Rename |otfl-font-msc.lua| to |otfl-font-clr.lua|

It deals with colors only now.

1 files changed, 168 insertions, 0 deletions

diff --git a/otfl-font-clr.lua b/otfl-font-clr.lua
new file mode 100644
index 0000000..622c9cf
--- /dev/null
+++ b/otfl-font-clr.lua
@@ -0,0 +1,168 @@
+if not modules then modules = { } end modules ['font-clr'] = {
+    version   = 1.001,
+    comment   = "companion to font-otf.lua (font color)",
+    author    = "Khaled Hosny",
+    copyright = "Khaled Hosny",
+    license   = "GPL"
+}
+
+fonts.triggers            = fonts.triggers            or { }
+fonts.initializers        = fonts.initializers        or { }
+fonts.initializers.common = fonts.initializers.common or { }
+
+local initializers, format = fonts.initializers, string.format
+
+table.insert(fonts.triggers,"color")
+
+function initializers.common.color(tfmdata,value)
+    if value then
+        tfmdata.color = value
+        luaotfload.add_color_callback()
+    end
+end
+
+initializers.base.otf.color = initializers.common.color
+initializers.node.otf.color = initializers.common.color
+
+local function hex2dec(hex,one)
+    if one then
+        return format("%.1g", tonumber(hex, 16)/255)
+    else
+        return format("%.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 = format("/TransGs%s<</ca %s/CA %s>>", a, a, a)
+    res  = format("%s%s", res, res:find(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    = hex:find('(..)(..)(..)')
+        elseif #hex == 8 then
+            _, _, r, g, b, a = hex:find('(..)(..)(..)(..)')
+            a                = hex2dec(a,true)
+            pageresources(a)
+        end
+    else
+        return nil
+    end
+    r = hex2dec(r)
+    g = hex2dec(g)
+    b = hex2dec(b)
+    if a then
+        push = format('/TransGs%g gs %s %s %s rg', a, r, g, b)
+        pop  = '0 g /TransGs1 gs'
+    else
+        push = format('%s %s %s rg', r, g, b)
+        pop  = '0 g'
+    end
+    return push, pop
+end
+
+local glyph   = node.id('glyph')
+local hlist   = node.id('hlist')
+local vlist   = node.id('vlist')
+local whatsit = node.id('whatsit')
+local pgi     = node.id('page_insert')
+local sbox    = node.id('sub_box')
+
+local function lookup_next_color(head)
+    for n in node.traverse(head) do
+        if n.id == glyph then
+            if fonts.ids[n.font] and fonts.ids[n.font].color then
+                return fonts.ids[n.font].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
+
+function luaotfload.node_colorize(head, current_color, next_color)
+    for n in node.traverse(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 = luaotfload.node_colorize(n.list, current_color, next_color_in)
+        elseif n.id == glyph then
+            local tfmdata = fonts.ids[n.font]
+            if tfmdata and tfmdata.color then
+                if tfmdata.color ~= current_color then
+                    local pushcolor = hex_to_rgba(tfmdata.color)
+                    local push = node.new(whatsit, 8)
+                    push.mode  = 1
+                    push.data  = pushcolor
+                    head       = node.insert_before(head, n, push)
+                    current_color = tfmdata.color
+                end
+                local next_color_in = lookup_next_color (n.next) or next_color
+                if next_color_in ~= tfmdata.color then
+                    local _, popcolor = hex_to_rgba(tfmdata.color)
+                    local pop  = node.new(whatsit, 8)
+                    pop.mode   = 1
+                    pop.data   = popcolor
+                    head       = node.insert_after(head, n, pop)
+                    current_color = nil
+                end
+            end
+        end
+    end
+    return head, current_color
+end
+
+function luaotfload.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 = tex.pdfpageresources:gsub(r, "")
+   end
+   local h = luaotfload.node_colorize(head, nil, nil)
+   -- now append our page resources
+   if res and res:find("%S") then -- test for non-empty string
+      local r = "/ExtGState<<"..res..">>"
+      tex.pdfpageresources = tex.pdfpageresources..r
+   end
+   return h
+end
+
+luaotfload.color_callback_activated = 0
+local message_displayed = 0
+
+function luaotfload.add_color_callback()
+    if tex.luatexversion < 44 then
+        if message_displayed == 0 then
+            luatextra.module_warning("luaotfload","You must have a LuaTeX with version >= 0.44 in order to get colors working, colors won't work.")
+            message_displayed = 1
+        end
+    elseif luaotfload.color_callback_activated == 0 then
+        callback.add("pre_output_filter",    luaotfload.colorize, "loaotfload.colorize")
+        luaotfload.color_callback_activated = 1
+    end
+end
+
+function luaotfload.remove_color_callback()
+    if luaotfload.color_callback_activated == 1 then
+        callback.remove("pre_output_filter",    "loaotfload.colorize")
+        luaotfload.color_callback_activated = 0
+    end
+end