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local font = {}
signs.font_height = 10
-- Get png width, suposing png width is less than 256 (it is the case for all font textures)
local function get_png_width(filename)
local file=assert(io.open(filename,"rb"))
-- All font png are smaller than 256x256 --> read only last byte
file:seek("set",19)
local w = file:read(1)
file:close()
return w:byte()
end
-- Computes line width for a given font height and text
function signs.get_line_width(text)
local char
local width = 0
for p=1,#text
do
char = text:sub(p,p):byte()
if font[char] then
width = width + font[char].width
end
end
return width
end
--- Builds texture part for a text line
-- @param text Text to be rendered
-- @param x Starting x position in texture
-- @param width Width of the texture (extra text is not rendered)
-- @param y Vertical position of the line in texture
-- @return Texture string
function signs.make_line_texture(text, x, width, y)
local char
local texture = ""
for p=1,#text
do
char = text:sub(p,p):byte()
if font[char] then
-- Add image only if it is visible (at least partly)
if x + font[char].width >= 0 and x <= width then
texture = texture..string.format(":%d,%d=%s", x, y, font[char].filename)
end
x = x + font[char].width
end
end
return texture
end
-- Populate fonts table
local w, filename
for charnum=32,126 do
filename = string.format("signs_%02x.png", charnum)
w = get_png_width(signs.path.."/textures/"..filename)
font[charnum] = {filename=filename, width=w}
end
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