1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
if not modules then modules = { } end modules ['font-msc'] = {
version = 1.001,
comment = "companion to font-otf.lua (slanting, extending, colors)",
author = "Khaled Hosny",
copyright = "Khaled Hosny",
license = "GPL"
}
--[[
Support for font slanting and extending.
--]]
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,"slant")
function fonts.initializers.common.slant(tfmdata,value)
value = tonumber(value)
if not value then
value = 0
elseif value > 1 then
value = 1
elseif value < -1 then
value = -1
end
tfmdata.slant_factor = value
end
initializers.base.otf.slant = initializers.common.slant
initializers.node.otf.slant = initializers.common.slant
table.insert(fonts.triggers,"extend")
function initializers.common.extend(tfmdata,value)
value = tonumber(value)
if not value then
value = 0
elseif value > 10 then
value = 10
elseif value < -10 then
value = -10
end
tfmdata.extend_factor = value
end
initializers.base.otf.extend = initializers.common.extend
initializers.node.otf.extend = initializers.common.extend
--[[
Support for font color.
--]]
table.insert(fonts.triggers,"color")
function initializers.common.color(tfmdata,value)
if value then
tfmdata.color = value
luaotfload.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
return fonts.ids[n.font].color
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
function luaotfload.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 = luaotfload.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
function luaotfload.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 = luaotfload.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
luaotfload.color_callback_activated = 0
local message_displayed = 0
function luaotfload.add_color_callback()
if tex.luatexversion < 44 then
if message_displayed == 0 then
luatextra.module_warning("luaotfload","You must have a LuaTeX with version >= 0.44 in order to get colors working, colors won't work.")
message_displayed = 1
end
elseif luaotfload.color_callback_activated == 0 then
callback.add("pre_output_filter", luaotfload.colorize, "loaotfload.colorize")
luaotfload.color_callback_activated = 1
end
end
function luaotfload.remove_color_callback()
if luaotfload.color_callback_activated == 1 then
callback.remove("pre_output_filter", "loaotfload.colorize")
luaotfload.color_callback_activated = 0
end
end
|
