move to human-readable names 1

1 files changed, 187 insertions, 0 deletions

diff --git a/luaotfload-colors.lua b/luaotfload-colors.lua
new file mode 100644
index 0000000..3d8bfab
--- /dev/null
+++ b/luaotfload-colors.lua
@@ -0,0 +1,187 @@
+if not modules then modules = { } end modules ['luaotfload-colors'] = {
+    version   = 1.001,
+    comment   = "companion to luaotfload.lua (font color)",
+    author    = "Khaled Hosny and Elie Roux",
+    copyright = "Luaotfload Development Team",
+    license   = "GPL"
+}
+
+local newnode            = node.new
+local nodetype           = node.id
+local traverse_nodes     = node.traverse
+local insert_node_before = node.insert_before
+local insert_node_after  = node.insert_after
+
+local stringformat = string.format
+local stringgsub   = string.gsub
+local stringfind   = string.find
+
+local otffeatures        = fonts.constructors.newfeatures("otf")
+local ids                = fonts.hashes.identifiers
+local registerotffeature = otffeatures.register
+
+local function setcolor(tfmdata,value)
+    local sanitized
+    local properties = tfmdata.properties
+
+    if value then
+        value = tostring(value)
+        if #value == 6 or #value == 8 then
+            sanitized = value
+        elseif #value == 7 then
+            _, _, sanitized = stringfind(value, "(......)")
+        elseif #value > 8 then
+            _, _, sanitized = stringfind(value, "(........)")
+        else
+            -- broken color code ignored, issue a warning?
+        end
+    end
+
+    if sanitized then
+        tfmdata.properties.color = sanitized
+        add_color_callback()
+    end
+end
+
+registerotffeature {
+    name        = "color",
+    description = "color",
+    initializers = {
+        base = setcolor,
+        node = setcolor,
+    }
+}
+
+local function hex2dec(hex,one)
+    if one then
+        return stringformat("%.1g", tonumber(hex, 16)/255)
+    else
+        return stringformat("%.3g", tonumber(hex, 16)/255)
+    end
+end
+
+local res
+
+local function pageresources(a)
+    local res2
+    if not res then
+       res = "/TransGs1<</ca 1/CA 1>>"
+    end
+    res2 = stringformat("/TransGs%s<</ca %s/CA %s>>", a, a, a)
+    res  = stringformat("%s%s", res, stringfind(res, res2) and "" or res2)
+end
+
+local function hex_to_rgba(hex)
+    local r, g, b, a, push, pop, res3
+    if hex then
+        if #hex == 6 then
+            _, _, r, g, b    = stringfind(hex, '(..)(..)(..)')
+        elseif #hex == 8 then
+            _, _, r, g, b, a = stringfind(hex, '(..)(..)(..)(..)')
+            a                = hex2dec(a,true)
+            pageresources(a)
+        end
+    else
+        return nil
+    end
+    r = hex2dec(r)
+    g = hex2dec(g)
+    b = hex2dec(b)
+    if a then
+        push = stringformat('/TransGs%g gs %s %s %s rg', a, r, g, b)
+        pop  = '0 g /TransGs1 gs'
+    else
+        push = stringformat('%s %s %s rg', r, g, b)
+        pop  = '0 g'
+    end
+    return push, pop
+end
+
+local glyph   = nodetype('glyph')
+local hlist   = nodetype('hlist')
+local vlist   = nodetype('vlist')
+local whatsit = nodetype('whatsit')
+local pgi     = nodetype('page_insert')
+local sbox    = nodetype('sub_box')
+
+local function lookup_next_color(head)
+    for n in traverse_nodes(head) do
+        if n.id == glyph then
+            if ids[n.font] and ids[n.font].properties and ids[n.font].properties.color then
+                return ids[n.font].properties.color
+            else
+                return -1
+            end
+        elseif n.id == vlist or n.id == hlist or n.id == sbox then
+            local r = lookup_next_color(n.list)
+            if r == -1 then
+                return -1
+            elseif r then
+                return r
+            end
+        elseif n.id == whatsit or n.id == pgi then
+            return -1
+        end
+    end
+    return nil
+end
+
+local function node_colorize(head, current_color, next_color)
+    for n in traverse_nodes(head) do
+        if n.id == hlist or n.id == vlist or n.id == sbox then
+            local next_color_in = lookup_next_color(n.next) or next_color
+            n.list, current_color = node_colorize(n.list, current_color, next_color_in)
+        elseif n.id == glyph then
+            local tfmdata = ids[n.font]
+            if tfmdata and tfmdata.properties  and tfmdata.properties.color then
+                if tfmdata.properties.color ~= current_color then
+                    local pushcolor = hex_to_rgba(tfmdata.properties.color)
+                    local push = newnode(whatsit, 8)
+                    push.mode  = 1
+                    push.data  = pushcolor
+                    head       = insert_node_before(head, n, push)
+                    current_color = tfmdata.properties.color
+                end
+                local next_color_in = lookup_next_color (n.next) or next_color
+                if next_color_in ~= tfmdata.properties.color then
+                    local _, popcolor = hex_to_rgba(tfmdata.properties.color)
+                    local pop  = newnode(whatsit, 8)
+                    pop.mode   = 1
+                    pop.data   = popcolor
+                    head       = insert_node_after(head, n, pop)
+                    current_color = nil
+                end
+            end
+        end
+    end
+    return head, current_color
+end
+
+local function font_colorize(head)
+   -- check if our page resources existed in the previous run
+   -- and remove it to avoid duplicating it later
+   if res then
+      local r = "/ExtGState<<"..res..">>"
+      tex.pdfpageresources = stringgsub(tex.pdfpageresources, r, "")
+   end
+   local h = node_colorize(head, nil, nil)
+   -- now append our page resources
+   if res and stringfind(res, "%S") then -- test for non-empty string
+      local r = "/ExtGState<<"..res..">>"
+      tex.pdfpageresources = tex.pdfpageresources..r
+   end
+   return h
+end
+
+local color_callback_activated = 0
+
+function add_color_callback()
+    if color_callback_activated == 0 then
+        luatexbase.add_to_callback(
+          "pre_output_filter", font_colorize, "luaotfload.colorize")
+        color_callback_activated = 1
+    end
+end
+
+-- vim:tw=71:sw=4:ts=4:expandtab
+