File indexing completed on 2025-03-09 03:52:07

 /* ============================================================
  *
  * This file is a part of digiKam project
  * https://www.digikam.org
  *
  * Date        : 2007-11-14
  * Description : a presentation tool.
  *
  * SPDX-FileCopyrightText: 2007-2009 by Valerio Fuoglio <valerio dot fuoglio at gmail dot com>
  * SPDX-FileCopyrightText: 2012-2024 by Gilles Caulier <caulier dot gilles at gmail dot com>
  *
  * Parts of this code are based on smoothslidesaver by Carsten Weinhold
  * <carsten dot weinhold at gmx dot de>
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
  *
  * ============================================================ */
 
 #include "kbimageloader.h"
 
 // Qt includes
 
 #include <QFileInfo>
 
 // Local includes
 
 #include "dimg.h"
 #include "iccmanager.h"
 #include "iccsettings.h"
 #include "digikam_debug.h"
 #include "presentationkb.h"
 #include "previewloadthread.h"
 #include "iccsettingscontainer.h"
 #include "presentationcontainer.h"
 
 using namespace Digikam;
 
 namespace DigikamGenericPresentationPlugin
 {
 
 class Q_DECL_HIDDEN KBImageLoader::Private
 {
 
 public:
 
     explicit Private()
       : sharedData      (nullptr),
         fileIndex       (0),
         width           (0),
         height          (0),
         initialized     (false),
         needImage       (true),
         haveImages      (false),
         quitRequested   (false),
         textureAspect   (0.0)
     {
     }
 
     PresentationContainer* sharedData;
     int                    fileIndex;
 
     int                    width;
     int                    height;
 
     QWaitCondition         imageRequest;
     QMutex                 condLock;
     QMutex                 imageLock;
 
     bool                   initialized;
     bool                   needImage;
     bool                   haveImages;
     bool                   quitRequested;
 
     float                  textureAspect;
     QImage                 texture;
 
     IccProfile             iccProfile;
 };
 
 KBImageLoader::KBImageLoader(PresentationContainer* const sharedData, int width, int height)
     : QThread(),
       d      (new Private)
 {
     d->sharedData = sharedData;
     d->width      = width;
     d->height     = height;
 
     ICCSettingsContainer settings = IccSettings::instance()->settings();
 
     if (settings.enableCM && settings.useManagedPreviews)
     {
         d->iccProfile = IccProfile(IccManager::displayProfile(d->sharedData->display));
     }
 }
 
 KBImageLoader::~KBImageLoader()
 {
     delete d;
 }
 
 void KBImageLoader::quit()
 {
     QMutexLocker locker(&d->condLock);
 
     d->quitRequested = true;
     d->imageRequest.wakeOne();
 }
 
 void KBImageLoader::requestNewImage()
 {
     QMutexLocker locker(&d->condLock);
 
     if (!d->needImage)
     {
         d->needImage = true;
         d->imageRequest.wakeOne();
     }
 }
 
 void KBImageLoader::run()
 {
     QMutexLocker locker(&d->condLock);
 
     // we enter the loop with d->needImage==true, so we will immediately
     // try to load an image
 
     while (true)
     {
         if (d->quitRequested)
         {
             break;
         }
 
         if (d->needImage)
         {
             if (d->fileIndex == (int)d->sharedData->urlList.count())
             {
                 if (d->sharedData->loop)
                 {
                     d->fileIndex = 0;
                 }
                 else
                 {
                     d->needImage  = false;
                     d->haveImages = false;
                     continue;
                 }
             }
 
             d->needImage = false;
             d->condLock.unlock();
             bool ok;
 
             do
             {
                 ok = loadImage();
 
                 if (!ok)
                 {
                     invalidateCurrentImageName();
                 }
             }
             while (!ok && (d->fileIndex < (int)d->sharedData->urlList.count()));
 
             if (d->fileIndex == (int)d->sharedData->urlList.count())
             {
                 d->condLock.lock();
                 continue;
             }
 
             if (!ok)
             {
                 // generate a black dummy image
 
                 d->texture = QImage(128, 128, QImage::Format_ARGB32);
                 d->texture.fill(Qt::black);
             }
 
             d->condLock.lock();
 
             d->fileIndex++;
 
             if (!d->initialized)
             {
                 d->haveImages  = ok;
                 d->initialized = true;
             }
         }
         else
         {
             // wait for new requests from the consumer
 
             d->imageRequest.wait(&d->condLock);
         }
     }
 }
 
 bool KBImageLoader::loadImage()
 {
     QString path  = d->sharedData->urlList[d->fileIndex].toLocalFile();
     QImage  image = PreviewLoadThread::loadHighQualitySynchronously(path,
                                                                     PreviewSettings::RawPreviewAutomatic,
                                                                     d->iccProfile).copyQImage();
 
     if (image.isNull())
     {
         return false;
     }
 
     d->imageLock.lock();
 
     d->textureAspect = (float)image.width() / (float)image.height();
     d->texture       = image.scaled(d->width, d->height,
                                     Qt::KeepAspectRatio, Qt::SmoothTransformation);
 
     d->imageLock.unlock();
 
     return true;
 }
 
 void KBImageLoader::invalidateCurrentImageName()
 {
     d->sharedData->urlList.removeAll(d->sharedData->urlList[d->fileIndex]);
     d->fileIndex++;
 }
 
 bool KBImageLoader::grabImage()
 {
     d->imageLock.lock();
 
     return d->haveImages;
 }
 
 void KBImageLoader::ungrabImage()
 {
     d->imageLock.unlock();
 }
 
 bool KBImageLoader::ready() const
 {
     return d->initialized;
 }
 
 const QImage& KBImageLoader::image() const
 {
     return d->texture;
 }
 
 float KBImageLoader::imageAspect() const
 {
     return d->textureAspect;
 }
 
 } // namespace DigikamGenericPresentationPlugin
 
 #include "moc_kbimageloader.cpp"