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Diffstat (limited to 'tex/context/base/font-vf.lua')
| -rw-r--r-- | tex/context/base/font-vf.lua | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/tex/context/base/font-vf.lua b/tex/context/base/font-vf.lua new file mode 100644 index 000000000..4f99c47b9 --- /dev/null +++ b/tex/context/base/font-vf.lua @@ -0,0 +1,213 @@ +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 ! + +fonts = fonts or { } +fonts.vf = fonts.vf or { } + +local vf = fonts.vf +local tfm = fonts.tfm + +fonts.define = fonts.define or { } +fonts.define.methods = fonts.define.methods or { } + +vf.combinations = vf.combinations or { } +vf.aux = vf.aux or { } +vf.aux.combine = vf.aux.combine or { } + +function fonts.define.methods.install(tag, rules) + vf.combinations[tag] = rules + fonts.define.methods[tag] = function(specification) + return vf.combine(specification,tag) + end +end + +function vf.aux.combine.assign(g, name, from, to, start, force) + local f, id = 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 + 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] = table.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 = table.fastcopy(f.parameters) + g.italicangle = f.italicangle + g.ascender = f.ascender + g.descender = f.descender + g.factor = f.factor -- brrr + end + end +end + +function vf.aux.combine.process(g,list) + if list then + for _,v in next, list do + (vf.aux.combine.commands[v[1]] or nop)(g,v) + end + end +end + +function vf.aux.combine.load(g,name) + return tfm.read_and_define(name or g.specification.name,g.specification.size) +end + +function vf.aux.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] = table.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 = table.fastcopy(f.parameters) + g.italicangle = f.italicangle + g.ascender = f.ascender + g.descender = f.descender + g.factor = f.factor -- brrr + end + end +end + +vf.aux.combine.commands = { + ["initialize"] = function(g,v) vf.aux.combine.assign (g,g.name) end, + ["include-method"] = function(g,v) vf.aux.combine.process (g,vf.combinations[v[2]]) end, -- name + ["copy-parameters"] = function(g,v) vf.aux.combine.parameters(g,v[2]) end, -- name + ["copy-range"] = function(g,v) 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) vf.aux.combine.assign (g,v[2],v[3],v[3],v[4],true) end, -- name, from, to + ["fallback-range"] = function(g,v) 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) vf.aux.combine.assign (g,v[2],v[3],v[3],v[4],false) end, -- name, from, to + ["copy_names"] = function(g,v) vf.aux.combine.names (g,v[2],true) end, + ["fallback_names"] = function(g,v) vf.aux.combine.names (g,v[2],false) end, +} + +function vf.combine(specification,tag) + local g = { + name = specification.name, + -- type = 'virtual', + virtualized = true, + fonts = { }, + characters = { }, + descriptions = { }, + specification = table.fastcopy(specification) + } + vf.aux.combine.process(g,vf.combinations[tag]) + return g +end + +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 + 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 red = {'special','pdf: 1 0 0 rg'} + local green = {'special','pdf: 0 1 0 rg'} + local blue = {'special','pdf: 0 0 1 rg'} + local black = {'special','pdf: 0 g'} + 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 |