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if not modules then modules = { } end modules ['font-clr'] = {
version = 1.001,
comment = "companion to font-otf.lua (font color)",
author = "Khaled Hosny and Elie Roux",
copyright = "Luaotfload Development Team",
license = "GPL"
}
fonts.triggers = fonts.triggers or { }
fonts.initializers = fonts.initializers or { }
fonts.initializers.common = fonts.initializers.common or { }
local initializers, format = fonts.initializers, string.format
table.insert(fonts.triggers,"color")
function initializers.common.color(tfmdata,value)
local sanitized
if value then
value = tostring(value)
if #value == 6 or #value == 8 then
sanitized = value
elseif #value == 7 then
_, _, sanitized = value:find("(......)")
elseif #value > 8 then
_, _, sanitized = value:find("(........)")
else
-- broken color code ignored, issue a warning?
end
end
if sanitized then
tfmdata.color = sanitized
add_color_callback()
end
end
initializers.base.otf.color = initializers.common.color
initializers.node.otf.color = initializers.common.color
local function hex2dec(hex,one)
if one then
return format("%.1g", tonumber(hex, 16)/255)
else
return format("%.3g", tonumber(hex, 16)/255)
end
end
local res
local function pageresources(a)
local res2
if not res then
res = "/TransGs1<</ca 1/CA 1>>"
end
res2 = format("/TransGs%s<</ca %s/CA %s>>", a, a, a)
res = format("%s%s", res, res:find(res2) and "" or res2)
end
local function hex_to_rgba(hex)
local r, g, b, a, push, pop, res3
if hex then
if #hex == 6 then
_, _, r, g, b = hex:find('(..)(..)(..)')
elseif #hex == 8 then
_, _, r, g, b, a = hex:find('(..)(..)(..)(..)')
a = hex2dec(a,true)
pageresources(a)
end
else
return nil
end
r = hex2dec(r)
g = hex2dec(g)
b = hex2dec(b)
if a then
push = format('/TransGs%g gs %s %s %s rg', a, r, g, b)
pop = '0 g /TransGs1 gs'
else
push = format('%s %s %s rg', r, g, b)
pop = '0 g'
end
return push, pop
end
local glyph = node.id('glyph')
local hlist = node.id('hlist')
local vlist = node.id('vlist')
local whatsit = node.id('whatsit')
local pgi = node.id('page_insert')
local sbox = node.id('sub_box')
local function lookup_next_color(head)
for n in node.traverse(head) do
if n.id == glyph then
if fonts.ids[n.font] and fonts.ids[n.font].color then
return fonts.ids[n.font].color
else
return -1
end
elseif n.id == vlist or n.id == hlist or n.id == sbox then
local r = lookup_next_color(n.list)
if r == -1 then
return -1
elseif r then
return r
end
elseif n.id == whatsit or n.id == pgi then
return -1
end
end
return nil
end
local function node_colorize(head, current_color, next_color)
for n in node.traverse(head) do
if n.id == hlist or n.id == vlist or n.id == sbox then
local next_color_in = lookup_next_color(n.next) or next_color
n.list, current_color = node_colorize(n.list, current_color, next_color_in)
elseif n.id == glyph then
local tfmdata = fonts.ids[n.font]
if tfmdata and tfmdata.color then
if tfmdata.color ~= current_color then
local pushcolor = hex_to_rgba(tfmdata.color)
local push = node.new(whatsit, 8)
push.mode = 1
push.data = pushcolor
head = node.insert_before(head, n, push)
current_color = tfmdata.color
end
local next_color_in = lookup_next_color (n.next) or next_color
if next_color_in ~= tfmdata.color then
local _, popcolor = hex_to_rgba(tfmdata.color)
local pop = node.new(whatsit, 8)
pop.mode = 1
pop.data = popcolor
head = node.insert_after(head, n, pop)
current_color = nil
end
end
end
end
return head, current_color
end
local function font_colorize(head)
-- check if our page resources existed in the previous run
-- and remove it to avoid duplicating it later
if res then
local r = "/ExtGState<<"..res..">>"
tex.pdfpageresources = tex.pdfpageresources:gsub(r, "")
end
local h = node_colorize(head, nil, nil)
-- now append our page resources
if res and res:find("%S") then -- test for non-empty string
local r = "/ExtGState<<"..res..">>"
tex.pdfpageresources = tex.pdfpageresources..r
end
return h
end
local color_callback_activated = 0
function add_color_callback()
if color_callback_activated == 0 then
luatexbase.add_to_callback("pre_output_filter", font_colorize, "loaotfload.colorize")
color_callback_activated = 1
end
end
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