2016-01-12 16:26:00

1 files changed, 198 insertions, 0 deletions

diff --git a/tex/context/base/mkiv/font-tfm.lua b/tex/context/base/mkiv/font-tfm.lua
new file mode 100644
index 000000000..2dd576849
--- /dev/null
+++ b/tex/context/base/mkiv/font-tfm.lua
@@ -0,0 +1,198 @@
+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
+
+--[[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+-- don't support ofm files anyway as this format is obsolete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.haslogatures = 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