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if not modules then modules = { } end modules ['font-mpf'] = {
version = 1.001,
comment = "companion to font-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local tonumber, unpack, type = tonumber, unpack, type
local context = context
local metapost = metapost
local metafonts = { }
metapost.metafonts = metafonts
local sortedhash = table.sortedhash
local addcharacters = fonts.constructors.addcharacters
local fontdata = fonts.hashes.identifiers
local otf = fonts.handlers.otf
local otfregister = otf.features.register
local getshapes = fonts.dropins.getshapes
local setparameterset = metapost.setparameterset
local simplemetapost = metapost.simple
local register = fonts.collections.register
local checkenabled = fonts.collections.checkenabled
local newprivateslot = fonts.helpers.newprivateslot
local currentfont = font.current
local function setmetaglyphs(category,fontid,unicode,specification)
if unicode then
local tfmdata = fontdata[fontid]
local characters = tfmdata.characters
specification.unicode = unicode
specification.category = category
-- Generate one shape, make a use we pass the unicode as that is
-- the index in a picture list (normally). We could actually already
-- fetch the stream but for now we do that later (i.e. we delay the
-- serialization to pdf).
local code = specification.code
if code then
setparameterset("mpsfont",specification)
-- simplemetapost(instance,"begingroup;",true,true)
simplemetapost("simplefun",code)
-- simplemetapost(instance,"endgroup;",true,true)
end
-- We now know (hopefully) the dimensions of the image which is what
-- we need to pass to the engine in order to let it do its work.
local shapes = getshapes(category)
local units = shapes.parameters.units
local scale = tfmdata.parameters.size / units
local shape = shapes.glyphs[unicode]
if shape then
--
local llx, lly, urx, ury = unpack(shape.boundingbox)
llx = llx * scale
urx = urx * scale
lly = lly * scale
ury = ury * scale
--
local newdata = { }
characters[unicode] = newdata -- so that we can register commands
fonts.dropins.swapone("mps",tfmdata,shape,unicode)
--
local olddata = characters[unicode]
newdata.width = urx - llx
newdata.height = ury
newdata.depth = -lly
newdata.unicode = unicode
-- commands = { { "offset", -llx, 0, newdata.commands[1][1], newdata.commands[1][2] } }
if llx ~= 0 then
newdata.commands = { { "offset", -llx, 0 }, newdata.commands[1] }
end
-- pass dimensions to lua
characters[unicode] = newdata
-- pass dimensions to tex
addcharacters(fontid, { characters = { [unicode] = newdata } })
return fontid, unicode
else
logs.report("metaglyph", "bad shape %U in font %i", unicode, fontid)
end
end
end
local function setmetaglyph(specification)
if specification then
local category = specification.category
local name = specification.name
if category and name then
local fontid = specification.fontid or currentfont()
local private = newprivateslot(name)
register(fontid,private,function(font,char)
return setmetaglyphs(category,font,char,specification) end
)
checkenabled()
end
end
end
local function initializempf(tfmdata,kind,value)
local metafont = metafonts[value]
if value then
local font = tfmdata.properties.id
for char, spec in sortedhash(metafont) do
if type(char) == "string" then
char = newprivateslot(char)
end
register(font,char,function(font,char)
return setmetaglyphs(value,font,char,spec)
end)
end
checkenabled()
end
end
fonts.helpers.setmetaglyphs = setmetaglyphs
fonts.helpers.setmetaglyph = setmetaglyph
otfregister {
name = "metafont",
description = "metafont glyphs",
manipulators = {
base = initializempf,
node = initializempf,
}
}
do
local scanners = tokens.scanners
local scanopen = scanners.scanopen
local scanclose = scanners.scanclose
local scanword = scanners.word
local scanstring = scanners.string
interfaces.implement {
name = "setmetaglyph",
public = true,
protected = true,
actions = function(t)
local t = { }
if scanopen() then
while not scanclose() do
local key = scanword()
if key == "shapes" then
if scanopen() then
local tt = { }
local nn = 0
while not scanclose() do
if scanopen() then
local ttt = { }
while not scanclose() do
local key = scanword()
ttt[key] = scanstring()
end
nn= nn + 1
tt[nn] = ttt
end
end
t[key] = tt
end
else
t[key] = scanstring()
end
end
end
setmetaglyph(t)
end
}
end
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