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local fb = {}
fb.w = 0
fb.h = 0
fb.x = 0
fb.y = 0
fb.buf = nil
function fb.init(w, h)
fb.w = w
fb.h = h
fb.x = 0
fb.y = 0
fb.buf = {}
end
function fb.scroll()
for x = 0, fb.w-1 do
for y = 1, fb.h/8-1 do
fb.buf[x*(fb.h/8) + y-1 + 1] = fb.buf[x*(fb.h/8) + y + 1] or nil
end
fb.buf[x*(fb.h/8) + fb.h/8] = nil
end
fb.y = fb.y - 8
end
function fb.put(font, c)
if c == 10 then
fb.x = 0
fb.y = fb.y + font.height
return
end
if c < 32 or c > 126 then
c = 0x3f
end
if fb.y >= fb.h then
fb.scroll()
end
local glyph = font.glyphs[c - 31]
local fh = font.height/8
for i = 1, string.len(glyph) do
local x1 = (i-1) / fh
local y8 = (i-1) % fh
fb.buf[fb.y/8+y8 + (fb.x+x1) * (fb.h/8) + 1] = string.byte(glyph, i)
end
fb.x = fb.x + string.len(glyph) / fh + 2
if fb.x > fb.w then
fb.put(font, 10)
end
end
function fb.print(font, str)
for i = 1, string.len(str) do
fb.put(font, string.byte(str, i))
end
end
return fb
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