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
|
if not modules then modules = { } end modules ['lpdf-epa'] = {
version = 1.001,
comment = "companion to lpdf-epa.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is a rather experimental feature and the code will probably
-- change.
local type, tonumber = type, tonumber
local format = string.format
local trace_links = false trackers.register("figures.links", function(v) trace_links = v end)
local report_link = logs.new("backend","merging")
local backends, lpdf = backends, lpdf
local variables = interfaces.variables
local codeinjections = backends.pdf.codeinjections
local layerspec = { -- predefining saves time
"epdflinks"
}
local function add_link(x,y,w,h,destination,what)
if trace_links then
report_link("dx: % 4i, dy: % 4i, wd: % 4i, ht: % 4i, destination: %s, type: %s",x,y,w,h,destination,what)
end
local locationspec = { -- predefining saves time
x = x .. "bp",
y = y .. "bp",
preset = "leftbottom",
}
local buttonspec = {
width = w .. "bp",
height = h .. "bp",
offset = variables.overlay,
frame = trace_links and variables.on or variables.off,
}
context.setlayer (
layerspec,
locationspec,
function() context.button ( buttonspec, "", { destination } ) end
-- context.nested.button(buttonspec, "", { destination }) -- time this
)
end
local function link_goto(x,y,w,h,document,annotation,pagesdata,pagedata,namespace)
-- print("border",table.unpack(annotation.Border.all))
-- print("flags",annotation.F)
-- print("pagenumbers",pagedata.reference.num,destination[1].num)
-- print("pagerefs",pagedata.number,pagesdata.references[destination[1].num])
local destination = annotation.A.D -- [ 18 0 R /Fit ]
local what = "page"
if type(destination) == "string" then
local destinations = document.Catalog.Destinations
local wanted = destinations[destination]
destination = wanted and wanted.D
if destination then what = "named" end
end
local whereto = destination and destination[1] -- array
if whereto and whereto.num then
local currentpage = pagedata.number
local destinationpage = pagesdata.references[whereto.num]
add_link(x,y,w,h,namespace .. destinationpage,what)
return
end
end
local function link_uri(x,y,w,h,document,annotation)
local url = annotation.A.URI
if url then
add_link(x,y,w,h,format("url(%s)",url),"url")
end
end
local function link_file(x,y,w,h,document,annotation)
local filename = annotation.A.F
if filename then
local destination = annotation.A.D
if not destination then
add_link(x,y,w,h,format("file(%s)",filename),"file")
elseif type(destination) == "string" then
add_link(x,y,w,h,format("%s::%s",filename,destination),"file (named)")
else
destination = destination[1] -- array
if tonumber(destination) then
add_link(x,y,w,h,format("%s::page(%s)",filename,destination),"file (page)")
else
add_link(x,y,w,h,format("file(%s)",filename),"file")
end
end
end
end
function codeinjections.mergereferences(specification)
if figures and not specification then
specification = figures and figures.current()
specification = specification and specification.status
end
if specification then
local fullname = specification.fullname
local document = lpdf.load(fullname)
if document then
local pagenumber = specification.page or 1
local xscale = specification.yscale or 1
local yscale = specification.yscale or 1
local size = specification.size or "crop" -- todo
local pagesdata = document.Catalog.Pages
local pagedata = pagesdata[pagenumber]
local annotations = pagedata.Annots
local namespace = format("lpdf-epa-%s-",file.removesuffix(file.basename(fullname)))
local reference = namespace .. pagenumber
if annotations.size > 0 then
local llx, lly, urx, ury = table.unpack(pagedata.MediaBox.all)
local width, height = xscale * (urx - llx), yscale * (ury - lly) -- \\overlaywidth, \\overlayheight
context.definelayer( { "epdflinks" }, { height = height.."bp" , width = width.."bp" })
for i=1,annotations.size do
local annotation = annotations[i]
local subtype = annotation.Subtype
local a_llx, a_lly, a_urx, a_ury = table.unpack(annotation.Rect.all)
local x, y = xscale * (a_llx - llx), yscale * (a_lly - lly)
local w, h = xscale * (a_urx - a_llx), yscale * (a_ury - a_lly)
if subtype == "Link" then
local linktype = annotation.A.S
if linktype == "GoTo" then
link_goto(x,y,w,h,document,annotation,pagesdata,pagedata,namespace)
elseif linktype == "GoToR" then
link_file(x,y,w,h,document,annotation)
elseif linktype == "URI" then
link_uri(x,y,w,h,document,annotation)
elseif trace_links then
report_link("unsupported link annotation '%s'",linktype)
end
elseif trace_links then
report_link("unsupported annotation '%s'",subtype)
end
end
context.flushlayer { "epdflinks" }
-- context("\\gdef\\figurereference{%s}",reference) -- global
context.setgvalue("figurereference",reference) -- global
if trace_links then
report_link("setting figure reference to '%s'",reference)
end
specification.reference = reference
return namespace
end
end
end
return ""-- no namespace, empty, not nil
end
function codeinjections.mergeviewerlayers(specification)
if not specification then
specification = figures and figures.current()
specification = specification and specification.status
end
if specification then
local fullname = specification.fullname
local document = lpdf.load(fullname)
if document then
local pagenumber = specification.page or 1
local pagesdata = document.Catalog.Pages
local pagedata = pagesdata[pagenumber]
local resources = pagedata.Resources
--~ table.print(resources)
--~ local properties = resources.Properties
end
end
end
|