1 files changed, 217 insertions, 0 deletions
diff --git a/src/gvcore/slideshow.cpp b/src/gvcore/slideshow.cpp
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+++ b/src/gvcore/slideshow.cpp
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+// vim: set tabstop=4 shiftwidth=4 noexpandtab
+// kate: indent-mode csands; indent-width 4; replace-tabs-save off; replace-tabs off; replace-trailing-space-save off; space-indent off; tabs-indents on; tab-width 4;
+/*
+Gwenview - A simple image viewer for KDE
+Copyright 2000-2004 Aur�ien G�eau
+
+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 2
+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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+// STL
+#include <algorithm>
+
+// Qt
+#include <qtimer.h>
+
+// KDE
+#include <kconfig.h>
+#include <kdebug.h>
+
+// Local
+#include <../gvcore/slideshowconfig.h>
+#include "slideshow.moc"
+
+#include "document.h"
+#include "imageloader.h"
+#include "cache.h"
+
+namespace Gwenview {
+
+#undef ENABLE_LOG
+#undef LOG
+//#define ENABLE_LOG
+#ifdef ENABLE_LOG
+#define LOG(x) kdDebug() << k_funcinfo << x << endl
+#else
+#define LOG(x) ;
+#endif
+
+SlideShow::SlideShow(Document* document)
+: mDocument(document), mStarted(false), mPrefetch( NULL ) {
+	mTimer=new QTimer(this);
+	connect(mTimer, SIGNAL(timeout()),
+			this, SLOT(slotTimeout()) );
+	connect(mDocument, SIGNAL(loaded(const KURL&)),
+			this, SLOT(slotLoaded()) );
+}
+
+SlideShow::~SlideShow() {
+	if( !mPriorityURL.isEmpty()) Cache::instance()->setPriorityURL( mPriorityURL, false );
+}
+
+
+void SlideShow::slotSettingsChanged() {
+	if (mTimer->isActive()) {
+		mTimer->changeInterval(timerInterval());
+	}
+}
+
+
+int SlideShow::timerInterval() {
+	int documentDuration = mDocument->duration();
+	if (documentDuration != 0) {
+		return documentDuration * 1000;
+	} else {
+		return int(SlideShowConfig::delay()*1000);
+	}
+}
+
+
+void SlideShow::start(const KURL::List& urls) {
+	mURLs.resize(urls.size());
+	qCopy(urls.begin(), urls.end(), mURLs.begin());
+	if (SlideShowConfig::random()) {
+		std::random_shuffle(mURLs.begin(), mURLs.end());
+	}
+
+	mStartIt=qFind(mURLs.begin(), mURLs.end(), mDocument->url());
+	if (mStartIt==mURLs.end()) {
+		kdWarning() << k_funcinfo << "Current URL not found in list, aborting.\n";
+		return;
+	}
+	
+	mTimer->start(timerInterval(), true);
+	mStarted=true;
+	prefetch();
+	emit stateChanged(true);
+}
+
+
+void SlideShow::stop() {
+	mTimer->stop();
+	mStarted=false;
+	emit stateChanged(false);
+	if( !mPriorityURL.isEmpty()) {
+		Cache::instance()->setPriorityURL( mPriorityURL, false );
+		mPriorityURL = KURL();
+	}
+}
+
+
+QValueVector<KURL>::ConstIterator SlideShow::findNextURL() const {
+	QValueVector<KURL>::ConstIterator it=qFind(mURLs.begin(), mURLs.end(), mDocument->url());
+	if (it==mURLs.end()) {
+		kdWarning() << k_funcinfo << "Current URL not found in list. This should not happen.\n";
+		return it;
+	}
+
+	++it;
+	if (SlideShowConfig::loop()) {
+		// Looping, if we reach the end, start again
+		if (it==mURLs.end()) {
+			it = mURLs.begin();
+		}
+	} else {
+		// Not looping, have we reached the end?
+		if ((it==mURLs.end() && SlideShowConfig::stopAtEnd()) || it==mStartIt) {
+			it = mURLs.end();
+		}
+	}
+
+	return it;
+}
+
+
+void SlideShow::slotTimeout() {
+	LOG("");
+	// wait for prefetching to finish
+	if( mPrefetch != NULL ) {
+		LOG("mPrefetch is working");
+		return;
+	}
+
+	QValueVector<KURL>::ConstIterator it=findNextURL();
+	if (it==mURLs.end()) {
+		stop();
+		return;
+	}
+	emit nextURL(*it);
+}
+
+
+void SlideShow::slotLoaded() {
+	if (mStarted) {
+		mTimer->start(timerInterval(), true);
+		prefetch();
+	}
+}
+
+
+void SlideShow::prefetch() {
+	LOG("");
+	QValueVector<KURL>::ConstIterator it=findNextURL();
+	if (it==mURLs.end()) {
+		return;
+	}
+	LOG("url=" << (*it).pathOrURL());
+
+	if( mPrefetch != NULL ) mPrefetch->release( this );
+	// TODO don't use prefetching with disabled optimizations (and add that option ;) )
+	// (and also don't use prefetching in other places if the image won't fit in cache)
+	mPrefetch = ImageLoader::loader( *it, this, BUSY_PRELOADING );
+	if( !mPriorityURL.isEmpty()) Cache::instance()->setPriorityURL( mPriorityURL, false );
+	mPriorityURL = *it;
+	Cache::instance()->setPriorityURL( mPriorityURL, true ); // make sure it will stay in the cache
+	connect( mPrefetch, SIGNAL( urlKindDetermined()), SLOT( slotUrlKindDetermined()));
+	connect( mPrefetch, SIGNAL( imageLoaded( bool )), SLOT( prefetchDone()));
+	
+	if (mPrefetch->urlKind()==MimeTypeUtils::KIND_FILE) {
+		// Prefetch is already done, and this is not a raster image
+		prefetchDone();
+	}
+}
+
+void SlideShow::slotUrlKindDetermined() {
+	LOG("");
+	if (!mPrefetch) return;
+	
+	LOG("mPrefetch!=0");
+	if (mPrefetch->urlKind()==MimeTypeUtils::KIND_FILE) {
+		LOG("KIND_FILE");
+		// This is not a raster image, imageLoaded will not be emitted
+		prefetchDone();
+	}
+}
+
+
+void SlideShow::prefetchDone() {
+	LOG("");
+	if( mPrefetch != NULL ) { 
+		LOG("mPrefetch!=0");
+		// don't call Cache::setPriorityURL( ... , false ) here - it will still take
+		// a short while to reuse the image from the cache
+		mPrefetch->release( this );
+		mPrefetch = NULL;
+		// prefetching completed and delay has already elapsed
+		if( mStarted && !mTimer->isActive()) {
+			LOG("Calling slotTimeout");
+			slotTimeout();
+		}
+	}
+}
+
+
+} // namespace