119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
// SPDX-License-Identifier: GPL-3.0-only
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/*
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* PolyMC - Minecraft Launcher
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* Copyright (c) 2022 flowln <flowlnlnln@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "VariableSizedImageObject.h"
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#include <QAbstractTextDocumentLayout>
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#include <QDebug>
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#include <QPainter>
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#include <QTextObject>
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#include "Application.h"
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#include "net/NetJob.h"
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enum FormatProperties { ImageData = QTextFormat::UserProperty + 1 };
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QSizeF VariableSizedImageObject::intrinsicSize(QTextDocument* doc, int posInDocument, const QTextFormat& format)
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{
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Q_UNUSED(posInDocument);
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auto image = qvariant_cast<QImage>(format.property(ImageData));
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auto size = image.size();
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// Get the width of the text content to make the image similar sized.
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// doc->textWidth() includes the margin, so we need to remove it.
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auto doc_width = doc->textWidth() - 2 * doc->documentMargin();
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if (size.width() > doc_width)
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size *= doc_width / (double)size.width();
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return { size };
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}
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void VariableSizedImageObject::drawObject(QPainter* painter,
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const QRectF& rect,
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QTextDocument* doc,
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int posInDocument,
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const QTextFormat& format)
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{
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if (!format.hasProperty(ImageData)) {
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QUrl image_url{ qvariant_cast<QString>(format.property(QTextFormat::ImageName)) };
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if (m_fetching_images.contains(image_url))
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return;
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loadImage(doc, image_url, posInDocument);
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return;
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}
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auto image = qvariant_cast<QImage>(format.property(ImageData));
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painter->setRenderHint(QPainter::RenderHint::SmoothPixmapTransform);
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painter->drawImage(rect, image);
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}
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void VariableSizedImageObject::parseImage(QTextDocument* doc, QImage image, int posInDocument)
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{
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QTextCursor cursor(doc);
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cursor.setPosition(posInDocument);
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cursor.setKeepPositionOnInsert(true);
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auto image_char_format = cursor.charFormat();
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image_char_format.setObjectType(QTextFormat::ImageObject);
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image_char_format.setProperty(ImageData, image);
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// Qt doesn't allow us to modify the properties of an existing object in the document.
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// So we remove the old one and add the new one with the ImageData property set.
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cursor.deleteChar();
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cursor.insertText(QString(QChar::ObjectReplacementCharacter), image_char_format);
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}
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void VariableSizedImageObject::loadImage(QTextDocument* doc, const QUrl& source, int posInDocument)
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{
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m_fetching_images.append(source);
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MetaEntryPtr entry = APPLICATION->metacache()->resolveEntry(
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m_meta_entry,
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QString("images/%1").arg(QString(QCryptographicHash::hash(source.toEncoded(), QCryptographicHash::Algorithm::Sha1).toHex())));
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auto job = new NetJob(QString("Load Image: %1").arg(source.fileName()), APPLICATION->network());
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job->addNetAction(Net::Download::makeCached(source, entry));
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auto full_entry_path = entry->getFullPath();
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auto source_url = source;
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connect(job, &NetJob::succeeded, [this, doc, full_entry_path, source_url, posInDocument] {
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qDebug() << "Loaded resource at" << full_entry_path;
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QImage image(full_entry_path);
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doc->addResource(QTextDocument::ImageResource, source_url, image);
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parseImage(doc, image, posInDocument);
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// This size hack is needed to prevent the content from being laid out in an area smaller
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// than the total width available (weird).
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auto size = doc->pageSize();
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doc->adjustSize();
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doc->setPageSize(size);
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m_fetching_images.removeOne(source_url);
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});
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connect(job, &NetJob::finished, job, &NetJob::deleteLater);
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job->start();
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}
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