modlib/minetest/texmod/calc_dims.lua

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local cd = {}
local function calc_dims(self, get_file_dims)
return assert(cd[self.type])(self, get_file_dims)
end
function cd:file(d)
return d(self.filename)
end
do
local function base_dim(self, get_dims) return calc_dims(self.base, get_dims) end
cd.opacity = base_dim
cd.invert = base_dim
cd.brighten = base_dim
cd.noalpha = base_dim
cd.makealpha = base_dim
cd.lowpart = base_dim
cd.mask = base_dim
cd.multiply = base_dim
cd.colorize = base_dim
cd.colorizehsl = base_dim
cd.hsl = base_dim
cd.screen = base_dim
cd.contrast = base_dim
end
do
local function wh(self) return self.w, self.h end
cd.resize = wh
cd.combine = wh
end
function cd:fill(get_dims)
if self.base then return calc_dims(self.base, get_dims) end
return self.w, self.h
end
do
local function upscale_to_higher_res(self, get_dims)
local base_w, base_h = calc_dims(self.base, get_dims)
local over_w, over_h = calc_dims(self.over, get_dims)
if base_w * base_h > over_w * over_h then
return base_w, base_h
end
return over_w, over_h
end
cd.blit = upscale_to_higher_res
cd.overlay = upscale_to_higher_res
cd.hardlight = upscale_to_higher_res
end
function cd:transform(get_dims)
if self.rotation_deg % 180 ~= 0 then
local base_w, base_h = calc_dims(self.base, get_dims)
return base_h, base_w
end
return calc_dims(self.base, get_dims)
end
do
local math_clamp = modlib.math.clamp
local function next_pow_of_2(x)
-- I don't want to use a naive 2^ceil(log(x)/log(2)) due to possible float precision issues.
local m, e = math.frexp(x) -- x = _*2^e, _ in [0.5, 1)
if m == 0.5 then e = e - 1 end -- x = 2^(e-1)
return math.ldexp(1, e) -- 2^e, premature optimization here we go
end
function cd:inventorycube(get_dims)
local top_w, top_h = calc_dims(self.top, get_dims)
local left_w, left_h = calc_dims(self.left, get_dims)
local right_w, right_h = calc_dims(self.right, get_dims)
local d = math_clamp(next_pow_of_2(math.max(top_w, top_h, left_w, left_h, right_w, right_h)), 2, 64)
return d, d
end
end
do
local function frame_dims(self, get_dims)
local base_w, base_h = calc_dims(self.base, get_dims)
return base_w, math.floor(base_h / self.framecount)
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end
cd.verticalframe = frame_dims
cd.crack = frame_dims
cd.cracko = frame_dims
end
function cd:sheet(get_dims)
local base_w, base_h = calc_dims(self.base, get_dims)
return math.floor(base_w / self.w), math.floor(base_h / self.h)
end
function cd:png()
local png = modlib.minetest.decode_png(modlib.text.inputstream(self.data))
return png.width, png.height
end
return calc_dims