From 0b0256403b7e111df0ecdb8ca589f20df787dacd Mon Sep 17 00:00:00 2001
From: Hans Hagen <pragma@wxs.nl>
Date: Tue, 10 Mar 2020 15:42:39 +0100
Subject: 2020-03-10 14:47:00

---
 tex/context/base/mkiv/font-lib.mkvi | 42 +++++++++++++++++++++++++++++++++----
 1 file changed, 38 insertions(+), 4 deletions(-)

(limited to 'tex/context/base/mkiv/font-lib.mkvi')

diff --git a/tex/context/base/mkiv/font-lib.mkvi b/tex/context/base/mkiv/font-lib.mkvi
index 8953c9b32..b3cade5ff 100644
--- a/tex/context/base/mkiv/font-lib.mkvi
+++ b/tex/context/base/mkiv/font-lib.mkvi
@@ -24,8 +24,6 @@
 \registerctxluafile{font-cid}{}         % cid maps
 \registerctxluafile{font-map}{optimize}
 
-% the otf font loader:
-
 % helpers
 
 \registerctxluafile{font-otr}{optimize} % opentype fontloader
@@ -118,6 +116,7 @@
 \registerctxluafile{font-imp-italics}{}
 \registerctxluafile{font-imp-dimensions}{}
 \registerctxluafile{font-imp-spacekerns}{}
+\registerctxluafile{font-imp-tweaks}{}
 
 \doifelsefileexists{font-imp-scripts.lua} {
     \registerctxluafile{font-imp-scripts}{}
@@ -175,6 +174,41 @@
     \setbox\zerocount\hpack{\typethreemacro}%
     \setbox\zerocount\hpack{\raise\dp\zerocount\box\zerocount}%
 }
-
-
 \protect \endinput
+
+% Some simple test with an upgraded data handling. Because in the
+% end most users will use lmtx we can sacrifice some performance
+% in mkiv unless I decide to ship different ots files. The gain
+% in lmtx is hard to determine but the fact that it runs about
+% as fast as luametatex looks quite ok, given the fact that the
+% backend has a significant performance hit. (We're talking of
+% two changes actually, also the state handling got changed which
+% has a bit more impact on lmtx.)
+%
+% \starttext \start
+%
+% Performance can be better in luatex when I decide to backport
+% but it is somewhat context (font) specific which contradicts
+% the fact that we don't want to add package specific features
+% to the engines (which in the end could hurt the other packages)
+% so that might never happen.
+%
+% latin modern (fastest time):
+%
+% old: luatex 2.979 | luametatex 3.198
+% new: luatex 3.399 | luametatex 3.198
+%
+% % \setupbodyfont[pagella] \smallcaps
+%
+% pagella (fastest time):
+%
+% old: luatex 5.098 | luametatex 5.104
+% new: luatex 6.178 | luametatex 4.975
+%
+% \testfeatureonce{1000}{\samplefile{tufte}\par}
+%
+% \page \elapsedtime \stop \stoptext
+%
+% In then end this upgrade was rejected and the experimental code
+% was thrashed (pending possible future lmtx specific variants of
+% font-*.lua).
-- 
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