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OpenBoard/src/adaptors/UBThumbnailAdaptor.cpp

214 lines
6.3 KiB

13 years ago
/*
* 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 "UBThumbnailAdaptor.h"
#include <QtCore>
#include "frameworks/UBFileSystemUtils.h"
#include "core/UBPersistenceManager.h"
#include "core/UBApplication.h"
#include "core/UBSettings.h"
#include "document/UBDocumentProxy.h"
#include "domain/UBGraphicsScene.h"
#include "UBSvgSubsetAdaptor.h"
#include "core/memcheck.h"
QList<QPixmap> UBThumbnailAdaptor::load(UBDocumentProxy* proxy)
{
QList<QPixmap> thumbnails;
if (!proxy || proxy->persistencePath().size() == 0)
return thumbnails;
//compatibility with older formats (<= 4.0.b.2.0) : generate missing thumbnails
int existingPageCount = proxy->pageCount();
QString thumbFileName = proxy->persistencePath() +
UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", existingPageCount);
QFile thumbFile(thumbFileName);
if (!thumbFile.exists())
{
bool displayMessage = (existingPageCount > 5);
int thumbCount = 0;
for(int i = 0 ; i < existingPageCount; i++)
{
UBGraphicsScene* scene = UBSvgSubsetAdaptor::loadScene(proxy, i);
if (scene)
{
thumbCount++;
if (displayMessage && thumbCount == 1)
UBApplication::showMessage(QObject::tr("Generating preview thumbnails ..."));
persistScene(proxy->persistencePath(), scene, i);
}
}
if (displayMessage && thumbCount > 0)
UBApplication::showMessage(QObject::tr("%1 thumbnails generated ...").arg(thumbCount));
}
//end compatibility with older format
bool moreToProcess = true;
int pageCount = 0;
while (moreToProcess) {
pageCount++;
QString fileName = proxy->persistencePath() +
UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", pageCount);
QFile file(fileName);
if (file.exists()) {
QPixmap pix;
//Warning. Works only with modified Qt
#ifdef Q_WS_X11
pix.load(fileName, 0, Qt::AutoColor);
#else
pix.load(fileName, 0, Qt::AutoColor, false);
#endif
thumbnails.append(pix);
} else {
moreToProcess = false;
}
}
return thumbnails;
}
QPixmap UBThumbnailAdaptor::load(UBDocumentProxy* proxy, int index)
{
int existingPageCount = proxy->pageCount();
if (!proxy || proxy->persistencePath().size() == 0 || index < 0 || index >= existingPageCount)
return QPixmap();
//compatibility with older formats (<= 4.0.b.2.0) : generate missing thumbnails
QString thumbFileName = proxy->persistencePath() +
UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", existingPageCount);
QFile thumbFile(thumbFileName);
if (!thumbFile.exists())
{
bool displayMessage = (existingPageCount > 5);
int thumbCount = 0;
for(int i = 0 ; i < existingPageCount; i++)
{
UBGraphicsScene* scene = UBSvgSubsetAdaptor::loadScene(proxy, i);
if (scene)
{
thumbCount++;
if (displayMessage && thumbCount == 1)
UBApplication::showMessage(QObject::tr("Generating preview thumbnails ..."));
persistScene(proxy->persistencePath(), scene, i);
}
}
if (displayMessage && thumbCount > 0)
UBApplication::showMessage(QObject::tr("%1 thumbnails generated ...").arg(thumbCount));
}
//end compatibility with older format
QString fileName = proxy->persistencePath() +
UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", index + 1);
QFile file(fileName);
if (file.exists())
{
QPixmap pix;
//Warning. Works only with modified Qt
#ifdef Q_WS_X11
pix.load(fileName, 0, Qt::AutoColor);
#else
pix.load(fileName, 0, Qt::AutoColor, false);
#endif
return pix;
}
return QPixmap();
}
void UBThumbnailAdaptor::persistScene(const QString& pDocPath, UBGraphicsScene* pScene, int pageIndex, bool overrideModified)
{
QString fileName = pDocPath + UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", pageIndex + 1);
QFile thumbFile(fileName);
if (pScene->isModified() || overrideModified || !thumbFile.exists())
{
qreal nominalWidth = pScene->nominalSize().width();
qreal nominalHeight = pScene->nominalSize().height();
qreal ratio = nominalWidth / nominalHeight;
QRectF sceneRect = pScene->normalizedSceneRect(ratio);
qreal width = UBSettings::maxThumbnailWidth;
qreal height = width / ratio;
QImage thumb(width, height, QImage::Format_ARGB32);
QRectF imageRect(0, 0, width, height);
QPainter painter(&thumb);
painter.setRenderHint(QPainter::Antialiasing, true);
painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
if (pScene->isDarkBackground())
{
painter.fillRect(imageRect, Qt::black);
}
else
{
painter.fillRect(imageRect, Qt::white);
}
pScene->setRenderingContext(UBGraphicsScene::NonScreen);
pScene->setRenderingQuality(UBItem::RenderingQualityHigh);
pScene->render(&painter, imageRect, sceneRect, Qt::KeepAspectRatio);
pScene->setRenderingContext(UBGraphicsScene::Screen);
pScene->setRenderingQuality(UBItem::RenderingQualityNormal);
thumb.scaled(width, height, Qt::KeepAspectRatio, Qt::SmoothTransformation).save(fileName, "JPG");
}
}
QUrl UBThumbnailAdaptor::thumbnailUrl(UBDocumentProxy* proxy, int pageIndex)
{
QString fileName = proxy->persistencePath() +
UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", pageIndex + 1);
return QUrl::fromLocalFile(fileName);
}