diff options
Diffstat (limited to 'luaotfload-colors.lua')
| -rw-r--r-- | luaotfload-colors.lua | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/luaotfload-colors.lua b/luaotfload-colors.lua index b5c1fb9..b8ecb87 100644 --- a/luaotfload-colors.lua +++ b/luaotfload-colors.lua @@ -126,19 +126,12 @@ registerotffeature { --- something is carried around in ``res`` --- for later use by color_handler() --- but what? -local res --- <- state of what? +local res = nil --- float -> unit local function pageresources(alpha) - local res2 - if not res then - res = "/TransGs1<</ca 1/CA 1>>" - end - res2 = stringformat("/TransGs%s<</ca %s/CA %s>>", - alpha, alpha, alpha) - res = stringformat("%s%s", - res, - stringfind(res, res2) and "" or res2) + res = res or {} + res[alpha] = true end --- we store results of below color handler as tuples of @@ -280,17 +273,25 @@ end --- node -> node local color_handler = function (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 new_head = 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 + if res then + res["1"] = true + local tpr, t = tex.pdfpageresources, "" + for k in pairs(res) do + local str = stringformat("/TransGs%s<</ca %s/CA %s>>", k, k, k) + if not stringfind(tpr,str) then + t = t .. str + end + end + if t ~= "" then + if not stringfind(tpr,"/ExtGState<<.*>>") then + tpr = tpr.."/ExtGState<<>>" + end + tpr = stringgsub(tpr,"/ExtGState<<","%1"..t) + tex.pdfpageresources = tpr + end + res = nil -- reset res end return new_head end |