[*] move source files to ./src

1 files changed, 272 insertions, 0 deletions

diff --git a/src/luaotfload-fonts-ext.lua b/src/luaotfload-fonts-ext.lua
new file mode 100644
index 0000000..b60d045
--- /dev/null
+++ b/src/luaotfload-fonts-ext.lua
@@ -0,0 +1,272 @@
+if not modules then modules = { } end modules ['luatex-fonts-ext'] = {
+    version   = 1.001,
+    comment   = "companion to luatex-*.tex",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+if context then
+    texio.write_nl("fatal error: this module is not for context")
+    os.exit()
+end
+
+local fonts       = fonts
+local otffeatures = fonts.constructors.newfeatures("otf")
+
+-- A few generic extensions.
+
+local function initializeitlc(tfmdata,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
+
+otffeatures.register {
+    name        = "itlc",
+    description = "italic correction",
+    initializers = {
+        base = initializeitlc,
+        node = initializeitlc,
+    }
+}
+
+-- slant and extend
+
+local function initializeslant(tfmdata,value)
+    value = tonumber(value)
+    if not value then
+        value =  0
+    elseif value >  1 then
+        value =  1
+    elseif value < -1 then
+        value = -1
+    end
+    tfmdata.parameters.slantfactor = value
+end
+
+otffeatures.register {
+    name        = "slant",
+    description = "slant glyphs",
+    initializers = {
+        base = initializeslant,
+        node = initializeslant,
+    }
+}
+
+local function initializeextend(tfmdata,value)
+    value = tonumber(value)
+    if not value then
+        value =  0
+    elseif value >  10 then
+        value =  10
+    elseif value < -10 then
+        value = -10
+    end
+    tfmdata.parameters.extendfactor = value
+end
+
+otffeatures.register {
+    name        = "extend",
+    description = "scale glyphs horizontally",
+    initializers = {
+        base = initializeextend,
+        node = initializeextend,
+    }
+}
+
+-- expansion and protrusion
+
+fonts.protrusions        = fonts.protrusions        or { }
+fonts.protrusions.setups = fonts.protrusions.setups or { }
+
+local setups = fonts.protrusions.setups
+
+local function initializeprotrusion(tfmdata,value)
+    if value then
+        local setup = setups[value]
+        if setup then
+            local factor, left, right = setup.factor or 1, setup.left or 1, setup.right or 1
+            local emwidth = tfmdata.parameters.quad
+            tfmdata.parameters.protrusion = {
+                auto = true,
+            }
+            for i, chr in next, tfmdata.characters do
+                local v, pl, pr = setup[i], nil, nil
+                if v then
+                    pl, pr = v[1], v[2]
+                end
+                if pl and pl ~= 0 then chr.left_protruding  = left *pl*factor end
+                if pr and pr ~= 0 then chr.right_protruding = right*pr*factor end
+            end
+        end
+    end
+end
+
+otffeatures.register {
+    name        = "protrusion",
+    description = "shift characters into the left and or right margin",
+    initializers = {
+        base = initializeprotrusion,
+        node = initializeprotrusion,
+    }
+}
+
+fonts.expansions         = fonts.expansions        or { }
+fonts.expansions.setups  = fonts.expansions.setups or { }
+
+local setups = fonts.expansions.setups
+
+local function initializeexpansion(tfmdata,value)
+    if value then
+        local setup = setups[value]
+        if setup then
+            local factor = setup.factor or 1
+            tfmdata.parameters.expansion = {
+                stretch = 10 * (setup.stretch or 0),
+                shrink  = 10 * (setup.shrink  or 0),
+                step    = 10 * (setup.step    or 0),
+                auto    = true,
+            }
+            for i, chr in next, tfmdata.characters do
+                local v = setup[i]
+                if v and v ~= 0 then
+                    chr.expansion_factor = v*factor
+                else -- can be option
+                    chr.expansion_factor = factor
+                end
+            end
+        end
+    end
+end
+
+otffeatures.register {
+    name        = "expansion",
+    description = "apply hz optimization",
+    initializers = {
+        base = initializeexpansion,
+        node = initializeexpansion,
+    }
+}
+
+-- left over
+
+function fonts.loggers.onetimemessage() end
+
+-- example vectors
+
+local byte = string.byte
+
+fonts.expansions.setups['default'] = {
+
+    stretch = 2, shrink = 2, step = .5, factor = 1,
+
+    [byte('A')] = 0.5, [byte('B')] = 0.7, [byte('C')] = 0.7, [byte('D')] = 0.5, [byte('E')] = 0.7,
+    [byte('F')] = 0.7, [byte('G')] = 0.5, [byte('H')] = 0.7, [byte('K')] = 0.7, [byte('M')] = 0.7,
+    [byte('N')] = 0.7, [byte('O')] = 0.5, [byte('P')] = 0.7, [byte('Q')] = 0.5, [byte('R')] = 0.7,
+    [byte('S')] = 0.7, [byte('U')] = 0.7, [byte('W')] = 0.7, [byte('Z')] = 0.7,
+    [byte('a')] = 0.7, [byte('b')] = 0.7, [byte('c')] = 0.7, [byte('d')] = 0.7, [byte('e')] = 0.7,
+    [byte('g')] = 0.7, [byte('h')] = 0.7, [byte('k')] = 0.7, [byte('m')] = 0.7, [byte('n')] = 0.7,
+    [byte('o')] = 0.7, [byte('p')] = 0.7, [byte('q')] = 0.7, [byte('s')] = 0.7, [byte('u')] = 0.7,
+    [byte('w')] = 0.7, [byte('z')] = 0.7,
+    [byte('2')] = 0.7, [byte('3')] = 0.7, [byte('6')] = 0.7, [byte('8')] = 0.7, [byte('9')] = 0.7,
+}
+
+fonts.protrusions.setups['default'] = {
+
+    factor = 1, left = 1, right = 1,
+
+    [0x002C] = { 0, 1    }, -- comma
+    [0x002E] = { 0, 1    }, -- period
+    [0x003A] = { 0, 1    }, -- colon
+    [0x003B] = { 0, 1    }, -- semicolon
+    [0x002D] = { 0, 1    }, -- hyphen
+    [0x2013] = { 0, 0.50 }, -- endash
+    [0x2014] = { 0, 0.33 }, -- emdash
+    [0x3001] = { 0, 1    }, -- ideographic comma      、
+    [0x3002] = { 0, 1    }, -- ideographic full stop  。
+    [0x060C] = { 0, 1    }, -- arabic comma           ،
+    [0x061B] = { 0, 1    }, -- arabic semicolon       ؛
+    [0x06D4] = { 0, 1    }, -- arabic full stop       ۔
+
+}
+
+-- normalizer
+
+fonts.handlers.otf.features.normalize = function(t)
+    if t.rand then
+        t.rand = "random"
+    end
+    return t
+end
+
+-- bonus
+
+function fonts.helpers.nametoslot(name)
+    local t = type(name)
+    if t == "string" then
+        local tfmdata = fonts.hashes.identifiers[currentfont()]
+        local shared  = tfmdata and tfmdata.shared
+        local fntdata = shared and shared.rawdata
+        return fntdata and fntdata.resources.unicodes[name]
+    elseif t == "number" then
+        return n
+    end
+end
+
+-- \font\test=file:somefont:reencode=mymessup
+--
+--  fonts.encodings.reencodings.mymessup = {
+--      [109] = 110, -- m
+--      [110] = 109, -- n
+--  }
+
+fonts.encodings             = fonts.encodings or { }
+local reencodings           = { }
+fonts.encodings.reencodings = reencodings
+
+local function specialreencode(tfmdata,value)
+    -- we forget about kerns as we assume symbols and we
+    -- could issue a message if ther are kerns but it's
+    -- a hack anyway so we odn't care too much here
+    local encoding = value and reencodings[value]
+    if encoding then
+        local temp = { }
+        local char = tfmdata.characters
+        for k, v in next, encoding do
+            temp[k] = char[v]
+        end
+        for k, v in next, temp do
+            char[k] = temp[k]
+        end
+        -- if we use the font otherwise luatex gets confused so
+        -- we return an additional hash component for fullname
+        return string.format("reencoded:%s",value)
+    end
+end
+
+local function reencode(tfmdata,value)
+    tfmdata.postprocessors = tfmdata.postprocessors or { }
+    table.insert(tfmdata.postprocessors,
+        function(tfmdata)
+            return specialreencode(tfmdata,value)
+        end
+    )
+end
+
+otffeatures.register {
+    name         = "reencode",
+    description  = "reencode characters",
+    manipulators = {
+        base = reencode,
+        node = reencode,
+    }
+}