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-rw-r--r--luaotfload.dtx70
1 files changed, 70 insertions, 0 deletions
diff --git a/luaotfload.dtx b/luaotfload.dtx
index cc33913..36e0841 100644
--- a/luaotfload.dtx
+++ b/luaotfload.dtx
@@ -648,6 +648,76 @@ initializers.base.otf.extend = initializers.common.extend
initializers.node.otf.extend = initializers.common.extend
% \end{macrocode}
+%
+% Support for font color.
+%
+% \begin{macrocode}
+
+table.insert(fonts.triggers,"color")
+
+function initializers.common.color(tfmdata,value)
+ if value then
+ tfmdata.color = value
+ end
+end
+
+initializers.base.otf.color = initializers.common.color
+initializers.node.otf.color = initializers.common.color
+
+local function hex_to_rgba(hex)
+ local r, g, b, a, color
+ if hex and #hex == 6 then
+ _, _, r, g, b = hex:find('(..)(..)(..)')
+ elseif #hex == 8 then
+ _, _, r, g, b, a = hex:find('(..)(..)(..)(..)')
+ else
+ return nil
+ end
+ r = tonumber(r, 16)/255
+ g = tonumber(g, 16)/255
+ b = tonumber(b, 16)/255
+ color = string.format("%.3g %.3g %.3g rg", r, g, b)
+ return color
+end
+
+local glyph = node.id('glyph')
+local hlist = node.id('hlist')
+local vlist = node.id('vlist')
+
+local function colorize(head)
+ for n in node.traverse(head) do
+ if n.id == hlist or n.id == vlist then
+ colorize(n.list)
+ end
+ if n.id == glyph then
+ local tfmdata = fonts.ids[n.font]
+ if tfmdata and tfmdata.color then
+ local prev = n.prev
+ local next = n.next
+ if prev.id == glyph and fonts.ids[prev.font].color == tfmdata.color then
+ else
+ local push = node.new(node.id("whatsit"), 8)
+ push.mode = 2
+ push.data = hex_to_rgba(tfmdata.color)
+ head = node.insert_before(head, n, push)
+ end
+ if next.id == glyph and fonts.ids[next.font].color == tfmdata.color then
+ else
+ local pop = node.new(node.id("whatsit"), 8)
+ pop.mode = 2
+ pop.data = "0 g"
+ head = node.insert_after(head, n, pop)
+ end
+ end
+ end
+ end
+ return head
+end
+
+callback.add("hpack_filter", colorize, "Font color")
+callback.add("pre_linebreak_filter", colorize, "Font color")
+
+% \end{macrocode}
% \iffalse
%</font-msc>
% \fi