summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/luatex/luaotfload/fontloader-font-imp-italics.lua
blob: 83c785d387689e433f9cf9038ca99853a7c986b2 (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
if not modules then modules = { } end modules ['font-imp-italics'] = {
    version   = 1.001,
    comment   = "companion to font-ini.mkiv and hand-ini.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local next = next

local fonts              = fonts
local handlers           = fonts.handlers
local registerotffeature = handlers.otf.features.register
local registerafmfeature = handlers.afm.features.register

local function initialize(tfmdata,key,value)
    for unicode, character in next, tfmdata.characters do
        local olditalic = character.italic
        if olditalic and olditalic ~= 0 then
            character.width  = character.width + olditalic
            character.italic = 0
        end
    end
end

local specification = {
    name        = "italicwidths",
    description = "add italic to width",
    manipulators = {
        base = initialize,
        node = initialize, -- only makes sense for math
    }
}

registerotffeature(specification)
registerafmfeature(specification)

local function initialize(tfmdata,value) -- hm, always value
    if value then
        -- the magic 40 and it formula come from Dohyun Kim but we might need another guess
        local parameters = tfmdata.parameters
        local italicangle = parameters.italicangle
        if italicangle and italicangle ~= 0 then
            local properties = tfmdata.properties
            local factor = tonumber(value) or 1
            properties.hasitalics = true
            properties.autoitalicamount = factor * (parameters.uwidth or 40)/2
        end
    end
end

local specification = {
    name         = "itlc",
    description  = "italic correction",
    initializers = {
        base = initialize,
        node = initialize,
    }
}

registerotffeature(specification)
registerafmfeature(specification)

if context then

    local function initialize(tfmdata,value) -- yes no delay
        tfmdata.properties.textitalics = toboolean(value)
    end

    local specification = {
        name         = "textitalics",
        description  = "use alternative text italic correction",
        initializers = {
            base = initialize,
            node = initialize,
        }
    }

    registerotffeature(specification)
    registerafmfeature(specification)

end

-- no longer used

-- if context then
--
--  -- local function initializemathitalics(tfmdata,value) -- yes no delay
--  --     tfmdata.properties.mathitalics = toboolean(value)
--  -- end
--  --
--  -- local specification = {
--  --     name         = "mathitalics",
--  --     description  = "use alternative math italic correction",
--  --     initializers = {
--  --         base = initializemathitalics,
--  --         node = initializemathitalics,
--  --     }
--  -- }
--  --
--  -- registerotffeature(specification)
--  -- registerafmfeature(specification)
--
-- end

-- -- also not used, only when testing

if context then

    local letter = characters.is_letter
    local always = true

    local function collapseitalics(tfmdata,key,value)
        local threshold = value == true and 100 or tonumber(value)
        if threshold and threshold > 0 then
            if threshold > 100 then
                threshold = 100
            end
            for unicode, data in next, tfmdata.characters do
                if always or letter[unicode] or letter[data.unicode] then
                    local italic = data.italic
                    if italic and italic ~= 0 then
                        local width = data.width
                        if width and width ~= 0 then
                            local delta = threshold * italic / 100
                            data.width  = width  + delta
                            data.italic = italic - delta
                        end
                    end
                end
            end
        end
    end

    local dimensions_specification = {
        name        = "collapseitalics",
        description = "collapse italics",
        manipulators = {
            base = collapseitalics,
            node = collapseitalics,
        }
    }

    registerotffeature(dimensions_specification)
    registerafmfeature(dimensions_specification)

end