Use PNG instead of TGA
Elias Fleckenstein
parent
d9a670dcb8
commit
ca9cd8cbe0
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@ -1,4 +0,0 @@
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# tga_encoder
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A TGA Encoder written in Lua without the use of external Libraries.
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May be used as a Minetest mod.
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@ -1,109 +0,0 @@
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tga_encoder = {}
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local LUA_ARGS_LIMIT = 1000
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local image = setmetatable({}, {
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__call = function(self, ...)
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local t = setmetatable({}, {__index = self})
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t:constructor(...)
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return t
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end,
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})
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function image:constructor(pixels)
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self.bytes = {}
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self.chunks = {self.bytes}
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self.pixels = pixels
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self.width = #pixels[1]
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self.height = #pixels
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self:encode()
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end
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function image:insert(byte)
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table.insert(self.bytes, byte)
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if #self.bytes == LUA_ARGS_LIMIT then
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self.bytes = {}
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table.insert(self.chunks, self.bytes)
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end
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end
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function image:littleendian(size, value)
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for i = 1, size do
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local byte = value % 256
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value = value - byte
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value = value / 256
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self:insert(byte)
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end
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end
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function image:encode_colormap_spec()
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-- first entry index
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self:littleendian(2, 0)
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-- number of entries
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self:littleendian(2, 0)
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-- number of bits per pixel
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self:insert(0)
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end
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function image:encode_image_spec()
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-- X- and Y- origin
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self:littleendian(2, 0)
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self:littleendian(2, 0)
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-- width and height
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self:littleendian(2, self.width)
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self:littleendian(2, self.height)
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-- pixel depth
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self:insert(24)
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-- image descriptor
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self:insert(0)
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end
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function image:encode_header()
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-- id length
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self:insert(0) -- no image id info
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-- color map type
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self:insert(0) -- no color map
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-- image type
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self:insert(2) -- uncompressed true-color image
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-- color map specification
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self:encode_colormap_spec()
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-- image specification
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self:encode_image_spec()
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end
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function image:encode_data()
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for _, row in ipairs(self.pixels) do
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for _, pixel in ipairs(row) do
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self:insert(pixel[3])
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self:insert(pixel[2])
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self:insert(pixel[1])
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end
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end
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end
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function image:encode()
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-- encode header
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self:encode_header()
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-- no color map and image id data
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-- encode data
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self:encode_data()
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-- no extension area
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end
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function image:get_data()
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local data = ""
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for _, bytes in ipairs(self.chunks) do
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data = data .. string.char(unpack(bytes))
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end
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return data .. string.char(0, 0, 0, 0) .. string.char(0, 0, 0, 0) .. "TRUEVISION-XFILE." .. string.char(0)
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end
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function image:save(filename)
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self.data = self.data or self:get_data()
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local f = assert(io.open(filename, "w"))
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f:write(self.data)
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f:close()
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end
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tga_encoder.image = image
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@ -1,3 +0,0 @@
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name = tga_encoder
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author = Fleckenstein
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description = A TGA Encoder written in Lua without the use of external Libraries.
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@ -0,0 +1,98 @@
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bit32 = {}
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local N = 32
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local P = 2^N
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function bit32.bnot(x)
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x = x % P
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return P - 1 - x
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end
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function bit32.band(x, y)
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-- Common usecases, they deserve to be optimized
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if y == 0xff then return x % 0x100 end
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if y == 0xffff then return x % 0x10000 end
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if y == 0xffffffff then return x % 0x100000000 end
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x, y = x % P, y % P
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local r = 0
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local p = 1
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for i = 1, N do
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local a, b = x % 2, y % 2
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x, y = math.floor(x / 2), math.floor(y / 2)
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if a + b == 2 then
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r = r + p
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end
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p = 2 * p
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end
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return r
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end
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function bit32.bor(x, y)
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-- Common usecases, they deserve to be optimized
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if y == 0xff then return x - (x%0x100) + 0xff end
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if y == 0xffff then return x - (x%0x10000) + 0xffff end
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if y == 0xffffffff then return 0xffffffff end
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x, y = x % P, y % P
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local r = 0
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local p = 1
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for i = 1, N do
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local a, b = x % 2, y % 2
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x, y = math.floor(x / 2), math.floor(y / 2)
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if a + b >= 1 then
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r = r + p
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end
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p = 2 * p
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end
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return r
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end
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function bit32.bxor(x, y)
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x, y = x % P, y % P
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local r = 0
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local p = 1
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for i = 1, N do
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local a, b = x%2, y%2
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x, y = math.floor(x/2), math.floor(y/2)
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if a + b == 1 then
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r = r + p
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end
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p = 2 * p
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end
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return r
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end
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function bit32.lshift(x, s_amount)
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if math.abs(s_amount) >= N then return 0 end
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x = x % P
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if s_amount < 0 then
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return math.floor(x * (2 ^ s_amount))
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else
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return (x * (2 ^ s_amount)) % P
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end
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end
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function bit32.rshift(x, s_amount)
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if math.abs(s_amount) >= N then return 0 end
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x = x % P
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if s_amount > 0 then
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return math.floor(x * (2 ^ - s_amount))
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else
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return (x * (2 ^ -s_amount)) % P
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end
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end
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function bit32.arshift(x, s_amount)
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if math.abs(s_amount) >= N then return 0 end
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x = x % P
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if s_amount > 0 then
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local add = 0
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if x >= P/2 then
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add = P - 2 ^ (N - s_amount)
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end
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return math.floor(x * (2 ^ -s_amount)) + add
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else
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return (x * (2 ^ -s_amount)) % P
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end
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end
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@ -7,6 +7,11 @@ local worldpath = minetest.get_worldpath()
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local map_textures_path = worldpath .. "/mcl_maps/"
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local last_finished_id = storage:get_int("next_id") - 1
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dofile(modpath .. "/bit32.lua") -- taken from http://gitea.minetest.one/minetest-mods/turtle/src/branch/master/bit32.lua
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bit = bit32
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pngencoder = dofile(modpath .. "/pngencoder.lua") -- taken from https://github.com/wyozi/lua-pngencoder/blob/master/pngencoder.lua
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minetest.mkdir(map_textures_path)
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local function load_json_file(name)
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@ -32,7 +37,7 @@ function mcl_maps.create_map(pos)
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local meta = itemstack:get_meta()
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local id = storage:get_int("next_id")
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storage:set_int("next_id", id + 1)
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local texture_file = "mcl_maps_map_texture_" .. id .. ".tga"
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local texture_file = "mcl_maps_map_texture_" .. id .. ".png"
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local texture_path = map_textures_path .. texture_file
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local texture = "[combine:140x140:0,0=mcl_maps_map_background.png:6,6=" .. texture_file
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meta:set_int("mcl_maps:id", id)
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@ -121,7 +126,16 @@ function mcl_maps.create_map(pos)
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end
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last_heightmap = heightmap
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end
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tga_encoder.image(pixels):save(texture_path)
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local image = pngencoder(128, 128, "rgb")
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for _, row in ipairs(pixels) do
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for _, pixel in ipairs(row) do
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image:write(pixel)
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end
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end
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assert(image.done)
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local f = assert(io.open(texture_path, "w"))
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f:write(table.concat(image.output))
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f:close()
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creating_maps[texture] = false
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end)
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return itemstack
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@ -1,2 +1,2 @@
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name = mcl_maps
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depends = mcl_core, mcl_flowers, tga_encoder, tt, mcl_colors
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depends = mcl_core, mcl_flowers, tt, mcl_colors
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@ -0,0 +1,190 @@
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local Png = {}
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Png.__index = Png
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local DEFLATE_MAX_BLOCK_SIZE = 65535
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local function putBigUint32(val, tbl, index)
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for i=0,3 do
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tbl[index + i] = bit.band(bit.rshift(val, (3 - i) * 8), 0xFF)
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end
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end
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function Png:writeBytes(data, index, len)
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index = index or 1
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len = len or #data
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for i=index,index+len-1 do
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table.insert(self.output, string.char(data[i]))
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end
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end
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function Png:write(pixels)
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local count = #pixels -- Byte count
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local pixelPointer = 1
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while count > 0 do
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if self.positionY >= self.height then
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error("All image pixels already written")
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end
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if self.deflateFilled == 0 then -- Start DEFLATE block
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local size = DEFLATE_MAX_BLOCK_SIZE;
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if (self.uncompRemain < size) then
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size = self.uncompRemain
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end
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local header = { -- 5 bytes long
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bit.band((self.uncompRemain <= DEFLATE_MAX_BLOCK_SIZE and 1 or 0), 0xFF),
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bit.band(bit.rshift(size, 0), 0xFF),
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bit.band(bit.rshift(size, 8), 0xFF),
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bit.band(bit.bxor(bit.rshift(size, 0), 0xFF), 0xFF),
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bit.band(bit.bxor(bit.rshift(size, 8), 0xFF), 0xFF),
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}
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self:writeBytes(header)
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self:crc32(header, 1, #header)
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end
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assert(self.positionX < self.lineSize and self.deflateFilled < DEFLATE_MAX_BLOCK_SIZE);
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if (self.positionX == 0) then -- Beginning of line - write filter method byte
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local b = {0}
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self:writeBytes(b)
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self:crc32(b, 1, 1)
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self:adler32(b, 1, 1)
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self.positionX = self.positionX + 1
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self.uncompRemain = self.uncompRemain - 1
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self.deflateFilled = self.deflateFilled + 1
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else -- Write some pixel bytes for current line
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local n = DEFLATE_MAX_BLOCK_SIZE - self.deflateFilled;
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if (self.lineSize - self.positionX < n) then
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n = self.lineSize - self.positionX
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end
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if (count < n) then
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n = count;
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end
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assert(n > 0);
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self:writeBytes(pixels, pixelPointer, n)
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-- Update checksums
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self:crc32(pixels, pixelPointer, n);
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self:adler32(pixels, pixelPointer, n);
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-- Increment positions
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count = count - n;
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pixelPointer = pixelPointer + n;
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self.positionX = self.positionX + n;
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self.uncompRemain = self.uncompRemain - n;
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self.deflateFilled = self.deflateFilled + n;
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end
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if (self.deflateFilled >= DEFLATE_MAX_BLOCK_SIZE) then
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self.deflateFilled = 0; -- End current block
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end
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if (self.positionX == self.lineSize) then -- Increment line
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self.positionX = 0;
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self.positionY = self.positionY + 1;
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if (self.positionY == self.height) then -- Reached end of pixels
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local footer = { -- 20 bytes long
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0, 0, 0, 0, -- DEFLATE Adler-32 placeholder
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0, 0, 0, 0, -- IDAT CRC-32 placeholder
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-- IEND chunk
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0x00, 0x00, 0x00, 0x00,
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0x49, 0x45, 0x4E, 0x44,
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0xAE, 0x42, 0x60, 0x82,
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}
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putBigUint32(self.adler, footer, 1)
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self:crc32(footer, 1, 4)
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putBigUint32(self.crc, footer, 5)
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self:writeBytes(footer)
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self.done = true
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end
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end
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end
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end
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function Png:crc32(data, index, len)
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self.crc = bit.bnot(self.crc)
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for i=index,index+len-1 do
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local byte = data[i]
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for j=0,7 do -- Inefficient bitwise implementation, instead of table-based
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local nbit = bit.band(bit.bxor(self.crc, bit.rshift(byte, j)), 1);
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self.crc = bit.bxor(bit.rshift(self.crc, 1), bit.band((-nbit), 0xEDB88320));
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end
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end
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self.crc = bit.bnot(self.crc)
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end
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function Png:adler32(data, index, len)
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local s1 = bit.band(self.adler, 0xFFFF)
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local s2 = bit.rshift(self.adler, 16)
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for i=index,index+len-1 do
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s1 = (s1 + data[i]) % 65521
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s2 = (s2 + s1) % 65521
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end
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self.adler = bit.bor(bit.lshift(s2, 16), s1)
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end
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local function begin(width, height, colorMode)
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-- Default to rgb
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colorMode = colorMode or "rgb"
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-- Determine bytes per pixel and the PNG internal color type
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local bytesPerPixel, colorType
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if colorMode == "rgb" then
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bytesPerPixel, colorType = 3, 2
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elseif colorMode == "rgba" then
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bytesPerPixel, colorType = 4, 6
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else
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error("Invalid colorMode")
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end
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local state = setmetatable({ width = width, height = height, done = false, output = {} }, Png)
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-- Compute and check data siezs
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state.lineSize = width * bytesPerPixel + 1
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-- TODO: check if lineSize too big
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state.uncompRemain = state.lineSize * height
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local numBlocks = math.ceil(state.uncompRemain / DEFLATE_MAX_BLOCK_SIZE)
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-- 5 bytes per DEFLATE uncompressed block header, 2 bytes for zlib header, 4 bytes for zlib Adler-32 footer
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local idatSize = numBlocks * 5 + 6
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idatSize = idatSize + state.uncompRemain;
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-- TODO check if idatSize too big
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local header = { -- 43 bytes long
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-- PNG header
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0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A,
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-- IHDR chunk
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0x00, 0x00, 0x00, 0x0D,
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0x49, 0x48, 0x44, 0x52,
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0, 0, 0, 0, -- 'width' placeholder
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0, 0, 0, 0, -- 'height' placeholder
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0x08, colorType, 0x00, 0x00, 0x00,
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0, 0, 0, 0, -- IHDR CRC-32 placeholder
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-- IDAT chunk
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0, 0, 0, 0, -- 'idatSize' placeholder
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0x49, 0x44, 0x41, 0x54,
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-- DEFLATE data
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0x08, 0x1D,
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}
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putBigUint32(width, header, 17)
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putBigUint32(height, header, 21)
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putBigUint32(idatSize, header, 34)
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state.crc = 0
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state:crc32(header, 13, 17)
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putBigUint32(state.crc, header, 30)
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state:writeBytes(header)
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state.crc = 0
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state:crc32(header, 38, 6); -- 0xD7245B6B
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state.adler = 1
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state.positionX = 0
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state.positionY = 0
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state.deflateFilled = 0
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return state
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end
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return begin
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