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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
local backends, lpdf = backends, lpdf
local colors = attributes.colors
local transparencies = attributes.transparencies
local registertransparancy = transparencies.register
local registercolor = colors.register
local colorsvalue = colors.value
local transparenciesvalue = transparencies.value
local forcedmodel = colors.forcedmodel
-- 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 most likely will be loaded later.
local function lpdfcolor(model,ca,default) -- todo: use gray when no color
if colors.supported then
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
model = forcedmodel(model)
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
else
return ""
end
end
lpdf.color = lpdfcolor
function lpdf.pdfcolor(attribute) -- bonus, for pgf and friends
context(lpdfcolor(1,attribute))
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
if transparencies.supported then
local ct = transparenciesvalue(ct)
if ct then
return format("/Tr%s gs",registertransparancy(nil,ct[1],ct[2],true))
else
return "/Tr0 gs"
end
else
return ""
end
end
function lpdf.colorvalue(model,ca,default)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
model = forcedmodel(model)
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
--~ model = forcedmodel(model)
--~ 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.colorvalues(model,ca,default)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
model = forcedmodel(model)
if model == 2 then
return cv[2]
elseif model == 3 then
return cv[3], cv[4], cv[5]
elseif model == 4 then
return cv[6], cv[7], cv[8], cv[9]
elseif model == 4 then
return cv[13]
end
else
return default or 0
end
end
function lpdf.transparencyvalue(ta,default)
local tv = transparenciesvalue(ta)
if tv then
return tv[2]
else
return default or 1
end
end
function lpdf.colorspace(model,ca)
local cv = colorsvalue(ca)
if cv then
if model == 1 then
model = cv[1]
end
model = forcedmodel(model)
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)
if colors.supported then
return pdfcolor(model,registercolor(nil,'rgb',r,g,b))
else
return ""
end
end
function lpdf.cmykcode(model,c,m,y,k)
if colors.supported then
return pdfcolor(model,registercolor(nil,'cmyk',c,m,y,k))
else
return ""
end
end
function lpdf.graycode(model,s)
if colors.supported then
return pdfcolor(model,registercolor(nil,'gray',s))
else
return ""
end
end
function lpdf.spotcode(model,n,f,d,p)
if colors.supported then
return pdfcolor(model,registercolor(nil,'spot',n,f,d,p)) -- incorrect
else
return ""
end
end
function lpdf.transparencycode(a,t)
if transparencies.supported then
intransparency = true
return format("/Tr%s gs",registertransparancy(nil,a,t,true)) -- true forces resource
else
return ""
end
end
function lpdf.finishtransparencycode()
if transparencies.supported and intransparency then
intransparency = false
return "/Tr0 gs" -- we happen to know this -)
else
return ""
end
end
-- this will move to lpdf-spe.lua
backends.pdf.tables.vfspecials = { -- todo: distinguish between glyph and rule color
red = { "special", 'pdf: 1 0 0 rg 1 0 0 RG' },
green = { "special", 'pdf: 0 1 0 rg 0 1 0 RG' },
blue = { "special", 'pdf: 0 0 1 rg 0 0 1 RG' },
black = { "special", 'pdf: 0 g 0 G' },
startslant = function(a) return { "special", format("pdf: q 1 0 %s 1 0 0 cm",a) } end,
stopslant = { "special", "pdf: Q" },
}
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