diff options
Diffstat (limited to 'tex/context/base/mkxl/font-con.lmt')
| -rw-r--r-- | tex/context/base/mkxl/font-con.lmt | 75 |
1 files changed, 30 insertions, 45 deletions
diff --git a/tex/context/base/mkxl/font-con.lmt b/tex/context/base/mkxl/font-con.lmt index 073af7d2e..5a887d61d 100644 --- a/tex/context/base/mkxl/font-con.lmt +++ b/tex/context/base/mkxl/font-con.lmt @@ -22,11 +22,9 @@ local trace_scaling = false trackers.register("fonts.scaling", function(v) local report_defining = logs.reporter("fonts","defining") --- watch out: no negative depths and negative eights permitted in regular fonts - ---[[ldx-- -<p>Here we only implement a few helper functions.</p> ---ldx]]-- +-- Watch out: no negative depths and negative heights are permitted in regular +-- fonts. Also, the code in LMTX is a bit different. Here we only implement a +-- few helper functions. local fonts = fonts local constructors = fonts.constructors or { } @@ -53,11 +51,9 @@ constructors.loadedfonts = loadedfonts ----- scalecommands = fonts.helpers.scalecommands ---[[ldx-- -<p>We need to normalize the scale factor (in scaled points). This has to -do with the fact that <l n='tex'/> uses a negative multiple of 1000 as -a signal for a font scaled based on the design size.</p> ---ldx]]-- +-- We need to normalize the scale factor (in scaled points). This has to do with the +-- fact that TeX uses a negative multiple of 1000 as a signal for a font scaled +-- based on the design size. local factors = { pt = 65536.0, @@ -112,33 +108,29 @@ function constructors.getmathparameter(tfmdata,name) end end ---[[ldx-- -<p>Beware, the boundingbox is passed as reference so we may not overwrite it -in the process; numbers are of course copies. Here 65536 equals 1pt. (Due to -excessive memory usage in CJK fonts, we no longer pass the boundingbox.)</p> ---ldx]]-- - --- The scaler is only used for otf and afm and virtual fonts. If a virtual font has italic --- correction make sure to set the hasitalics flag. Some more flags will be added in the --- future. - ---[[ldx-- -<p>The reason why the scaler was originally split, is that for a while we experimented -with a helper function. However, in practice the <l n='api'/> calls are too slow to -make this profitable and the <l n='lua'/> based variant was just faster. A days -wasted day but an experience richer.</p> ---ldx]]-- +-- Beware, the boundingbox is passed as reference so we may not overwrite it in the +-- process; numbers are of course copies. Here 65536 equals 1pt. (Due to excessive +-- memory usage in CJK fonts, we no longer pass the boundingbox.) +-- +-- The scaler is only used for OTF and AFM and virtual fonts. If a virtual font has +-- italic correction make sure to set the hasitalics flag. Some more flags will be +-- added in the future. +-- +-- The reason why the scaler was originally split, is that for a while we +-- experimented with a helper function. However, in practice the API calls are too +-- slow to make this profitable and the Lua based variant was just faster. A days +-- wasted day but an experience richer. -- experimental, sharing kerns (unscaled and scaled) saves memory -- local sharedkerns, basekerns = constructors.check_base_kerns(tfmdata) -- loop over descriptions (afm and otf have descriptions, tfm not) -- there is no need (yet) to assign a value to chr.tonunicode - +-- -- constructors.prepare_base_kerns(tfmdata) -- optimalization - --- we have target.name=metricfile and target.fullname=RealName and target.filename=diskfilename --- when collapsing fonts, luatex looks as both target.name and target.fullname as ttc files --- can have multiple subfonts +-- +-- We have target.name = metricfile and target.fullname = RealName and +-- target.filename = diskfilename when collapsing fonts. LuaTeX looks at both +-- target.name and target.fullname because TTC files can have multiple subfonts. function constructors.calculatescale(tfmdata,scaledpoints) -- implemented in font-ctx.lmt @@ -1008,9 +1000,7 @@ function constructors.finalize(tfmdata) return tfmdata end ---[[ldx-- -<p>A unique hash value is generated by:</p> ---ldx]]-- +-- A unique hash value is generated by: local hashmethods = { } constructors.hashmethods = hashmethods @@ -1069,13 +1059,11 @@ hashmethods.normal = function(list) end end ---[[ldx-- -<p>In principle we can share tfm tables when we are in need for a font, but then -we need to define a font switch as an id/attr switch which is no fun, so in that -case users can best use dynamic features ... so, we will not use that speedup. Okay, -when we get rid of base mode we can optimize even further by sharing, but then we -loose our testcases for <l n='luatex'/>.</p> ---ldx]]-- +-- In principle we can share tfm tables when we are in need for a font, but then we +-- need to define a font switch as an id/attr switch which is no fun, so in that +-- case users can best use dynamic features ... so, we will not use that speedup. +-- Okay, when we get rid of base mode we can optimize even further by sharing, but +-- then we loose our testcases for LuaTeX. function constructors.hashinstance(specification,force) -- implemented in font-ctx.lmt @@ -1407,10 +1395,7 @@ do end ---[[ldx-- -<p>We need to check for default features. For this we provide -a helper function.</p> ---ldx]]-- +-- We need to check for default features. For this we provide a helper function. function constructors.checkedfeatures(what,features) local defaults = handlers[what].features.defaults |