summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/context/base/attr-col.lua
blob: c592d1dc1cb294fb896a4084fc43aca3b115e8fa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
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

-- list could as well refer to the tables (instead of numbers that
-- index into another table) .. depends on what we need

local type = type
local format = string.format
local concat = table.concat

local attributes, nodes = attributes, nodes

local allocate              = utilities.storage.allocate
local setmetatableindex     = table.setmetatableindex

local report_attributes     = logs.reporter("attributes","colors")
local report_colors         = logs.reporter("colors","support")
local report_transparencies = logs.reporter("transparencies","support")

-- 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

local a_color     = attributes.private('color')
local a_selector  = attributes.private('colormodel')

colors.data       = allocate()
colors.values     = colors.values or { }
colors.registered = colors.registered or { }
colors.weightgray = true
colors.attribute  = a_color
colors.selector   = a_selector
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 model = colors.forcedmodel(v[1])
            if model == 2 then
                local gray= graycolor(v[2])
                d = { gray, gray, gray, gray }
            elseif model == 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 model == 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 model == 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

setmetatableindex(colors, extender)
setmetatableindex(colors.data, 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[a_color][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.installattributehandler {
    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

local a_transparency      = attributes.private('transparency')

attributes.transparencies = attributes.transparencies or { }
local transparencies      = attributes.transparencies
transparencies.registered = transparencies.registered or { }
transparencies.data       = allocate()
transparencies.values     = transparencies.values or { }
transparencies.triggering = true
transparencies.attribute  = a_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
    if name then
        list[a_transparency][name] = n -- not grouped, so only global transparencies
    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

setmetatableindex(transparencies, extender)
setmetatableindex(transparencies.data, reviver) -- register if used

-- check if there is an identity

function transparencies.value(id)
    return values[id]
end

attributes.transparencies.handler = nodes.installattributehandler {
    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       = allocate() -- colorintents.data or { }
colorintents.attribute  = attributes.private('colorintent')

colorintents.registered = allocate {
    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

setmetatableindex(colorintents, extender)
setmetatableindex(colorintents.data, reviver)

function colorintents.register(stamp)
    return registered[stamp] or registered.overprint
end

colorintents.handler = nodes.installattributehandler {
    name        = "colorintent",
    namespace   = colorintents,
    initializer = states.initialize,
    finalizer   = states.finalize,
    processor   = states.process,
}

function colorintents.enable()
    tasks.enableaction("shipouts","attributes.colorintents.handler")
end

-- interface

commands.enablecolor        = colors.enable
commands.enabletransparency = transparencies.enable
commands.enablecolorintents = colorintents.enable

function commands.registercolor       (...) context(colors        .register(...)) end
function commands.registertransparency(...) context(transparencies.register(...)) end
function commands.registercolorintent (...) context(colorintents  .register(...)) end