[cairo] Some pango attributes not making it to cairo

[Simon Cozens]

Hello all,
	I'm using Pango to shape some text and Cairo to output it (using 
pango_cairo_show_glyph_string). I'm using Pango's attributes to determine what 
I want the text to look like. Most of the time this works fine, but some 
attributes are not working. Here's the (lua) code I have:


local lgi = require("lgi");
local cairo = lgi.cairo;
local surface = cairo.PdfSurface.create("foo.pdf", 300,300)
local cr = cairo.Context.create(surface)
cr:set_source_rgb(0,0,0)
local x = 50
local pango = lgi.Pango

local pal = pango.AttrList.new();

pal:insert(pango.Attribute.style_new(pango.Style.ITALIC))
pal:insert(pango.Attribute.weight_new(700))
pal:insert(pango.Attribute.strikethrough_new(true))
pal:insert(pango.Attribute.underline_new(pango.Underline.DOUBLE))
pal:insert(pango.Attribute.foreground_new(65535,0,0))

local fm = lgi.PangoCairo.FontMap.get_default()
local pango_context = lgi.Pango.FontMap.create_context(fm)
local s = "Hello world"
items = pango.itemize(pango_context, s, 0, string.len(s), pal, nil)

for i in pairs(items) do
	local offset = items[i].offset
	local length = items[i].length
	local analysis = items[i].analysis
	local pgs = pango.GlyphString.new()
	pango.shape(string.sub(s,1+offset), length, analysis, pgs)
	cr:move_to(x, 50)
	cr:show_glyph_string(analysis.font, pgs)
	x = x + pgs:get_width()/1024
end
cr:show_page();



This produces italic, boldface text, but with no colors and no underline and 
strikethrough. Is cairo meant to render those attributes, or am I supposed to 
be handling them manually?

Thanks,
Simon