118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
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// vim: set tabstop=4 shiftwidth=4 expandtab:
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/*
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Gwenview: an image viewer
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Copyright 2008 Aurélien Gâteau <agateau@kde.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
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*/
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// Self
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#include "preloader.h"
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// Qt
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// KF
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// Local
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#include "gwenview_app_debug.h"
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#include <lib/document/documentfactory.h>
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namespace Gwenview
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{
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#undef ENABLE_LOG
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#undef LOG
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// #define ENABLE_LOG
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#ifdef ENABLE_LOG
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#define LOG(x) qCDebug(GWENVIEW_APP_LOG) << x
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#else
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#define LOG(x) ;
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#endif
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struct PreloaderPrivate {
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Preloader *q = nullptr;
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Document::Ptr mDocument;
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QSize mSize;
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void forgetDocument()
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{
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// Forget about the document. Keeping a reference to it would prevent it
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// from being garbage collected.
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QObject::disconnect(mDocument.data(), nullptr, q, nullptr);
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mDocument = nullptr;
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}
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};
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Preloader::Preloader(QObject *parent)
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: QObject(parent)
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, d(new PreloaderPrivate)
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{
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d->q = this;
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}
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Preloader::~Preloader()
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{
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delete d;
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}
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void Preloader::preload(const QUrl &url, const QSize &size)
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{
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LOG("url=" << url);
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if (d->mDocument) {
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disconnect(d->mDocument.data(), nullptr, this, nullptr);
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}
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d->mDocument = DocumentFactory::instance()->load(url);
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d->mSize = size;
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connect(d->mDocument.data(), &Document::metaInfoUpdated, this, &Preloader::doPreload);
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if (d->mDocument->size().isValid()) {
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LOG("size is already available");
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doPreload();
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}
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}
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void Preloader::doPreload()
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{
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if (!d->mDocument) {
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return;
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}
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if (d->mDocument->loadingState() == Document::LoadingFailed) {
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LOG("loading failed");
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d->forgetDocument();
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return;
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}
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if (!d->mDocument->size().isValid()) {
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LOG("size not available yet");
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return;
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}
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qreal zoom = qMin(d->mSize.width() / qreal(d->mDocument->width()), d->mSize.height() / qreal(d->mDocument->height()));
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if (zoom < Document::maxDownSampledZoom()) {
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LOG("preloading down sampled, zoom=" << zoom);
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d->mDocument->prepareDownSampledImageForZoom(zoom);
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} else {
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LOG("preloading full image");
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d->mDocument->startLoadingFullImage();
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}
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d->forgetDocument();
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}
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} // namespace
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#include "moc_preloader.cpp"
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