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if not modules then modules = { } end modules ['font-imp-dimensions'] = {
version = 1.001,
comment = "companion to font-ini.mkiv and hand-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
if not context then return end
local next, type, tonumber = next, type, tonumber
local fonts = fonts
local utilities = utilities
local helpers = fonts.helpers
local prependcommands = helpers.prependcommands
local charcommand = helpers.commands.char
local rightcommand = helpers.commands.right
local handlers = fonts.handlers
local otf = handlers.otf
local afm = handlers.afm
local registerotffeature = otf.features.register
local registerafmfeature = afm.features.register
local settings_to_array = utilities.parsers.settings_to_array
local gettexdimen = tex.getdimen
-- For Wolfgang Schuster:
--
-- \definefontfeature[thisway][default][script=hang,language=zhs,dimensions={2,2,2}]
-- \definedfont[file:kozminpr6nregular*thisway]
local function initialize(tfmdata,key,value)
if type(value) == "string" and value ~= "" then
local characters = tfmdata.characters
local parameters = tfmdata.parameters
local emwidth = parameters.quad
local exheight = parameters.xheight
local newwidth = false
local newheight = false
local newdepth = false
local newshift = false
if value == "strut" then
newheight = gettexdimen("strutht")
newdepth = gettexdimen("strutdp")
elseif value == "mono" then
newwidth = emwidth
elseif value == "halfmono" then
newwidth = emwidth / 2
else
-- there are fonts out there with no x_height ...
local spec = settings_to_array(value)
newwidth = spec[1]
newheight = spec[2]
newdepth = spec[3]
newshift = spec[4]
local quad = parameters.quad or 0
local ascender = parameters.ascender or 0
local descender = parameters.descender or 0
if newwidth == "max" then
newwidth = quad
else
newwidth = tonumber(newwidth)
if newwidth then
newwidth = newwidth * emwidth
end
end
if newheight == "max" then
newheight = ascender
else
newheight = tonumber(newheight)
if newheight then
newheight = newheight * exheight
end
end
if newdepth == "max" then
newdepth = descender
else
newdepth = tonumber(newdepth)
if newdepth then
newdepth = newdepth * exheight
end
end
if parameters.x_heigth == 0 then
-- maybe a fourth parameter
parameters.x_heigth = (ascender + descender) / 2
end
end
-- todo: hshift too
if newwidth or newheight or newdepth then
for unicode, character in next, characters do
local oldwidth = character.width
local oldheight = character.height
local olddepth = character.depth
local width = newwidth or oldwidth or 0
local height = newheight or oldheight or 0
local depth = newdepth or olddepth or 0
if oldwidth ~= width or oldheight ~= height or olddepth ~= depth then
character.width = width
-- character.advance = oldwidth
character.height = height
character.depth = depth
if oldwidth ~= width then
-- todo: xoffset
local commands = character.commands
local hshift = rightcommand[newshift or ((width - oldwidth) / 2)]
if commands then
character.commands = prependcommands (
commands,
hshift
)
else
character.commands = {
hshift,
charcommand[unicode],
}
end
end
end
end
end
end
end
local specification = {
name = "dimensions",
description = "force dimensions",
manipulators = {
base = initialize,
node = initialize,
}
}
registerotffeature(specification)
registerafmfeature(specification)
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