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if not modules then modules = { } end modules ['font-vfc'] = {
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"
}
local select, type = select, type
local insert = table.insert
local fonts = fonts
local helpers = fonts.helpers
local setmetatableindex = table.setmetatableindex
----- makeweak = table.makeweak
-- Helpers dealing with virtual fonts: beware, these are final values so
-- don't change the content of tables fetched from here!
local pushcommand = { "push" }
local popcommand = { "pop" }
local dummycommand = { "comment" }
local slotcommand = setmetatableindex(function(t,k)
local v = setmetatableindex(function(tt,kk)
local vv = { "slot", k, kk }
tt[kk] = vv
return vv
end)
t[k] = v
return v
end)
function helpers.prependcommands(commands,...)
insert(commands,1,pushcommand)
for i=select("#",...),1,-1 do
local s = (select(i,...))
if s then
insert(commands,1,s)
end
end
insert(commands,popcommand)
return commands
end
function helpers.appendcommands(commands,...)
insert(commands,1,pushcommand)
insert(commands,popcommand)
for i=1,select("#",...) do
local s = (select(i,...))
if s then
insert(commands,s)
end
end
return commands
end
function helpers.prependcommandtable(commands,t)
insert(commands,1,pushcommand)
for i=#t,1,-1 do
local s = t[i]
if s then
insert(commands,1,s)
end
end
insert(commands,popcommand)
return commands
end
function helpers.appendcommandtable(commands,t)
insert(commands,1,pushcommand)
insert(commands,popcommand)
for i=1,#t do
local s = t[i]
if s then
insert(commands,s)
end
end
return commands
end
helpers.commands = utilities.storage.allocate {
char = setmetatableindex(function(t,k) local v = { "char", k } t[k] = v return v end),
stay = setmetatableindex(function(t,k) local v = { "stay", k } t[k] = v return v end),
right = setmetatableindex(function(t,k) local v = { "right", k } t[k] = v return v end),
left = setmetatableindex(function(t,k) local v = { "left", k } t[k] = v return v end),
down = setmetatableindex(function(t,k) local v = { "down", k } t[k] = v return v end),
up = setmetatableindex(function(t,k) local v = { "up", k } t[k] = v return v end),
push = pushcommand,
pop = popcommand,
dummy = dummycommand,
slot = slotcommand,
}
local codeinjections = backends.codeinjections
local vfstartcolor = codeinjections.vfstartcolor
local vfstopcolor = codeinjections.vfstopcolor
----- vfliteral = codeinjections.vfliteral
helpers.vfinjectors = {
-- startcolor = function(h,v,packet) codeinjections.vfstartcolor(h,v,packet) end,
-- stopcolor = function(h,v,packet) codeinjections.vfstartcolor(h,v,packet) end,
-- literal = function(h,v,packet) codeinjections.vfliteral (h,v,packer) end,
startcolor = function(h,v,packet) vfstartcolor(h,v,packet) end,
stopcolor = function(h,v,packet) vfstopcolor (h,v,packet) end,
-- literal = function(h,v,packet) vfliteral (h,v,packer) end,
}
updaters.register("backends.injections.latebindings",function()
vfstartcolor = backends.codeinjections.vfstartcolor
vfstopcolor = backends.codeinjections.vfstopcolor
-- vfliteral = backends.codeinjections.vfliteral
end)
-- maybe round()
local defaultline = 16384
helpers.vfspecials = {
backgrounds = setmetatableindex(function(t,h)
local v = setmetatableindex(function(t,d)
local v = setmetatableindex(function(t,w)
local v = { "frame", w, h, d, defaultline, false, false }
t[w] = v
return v
end)
t[d] = v
return v
end)
t[h] = v
return v
end),
outlines = setmetatableindex(function(t,h)
local v = setmetatableindex(function(t,d)
local v = setmetatableindex(function(t,w)
local v = { "frame", w, h, d, defaultline, true, false }
t[w] = v
return v
end)
t[d] = v
return v
end)
t[h] = v
return v
end),
}
-- In the past we only copied when we had something that got scaled but the problem
-- is that we then run into issues when we extend a commands in the parent. This
-- needs checking. When we go to glyph scaling, this can go away.
--
-- The alternative is to work with unscaled values and always do scaling at the
-- TeX end. So, then we need accessors instead of tables and we also need to check
-- all the context code: where do we access values?
--
-- On the other hand, in glyph scale mode we hardly do any scaling so we seldom
-- call the next one.
--
-- What if we use named fields: then we can scale by field name.
local scaled = {
right = true,
down = true,
left = true,
right = true,
offset = true,
rule = true,
char = false,
font = false,
slot = false,
use = false,
push = false,
pop = false,
lua = false,
-- obsolete
node = false,
-- additional ones are never scaled (color etc)
}
-- normally we don't have these, and if so, only in old school fonts
-- in which case we don't have extensions so ...
function helpers.scalecommands(list,hdelta,vdelta)
local n = #list
for i=1,n do
local cmd = list[i]
if scaled[cmd[1]] then
local result = { }
for i=1,n do
local cmd = list[i]
local key = cmd[1]
if key == "right" or key == "left" then
result[i] = { key, cmd[2]*hdelta }
elseif key == "down" or key == "up" then
result[i] = { key, cmd[2]*vdelta }
elseif key == "offset" then
result[i] = { key, cmd[2]*hdelta, cmd[3]*vdelta, cmd[4], cmd[5], cmd[6] }
elseif key == "rule" then
result[i] = { key, cmd[2]*hdelta, cmd[3]*vdelta }
elseif key == "line" then
result[i] = { key, cmd[2]*hdelta, cmd[3]*vdelta, cmd[4]*vdelta, cmd[5] }
-- elseif key == "frame" then
-- result[i] = cmd -- already scaled, for now
else
result[i] = cmd -- shared since in cache and untouched
end
end
return result
end
end
return list
end
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