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%D \module
%D [ file=s-fonts-kerns,
%D version=2018.02.20, % was s-fnt-40 (given the kin dof code < 2010)
%D title=\CONTEXT\ Style File,
%D subtitle=Show Fonts Kerns,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D This is real old code but we keep it around for educational purposes. it's
%D not that efficient and we have better ways.
%D
%D \starttyping
%D \showfontkerns
%D \stoptyping
%D
%D This one shows all kerns so it's s bit different and as we use it in the
%D manual \unknown
\startluacode
local nodecodes = nodes.nodecodes
local disc_code = nodecodes.disc
local kern_code = nodecodes.kern
local glyph_code = nodecodes.glyph
local hlist_code = nodecodes.hlist
-- local function flatten(l)
-- while l do
-- local id = l.id
-- if id == disc_code then
-- local r = l.replace
-- if r then
-- local p = l.prev
-- local n = l.next
-- if n and p and n.id == glyph_code and p.id == glyph_code then
-- local s = node.slide(r)
-- p.next = r
-- n.prev = s
-- r.prev = p
-- s.next= n
-- l.replace = nil
-- node.free(l)
-- end
-- end
-- elseif id == hlist_code then
-- flatten(l.list)
-- end
-- l = l.next
-- end
-- end
local function mark(l,c)
while l do
local id = l.id
if id == kern_code then
context.showkern(l.kern,c)
elseif id == disc_code then
mark(l.pre,2)
mark(l.post,3)
mark(l.replace,4)
elseif id == hlist_code then
mark(l.list,c)
end
l = l.next
end
end
local function collect(l)
local m = { }
while l do
local id = l.id
if id == hlist_code then
m[#m+1] = l
end
l = l.next
end
return m
end
local function inject(l,m,i)
local x = l
i = i or 0
while l do
local id = l.id
if id == kern_code then
i = i + 1
node.insert_before(x,l,node.copy(m[i]))
elseif id == disc_code then
i = inject(l.pre,m,i)
i = inject(l.post,m,i)
i = inject(l.replace,m,i)
elseif id == hlist_code then
i = inject(l.list,m,i)
end
l = l.next
end
return i
end
moduledata.fonts = moduledata.fonts or { }
moduledata.fonts.kerns = moduledata.fonts.kerns or { }
function moduledata.fonts.kerns._show_(n)
inject(tex.box[n].list,collect(tex.box[6].list))
end
function moduledata.fonts.kerns.show(n)
context("\\bgroup")
context("\\setbox6\\vbox\\bgroup\\forgetall")
-- flatten(tex.box[n].list)
mark(tex.box[n].list,1)
context("\\egroup")
context("\\ctxlua{moduledata.fonts.kerns._show_('%s')}",n)
context("\\egroup")
end
\stopluacode
\setupcolors[state=start]
\definefont[VerySmall][Mono at 4pt]
\definecolor[kern:0][s=.5]
\definecolor[kern:1][b=.5]
\definecolor[kern:2][r=.5]
\definecolor[kern:3][g=.5]
\definecolor[kern:4][r=.5,g=.5]
\def\showkernwidthfactor{1}
\newconditional\showkernstate
\settrue \showexplicitkerns
\unexpanded\def\showkern#1#2%
{\begingroup
\dontcomplain
\setbox\scratchbox\hbox to \zeropoint \bgroup
\ifcase#2\or
\ifconditional\showkernstate
\color[kern:0]{\dovlwdhtdp\showkernwidthfactor{0.75}{0.5}}%
\global\setfalse\showkernstate
\raise.8\strutht
\else
\color[kern:0]{\dovlwdhtdp\showkernwidthfactor{1.05}{0.5}}%
\global\settrue\showkernstate
\raise1.1\strutht
\fi
\else\ifconditional\showexplicitkerns % if other kerns
\color[kern:0]{\dovlwdhtdp\showkernwidthfactor{0.75}{0.5}}%
\lower1.2\strutdp
\fi\fi
\hbox to 0pt{\hss\VerySmall\color[kern:#2]{\expandafter\withoutpt\the\dimexpr#1sp}\hss}%
\egroup
\smashbox\scratchbox
\box\scratchbox
\endgroup
\par}
\newbox\KernBox
\unexpanded\def\ShowKerns#1%
{\global\setfalse
\showkernstate\ctxlua{moduledata.fonts.kerns.show("#1")}}
\unexpanded\def\ShowKernedVBox#1%
{\global\setfalse\showkernstate
\setbox\KernBox\vbox{#1}%
\ShowKerns{KernBox}%
\unvbox\KernBox}
\unexpanded\def\ShowKernedHBox#1%
{\global\setfalse\showkernstate
\setbox\KernBox\hbox{#1}%
\ShowKerns{KernBox}%
\unhbox\KernBox}
\continueifinputfile{s-fonts-kerns.mkiv}
\setupinterlinespace[1.5] % \setfalse\showexplicitkerns
\definefontfeature[default][default][mode=node] % ,script=latn]
\starttext
% \enabletrackers[otf.kerns]
\setuplayout[width=middle,height=middle]
\usetypescript[modern] \setupbodyfont[modern]
\setbox\KernBox\vbox{\input knuth } \ShowKerns{KernBox} \copy\KernBox \blank
\ShowKernedHBox{Very often glyphs get very small spaces inserted horizontally.}
\usetypescript[cambria] \setupbodyfont[cambria]
\setbox\KernBox\vbox{\input knuth } \ShowKerns{KernBox} \copy\KernBox \blank
\ShowKernedHBox{Very often glyphs get very small spaces inserted horizontally.}
\usetypescript[palatino] \setupbodyfont[palatino]
\setbox\KernBox\vbox{\input knuth } \ShowKerns{KernBox} \copy\KernBox \blank
\ShowKernedHBox{Very often glyphs get very small spaces inserted horizontally.}
\usetypescript[dejavu] \setupbodyfont[dejavu]
\setbox\KernBox\vbox{\input knuth } \ShowKerns{KernBox} \copy\KernBox \blank
\ShowKernedHBox{Very often glyphs get very small spaces inserted horizontally.}
\stoptext
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