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if not modules then modules = { } end modules ['font-imp-tracing'] = {
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"
}
if not context then return end
local next, type = next, type
local concat = table.concat
local formatters = string.formatters
local fonts = fonts
local handlers = fonts.handlers
local registerotffeature = handlers.otf.features.register
local registerafmfeature = handlers.afm.features.register
local settings_to_array = utilities.parsers.settings_to_array
local setmetatableindex = table.setmetatableindex
local helpers = fonts.helpers
local appendcommandtable = helpers.appendcommandtable
local prependcommands = helpers.prependcommands
local charcommand = helpers.commands.char
local variables = interfaces.variables
local v_background = variables.background
local v_frame = variables.frame
local v_empty = variables.empty
local v_none = variables.none
-- for zhichu chen (see mailing list archive): we might add a few more variants
-- in due time
--
-- \definefontfeature[boxed][default][boundingbox=yes] % paleblue
--
-- maybe:
--
-- \definecolor[DummyColor][s=.75,t=.5,a=1] {\DummyColor test} \nopdfcompression
--
-- local gray = { "pdf", "origin", "/Tr1 gs .75 g" }
-- local black = { "pdf", "origin", "/Tr0 gs 0 g" }
-- boundingbox={yes|background|frame|empty|<color>}
local bp = number.dimenfactors.bp
local r = 16384 * bp -- 65536 // 4
local f_1 = formatters["%.6F w 0 %.6F %.6F %.6F re f"]
local f_2 = formatters["[] 0 d 0 J %.6F w %.6F %.6F %.6F %.6F re S"]
-- change this into w h d instead of h d w
local backcache = setmetatableindex(function(t,h)
local h = h * bp
local v = setmetatableindex(function(t,d)
local d = d * bp
local v = setmetatableindex(function(t,w)
local v = { "pdf", "origin", f_1(r,-d,w*bp,h+d) }
t[w] = v
return v
end)
t[d] = v
return v
end)
t[h] = v
return v
end)
local forecache = setmetatableindex(function(t,h)
local h = h * bp
local v = setmetatableindex(function(t,d)
local d = d * bp
local v = setmetatableindex(function(t,w)
-- the frame goes through the boundingbox
local v = { "pdf", "origin", f_2(r,r/2,-d+r/2,w*bp-r,h+d-r) }
t[w] = v
return v
end)
t[d] = v
return v
end)
t[h] = v
return v
end)
local startcolor = nil
local stopcolor = nil
local function initialize(tfmdata,key,value)
if value then
if not backcolors then
local vfspecials = backends.pdf.tables.vfspecials
startcolor = vfspecials.startcolor
stopcolor = vfspecials.stopcolor
end
local characters = tfmdata.characters
local rulecache = backcache
local showchar = true
local color = "palegray"
if type(value) == "string" then
value = settings_to_array(value)
for i=1,#value do
local v = value[i]
if v == v_frame then
rulecache = forecache
elseif v == v_background then
rulecache = backcache
elseif v == v_empty then
showchar = false
elseif v == v_none then
color = nil
else
color = v
end
end
end
local gray = color and startcolor(color) or nil
local black = gray and stopcolor or nil
for unicode, character in next, characters do
local width = character.width or 0
local height = character.height or 0
local depth = character.depth or 0
local rule = rulecache[height][depth][width]
if showchar then
local commands = character.commands
if commands then
if gray then
character.commands = prependcommands (
commands, gray, rule, black
)
else
character.commands = prependcommands (
commands, rule
)
end
else
local char = charcommand[unicode]
if gray then
character.commands = {
gray, rule, black, char
}
else
character.commands = {
rule, char
}
end
end
else
if gray then
character.commands = {
gray, rule, black
}
else
character.commands = {
rule
}
end
end
end
end
end
local specification = {
name = "boundingbox",
description = "show boundingbox",
manipulators = {
base = initialize,
node = initialize,
}
}
registerotffeature(specification)
registerafmfeature(specification)
local f_m = formatters["%F %F m"]
local f_l = formatters["%F %F l"]
local f_b = formatters["[] 0 d 0 J %.6F w"]
local f_e = formatters["s"]
local function ladder(list,docolor,nocolor,lst,offset,sign,default)
local l = lst[1]
local x1 = bp * (offset + l.kern) * sign
local y1 = bp * l.height
local t = { f_b(r,r/2), f_m(x1,y1) }
local n = 2
local m = #lst
if default > 0 then
default = default * bp + r
else
default = default * bp - r
end
if m == 1 then
n = n + 1 t[n] = f_l(x1,default)
else
for i=1,m do
local l = lst[i]
local x2 = bp * (offset + l.kern) * sign
local y2 = bp * l.height
if i > 1 and y2 == 0 then
y2 = default
end
n = n + 1 t[n] = f_l(x2,y1)
n = n + 1 t[n] = f_l(x2,y2)
x1, y1 = x2, y2
end
end
n = n + 1 t[n] = f_e()
list[#list+1] = docolor
list[#list+1] = { "pdf", "origin", concat(t," ") }
list[#list+1] = nocolor
end
local function initialize(tfmdata,key,value)
if value then
if not backcolors then
local vfspecials = backends.pdf.tables.vfspecials
startcolor = vfspecials.startcolor
stopcolor = vfspecials.stopcolor
end
local characters = tfmdata.characters
local brcolor = startcolor("darkred")
local trcolor = startcolor("darkgreen")
local blcolor = startcolor("darkblue")
local tlcolor = startcolor("darkyellow")
local black = stopcolor
for unicode, character in next, characters do
local mathkern = character.mathkern
if mathkern then
-- more efficient would be co collect more in one pdf
-- directive but this is hardly used so not worth the
-- effort
local width = character.width or 0
local height = character.height or 0
local depth = character.depth or 0
local list = { }
local br = mathkern.bottom_right
local tr = mathkern.top_right
local bl = mathkern.bottom_left
local tl = mathkern.top_left
if br then
ladder(list,brcolor,black,br,width,1,height)
end
if tr then
ladder(list,trcolor,black,tr,width,1,-depth)
end
if bl then
ladder(list,blcolor,black,bl,0,-1,height)
end
if tl then
ladder(list,tlcolor,black,tl,0,-1,-depth)
end
if #list > 0 then
local commands = character.commands
if commands then
character.commands = appendcommandtable(commands,list)
else
list[#list+1] = charcommand[unicode]
character.commands = list
end
end
end
end
end
end
local specification = {
name = "staircase",
description = "show staircase kerns",
position=1,
manipulators = {
base = initialize,
node = initialize,
}
}
registerotffeature(specification)
registerafmfeature(specification)
|
