include "ProjectPages.h"
#include "PageInfo.h"
#include "Dpi.h"
#include "Dpm.h"
#include "FilterData.h"
#include "ImageLoader.h"
#include <QCoreApplication>
#include <QFile>
#include <QDir>
#include <QImage>
#include <QString>
#include <QTextDocument> // for Qt::escape()
#include <assert.h>
using namespace imageproc;
class LoadFileTask::ErrorResult : public FilterResult
{
Q_DECLARE_TR_FUNCTIONS(LoadFileTask)
public:
ErrorResult(QString const& file_path);
virtual void updateUI(FilterUiInterface* ui);
virtual IntrusivePtr<AbstractFilter> filter() {
return IntrusivePtr<AbstractFilter>();
}
private:
QString m_filePath;
bool m_fileExists;
};
LoadFileTask::LoadFileTask(
Type type, PageInfo const& page,
IntrusivePtr<ThumbnailPixmapCache> const& thumbnail_cache,
IntrusivePtr<ProjectPages> const& pages,
IntrusivePtr<fix_orientation::Task> const& next_task)
: BackgroundTask(type),
m_ptrThumbnailCache(thumbnail_cache),
m_imageId(page.imageId()),
m_imageMetadata(page.metadata()),
m_ptrPages(pages),
m_ptrNextTask(next_task)
{
assert(m_ptrNextTask);
}
LoadFileTask::~LoadFileTask()
{
}
FilterResultPtr
LoadFileTask::operator()()
{
QImage image(ImageLoader::load(m_imageId));
try {
throwIfCancelled();
if (image.isNull()) {
return FilterResultPtr(new ErrorResult(m_imageId.filePath()));
} else {
updateImageSizeIfChanged(image);
overrideDpi(image);
m_ptrThumbnailCache->ensureThumbnailExists(m_imageId, image);
return m_ptrNextTask->process(*this, FilterData(image));
}
} catch (CancelledException const&) {
return FilterResultPtr();
}
}
void
LoadFileTask::updateImageSizeIfChanged(QImage const& image)
{
// The user might just replace a file with another one.
// In that case, we update its size that we store.
// Note that we don't do the same about DPI, because
// a DPI mismatch between the image and the stored value
// may indicate that the DPI was overridden.
// TODO: do something about DPIs when we have the ability
// to change DPIs at any point in time (not just when
// creating a project).
if (image.size() != m_imageMetadata.size()) {
m_imageMetadata.setSize(image.size());
m_ptrPages->updateImageMetadata(m_imageId, m_imageMetadata);
}
}
void
LoadFileTask::overrideDpi(QImage& image) const
{
// Beware: QImage will have a default DPI when loading
// an image that doesn't specify one.
Dpm const dpm(m_imageMetadata.dpi());
image.setDotsPerMeterX(dpm.horizontal());
image.setDotsPerMeterY(dpm.vertical());
}
/*======================= LoadFileTask::ErrorResult ======================*/
LoadFileTask::ErrorResult::ErrorResult(QString const& file_path)
: m_filePath(QDir::toNativeSeparators(file_path))
, m_fileExists(QFile::exists(file_path))
{
}
void
LoadFileTask::ErrorResult::updateUI(FilterUiInterface* ui)
{
class ErrWidget : public ErrorWidget
{
public:
ErrWidget(IntrusivePtr<AbstractCommand0<void> > const& relinking_dialog_requester,
QString const& text, Qt::TextFormat fmt = Qt::AutoText)
: ErrorWidget(text, fmt), m_ptrRelinkingDialogRequester(relinking_dialog_requester) {}
private:
virtual void linkActivated(QString const&) {
(*m_ptrRelinkingDialogRequester)();
}
IntrusivePtr<AbstractCommand0<void> > m_ptrRelinkingDialogRequester;
};
QString err_msg;
Qt::TextFormat fmt = Qt::AutoText;
if (m_fileExists) {
err_msg = tr("The following file could not be loaded:\n%1").arg(m_filePath);
fmt = Qt::PlainText;
} else {
err_msg = tr(
"The following file doesn't exist:<br>%1<br>"
"<br>"
"Use the <a href=\"#relink\">Relinking Tool</a> to locate it."
).arg(Qt::escape(m_filePath));
fmt = Qt::RichText;
}
ui->setImageWidget(new ErrWidget(ui->relinkingDialogRequester(), err_msg, fmt), ui->TRANSFER_OWNERSHIP);
ui->setOptionsWidget(new FilterOptionsWidget, ui->TRANSFER_OWNERSHIP);
}