Add flags to control zlib compression level (fixes #113)

1 files changed, 14 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index cdfa3fce..915d73f8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,22 @@
 2019-08-23  Jay Berkenbilt  <ejb@ql.org>
 
+	* Add --recompress-streams option to qpdf and
+	QPDFWriter::setRecompressFlate to cause QPDFWriter to recompress
+	streams that are already compressed with /FlateDecode.
+
 	* Add option Pl_Flate::setCompressionLevel to globally set the
 	zlib compression level used by all Pl_Flate pipelines.
 
+	* Add --compression-level flag to qpdf to set the zlib compression
+	level. When combined with --recompress-flate, this will cause most
+	of qpdf's streams to use the maximum compression level. This
+	results in only a very small amount of savings in size that comes
+	at a fairly significant performance cost, but it could be useful
+	for archival files or other cases where every byte counts and
+	creation time doesn't matter so much. Note that using
+	--object-streams=generate in combination with these options gives
+	you the biggest advantage. Fixes #113.
+
 2019-08-22  Jay Berkenbilt  <ejb@ql.org>
 
 	* In QPDFObjectHandle::ParserCallbacks, in addition to