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-----------------------------------------------------------------------
-- FILE: luaotfload-harf-var-t2-writer.lua
-- DESCRIPTION: part of luaotfload / HarfBuzz / Serialize Type 2 charstrings
-----------------------------------------------------------------------
do
assert(luaotfload_module, "This is a part of luaotfload and should not be loaded independently") {
name = "luaotfload-harf-var-t2-writer",
version = "3.20", --TAGVERSION
date = "2022-02-27", --TAGDATE
description = "luaotfload submodule / Type 2 charstring writer",
license = "GPL v2.0",
author = "Marcel Krüger",
copyright = "Luaotfload Development Team",
}
end
local pack = string.pack
local function numbertot2(n)
if math.abs(n) > 2^15 then
error[[Number too big]]
end
local num = math.floor(n + .5)
if n ~= 0 and math.abs((num-n)/n) > 0.001 then
num = math.floor(n * 2^16 + 0.5)
return pack(">Bi4", 255, math.floor(n * 2^16 + 0.5))
elseif num >= -107 and num <= 107 then
return string.char(num + 139)
elseif num >= 108 and num <= 1131 then
return pack(">I2", num+0xF694) -- -108+(247*0x100)
elseif num >= -1131 and num <= -108 then
return pack(">I2", -num+0xFA94) -- -108+(251*0x100)
else
return pack(">Bi2", 28, num)
end
end
local function convert_cs(cs, upem)
local cs_parts = {}
local function add(cmd, first, ...)
if cmd == 19 or cmd == 20 then
cs_parts[#cs_parts+1] = string.char(cmd)
cs_parts[#cs_parts+1] = first
return
end
if first then
cs_parts[#cs_parts+1] = numbertot2(first*upem/1000)
return add(cmd, ...)
end
if cmd then
if cmd < 0 then
cs_parts[#cs_parts+1] = string.char(12, -cmd-1)
else
cs_parts[#cs_parts+1] = string.char(cmd)
end
end
end
for _, args in ipairs(cs) do
if args then
local cmd = args[1]
local height = #args - 1
local i = 2
while height > 48 do
-- Special cases: hhcurveto, vvcurveto, rcurveline, rlinecurve
-- hhvurveto/vvcurveto: In odd argument case, the first argument must be
-- followed by a multiple of four arguments.
if cmd == 27 and i == 2 and height % 4 == 1 then -- hhcurveto
add(cmd, table.unpack(args, i, i + 44))
height = height - 45
i = i + 45
elseif cmd == 26 and i == 2 and height % 4 == 1 then -- vvcurveto
add(cmd, table.unpack(args, i, i + 44))
height = height - 45
i = i + 45
-- rcurveline/rlinecurve: At least 8 arguments must be preserved, all previous instances
-- need different commands
elseif cmd == 24 then -- rcurveline
height = height - 48
local count
if height >= 8 then
count = 48
else
count = 48 - 8 + height
height = 8
end
add(8, table.unpack(args, i, i + count - 1)) -- 8 = rrcurveto
i = i + count
elseif cmd == 25 then -- rlinecurve
height = height - 48
local count
if height >= 8 then
count = 48
else
count = 48 - 8 + height
height = 8
end
add(5, table.unpack(args, i, i + count - 1)) -- 5 = rlineto
i = i + count
else -- Some commands have an optional last argument which can appear after multiple of 48 arguments,
-- so it's safer to never leave a element alone in a line.
height = height - 48
local count
if height > 1 then
count = 48
else
-- assert(height == 1)
count = 24--48 - 25 + height
height = 25
end
add(cmd, table.unpack(args, i, i + count - 1))
i = i + count
end
end
add(cmd, table.unpack(args, i))
end
end
return table.concat(cs_parts)
end
return function(cs, upem)
return convert_cs(cs, upem or 1000)
end
|
