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if not modules then modules = { } end modules ['font-fbk'] = {
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 cos, tan, rad, format = math.cos, math.tan, math.rad, string.format
local utfbyte, utfchar = utf.byte, utf.char
local trace_combining = false trackers.register("fonts.combining", function(v) trace_combining = v end)
local trace_combining_all = false trackers.register("fonts.combining.all", function(v) trace_combining_all = v end)
local force_combining = false -- just for demo purposes (see mk)
trackers.register("fonts.composing", "fonts.combining")
local report_combining = logs.reporter("fonts","combining")
local allocate = utilities.storage.allocate
--[[ldx--
<p>This is very experimental code!</p>
--ldx]]--
local fonts = fonts
local handlers = fonts.handlers
local constructors = fonts.constructors
local vf = handlers.vf
local commands = vf.combiner.commands
local otffeatures = constructors.newfeatures("otf")
local registerotffeature = otffeatures.register
local afmfeatures = constructors.newfeatures("afm")
local registerafmfeature = afmfeatures.register
local unicodecharacters = characters.data
local unicodefallbacks = characters.fallbacks
local push = vf.predefined.push
local pop = vf.predefined.pop
local force_composed = false
local cache = { } -- we could make these weak
local fraction = 0.15 -- 30 units for lucida
local function composecharacters(tfmdata)
-- this assumes that slot 1 is self, there will be a proper self some day
local characters = tfmdata.characters
local descriptions = tfmdata.descriptions
local parameters = tfmdata.parameters
local properties = tfmdata.properties
local Xdesc = descriptions[utfbyte("X")]
local xdesc = descriptions[utfbyte("x")]
if Xdesc and xdesc then
local scale = parameters.factor or 1
local deltaxheight = scale * (Xdesc.boundingbox[4] - xdesc.boundingbox[4])
local extraxheight = fraction * deltaxheight -- maybe use compose value
local italicfactor = parameters.italicfactor or 0
local vfspecials = backends.tables.vfspecials --brr
local red, green, blue, black
if trace_combining then
red = vfspecials.red
green = vfspecials.green
blue = vfspecials.blue
black = vfspecials.black
end
local compose = fonts.goodies.getcompositions(tfmdata)
if compose and trace_combining then
report_combining("using compose information from goodies file")
end
local done = false
for i,c in next, unicodecharacters do -- loop over all characters ... not that efficient but a specials hash takes memory
if force_combining or not characters[i] then
local s = c.specials
if s and s[1] == 'char' then
local chr = s[2]
local charschr = characters[chr]
if charschr then
local cc = c.category
if cc == 'll' or cc == 'lu' or cc == 'lt' then -- characters.is_letter[cc]
local acc = s[3]
local t = { }
for k, v in next, charschr do
if k ~= "commands" then
t[k] = v
end
end
local charsacc = characters[acc]
--~ local ca = charsacc.category
--~ if ca == "mn" then
--~ -- mark nonspacing
--~ elseif ca == "ms" then
--~ -- mark spacing combining
--~ elseif ca == "me" then
--~ -- mark enclosing
--~ else
if not charsacc then -- fallback accents
acc = unicodefallbacks[acc]
charsacc = acc and characters[acc]
end
local chr_t = cache[chr]
if not chr_t then
chr_t = {"slot", 1, chr}
cache[chr] = chr_t
end
if charsacc then
if trace_combining_all then
report_combining("%s (0x%05X) = %s (0x%05X) + %s (0x%05X)",utfchar(i),i,utfchar(chr),chr,utfchar(acc),acc)
end
local acc_t = cache[acc]
if not acc_t then
acc_t = {"slot", 1, acc}
cache[acc] = acc_t
end
local cb = descriptions[chr].boundingbox
local ab = descriptions[acc].boundingbox
-- todo: adapt height
if cb and ab then
-- can be sped up for scale == 1
local c_llx, c_lly, c_urx, c_ury = scale*cb[1], scale*cb[2], scale*cb[3], scale*cb[4]
local a_llx, a_lly, a_urx, a_ury = scale*ab[1], scale*ab[2], scale*ab[3], scale*ab[4]
local dx = (c_urx - a_urx - a_llx + c_llx)/2
local dd = (c_urx - c_llx)*italicfactor
if a_ury < 0 then
if trace_combining then
t.commands = { push, {"right", dx-dd}, red, acc_t, black, pop, chr_t }
else
t.commands = { push, {"right", dx-dd}, acc_t, pop, chr_t }
end
elseif c_ury > a_lly then -- messy test
local dy
if compose then
-- experimental: we could use sx but all that testing
-- takes time and code
dy = compose[i]
if dy then
dy = dy.DY
end
if not dy then
dy = compose[acc]
if dy then
dy = dy and dy.DY
end
end
if not dy then
dy = compose.DY
end
if not dy then
dy = - deltaxheight + extraxheight
elseif dy > -1.5 and dy < 1.5 then
-- we assume a fraction of (percentage)
dy = - dy * deltaxheight
else
-- we assume fontunits (value smaller than 2 make no sense)
dy = - dy * scale
end
else
dy = - deltaxheight + extraxheight
end
if trace_combining then
t.commands = { push, {"right", dx+dd}, {"down", dy}, green, acc_t, black, pop, chr_t }
else
t.commands = { push, {"right", dx+dd}, {"down", dy}, acc_t, pop, chr_t }
end
else
if trace_combining then
t.commands = { push, {"right", dx+dd}, blue, acc_t, black, pop, chr_t }
else
t.commands = { push, {"right", dx+dd}, acc_t, pop, chr_t }
end
end
else
t.commands = { chr_t } -- else index mess
end
else
if trace_combining_all then
report_combining("%s (0x%05X) = %s (0x%05X) (simplified)",utfchar(i),i,utfchar(chr),chr)
end
t.commands = { chr_t } -- else index mess
end
done = true
characters[i] = t
local d = { }
for k, v in next, descriptions[chr] do
d[k] = v
end
descriptions[i] = d
end
end
end
end
end
if done then
properties.virtualized = true
end
end
end
registerotffeature {
name = "compose",
description = "additional composed characters",
manipulators = {
base = composecharacters,
node = composecharacters,
}
}
registerafmfeature {
name = "compose",
description = "additional composed characters",
manipulators = {
base = composecharacters,
node = composecharacters,
}
}
vf.helpers.composecharacters = composecharacters
-- This installs the builder into the regular virtual font builder,
-- which only makes sense as demo.
commands["compose.trace.enable"] = function()
trace_combining = true
end
commands["compose.trace.disable"] = function()
trace_combining = false
end
commands["compose.force.enable"] = function()
force_combining = true
end
commands["compose.force.disable"] = function()
force_combining = false
end
commands["compose.trace.set"] = function(g,v)
if v[2] == nil then
trace_combining = true
else
trace_combining = v[2]
end
end
commands["compose.apply"] = function(g,v)
composecharacters(g)
end
-- vf builder
-- {'special', 'pdf: q ' .. s .. ' 0 0 '.. s .. ' 0 0 cm'},
-- {'special', 'pdf: q 1 0 0 1 ' .. -w .. ' ' .. -h .. ' cm'},
-- {'special', 'pdf: /Fm\XX\space Do'},
-- {'special', 'pdf: Q'},
-- {'special', 'pdf: Q'},
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