gmod-disguiser/lua/autorun/client/patch_createfont.lua

--
-- Disguiser SWEP - Lets you disguise as any prop on a map.
--
-- File:
--   patch_createfont.lua
--
-- Purpose:
--   This code will allow any font to be checked for existence. I hope it works
--   as it is only a function patch which should be loaded right at the beginning.
--   Can't guarantee that it loads right at the beginning though.
--
-- Copyright (C) 2013 Carl Kittelberger (Icedream)
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as
-- published by the Free Software Foundation, either version 3 of the
-- License, or (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program.  If not, see <http://www.gnu.org/licenses/>.

print("[Disguiser] Loading compatibility layer for surface.CreateFont...")

local registered_fonts = {}

-- Function already patched by us?
if not surface.__createFont == nil then
	MsgC(Color(255, 255, 0), "[Fontpatch] Can't patch surface.CreateFont, already patched. Skipping patch.\n")
	return
end

-- Original function
surface.__createFont = surface.CreateFont

-- Patch function
function surface.CreateFont(name, data)
	if not name or not data then return false end

	if registered_fonts[name] then
		MsgN("[Fontpatch] Skipping font " .. name .. ", already registered")
	else
		MsgN("[Fontpatch] Registering font " .. name .. "...")
	end
	registered_fonts[name] = true
	surface.__createFont(name, data)
end

-- Check if a font exists
function surface.FontExists(name)
	return not not registered_fonts[name]
end