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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/32 do
fb.buf[x*(fb.h/32) + y-1 + 1] = bit.rshift(fb.buf[x*(fb.h/32) + y-1 + 1] or 0, 8) or nil
if y ~= fb.h/32 then
fb.buf[x*(fb.h/32) + y-1 + 1] = bit.bor(fb.buf[x*(fb.h/32) + y-1 + 1] or 0, bit.lshift(fb.buf[x*(fb.h/32) + y + 1] or 0, 24)) or nil
end
end
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
local fb8_o = fb.y/8+y8 + (fb.x+x1) * (fb.h/8)
local fb32_o = fb8_o / 4 + 1
local fb32_s = (fb8_o % 4) * 8
fb.buf[fb32_o] = bit.bor(fb.buf[fb32_o] or 0, bit.lshift(string.byte(glyph, i), fb32_s))
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
function fb.draw_battery_8(x, y, p)
fb.buf[y/32 + x*fb.h/32 + 1] = 0xff
for i = 1, 10 do
if p*2 >= i*15 then
fb.buf[y/32 + (x+i)*fb.h/32 + 1] = 0xff
else
fb.buf[y/32 + (x+i)*fb.h/32 + 1] = 0x81
end
end
if p*2 >= 11*15 then
fb.buf[y/32 + (x+11)*fb.h/32 + 1] = 0xff
else
fb.buf[y/32 + (x+11)*fb.h/32 + 1] = 0xe7
end
if p*2 >= 12*15 then
fb.buf[y/32 + (x+12)*fb.h/32 + 1] = 0x3c
else
fb.buf[y/32 + (x+12)*fb.h/32 + 1] = 0x24
end
fb.buf[y/32 + (x+13)*fb.h/32 + 1] = 0x3c
end
return fb
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