EinsDreiDreiSieben/mods/futil/minetest/image.lua

local f = string.format

local function is_vertical_frames(animation)
	return (animation.type == "vertical_frames" and animation.aspect_w and animation.aspect_h)
end

local function get_single_frame(animation, image_name)
	return ("[combine:%ix%i^[noalpha^[colorize:#FFF:255^[mask:%s"):format(
		animation.aspect_w,
		animation.aspect_h,
		image_name
	)
end

local function is_sheet_2d(animation)
	return (animation.type == "sheet_2d" and animation.frames_w and animation.frames_h)
end

local function get_sheet_2d(animation, image_name)
	return ("%s^[sheet:%ix%i:0,0"):format(image_name, animation.frames_w, animation.frames_h)
end

local get_image_from_tile = futil.memoize1(function(tile)
	if type(tile) == "string" then
		return tile
	elseif type(tile) == "table" then
		local image_name

		if type(tile.image) == "string" then
			image_name = tile.image
		elseif type(tile.name) == "string" then
			image_name = tile.name
		end

		if image_name then
			local animation = tile.animation
			if animation then
				if is_vertical_frames(animation) then
					return get_single_frame(animation, image_name)
				elseif is_sheet_2d(animation) then
					return get_sheet_2d(animation, image_name)
				end
			end

			return image_name
		end
	end

	return "unknown_node.png"
end)

local function get_image_cube(tiles)
	if #tiles >= 6 then
		return minetest.inventorycube(
			get_image_from_tile(tiles[1] or "no_texture.png"),
			get_image_from_tile(tiles[6] or "no_texture.png"),
			get_image_from_tile(tiles[3] or "no_texture.png")
		)
	elseif #tiles == 5 then
		return minetest.inventorycube(
			get_image_from_tile(tiles[1] or "no_texture.png"),
			get_image_from_tile(tiles[5] or "no_texture.png"),
			get_image_from_tile(tiles[3] or "no_texture.png")
		)
	elseif #tiles == 4 then
		return minetest.inventorycube(
			get_image_from_tile(tiles[1] or "no_texture.png"),
			get_image_from_tile(tiles[4] or "no_texture.png"),
			get_image_from_tile(tiles[3] or "no_texture.png")
		)
	elseif #tiles == 3 then
		return minetest.inventorycube(
			get_image_from_tile(tiles[1] or "no_texture.png"),
			get_image_from_tile(tiles[3] or "no_texture.png"),
			get_image_from_tile(tiles[3] or "no_texture.png")
		)
	elseif #tiles == 2 then
		return minetest.inventorycube(
			get_image_from_tile(tiles[1] or "no_texture.png"),
			get_image_from_tile(tiles[2] or "no_texture.png"),
			get_image_from_tile(tiles[2] or "no_texture.png")
		)
	elseif #tiles == 1 then
		return minetest.inventorycube(
			get_image_from_tile(tiles[1] or "no_texture.png"),
			get_image_from_tile(tiles[1] or "no_texture.png"),
			get_image_from_tile(tiles[1] or "no_texture.png")
		)
	end

	return "no_texture.png"
end

local function is_normal_node(drawtype)
	return (
		drawtype == "normal"
		or drawtype == "allfaces"
		or drawtype == "allfaces_optional"
		or drawtype == "glasslike"
		or drawtype == "glasslike_framed"
		or drawtype == "glasslike_framed_optional"
		or drawtype == "liquid"
	)
end

local cache = {}

function futil.get_wield_image(item)
	if type(item) == "string" then
		item = ItemStack(item)
	end

	if item:is_empty() then
		return "blank.png"
	end

	local def = item:get_definition()
	if not def then
		return "unknown_item.png"
	end

	local itemstring = item:to_string()
	local cached = cache[itemstring]
	if cached then
		return cached
	end

	local meta = item:get_meta()
	local color = meta:get("color") or def.color

	local image = "no_texture.png"

	if def.wield_image and def.wield_image ~= "" then
		local parts = { def.wield_image }
		if color then
			parts[#parts + 1] = f("[colorize:%s:alpha", futil.escape_texture(color))
		end
		if def.wield_overlay then
			parts[#parts + 1] = def.wield_overlay
		end
		image = table.concat(parts, "^")
	elseif def.inventory_image and def.inventory_image ~= "" then
		local parts = { def.inventory_image }
		if color then
			parts[#parts + 1] = f("[colorize:%s:alpha", futil.escape_texture(color))
		end
		if def.inventory_overlay then
			parts[#parts + 1] = def.inventory_overlay
		end
		image = table.concat(parts, "^")
	elseif def.type == "node" then
		if def.drawtype == "nodebox" or def.drawtype == "mesh" then
			image = "no_texture.png"
		else
			local tiles = def.tiles
			if type(tiles) == "string" then
				image = get_image_from_tile(tiles)
			elseif type(tiles) == "table" then
				if is_normal_node(def.drawtype) then
					image = get_image_cube(tiles)
				else
					image = get_image_from_tile(tiles[1])
				end
			end
		end
	end

	cache[itemstring] = image

	return image
end