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if not modules then modules = { } end modules ['back-res'] = {
version = 1.001,
comment = "companion to back-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local context = context
local trace = false trackers.register("backend", function(v) trace = v end)
local report = logs.reporter("backend")
local scanners = tokens.scanners
local scankeyword = scanners.keyword
local scaninteger = scanners.integer
local scanstring = scanners.string
local scandimension = scanners.dimension
local scanword = scanners.word
local scanwhd = scanners.whd
local scanners = interfaces.scanners
local implement = interfaces.implement
local constants = interfaces.constants
local variables = interfaces.variables
-- A box resource has an index. This happens to be an object number due to the pdf
-- backend but in fact it's an abstraction. This is why we have explicit fetchers.
-- The internal number (as in \Fm123) is yet another number.
local tex_saveboxresource = tex.saveboxresource
local tex_useboxresource = tex.useboxresource
local tex_getboxresourcebox = tex.getboxresourcebox
local tex_getboxresourcedimensions = tex.getboxresourcedimensions
updaters.register("backend.update",function()
tex_saveboxresource = tex.saveboxresource
tex_useboxresource = tex.useboxresource
tex_getboxresourcebox = tex.getboxresourcebox
tex_getboxresourcedimensions = tex.getboxresourcedimensions
end)
local savebox = function(...) return tex_saveboxresource(...) end
local usebox = function(...) return tex_useboxresource(...) end
local getbox = function(...) return tex_getboxresourcebox(...) end
local getwhd = function(...) return tex_getboxresourcedimensions(...) end
local boxresources = {
save = savebox,
use = usebox,
getbox = getbox,
getdimensions = getwhd,
}
tex.boxresources = boxresources
-- local tex_saveimageresource = tex.saveimageresource
-- local tex_useimageresource = tex.useimageresource
--
-- updaters.register("backend.update",function()
-- tex_saveimageresource = tex.saveimageresource
-- tex_useimageresource = tex.useimageresource
-- end)
--
-- tex.imageresources = {
-- save = function(...) return tex_saveimageresource(...) end,
-- use = function(...) return tex_useimageresource(...) end,
-- }
local lastindex = 0
local function saveboxresource()
local immediate = true
local kind = scankeyword("type") and scaninteger() or 0
local attributes = scankeyword("attr") and scanstring() or nil
local resources = scankeyword("resources") and scanstring() or nil
local margin = scankeyword("margin") and scandimension() or 0 -- register
local boxnumber = scaninteger()
--
lastindex = savebox(boxnumber,attributes,resources,immediate,kind,margin)
if trace then
report("\\saveboxresource: index %i",lastindex)
end
end
local function lastsavedboxresourceindex()
if trace then
report("\\lastsaveboxresource: index %i",lastindex)
end
context("%i",lastindex)
end
local function useboxresource()
local width, height, depth = scanwhd()
local index = scaninteger()
local node = usebox(index,width,height,depth)
if trace then
report("\\useboxresource: index %i",index)
end
context(node)
end
implement { name = "saveboxresource", actions = saveboxresource }
implement { name = "lastsavedboxresourceindex", actions = lastsavedboxresourceindex }
implement { name = "useboxresource", actions = useboxresource }
-- image resources
local imageresources = { }
local lastindex = 0
local lastpages = 1
local function saveimageresource()
local width, height, depth = scanwhd()
local page = 1
local immediate = true
local margin = 0 -- or dimension
local attributes = scankeyword("attr") and scanstring() or nil
if scankeyword("named") then
scanstring() -- ignored
elseif scankeyword("page") then
page = scaninteger()
end
local userpassword = scankeyword("userpassword") and scanstring() or nil
local ownerpassword = scankeyword("ownerpassword") and scanstring() or nil
local visiblefilename = scankeyword("visiblefilename") and scanstring() or nil
local colorspace = scankeyword("colorspace") and scaninteger() or nil
local pagebox = scanword() or nil
local filename = scanstring()
-- pcall
context.getfiguredimensions( { filename }, {
[constants.userpassword] = userpassword,
[constants.ownerpassword] = ownerpassword,
[constants.page] = page or 1,
[constants.size] = pagebox,
})
context.relax()
lastindex = lastindex + 1
lastpages = 1
imageresources[lastindex] = {
filename = filename,
page = page or 1,
size = pagebox,
width = width,
height = height,
depth = depth,
attr = attributes,
-- margin = margin,
}
end
local function lastsavedimageresourceindex()
context("%i",lastindex or 0)
end
local function lastsavedimageresourcepages()
context("%i",lastpages or 0) -- todo
end
local function useimageresource()
local width, height, depth = scanwhd()
if scankeyword("keepopen") then
-- ignored
end
local index = scaninteger()
local l = imageresources[index]
if l then
if not (width or height or depth) then
width = l.width
height = l.height
depth = l.depth
end
-- pcall / we could use a dedicated call instead:
context.externalfigure( { l.filename }, {
[constants.userpassword] = l.userpassword,
[constants.ownerpassword] = l.ownerpassword,
[constants.width] = width and (width .. "sp") or nil,
[constants.height] = height and (height .. "sp") or nil,
[constants.page] = l.page or 1,
[constants.size] = pagebox,
})
context.relax()
else
report("no valid image resource %a",index)
end
end
implement { name = "saveimageresource", actions = saveimageresource }
implement { name = "lastsavedimageresourceindex", actions = lastsavedimageresourceindex }
implement { name = "lastsavedimageresourcepages", actions = lastsavedimageresourcepages }
implement { name = "useimageresource", actions = useimageresource }
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