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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"
}
local next, type = next, type
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 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"]
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)
|
