From: DRC <dcommander@users.sourceforge.net>
Date: Tue, 8 Feb 2011 18:10:24 +0000 (+0000)
Subject: libjpeg-turbo produces about the same image quality with the fast integer DCT if... 
X-Git-Tag: v1.0.90~60
X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=27198cecda2903a59d3a3c5e75682d14b1f35a05;p=tigervnc.git

libjpeg-turbo produces about the same image quality with the fast integer DCT if the JPEG quality is <= 95, and it's a lot faster.  Slow integer DCT is retained for quality >= 96, because fast integer degrades at those quality levels.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4259 3789f03b-4d11-0410-bbf8-ca57d06f2519
---

diff --git a/common/rfb/tightEncode.h b/common/rfb/tightEncode.h
index 0c6b364c..2e6d0d88 100644
--- a/common/rfb/tightEncode.h
+++ b/common/rfb/tightEncode.h
@@ -574,6 +574,8 @@ static void ENCODE_JPEG_RECT (rdr::OutStream *os, PIXEL_T *buf,
 
   jpeg_set_defaults(&cinfo);
   jpeg_set_quality(&cinfo, s_pjconf->jpegQuality, TRUE);
+  if(s_pjconf->jpegQuality >= 96) cinfo.dct_method = JDCT_ISLOW;
+  else cinfo.dct_method = JDCT_FASTEST;
 
   switch (s_pjconf->jpegSubSample) {
   case SUBSAMP_420: