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Issue #107: Loading images

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This commit is contained in:
Jakub Melka
2023-11-16 19:40:00 +01:00
parent 908fb47af1
commit fc44dfa4bc
5 changed files with 100 additions and 14 deletions
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79
Pdf4QtViewer/pdfcreatebitonaldocumentdialog.cpp
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@ -20,26 +20,35 @@
#include "pdfwidgetutils.h"
#include "pdfdocumentwriter.h"
#include "pdfimage.h"
#include "pdfdbgheap.h"
#include "pdfexception.h"
#include <QCheckBox>
#include <QPushButton>
#include <QElapsedTimer>
#include <QtConcurrent/QtConcurrent>
#include <QListWidget>
namespace pdfviewer
{
PDFCreateBitonalDocumentDialog::PDFCreateBitonalDocumentDialog(const pdf::PDFDocument* document, QWidget* parent) :
PDFCreateBitonalDocumentDialog::PDFCreateBitonalDocumentDialog(const pdf::PDFDocument* document,
const pdf::PDFCMS* cms,
QWidget* parent) :
QDialog(parent),
ui(new Ui::PDFCreateBitonalDocumentDialog),
m_document(document),
m_cms(cms),
m_createBitonalDocumentButton(nullptr),
m_conversionInProgress(false),
m_processed(false)
{
ui->setupUi(this);
m_classifier.classify(document);
m_imageReferences = m_classifier.getObjectsByType(pdf::PDFObjectClassifier::Image);
m_createBitonalDocumentButton = ui->buttonBox->addButton(tr("Process"), QDialogButtonBox::ActionRole);
connect(m_createBitonalDocumentButton, &QPushButton::clicked, this, &PDFCreateBitonalDocumentDialog::onCreateBitonalDocumentButtonClicked);
connect(ui->automaticThresholdRadioButton, &QRadioButton::clicked, this, &PDFCreateBitonalDocumentDialog::updateUi);
@ -48,6 +57,8 @@ PDFCreateBitonalDocumentDialog::PDFCreateBitonalDocumentDialog(const pdf::PDFDoc
pdf::PDFWidgetUtils::scaleWidget(this, QSize(640, 380));
updateUi();
pdf::PDFWidgetUtils::style(this);
loadImages();
}
PDFCreateBitonalDocumentDialog::~PDFCreateBitonalDocumentDialog()
@ -73,6 +84,72 @@ void PDFCreateBitonalDocumentDialog::onCreateBitonalDocumentButtonClicked()
updateUi();
}
void PDFCreateBitonalDocumentDialog::loadImages()
{
QSize iconSize(QSize(256, 256));
ui->imageListWidget->setIconSize(iconSize);
QSize imageSize = iconSize * ui->imageListWidget->devicePixelRatioF();
pdf::PDFCMSGeneric genericCms;
for (pdf::PDFObjectReference reference : m_imageReferences)
{
std::optional<pdf::PDFImage> pdfImage;
pdf::PDFObject imageObject = m_document->getObjectByReference(reference);
pdf::PDFRenderErrorReporterDummy errorReporter;
if (!imageObject.isStream())
{
// Image is not stream
continue;
}
const pdf::PDFStream* stream = imageObject.getStream();
try
{
pdf::PDFColorSpacePointer colorSpace;
const pdf::PDFDictionary* streamDictionary = stream->getDictionary();
if (streamDictionary->hasKey("ColorSpace"))
{
const pdf::PDFObject& colorSpaceObject = m_document->getObject(streamDictionary->get("ColorSpace"));
if (colorSpaceObject.isName() || colorSpaceObject.isArray())
{
pdf::PDFDictionary dummyDictionary;
colorSpace = pdf::PDFAbstractColorSpace::createColorSpace(&dummyDictionary, m_document, colorSpaceObject);
}
}
pdfImage.emplace(pdf::PDFImage::createImage(m_document,
stream,
colorSpace,
false,
pdf::RenderingIntent::Perceptual,
&errorReporter));
}
catch (pdf::PDFException)
{
continue;
}
QImage image = pdfImage->getImage(&genericCms, &errorReporter, nullptr);
if (image.isNull())
{
continue;
}
QListWidgetItem* item = new QListWidgetItem(ui->imageListWidget);
QWidget* widget = new QWidget;
QHBoxLayout* layout = new QHBoxLayout(widget);
QCheckBox* checkbox = new QCheckBox(widget);
layout->addWidget(checkbox);
image = image.scaled(imageSize.width(), imageSize.height(), Qt::KeepAspectRatio, Qt::FastTransformation);
item->setIcon(QIcon(QPixmap::fromImage(image)));
ui->imageListWidget->setItemWidget(item, widget);
}
}
void PDFCreateBitonalDocumentDialog::updateUi()
{
ui->thresholdEditBox->setEnabled(ui->manualThresholdRadioButton->isChecked());