Remove caching of old ImageDecoder objects.

This breaks things when there is a 3D ImageContent.  When
you change the video frame type on this content the view
does not update because the re-used ImageDecoder recycles
the same video without noticing that the frame type has changed.

I guess this is sort of `because' the video frame type is used
in VideoDecoder::give, which sets up the cache.

Unfortunately I can't remember the case which the caching
of ImageDecoders was meant to speed up.  Maybe this will
now become apparent.

3 files changed, 3 insertions, 25 deletions

diff --git a/src/lib/decoder_factory.cc b/src/lib/decoder_factory.cc
index 7f53c9a4b..dc01a043a 100644
--- a/src/lib/decoder_factory.cc
+++ b/src/lib/decoder_factory.cc
@@ -37,7 +37,7 @@ using boost::shared_ptr;
 using boost::dynamic_pointer_cast;
 
 shared_ptr<Decoder>
-decoder_factory (shared_ptr<const Content> content, list<shared_ptr<ImageDecoder> > old_image_decoders, shared_ptr<Log> log, bool fast)
+decoder_factory (shared_ptr<const Content> content, shared_ptr<Log> log, bool fast)
 {
 	shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (content);
 	if (fc) {
@@ -51,20 +51,7 @@ decoder_factory (shared_ptr<const Content> content, list<shared_ptr<ImageDecoder
 
 	shared_ptr<const ImageContent> ic = dynamic_pointer_cast<const ImageContent> (content);
 	if (ic) {
-		shared_ptr<Decoder> decoder;
-
-		/* See if we can re-use an old ImageDecoder */
-		BOOST_FOREACH (shared_ptr<ImageDecoder> i, old_image_decoders) {
-			if (i->content() == ic) {
-				decoder = i;
-			}
-		}
-
-		if (!decoder) {
-			decoder.reset (new ImageDecoder (ic, log));
-		}
-
-		return decoder;
+		return shared_ptr<Decoder> (new ImageDecoder (ic, log));
 	}
 
 	shared_ptr<const TextSubtitleContent> rc = dynamic_pointer_cast<const TextSubtitleContent> (content);
diff --git a/src/lib/decoder_factory.h b/src/lib/decoder_factory.h
index 6a4e55ef1..52a53afd2 100644
--- a/src/lib/decoder_factory.h
+++ b/src/lib/decoder_factory.h
@@ -22,7 +22,6 @@ class ImageDecoder;
 
 extern boost::shared_ptr<Decoder> decoder_factory (
 	boost::shared_ptr<const Content> content,
-	std::list<boost::shared_ptr<ImageDecoder> > old_image_decoders,
 	boost::shared_ptr<Log> log,
 	bool fast
 	);
diff --git a/src/lib/player.cc b/src/lib/player.cc
index d437d5b1b..f22a6480f 100644
--- a/src/lib/player.cc
+++ b/src/lib/player.cc
@@ -115,14 +115,6 @@ Player::Player (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist
 void
 Player::setup_pieces ()
 {
-	list<shared_ptr<ImageDecoder> > old_image_decoders;
-	BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
-		shared_ptr<ImageDecoder> imd = dynamic_pointer_cast<ImageDecoder> (i->decoder);
-		if (imd) {
-			old_image_decoders.push_back (imd);
-		}
-	}
-
 	_pieces.clear ();
 
 	BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
@@ -131,7 +123,7 @@ Player::setup_pieces ()
 			continue;
 		}
 
-		shared_ptr<Decoder> decoder = decoder_factory (i, old_image_decoders, _film->log(), _fast);
+		shared_ptr<Decoder> decoder = decoder_factory (i, _film->log(), _fast);
 		FrameRateChange frc (i->active_video_frame_rate(), _film->video_frame_rate());
 
 		if (!decoder) {