1if not modules then modules = { } end modules [ ' grph-swf ' ] = {
2 version = 1 . 001 ,
3 comment = " companion to grph-inc.mkiv " ,
4 author = " Hans Hagen, PRAGMA-ADE, Hasselt NL " ,
5 copyright = " PRAGMA ADE / ConTeXt Development Team " ,
6 license = " see context related readme files "
7}
8
9
10
11local sub , format , match , byte = string . sub , string . format , string . match , string . byte
12local concat = table . concat
13local floor = math . floor
14local tonumber = tonumber
15
16local readstring = io . readstring
17local readnumber = io . readnumber
18local tobitstring = number . tobitstring
19local todimen = number . todimen
20local nodeinjections = backends . nodeinjections
21local figures = figures
22local context = context
23
24local function getheader ( name )
25 local f = io . open ( name , " rb " )
26 if not f then
27 return
28 end
29 local signature = readstring ( f , 3 )
30 local version = readnumber ( f , 1 )
31 local filelength = readnumber ( f , -4 )
32 local compressed = sub ( signature , 1 , 1 ) = = " C "
33 local buffer
34 if compressed then
35 buffer = zlib . decompress ( f : read ( ' *a ' ) )
36 else
37 buffer = f : read ( 20 )
38 end
39 f : close ( )
40
41 buffer = { match ( buffer , " (.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.) " ) }
42 for i = 1 , 9 do
43 buffer [ i ] = tobitstring ( byte ( buffer [ i ] ) , 8 , 8 )
44 end
45 local framebits = concat ( buffer , " " , 1 , 9 )
46 local n = tonumber ( sub ( framebits , 1 , 5 ) , 2 )
47 local frame = { }
48 local xmin = tonumber ( sub ( framebits , 6 , 5 + n ) , 2 )
49 local xmax = tonumber ( sub ( framebits , 6 + 1 * n , 5 + 2 * n ) , 2 )
50 local ymin = tonumber ( sub ( framebits , 6 + 2 * n , 5 + 3 * n ) , 2 )
51 local ymax = tonumber ( sub ( framebits , 6 + 3 * n , 5 + 4 * n ) , 2 )
52 return {
53 filename = name ,
54 version = version ,
55 filelength = filelength ,
56 framerate = tonumber ( byte ( buffer [ 10 ] ) * 256 + byte ( buffer [ 11 ] ) ) ,
57 framecount = tonumber ( byte ( buffer [ 12 ] ) * 256 + byte ( buffer [ 13 ] ) ) ,
58
59 compressed = compressed ,
60 width = floor ( ( xmax - xmin ) / 20 ) ,
61 height = floor ( ( ymax - ymin ) / 20 ) ,
62 rectangle = {
63 xmin = xmin ,
64 xmax = xmax ,
65 ymin = ymin ,
66 ymax = ymax ,
67 }
68 }
69end
70
71function figures . checkers . swf ( data )
72 local dr , du , ds = data . request , data . used , data . status
73 local foundname = du . fullname
74 local header = getheader ( foundname )
75 local width , height = figures . applyratio ( dr . width , dr . height , header . width , header . height )
76 dr . width , dr . height = width , height
77 du . width , du . height , du . foundname = width , height , foundname
78 context . startfoundexternalfigure ( todimen ( width ) , todimen ( height ) )
79 nodeinjections . insertswf {
80 foundname = foundname ,
81 width = width ,
82 height = height ,
83
84 display = dr . display ,
85 controls = dr . controls ,
86
87 resources = dr . resources ,
88 arguments = dr . arguments ,
89 }
90 context . stopfoundexternalfigure ( )
91 return data
92end
93
94figures . includers . swf = figures . includers . nongeneric
95
96figures . registersuffix ( " swf " , " swf " )
97 |
