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