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Diffstat (limited to 'tex/context/base/attr-col.lua')
| -rw-r--r-- | tex/context/base/attr-col.lua | 500 |
1 files changed, 500 insertions, 0 deletions
diff --git a/tex/context/base/attr-col.lua b/tex/context/base/attr-col.lua new file mode 100644 index 000000000..0f40b8b99 --- /dev/null +++ b/tex/context/base/attr-col.lua @@ -0,0 +1,500 @@ +if not modules then modules = { } end modules ['attr-col'] = { + version = 1.001, + comment = "companion to attr-col.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +-- this module is being reconstructed and code will move to other places +-- we can also do the nsnone via a metatable and then also se index 0 + +local type = type +local format = string.format +local concat = table.concat + +local report_attributes = logs.new("attributes") +local report_colors = logs.new("colors") +local report_transparencies = logs.new("transparencies") + +local attributes, nodes = attributes, nodes + +-- todo: document this but first reimplement this as it reflects the early +-- days of luatex / mkiv and we have better ways now + +-- nb: attributes: color etc is much slower than normal (marks + literals) but ... +-- nb. too many "0 g"s + +local states = attributes.states +local tasks = nodes.tasks +local nodeinjections = backends.nodeinjections +local registrations = backends.registrations +local unsetvalue = attributes.unsetvalue + +-- We can distinguish between rules and glyphs but it's not worth the trouble. A +-- first implementation did that and while it saves a bit for glyphs and rules, it +-- costs more resourses for transparencies. So why bother. + +-- +-- colors +-- + +-- we can also collapse the two attributes: n, n+1, n+2 and then +-- at the tex end add 0, 1, 2, but this is not faster and less +-- flexible (since sometimes we freeze color attribute values at +-- the lua end of the game +-- +-- we also need to store the colorvalues because we need then in mp +-- +-- This is a compromis between speed and simplicity. We used to store the +-- values and data in one array, which made in neccessary to store the +-- converters that need node constructor into strings and evaluate them +-- at runtime (after reading from storage). Think of: +-- +-- colors.strings = colors.strings or { } +-- +-- if environment.initex then +-- colors.strings[color] = "return colors." .. colorspace .. "(" .. concat({...},",") .. ")" +-- end +-- +-- storage.register("attributes/colors/data", colors.strings, "attributes.colors.data") -- evaluated +-- +-- We assume that only processcolors are defined in the format. + +attributes.colors = attributes.colors or { } +local colors = attributes.colors _clib_ = colors -- fast access (less tokens too) +colors.data = colors.data or { } +colors.values = colors.values or { } +colors.registered = colors.registered or { } + +colors.weightgray = true +colors.attribute = attributes.private('color') +colors.selector = attributes.private('colormodel') +colors.default = 1 +colors.main = nil +colors.triggering = true +colors.supported = true + +storage.register("attributes/colors/values", colors.values, "attributes.colors.values") +storage.register("attributes/colors/registered", colors.registered, "attributes.colors.registered") + +local templates = { + rgb = "r:%s:%s:%s", + cmyk = "c:%s:%s:%s:%s", + gray = "s:%s", + spot = "p:%s:%s:%s:%s" +} + +local models = { + [interfaces.variables.none] = unsetvalue, + black = unsetvalue, + bw = unsetvalue, + all = 1, + gray = 2, + rgb = 3, + cmyk = 4, +} + +colors.model = "all" + +local data = colors.data +local values = colors.values +local registered = colors.registered + +local numbers = attributes.numbers +local list = attributes.list + +local min, max, floor = math.min, math.max, math.floor + +local function rgbtocmyk(r,g,b) -- we could reduce + return 1-r, 1-g, 1-b, 0 +end + +local function cmyktorgb(c,m,y,k) + return 1.0 - min(1.0,c+k), 1.0 - min(1.0,m+k), 1.0 - min(1.0,y+k) +end + +local function rgbtogray(r,g,b) + if colors.weightgray then + return .30*r+.59*g+.11*b + else + return r/3+g/3+b/3 + end +end + +local function cmyktogray(c,m,y,k) + return rgbtogray(cmyktorgb(c,m,y,k)) +end + +-- http://en.wikipedia.org/wiki/HSI_color_space +-- http://nl.wikipedia.org/wiki/HSV_(kleurruimte) + +local function hsvtorgb(h,s,v) + -- h = h % 360 + local hd = h/60 + local hf = floor(hd) + local hi = hf % 6 + -- local f = hd - hi + local f = hd - hf + local p = v * (1 - s) + local q = v * (1 - f * s) + local t = v * (1 - (1 - f) * s) + if hi == 0 then + return v, t, p + elseif hi == 1 then + return q, v, p + elseif hi == 2 then + return p, v, t + elseif hi == 3 then + return p, q, v + elseif hi == 4 then + return t, p, v + elseif hi == 5 then + return v, p, q + else + print("error in hsv -> rgb",hi,h,s,v) + end +end + +local function rgbtohsv(r,g,b) + local offset, maximum, other_1, other_2 + if r >= g and r >= b then + offset, maximum, other_1, other_2 = 0, r, g, b + elseif g >= r and g >= b then + offset, maximum, other_1, other_2 = 2, g, b, r + else + offset, maximum, other_1, other_2 = 4, b, r, g + end + if maximum == 0 then + return 0, 0, 0 + end + local minimum = other_1 < other_2 and other_1 or other_2 + if maximum == minimum then + return 0, 0, maximum + end + local delta = maximum - minimum + return (offset + (other_1-other_2)/delta)*60, delta/maximum, maximum +end + +local function graytorgb(s) -- unweighted + return 1-s, 1-s, 1-s +end + +local function hsvtogray(h,s,v) + return rgb_to_gray(hsv_to_rgb(h,s,v)) +end + +local function graytohsv(s) + return 0, 0, s +end + +colors.rgbtocmyk = rgbtocmyk +colors.rgbtogray = rgbtogray +colors.cmyktorgb = cmyktorgb +colors.cmyktogray = cmyktogray +colors.rgbtohsv = rgbtohsv +colors.hsvtorgb = hsvtorgb +colors.hsvtogray = hsvtogray +colors.graytohsv = graytohsv + +-- we can share some *data by using s, rgb and cmyk hashes, but +-- normally the amount of colors is not that large; storing the +-- components costs a bit of extra runtime, but we expect to gain +-- some back because we have them at hand; the number indicates the +-- default color space + +function colors.gray(s) + return { 2, s, s, s, s, 0, 0, 0, 1-s } +end + +function colors.rgb(r,g,b) + local s = rgbtogray(r,g,b) + local c, m, y, k = rgbtocmyk(r,g,b) + return { 3, s, r, g, b, c, m, y, k } +end + +function colors.cmyk(c,m,y,k) + local s = cmyktogray(c,m,y,k) + local r, g, b = cmyktorgb(c,m,y,k) + return { 4, s, r, g, b, c, m, y, k } +end + +--~ function colors.spot(parent,f,d,p) +--~ return { 5, .5, .5, .5, .5, 0, 0, 0, .5, parent, f, d, p } +--~ end + +function colors.spot(parent,f,d,p) + if type(p) == "number" then + local n = list[numbers.color][parent] -- hard coded ref to color number + if n then + local v = values[n] + if v then + -- the via cmyk hack is dirty, but it scales better + local c, m, y, k = p*v[6], p*v[7], p*v[8], p*v[8] + local r, g, b = cmyktorgb(c,m,y,k) + local s = cmyktogray(c,m,y,k) + return { 5, s, r, g, b, c, m, y, k, parent, f, d, p } + end + end + else + -- todo, multitone (maybe p should be a table) + end + return { 5, .5, .5, .5, .5, 0, 0, 0, .5, parent, f, d, p } +end + +local function graycolor(...) graycolor = nodeinjections.graycolor return graycolor(...) end +local function rgbcolor (...) rgbcolor = nodeinjections.rgbcolor return rgbcolor (...) end +local function cmykcolor(...) cmykcolor = nodeinjections.cmykcolor return cmykcolor(...) end +local function spotcolor(...) spotcolor = nodeinjections.spotcolor return spotcolor(...) end + +local function extender(colors,key) + if colors.supported and key == "none" then + local d = graycolor(0) + colors.none = d + return d + end +end + +local function reviver(data,n) + if colors.supported then + local v = values[n] + local d + if not v then + local gray = graycolor(0) + d = { gray, gray, gray, gray } + report_attributes("unable to revive color %s",n or "?") + else + local kind = colors.forcedmodel(v[1]) + if kind == 2 then + local gray= graycolor(v[2]) + d = { gray, gray, gray, gray } + elseif kind == 3 then + local gray, rgb, cmyk = graycolor(v[2]), rgbcolor(v[3],v[4],v[5]), cmykcolor(v[6],v[7],v[8],v[9]) + d = { rgb, gray, rgb, cmyk } + elseif kind == 4 then + local gray, rgb, cmyk = graycolor(v[2]), rgbcolor(v[3],v[4],v[5]), cmykcolor(v[6],v[7],v[8],v[9]) + d = { cmyk, gray, rgb, cmyk } + elseif kind == 5 then + local spot = spotcolor(v[10],v[11],v[12],v[13]) + -- d = { spot, gray, rgb, cmyk } + d = { spot, spot, spot, spot } + end + end + data[n] = d + return d + end +end + +setmetatable(colors, { __index = extender }) +setmetatable(colors.data, { __index = reviver }) + +function colors.filter(n) + return concat(data[n],":",5) +end + +function colors.setmodel(name,weightgray) + colors.model = name + colors.default = models[name] or 1 + colors.weightgray = weightgray ~= false + return colors.default +end + +function colors.register(name, colorspace, ...) -- passing 9 vars is faster (but not called that often) + local stamp = format(templates[colorspace],...) + local color = registered[stamp] + if not color then + color = #values + 1 + values[color] = colors[colorspace](...) + registered[stamp] = color + -- colors.reviver(color) + end + if name then + list[colors.attribute][name] = color -- not grouped, so only global colors + end + return registered[stamp] +end + +function colors.value(id) + return values[id] +end + +attributes.colors.handler = nodes.install_attribute_handler { + name = "color", + namespace = colors, + initializer = states.initialize, + finalizer = states.finalize, + processor = states.selective, + resolver = function() return colors.main end, +} + +function colors.enable(value) + if value == false or not colors.supported then + tasks.disableaction("shipouts","attributes.colors.handler") + else + tasks.enableaction("shipouts","attributes.colors.handler") + end +end + +function colors.forcesupport(value) -- can move to attr-div + colors.supported = value + report_colors("color is %ssupported",value and "" or "not ") + colors.enable(value) +end + +-- transparencies + +attributes.transparencies = attributes.transparencies or { } +local transparencies = attributes.transparencies _tlib_ = transparencies -- fast access (less tokens too) +transparencies.registered = transparencies.registered or { } +transparencies.data = transparencies.data or { } +transparencies.values = transparencies.values or { } +transparencies.triggering = true +transparencies.attribute = attributes.private('transparency') +transparencies.supported = true + +storage.register("attributes/transparencies/registered", transparencies.registered, "attributes.transparencies.registered") +storage.register("attributes/transparencies/values", transparencies.values, "attributes.transparencies.values") + +local registered = transparencies.registered -- we could use a 2 dimensional table instead +local data = transparencies.data +local values = transparencies.values +local template = "%s:%s" + +local function inject_transparency (...) + inject_transparency = nodeinjections.transparency + return inject_transparency(...) +end + +local function register_transparency(...) + register_transparency = registrations.transparency + return register_transparency(...) +end + +function transparencies.register(name,a,t,force) -- name is irrelevant here (can even be nil) + -- Force needed here for metapost converter. We could always force + -- but then we'd end up with transparencies resources even if we + -- would not use transparencies (but define them only). This is + -- somewhat messy. + local stamp = format(template,a,t) + local n = registered[stamp] + if not n then + n = #values + 1 + values[n] = { a, t } + registered[stamp] = n + if force then + register_transparency(n,a,t) + end + elseif force and not data[n] then + register_transparency(n,a,t) + end + return registered[stamp] +end + +local function extender(transparencies,key) + if colors.supported and key == "none" then + local d = inject_transparency(0) + transparencies.none = d + return d + end +end + +local function reviver(data,n) + if transparencies.supported then + local v = values[n] + local d + if not v then + d = inject_transparency(0) + else + d = inject_transparency(n) + register_transparency(n,v[1],v[2]) + end + data[n] = d + return d + else + return "" + end +end + +setmetatable(transparencies, { __index = extender }) +setmetatable(transparencies.data, { __index = reviver }) -- register if used + +-- check if there is an identity + +function transparencies.value(id) + return values[id] +end + +attributes.transparencies.handler = nodes.install_attribute_handler { + name = "transparency", + namespace = transparencies, + initializer = states.initialize, + finalizer = states.finalize, + processor = states.process, +} + +function transparencies.enable(value) -- nil is enable + if value == false or not transparencies.supported then + tasks.disableaction("shipouts","attributes.transparencies.handler") + else + tasks.enableaction("shipouts","attributes.transparencies.handler") + end +end + +function transparencies.forcesupport(value) -- can move to attr-div + transparencies.supported = value + report_transparencies("transparency is %ssupported",value and "" or "not ") + transparencies.enable(value) +end + +--- colorintents: overprint / knockout + +attributes.colorintents = attributes.colorintents or {} +local colorintents = attributes.colorintents +colorintents.data = colorintents.data or { } +colorintents.attribute = attributes.private('colorintent') + +colorintents.registered = { + overprint = 1, + knockout = 2, +} + +local data, registered = colorintents.data, colorintents.registered + +local function extender(colorintents,key) + if key == "none" then + local d = data[2] + colorintents.none = d + return d + end +end + +local function reviver(data,n) + if n == 1 then + local d = nodeinjections.overprint() -- called once + data[1] = d + return d + elseif n == 2 then + local d = nodeinjections.knockout() -- called once + data[2] = d + return d + end +end + +setmetatable(colorintents, { __index = extender }) +setmetatable(colorintents.data, { __index = reviver }) + +function colorintents.register(stamp) + return registered[stamp] or registered.overprint +end + +attributes.colorintents.handler = nodes.install_attribute_handler { + name = "colorintent", + namespace = colorintents, + initializer = states.initialize, + finalizer = states.finalize, + processor = states.process, +} + +function colorintents.enable() + tasks.enableaction("shipouts","attributes.colorintents.handler") +end |