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if not modules then modules = { } end modules ['font-tfm'] = {
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 next = next
local match = string.match
local trace_defining = false trackers.register("fonts.defining", function(v) trace_defining = v end)
local trace_features = false trackers.register("tfm.features", function(v) trace_features = v end)
local report_defining = logs.reporter("fonts","defining")
local report_tfm = logs.reporter("fonts","tfm loading")
local findbinfile = resolvers.findbinfile
local fonts = fonts
local handlers = fonts.handlers
local readers = fonts.readers
local constructors = fonts.constructors
local encodings = fonts.encodings
local tfm = constructors.newhandler("tfm")
tfm.version = 1.000
tfm.maxnestingdepth = 5
tfm.maxnestingsize = 65536*1024
local tfmfeatures = constructors.newfeatures("tfm")
local registertfmfeature = tfmfeatures.register
constructors.resolvevirtualtoo = false -- wil be set in font-ctx.lua
fonts.formats.tfm = "type1" -- we need to have at least a value here
fonts.formats.ofm = "type1" -- we need to have at least a value here
--[[ldx--
<p>The next function encapsulates the standard <l n='tfm'/> loader as
supplied by <l n='luatex'/>.</p>
--ldx]]--
-- this might change: not scaling and then apply features and do scaling in the
-- usual way with dummy descriptions but on the other hand .. we no longer use
-- tfm so why bother
-- ofm directive blocks local path search unless set; btw, in context we
-- don't support ofm files anyway as this format is obsolete
-- we need to deal with nested virtual fonts, but because we load in the
-- frontend we also need to make sure we don't nest too deep (esp when sizes
-- get large)
--
-- (VTITLE Example of a recursion)
-- (MAPFONT D 0 (FONTNAME recurse)(FONTAT D 2))
-- (CHARACTER C A (CHARWD D 1)(CHARHT D 1)(MAP (SETRULE D 1 D 1)))
-- (CHARACTER C B (CHARWD D 2)(CHARHT D 2)(MAP (SETCHAR C A)))
-- (CHARACTER C C (CHARWD D 4)(CHARHT D 4)(MAP (SETCHAR C B)))
--
-- we added the same checks as below to the luatex engine
function tfm.setfeatures(tfmdata,features)
local okay = constructors.initializefeatures("tfm",tfmdata,features,trace_features,report_tfm)
if okay then
return constructors.collectprocessors("tfm",tfmdata,features,trace_features,report_tfm)
else
return { } -- will become false
end
end
local depth = { } -- table.setmetatableindex("number")
local function read_from_tfm(specification)
local filename = specification.filename
local size = specification.size
depth[filename] = (depth[filename] or 0) + 1
if trace_defining then
report_defining("loading tfm file %a at size %s",filename,size)
end
local tfmdata = font.read_tfm(filename,size) -- not cached, fast enough
if tfmdata then
local features = specification.features and specification.features.normal or { }
local resources = tfmdata.resources or { }
local properties = tfmdata.properties or { }
local parameters = tfmdata.parameters or { }
local shared = tfmdata.shared or { }
properties.name = tfmdata.name
properties.fontname = tfmdata.fontname
properties.psname = tfmdata.psname
properties.filename = specification.filename
properties.format = fonts.formats.tfm -- better than nothing
parameters.size = size
--
tfmdata.properties = properties
tfmdata.resources = resources
tfmdata.parameters = parameters
tfmdata.shared = shared
--
shared.rawdata = { }
shared.features = features
shared.processes = next(features) and tfm.setfeatures(tfmdata,features) or nil
parameters.slant = parameters.slant or parameters[1] or 0
parameters.space = parameters.space or parameters[2] or 0
parameters.space_stretch = parameters.space_stretch or parameters[3] or 0
parameters.space_shrink = parameters.space_shrink or parameters[4] or 0
parameters.x_height = parameters.x_height or parameters[5] or 0
parameters.quad = parameters.quad or parameters[6] or 0
parameters.extra_space = parameters.extra_space or parameters[7] or 0
--
constructors.enhanceparameters(parameters) -- official copies for us
--
if constructors.resolvevirtualtoo then
fonts.loggers.register(tfmdata,file.suffix(filename),specification) -- strange, why here
local vfname = findbinfile(specification.name, 'ovf')
if vfname and vfname ~= "" then
local vfdata = font.read_vf(vfname,size) -- not cached, fast enough
if vfdata then
local chars = tfmdata.characters
for k,v in next, vfdata.characters do
chars[k].commands = v.commands
end
properties.virtualized = true
tfmdata.fonts = vfdata.fonts
tfmdata.type = "virtual" -- else nested calls with cummulative scaling
local fontlist = vfdata.fonts
local name = file.nameonly(filename)
for i=1,#fontlist do
local n = fontlist[i].name
local s = fontlist[i].size
local d = depth[filename]
s = constructors.scaled(s,vfdata.designsize)
if d > tfm.maxnestingdepth then
report_defining("too deeply nested virtual font %a with size %a, max nesting depth %s",n,s,tfm.maxnestingdepth)
fontlist[i] = { id = 0 }
elseif (d > 1) and (s > tfm.maxnestingsize) then
report_defining("virtual font %a exceeds size %s",n,s)
fontlist[i] = { id = 0 }
else
local t, id = fonts.constructors.readanddefine(n,s)
fontlist[i] = { id = id }
end
end
end
end
end
--
local allfeatures = tfmdata.shared.features or specification.features.normal
constructors.applymanipulators("tfm",tfmdata,allfeatures.normal,trace_features,report_tfm)
if not features.encoding then
local encoding, filename = match(properties.filename,"^(.-)%-(.*)$") -- context: encoding-name.*
if filename and encoding and encodings.known and encodings.known[encoding] then
features.encoding = encoding
end
end
-- let's play safe:
properties.haskerns = true
properties.hasligatures = true
resources.unicodes = { }
resources.lookuptags = { }
--
depth[filename] = depth[filename] - 1
return tfmdata
else
depth[filename] = depth[filename] - 1
end
end
local function check_tfm(specification,fullname) -- we could split up like afm/otf
local foundname = findbinfile(fullname, 'tfm') or ""
if foundname == "" then
foundname = findbinfile(fullname, 'ofm') or "" -- not needed in context
end
if foundname == "" then
foundname = fonts.names.getfilename(fullname,"tfm") or ""
end
if foundname ~= "" then
specification.filename = foundname
specification.format = "ofm"
return read_from_tfm(specification)
elseif trace_defining then
report_defining("loading tfm with name %a fails",specification.name)
end
end
readers.check_tfm = check_tfm
function readers.tfm(specification)
local fullname = specification.filename or ""
if fullname == "" then
local forced = specification.forced or ""
if forced ~= "" then
fullname = specification.name .. "." .. forced
else
fullname = specification.name
end
end
return check_tfm(specification,fullname)
end
readers.ofm = readers.tfm
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