diff options
Diffstat (limited to 'tex/context/base/mkiv/colo-icc.lua')
| -rw-r--r-- | tex/context/base/mkiv/colo-icc.lua | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/colo-icc.lua b/tex/context/base/mkiv/colo-icc.lua new file mode 100644 index 000000000..f7ed561c1 --- /dev/null +++ b/tex/context/base/mkiv/colo-icc.lua @@ -0,0 +1,120 @@ +if not modules then modules = { } end modules ['colo-icc'] = { + version = 1.000, + comment = "companion to colo-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local char, byte, gsub, match, format, strip = string.char, string.byte, string.gsub, string.match, string.format, string.strip +local readstring, readnumber = io.readstring, io.readnumber +local formatters = string.formatters + +local colors = attributes and attributes.colors or { } -- when used in mtxrun + +local report_colors = logs.reporter("colors","icc") + +local R, Cs, lpegmatch = lpeg.R, lpeg.Cs, lpeg.match + +local invalid = R(char(0)..char(31)) +local cleaned = invalid^0 * Cs((1-invalid)^0) + +function colors.iccprofile(filename,verbose) + local fullname = resolvers.findfile(filename,"icc") or "" + if fullname == "" then + local locate = resolvers.finders.byscheme -- not in mtxrun + if locate then + fullname = locate("loc",filename) + end + end + if fullname == "" then + report_colors("profile %a cannot be found",filename) + return nil, false + end + local f = io.open(fullname,"rb") + if not f then + report_colors("profile %a cannot be loaded",fullname) + return nil, false + end + local header = { + size = readnumber(f,4), + cmmtype = readnumber(f,4), + version = readnumber(f,4), + deviceclass = strip(readstring(f,4)), + colorspace = strip(readstring(f,4)), + connectionspace = strip(readstring(f,4)), + datetime = { + year = readnumber(f,2), + month = readnumber(f,2), + day = readnumber(f,2), + hour = readnumber(f,2), + minutes = readnumber(f,2), + seconds = readnumber(f,2), + }, + filesignature = strip(readstring(f,4)), + platformsignature = strip(readstring(f,4)), + options = readnumber(f,4), + devicemanufacturer = strip(readstring(f,4)), + devicemodel = strip(readstring(f,4)), + deviceattributes = readnumber(f,4), + renderingintent = readnumber(f,4), + illuminantxyz = { + x = readnumber(f,4), + y = readnumber(f,4), + z = readnumber(f,4), + }, + profilecreator = readnumber(f,4), + id = strip(readstring(f,16)), + } + local tags = { } + for i=1,readnumber(f,128,4) do + tags[readstring(f,4)] = { + offset = readnumber(f,4), + length = readnumber(f,4), + } + end + local o = header.options + header.options = + o == 0 and "embedded" or + o == 1 and "dependent" or "unknown" + local d = header.deviceattributes + header.deviceattributes = { + [number.hasbit(d,1) and "transparency" or "reflective"] = true, + [number.hasbit(d,2) and "mate" or "glossy" ] = true, + [number.hasbit(d,3) and "negative" or "positive" ] = true, + [number.hasbit(d,4) and "bw" or "color" ] = true, + } + local r = header.renderingintent + header.renderingintent = + r == 0 and "perceptual" or + r == 1 and "relative" or + r == 2 and "saturation" or + r == 3 and "absolute" or "unknown" + for tag, spec in next, tags do + if tag then + local offset, length = spec.offset, spec.length + local variant = readstring(f,offset,4) + if variant == "text" or variant == "desc" then + local str = readstring(f,length-4) + tags[tag] = { + data = str, + cleaned = lpegmatch(cleaned,str), + } + else + if verbose then + report_colors("ignoring tag %a or type %a in profile %a",tag,variant,fullname) + end + tags[tag] = nil + end + end + end + f:close() + local profile = { + filename = filename, + fullname = fullname, + header = header, + tags = tags, + } + report_colors("profile %a loaded",fullname) + return profile, true +end |