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DocPage Organizer: Preview image painting

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This commit is contained in:
Jakub Melka
2021-07-25 18:00:08 +02:00
parent 4570b12359
commit 7cc02ae51c
5 changed files with 111 additions and 5 deletions
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82
Pdf4QtDocPageOrganizer/pageitemdelegate.cpp
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@@ -19,8 +19,10 @@
#include "pageitemmodel.h"
#include "pdfwidgetutils.h"
#include "pdfpainterutils.h"
#include "pdfrenderer.h"
#include <QPainter>
#include <QPixmapCache>
namespace pdfdocpage
{
@@ -62,9 +64,18 @@ void PageItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& opti
QSize pageImageSize = rotatedPageSize.scaled(pageBoundingRect.size(), Qt::KeepAspectRatio).toSize();
QRect pageImageRect(pageBoundingRect.topLeft() + QPoint((pageBoundingRect.width() - pageImageSize.width()) / 2, (pageBoundingRect.height() - pageImageSize.height()) / 2), pageImageSize);
painter->setPen(QPen(Qt::black));
painter->setBrush(Qt::white);
painter->drawRect(pageImageRect);
QPixmap pageImagePixmap = getPageImagePixmap(item, pageImageRect);
if (!pageImagePixmap.isNull())
{
painter->drawPixmap(pageImageRect, pageImagePixmap);
}
painter->setPen(QPen(Qt::black));
painter->setBrush(Qt::NoBrush);
painter->drawRect(pageImageRect);
}
int textOffset = pageBoundingRect.bottom() + verticalSpacing;
@@ -122,4 +133,73 @@ void PageItemDelegate::setPageImageSize(QSize pageImageSize)
}
}
QPixmap PageItemDelegate::getPageImagePixmap(const PageGroupItem* item, QRect rect) const
{
QPixmap pixmap;
Q_ASSERT(item);
if (item->groups.empty())
{
return pixmap;
}
const PageGroupItem::GroupItem& groupItem = item->groups.front();
if (groupItem.pageType == PT_Empty)
{
return pixmap;
}
// Jakub Melka: generate key and see, if pixmap is not cached
QString key = QString("%1#%2#%3#%4#%5@%6x%7").arg(groupItem.documentIndex).arg(groupItem.imageIndex).arg(int(groupItem.pageAdditionalRotation)).arg(groupItem.pageIndex).arg(groupItem.pageType).arg(rect.width()).arg(rect.height());
if (!QPixmapCache::find(key, &pixmap))
{
// We must draw the pixmap
pixmap = QPixmap(rect.width(), rect.height());
pixmap.fill(Qt::transparent);
switch (groupItem.pageType)
{
case pdfdocpage::PT_DocumentPage:
break;
case pdfdocpage::PT_Image:
{
const auto& images = m_model->getImages();
auto it = images.find(groupItem.imageIndex);
if (it != images.cend())
{
const QImage& image = it->second.image;
if (!image.isNull())
{
QRect drawRect(QPoint(0, 0), rect.size());
QRect mediaBox(QPoint(0, 0), image.size());
QMatrix matrix = pdf::PDFRenderer::createMediaBoxToDevicePointMatrix(mediaBox, drawRect, groupItem.pageAdditionalRotation);
QPainter painter(&pixmap);
painter.setWorldMatrixEnabled(true);
painter.setWorldMatrix(matrix);
painter.translate(0, mediaBox.height());
painter.scale(1.0, -1.0);
painter.drawImage(0, 0, image);
}
}
break;
}
case pdfdocpage::PT_Empty:
Q_ASSERT(false);
break;
default:
Q_ASSERT(false);
break;
}
QPixmapCache::insert(key, pixmap);
}
return pixmap;
}
} // namespace pdfdocpage