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
|
if not modules then modules = { } end modules ['lpdf-mis'] = {
version = 1.001,
comment = "companion to lpdf-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local type = type
local format, gsub = string.format, string.gsub
local backends, lpdf = backends, lpdf
local colors = attributes.colors
local transparencies = attributes.transparencies
local registertransparancy = transparencies.register
local registercolor = colors.register
local colorsvalue = colors.value
local transparenciesvalue = transparencies.value
local forcedmodel = colors.forcedmodel
-- Literals needed to inject code in the mp stream, we cannot use attributes there
-- since literals may have qQ's, much may go away once we have mplib code in place.
--
-- This module assumes that some functions are defined in the colors namespace
-- which most likely will be loaded later.
function lpdf.color(model,ca,default) -- todo: use gray when no color
if colors.supported then
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
model = forcedmodel(model)
if model == 2 then
local s = cv[2]
return format("%s g %s G",s,s)
elseif model == 3 then
local r, g, b = cv[3], cv[4], cv[5]
return format("%s %s %s rg %s %s %s RG",r,g,b,r,g,b)
elseif model == 4 then
local c, m, y, k = cv[6],cv[7],cv[8],cv[9]
return format("%s %s %s %s k %s %s %s %s K",c,m,y,k,c,m,y,k)
else
local n,f,d,p = cv[10],cv[11],cv[12],cv[13]
if type(p) == "string" then
p = gsub(p,","," ") -- brr misuse of spot
end
return format("/%s cs /%s CS %s SCN %s scn",n,n,p,p)
end
else
return format("%s g %s G",default or 0,default or 0)
end
else
return ""
end
end
function lpdf.transparency(ct,default) -- kind of overlaps with transparencycode
-- beware, we need this hack because normally transparencies are not
-- yet registered and therefore the number is not not known ... we
-- might use the attribute number itself in the future
if transparencies.supported then
local ct = transparenciesvalue(ct)
if ct then
return format("/Tr%s gs",registertransparancy(nil,ct[1],ct[2],true))
else
return "/Tr0 gs"
end
else
return ""
end
end
function lpdf.colorvalue(model,ca,default)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
model = forcedmodel(model)
if model == 2 then
return format("%s",cv[2])
elseif model == 3 then
return format("%s %s %s",cv[3],cv[4],cv[5])
elseif model == 4 then
return format("%s %s %s %s",cv[6],cv[7],cv[8],cv[9])
else
return format("%s",cv[13])
end
else
return format("%s",default or 0)
end
end
function lpdf.fdfcolor(model,ca,default)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
model = forcedmodel(model)
if model == 2 then
return format("[%s]",cv[2])
elseif model == 3 then
return format("[%s %s %s]",cv[3],cv[4],cv[5])
elseif model == 4 then
return format("[%s %s %s %s]",cv[6],cv[7],cv[8],cv[9])
elseif model == 4 then
return format("[%s]",cv[13])
end
else
return format("[%s]",default or 0)
end
end
function lpdf.colorspace(model,ca)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
model = forcedmodel(model)
if model == 2 then
return "DeviceGray"
elseif model == 3 then
return "DeviceRGB"
elseif model == 4 then
return "DeviceCMYK"
end
end
return "DeviceGRAY"
end
-- by registering we getconversion for free (ok, at the cost of overhead)
local intransparency = false
local pdfcolor = lpdf.color
function lpdf.rgbcode(model,r,g,b)
if colors.supported then
return pdfcolor(model,registercolor(nil,'rgb',r,g,b))
else
return ""
end
end
function lpdf.cmykcode(model,c,m,y,k)
if colors.supported then
return pdfcolor(model,registercolor(nil,'cmyk',c,m,y,k))
else
return ""
end
end
function lpdf.graycode(model,s)
if colors.supported then
return pdfcolor(model,registercolor(nil,'gray',s))
else
return ""
end
end
function lpdf.spotcode(model,n,f,d,p)
if colors.supported then
return pdfcolor(model,registercolor(nil,'spot',n,f,d,p)) -- incorrect
else
return ""
end
end
function lpdf.transparencycode(a,t)
if transparencies.supported then
intransparency = true
return format("/Tr%s gs",registertransparancy(nil,a,t,true)) -- true forces resource
else
return ""
end
end
function lpdf.finishtransparencycode()
if transparencies.supported and intransparency then
intransparency = false
return "/Tr0 gs" -- we happen to know this -)
else
return ""
end
end
-- this will move to lpdf-spe.lua
backends.pdf.tables.vfspecials = { -- todo: distinguish between glyph and rule color
red = { "special", 'pdf: 1 0 0 rg 1 0 0 RG' },
green = { "special", 'pdf: 0 1 0 rg 0 1 0 RG' },
blue = { "special", 'pdf: 0 0 1 rg 0 0 1 RG' },
black = { "special", 'pdf: 0 g 0 G' },
startslant = function(a) return { "special", format("pdf: q 1 0 %s 1 0 0 cm",a) } end,
stopslant = { "special", "pdf: Q" },
}
|
