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if not modules then modules = { } end modules ['font-vf'] = {
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"
}
--[[ldx--
<p>This is very experimental code! Not yet adapted to recent
changes. This will change.</p>
--ldx]]--
-- define.methods elsewhere !
local next = next
local fastcopy = table.fastcopy
local fonts = fonts
local vf = fonts.vf
local tfm = fonts.tfm
fonts.define = fonts.define or { }
local define = fonts.define
define.methods = define.methods or { }
vf.combinations = vf.combinations or { }
vf.aux = vf.aux or { }
vf.aux.combine = vf.aux.combine or { }
local combine = vf.aux.combine
function define.methods.install(tag, rules)
vf.combinations[tag] = rules
define.methods[tag] = function(specification)
return vf.combine(specification,tag)
end
end
local function combine_load(g,name)
return tfm.read_and_define(name or g.specification.name,g.specification.size)
end
local function combine_assign(g, name, from, to, start, force)
local f, id = 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
local fd, gd = f.descriptions, g.descriptions
local hn = #g.fonts+1
g.fonts[hn] = { id = id } -- no need to be sparse
for i=from,to do
if fc[i] and (force or not gc[i]) then
gc[i] = fastcopy(fc[i]) -- can be optimized
gc[i].commands = { { 'slot', hn, start } }
gd[i] = fd[i]
end
start = start + 1
end
if not g.parameters and #g.fonts > 0 then -- share this code !
g.parameters = fastcopy(f.parameters)
g.italicangle = f.italicangle
g.ascender = f.ascender
g.descender = f.descender
g.factor = f.factor -- brrr
end
end
end
local function combine_process(g,list)
if list then
for _,v in next, list do
(combine.commands[v[1]] or nop)(g,v)
end
end
end
local function combine_names(g,name,force)
local f, id = tfm.read_and_define(name,g.specification.size)
if f and id then
local fc, gc = f.characters, g.characters
local fd, gd = f.descriptions, g.descriptions
g.fonts[#g.fonts+1] = { id = id } -- no need to be sparse
local hn = #g.fonts
for k, v in next, fc do
if force or not gc[k] then
gc[k] = fastcopy(v)
gc[k].commands = { { 'slot', hn, k } }
gd[i] = fd[i]
end
end
if not g.parameters and #g.fonts > 0 then -- share this code !
g.parameters = fastcopy(f.parameters)
g.italicangle = f.italicangle
g.ascender = f.ascender
g.descender = f.descender
g.factor = f.factor -- brrr
end
end
end
local combine_feature = function(g,v)
local key, value = v[2], v[3]
if key then
if value == nil then
value = true
end
local specification = g.specification
if specification then
local normalfeatures = specification.features.normal
if normalfeatures then
normalfeatures[key] = value -- otf?
end
end
end
end
--~ combine.load = combine_load
--~ combine.assign = combine_assign
--~ combine.process = combine_process
--~ combine.names = combine_names
--~ combine.feature = combine_feature
combine.commands = {
["initialize"] = function(g,v) combine_assign (g,g.name) end,
["include-method"] = function(g,v) combine_process (g,vf.combinations[v[2]]) end, -- name
-- ["copy-parameters"] = function(g,v) combine_parameters(g,v[2]) end, -- name
["copy-range"] = function(g,v) 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) combine_assign (g,v[2],v[3],v[3],v[4],true) end, -- name, from, to
["fallback-range"] = function(g,v) 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) combine_assign (g,v[2],v[3],v[3],v[4],false) end, -- name, from, to
["copy-names"] = function(g,v) combine_names (g,v[2],true) end,
["fallback_names"] = function(g,v) combine_names (g,v[2],false) end,
["feature"] = combine_feature,
}
function vf.combine(specification,tag)
local g = {
name = specification.name,
-- type = 'virtual',
virtualized = true,
fonts = { },
characters = { },
descriptions = { },
specification = fastcopy(specification),
}
combine_process(g,vf.combinations[tag])
return g
end
-- simple example with features
define.methods.install(
"ligatures", {
{ "feature", "liga" } ,
{ "feature", "dlig" } ,
{ "initialize" } ,
}
)
--~ define.methods.install (
--~ "ligatures-x", {
--~ { "feature", "liga" } ,
--~ { "feature", "dlig" } ,
--~ { "initialize" } ,
--~ { "lineheight" }
--~ }
--~ )
--~ define.methods.install(
--~ "lmsymbol10", {
--~ { "fallback_names", "lmsy10.afm" } ,
--~ { "fallback_names", "msam10.afm" } ,
--~ { "fallback_names", "msbm10.afm" }
--~ }
--~ )
--~ \font\TestFont=dummy@lmsymbol10 at 24pt
-- docu case
--~ 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
-- todo: interface tables in back-ini
define.methods["demo-1"] = function(specification)
local name = specification.name -- symbolic name
local size = specification.size -- given size
local f, id = 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.name, f.virtualized = name, true
f.fonts = {
{ id = id },
{ name = 'lmsans10-regular' , size = size*capscale }, -- forced extra name
{ name = 'lmtypewriter10-regular', size = size*digscale } -- forced extra name
}
local i_is_of_category = characters.i_is_of_category
local characters, descriptions = f.characters, f.descriptions
local vfspecials = backends.tables.vfspecials
local red, green, blue, black = vfspecials.red, vfspecials.green, vfspecials.blue, vfspecials.black
for u,v in next, characters do
if u and i_is_of_category(u,'lu') then
v.width = capscale*v.width
v.commands = { red, { 'slot', 2, u }, black }
elseif u and i_is_of_category(u,'nd') then
v.width = digscale*v.width
v.commands = { blue, { 'slot', 3, u }, black }
else
v.commands = { green, { 'slot', 1, u }, black }
end
end
end
return f
end
|
