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if not modules then modules = { } end modules ['lpdf-mis'] = {
version = 1.001,
comment = "companion to lpdf-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local type = type
local format, gsub = string.format, string.gsub
-- colors = colors or { }
-- transparencies = transparencies or { }
local registercolor = colors.register
local registertransparancy = transparencies.register
local colorsvalue = colors.value
local transparenciesvalue = transparencies.value
-- Literals needed to inject code in the mp stream, we cannot use attributes there
-- since literals may have qQ's, much may go away once we have mplib code in place.
--
-- This module assumes that some functions are defined in the colors namespace
-- which mostlikely will be loaded later.
function lpdf.color(model,ca,default) -- todo: use gray when no color
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
if model == 2 then
local s = cv[2]
return format("%s g %s G",s,s)
elseif model == 3 then
local r, g, b = cv[3], cv[4], cv[5]
return format("%s %s %s rg %s %s %s RG",r,g,b,r,g,b)
elseif model == 4 then
local c, m, y, k = cv[6],cv[7],cv[8],cv[9]
return format("%s %s %s %s k %s %s %s %s K",c,m,y,k,c,m,y,k)
else
local n,f,d,p = cv[10],cv[11],cv[12],cv[13]
if type(p) == "string" then
p = gsub(p,","," ") -- brr misuse of spot
end
return format("/%s cs /%s CS %s SCN %s scn",n,n,p,p)
end
else
return format("%s g %s G",default or 0,default or 0)
end
end
function lpdf.transparency(ct,default) -- kind of overlaps with transparencycode
-- beware, we need this hack because normally transparencies are not
-- yet registered and therefore the number is not not known ... we
-- might use the attribute number itself in the future
local ct = transparenciesvalue(ct)
if ct then
return format("/Tr%s gs",registertransparancy(nil,ct[1],ct[2],true))
else
return "/Tr0 gs"
end
end
function lpdf.colorvalue(model,ca,default)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
if model == 2 then
return format("%s",cv[2])
elseif model == 3 then
return format("%s %s %s",cv[3],cv[4],cv[5])
elseif model == 4 then
return format("%s %s %s %s",cv[6],cv[7],cv[8],cv[9])
else
return format("%s",cv[13])
end
else
return format("%s",default or 0)
end
end
function lpdf.fdfcolor(model,ca,default)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
if model == 2 then
return format("[%s]",cv[2])
elseif model == 3 then
return format("[%s %s %s]",cv[3],cv[4],cv[5])
elseif model == 4 then
return format("[%s %s %s %s]",cv[6],cv[7],cv[8],cv[9])
elseif model == 4 then
return format("[%s]",cv[13])
end
else
return format("[%s]",default or 0)
end
end
function lpdf.colorspace(model,ca)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
if model == 2 then
return "DeviceGray"
elseif model == 3 then
return "DeviceRGB"
elseif model == 4 then
return "DeviceCMYK"
end
end
return "DeviceGRAY"
end
-- by registering we getconversion for free (ok, at the cost of overhead)
local intransparency = false
local pdfcolor = lpdf.color
function lpdf.rgbcode(model,r,g,b)
return pdfcolor(model,registercolor(nil,'rgb',r,g,b))
end
function lpdf.cmykcode(model,c,m,y,k)
return pdfcolor(model,registercolor(nil,'cmyk',c,m,y,k))
end
function lpdf.graycode(model,s)
return pdfcolor(model,registercolor(nil,'gray',s))
end
function lpdf.spotcode(model,n,f,d,p)
return pdfcolor(model,registercolor(nil,'spot',n,f,d,p)) -- incorrect
end
function lpdf.transparencycode(a,t)
intransparency = true
return format("/Tr%s gs",registertransparancy(nil,a,t,true)) -- true forces resource
end
function lpdf.finishtransparencycode()
if intransparency then
intransparency = false
return "/Tr0 gs" -- we happen to know this -)
else
return ""
end
end
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