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if not modules then modules = { } end modules ['font-vf'] = {
version = 1.001,
comment = "companion to font-ini.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
--[[ldx--
<p>This is very experimental code! Not yet adapted to recent changes. This will
change.</p>
--ldx]]--
-- define.methods elsewhere !
fonts = fonts or { }
fonts.define = fonts.define or { }
fonts.define.methods = fonts.define.methods or { }
fonts.vf = fonts.vf or { }
fonts.vf.combinations = fonts.vf.combinations or { }
fonts.vf.aux = fonts.vf.aux or { }
fonts.vf.aux.combine = fonts.vf.aux.combine or { }
function fonts.define.methods.install(tag, rules)
fonts.vf.combinations[tag] = rules
fonts.define.methods[tag] = function(specification)
return fonts.vf.combine(specification,tag)
end
end
function fonts.vf.aux.combine.assign(g, name, from, to, start, force)
local f, id = fonts.vf.aux.combine.load(g,name)
if f and id then
-- optimize for whole range, then just g = f
if not from then from, to = 0, 0xFF00 end
if not to then to = from end
if not start then start = from end
local fc, gc = f.characters, g.characters
g.fonts[#g.fonts+1] = { id = id } -- no need to be sparse
local hn = #g.fonts
for i=from,to do
if fc[i] and (force or not gc[i]) then
gc[i] = table.fastcopy(fc[i])
gc[i].commands = { { 'slot', hn, start } }
end
start = start + 1
end
if not g.parameters and #g.fonts > 0 then -- share this code !
g.parameters = table.fastcopy(f.parameters)
g.italicangle = f.italicangle
g.ascender = f.ascender
g.descender = f.descender
end
end
end
function fonts.vf.aux.combine.process(g,list)
if list then
for _,v in pairs(list) do
(fonts.vf.aux.combine.commands[v[1]] or nop)(g,v)
end
end
end
function fonts.vf.aux.combine.load(g,name)
return fonts.tfm.read_and_define(name or g.specification.name,g.specification.size)
end
function fonts.vf.aux.combine.names(g,name,force)
local f, id = fonts.tfm.read_and_define(name,g.specification.size)
if f and id then
local fc, gc = f.characters, g.characters
g.fonts[#g.fonts+1] = { id = id } -- no need to be sparse
local hn = #g.fonts
for k, v in pairs(fc) do
if force or not gc[k] then
gc[k] = table.fastcopy(v)
gc[k].commands = { { 'slot', hn, k } }
end
end
if not g.parameters and #g.fonts > 0 then -- share this code !
g.parameters = table.fastcopy(f.parameters)
g.italicangle = f.italicangle
g.ascender = f.ascender
g.descender = f.descender
end
end
end
fonts.vf.aux.combine.commands = {
["initialize"] = function(g,v) fonts.vf.aux.combine.assign (g,g.name) end,
["include-method"] = function(g,v) fonts.vf.aux.combine.process (g,fonts.vf.combinations[v[2]]) end, -- name
["copy-parameters"] = function(g,v) fonts.vf.aux.combine.parameters(g,v[2]) end, -- name
["copy-range"] = function(g,v) fonts.vf.aux.combine.assign (g,v[2],v[3],v[4],v[5],true) end, -- name, from-start, from-end, to-start
["copy-char"] = function(g,v) fonts.vf.aux.combine.assign (g,v[2],v[3],v[3],v[4],true) end, -- name, from, to
["fallback-range"] = function(g,v) fonts.vf.aux.combine.assign (g,v[2],v[3],v[4],v[5],false) end, -- name, from-start, from-end, to-start
["fallback-char"] = function(g,v) fonts.vf.aux.combine.assign (g,v[2],v[3],v[3],v[4],false) end, -- name, from, to
["copy_names"] = function(g,v) fonts.vf.aux.combine.names (g,v[2],true) end,
["fallback_names"] = function(g,v) fonts.vf.aux.combine.names (g,v[2],false) end,
}
function fonts.vf.combine(specification,tag)
local g = {
name = specification.name,
type = 'virtual',
fonts = { },
characters = { },
specification = table.fastcopy(specification)
}
fonts.vf.aux.combine.process(g,fonts.vf.combinations[tag])
return g
end
fonts.vf.aux.combine.commands["feature"] = function(g,v)
local key, value = v[2], v[3]
if key then
if value == nil then
value = true
end
if g.specification and g.specification.features.normal then
g.specification.features.normal[key] = value -- otf?
end
end
end
-- simple example with features
fonts.define.methods.install(
"ligatures", {
{ "feature", "liga" } ,
{ "feature", "dlig" } ,
{ "initialize" } ,
}
)
--~ fonts.define.methods.install (
--~ "ligatures-x", {
--~ { "feature", "liga" } ,
--~ { "feature", "dlig" } ,
--~ { "initialize" } ,
--~ { "lineheight" }
--~ }
--~ )
--~ fonts.define.methods.install(
--~ "lmsymbol10", {
--~ { "fallback_names", "lmsy10.afm" } ,
--~ { "fallback_names", "msam10.afm" } ,
--~ { "fallback_names", "msbm10.afm" }
--~ }
--~ )
--~ \font\TestFont=dummy@lmsymbol10 at 24pt
-- docu case
--~ fonts.define.methods.install(
--~ "weird", {
--~ { "copy-range", "lmroman10-regular" } ,
--~ { "copy-char", "lmroman10-regular", 65, 66 } ,
--~ { "copy-range", "lmsans10-regular", 0x0100, 0x01FF } ,
--~ { "copy-range", "lmtypewriter10-regular", 0x0200, 0xFF00 } ,
--~ { "fallback-range", "lmtypewriter10-regular", 0x0000, 0x0200 }
--~ }
--~ )
-- demo case -> move to module
fonts.define.methods["demo-1"] = function(specification)
local name = specification.name -- symbolic name
local size = specification.size -- given size
--~ specification.name = 'lmroman10-regular' -- forced base name
--~ specification.features.vtf = { }
local f, id = fonts.tfm.read_and_define('lmroman10-regular',size)
if f and id then
local capscale, digscale = 0.85, 0.75
f.name, f.type = name, 'virtual'
f.fonts = {
{id=id},
{name='lmsans10-regular' , size=size*capscale}, -- forced extra name
{name='lmtypewriter10-regular', size=size*digscale} -- forced extra name
}
for k,v in pairs(f.characters) do
local u = v.unicode
if u and characters.i_is_of_category(u,'lu') then
v.width = capscale*v.width
v.commands = {
{'special','pdf: 1 0 0 rg'},
{'slot',2, k},
{'special','pdf: 0 g'},
}
elseif u and characters.i_is_of_category(u,'nd') then
v.width = digscale*v.width
v.commands = {
{'special','pdf: 0 0 1 rg'},
{'slot',3,k},
{'special','pdf: 0 g'},
}
else
v.commands = {
{'special','pdf: 0 1 0 rg'},
{'slot',1,k},
{'special','pdf: 0 g'},
}
end
end
end
return f
end
-- keep as example, now tfm feature
--~ fonts.vf.aux.combine.commands["lineheight"] = function(g,v)
--~ if g.ascender and g.descender then
--~ local ht, dp = g.ascender or 0, g.descender or 0
--~ if v[2] == "none" then
--~ for _,v in pairs(g.characters) do
--~ v.height = 0
--~ v.depth = 0
--~ end
--~ else
--~ if v[2] == "height" then
--~ dp = 0
--~ elseif v[2] == "depth" then
--~ ht = 0
--~ end
--~ if ht > 0 then
--~ if dp > 0 then
--~ for _,v in pairs(g.characters) do
--~ v.height = ht
--~ v.depth = dp
--~ end
--~ else
--~ for _,v in pairs(g.characters) do
--~ v.height = ht
--~ end
--~ end
--~ elseif dp > 0 then
--~ for _,v in pairs(g.characters) do
--~ v.depth = dp
--~ end
--~ end
--~ end
--~ end
--~ end
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