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if not modules then modules = { } end modules ['grph-swf'] = {
version = 1.001,
comment = "companion to grph-inc.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- maybe: backends.codeinjections.insertswf
local sub, format, match, byte = string.sub, string.format, string.match, string.byte
local concat = table.concat
local floor = math.floor
local tonumber = tonumber
local readstring = io.readstring
local readnumber = io.readnumber
local tobitstring = number.tobitstring
local todimen = number.todimen
local nodeinjections = backends.nodeinjections
local figures = figures
local context = context
local function getheader(name)
local f = io.open(name,"rb")
if not f then
return
end
local signature = readstring(f,3) -- F=uncompressed, C=compressed (zlib)
local version = readnumber(f,1)
local filelength = readnumber(f,-4)
local compressed = sub(signature,1,1) == "C"
local buffer
if compressed then
buffer = zlib.decompress(f:read('*a'))
else
buffer = f:read(20) -- ('*a')
end
f:close()
buffer = { match(buffer,"(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)") }
for i=1,9 do
buffer[i] = tobitstring(byte(buffer[i]))
end
local framebits = concat(buffer,"",1,9)
local n = tonumber(sub(framebits,1,5),2)
local frame = { } -- xmin xmax ymin ymax
local xmin = tonumber(sub(framebits,6, 5 + n),2)
local xmax = tonumber(sub(framebits,6 + 1*n,5 + 2*n),2)
local ymin = tonumber(sub(framebits,6 + 2*n,5 + 3*n),2)
local ymax = tonumber(sub(framebits,6 + 3*n,5 + 4*n),2)
return {
filename = name,
version = version,
filelength = filelength,
framerate = tonumber(byte(buffer[10]) * 256 + byte(buffer[11])),
framecount = tonumber(byte(buffer[12]) * 256 + byte(buffer[13])),
-- framebits = framebits,
compressed = compressed,
width = floor((xmax - xmin) / 20),
height = floor((ymax - ymin) / 20),
rectangle = {
xmin = xmin,
xmax = xmax,
ymin = ymin,
ymax = ymax,
}
}
end
function figures.checkers.swf(data)
local dr, du, ds = data.request, data.used, data.status
local foundname = du.fullname
local header = getheader(foundname)
local width, height = figures.applyratio(dr.width,dr.height,header.width,header.height)
dr.width, dr.height = width, height
du.width, du.height, du.foundname = width, height, foundname
context.startfoundexternalfigure(todimen(width),todimen(height))
nodeinjections.insertswf {
foundname = foundname,
width = width,
height = height,
-- factor = number.dimenfactors.bp,
display = dr.display,
controls = dr.controls,
-- label = dr.label,
resources = dr.resources,
}
context.stopfoundexternalfigure()
return data
end
figures.includers.swf = figures.includers.nongeneric
figures.registersuffix("swf","swf")
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