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
|
if not modules then modules = { } end modules ['font-tmp'] = {
version = 1.001,
comment = "companion to font-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- There is a complete feature loader but it needs a bit of testing, first so this
-- one does design size only (as needed for identifying).
local next, type = next, type
local report = logs.reporter("otf reader")
local readers = fonts.handlers.otf.readers
local streamreader = readers.streamreader
local readushort = streamreader.readcardinal2 -- 16-bit unsigned integer
local readulong = streamreader.readcardinal4 -- 24-bit unsigned integer
local readshort = streamreader.readinteger2 -- 16-bit signed integer
local readtag = streamreader.readtag
local skipshort = streamreader.skipshort
local setposition = streamreader.setposition
local plugins = { }
function plugins.size(f,fontdata,tableoffset,parameters)
if not fontdata.designsize then
setposition(f,tableoffset+parameters)
local designsize = readushort(f)
if designsize > 0 then
fontdata.designsize = designsize
skipshort(f,2)
fontdata.minsize = readushort(f)
fontdata.maxsize = readushort(f)
end
end
end
local function readscripts(f,fontdata,what)
local datatable = fontdata.tables[what]
if not datatable then
return
end
local tableoffset = datatable.offset
setposition(f,tableoffset)
local version = readulong(f)
if version ~= 0x00010000 then
report("table version %a of %a is not supported (yet), maybe font %s is bad",version,what,fontdata.filename)
return
end
--
local scriptoffset = tableoffset + readushort(f)
local featureoffset = tableoffset + readushort(f)
local lookupoffset = tableoffset + readushort(f)
--
setposition(f,scriptoffset)
local nofscripts = readushort(f)
local scripts = { }
for i=1,nofscripts do
scripts[readtag(f)] = scriptoffset + readushort(f)
end
local languagesystems = table.setmetatableindex("table") -- we share when possible
for script, offset in next, scripts do
setposition(f,offset)
local defaultoffset = readushort(f)
local noflanguages = readushort(f)
local languages = { }
if defaultoffset > 0 then
languages.dflt = languagesystems[offset + defaultoffset]
end
for i=1,noflanguages do
local language = readtag(f)
local offset = offset + readushort(f)
languages[language] = languagesystems[offset]
end
scripts[script] = languages
end
--
setposition(f,featureoffset)
local features = { }
local noffeatures = readushort(f)
for i=1,noffeatures do
features[i] = {
tag = readtag(f),
offset = readushort(f)
}
end
--
for i=1,noffeatures do
local feature = features[i]
local offset = featureoffset + feature.offset
setposition(f,offset)
local parameters = readushort(f) -- feature.parameters
local noflookups = readushort(f)
skipshort(f,noflookups+1)
if parameters > 0 then
feature.parameters = parameters
local plugin = plugins[feature.tag]
if plugin then
plugin(f,fontdata,offset,parameters)
end
end
end
end
function readers.gsub(f,fontdata,specification)
if specification.details then
readscripts(f,fontdata,"gsub")
end
end
function readers.gpos(f,fontdata,specification)
if specification.details then
readscripts(f,fontdata,"gpos")
end
end
|
