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import io
def decodepixmap(data):
f = io.BytesIO(data)
sig = f.readline().strip()
assert sig == b"P6"
while 1:
line = f.readline().strip()
if not line.startswith(b'#'):
break
wh = line.split()
w, h = list(map(int, wh))
sig = f.readline().strip()
assert sig == b"255"
data = f.read()
f.close()
return w, h, data
def encodepixmap(w, h, data):
return b'P6\n%d %d\n255\n%s' % (w, h, data)
def cropimage(xxx_todo_changeme, xxx_todo_changeme1):
(w, h, data) = xxx_todo_changeme
(x1, y1, w1, h1) = xxx_todo_changeme1
assert 0 <= x1 <= x1+w1 <= w
assert 0 <= y1 <= y1+h1 <= h
scanline = w*3
lines = [data[p:p+w1*3]
for p in range(y1*scanline + x1*3,
(y1+h1)*scanline + x1*3,
scanline)]
return w1, h1, b''.join(lines)
def vflip(w, h, data):
scanline = w*3
lines = [data[p:p+scanline] for p in range(0, len(data), scanline)]
lines.reverse()
return b''.join(lines)
def hflip(w, h, data):
scanline = w*3
lines = [b''.join([data[p:p+3] for p in range(p1+scanline-3, p1-3, -3)])
for p1 in range(0, len(data), scanline)]
return b''.join(lines)
def rotate_cw(w, h, data):
scanline = w*3
lastline = len(data) - scanline
lines = [b''.join([data[p:p+3] for p in range(lastline + p1, -1, -scanline)])
for p1 in range(0, scanline, 3)]
return b''.join(lines)
def rotate_ccw(w, h, data):
scanline = w*3
lines = [b''.join([data[p:p+3] for p in range(p1, len(data), scanline)])
for p1 in range(scanline-3, -3, -3)]
return b''.join(lines)
def rotate_180(w, h, data):
scanline = w*3
lines = [b''.join([data[p:p+3] for p in range(p1+scanline-3, p1-3, -3)])
for p1 in range(0, len(data), scanline)]
lines.reverse()
return b''.join(lines)
def makebkgnd(w, h, data):
scanline = 3*w
result = []
for position in range(0, scanline*h, scanline):
line = []
for p in range(position, position+scanline, 3):
line.append(2 * (chr(ord(data[p ]) >> 3) +
chr(ord(data[p+1]) >> 3) +
chr(ord(data[p+2]) >> 3)))
line = b''.join(line)
result.append(line)
result.append(line)
return w*2, h*2, b''.join(result)
translation_darker = (b'\x00\x01' + b'\x00'*126 +
b''.join([bytes([n//4]) for n in range(0,128)]))
translation_dragon = translation_darker[:255] + b'\xC0'
def make_dark(xxx_todo_changeme2, translation):
(w, h, data) = xxx_todo_changeme2
return w, h, data.translate(translation)
def col(xxx_todo_changeme3):
(r, g, b) = xxx_todo_changeme3
r = ord(r)
g = ord(g)
b = ord(b)
return ((g>>2 + r>>3) << 24) | (b << 16) | (g << 8) | r
def imagezoomer(w, h, data):
"Zoom a cartoon image by a factor of three, progressively."
scale = 3
scanline = 3*w
rw = (w-1)*scale+1
rh = (h-1)*scale+1
pixels = []
colcache = {}
revcache = {}
for base in range(0, scanline*h, scanline):
line = []
for x in range(w):
key = data[base + 3*x : base + 3*(x+1)]
try:
c = colcache[key]
except KeyError:
c = colcache[key] = col(key)
revcache[c] = key
line.append(c)
pixels.append(line)
yield None
Pairs = {
(0, 0): [(0, 0, 0, 0),
(-1,0, 1, 0),
(0,-1, 0, 1)],
(1, 0): [(0, 0, 1, 0),
(0, 1, 1,-1),
(0,-1, 1, 1)],
(2, 0): [(0, 0, 1, 0),
(0, 1, 1,-1),
(0,-1, 1, 1)],
(0, 1): [(0, 0, 0, 1),
(-1,0, 1, 1),
(1, 0,-1, 1)],
(1, 1): [(0, 0, 1, 1),
(0, 1, 1, -1),
(1, 0,-1, 1)],
(2, 1): [(1, 0, 0, 1),
(0,-1, 1, 1),
(0, 0, 2, 1)],
(0, 2): [(0, 0, 0, 1),
(-1,0, 1, 1),
(1, 0,-1, 1)],
(1, 2): [(0, 1, 1, 0),
(-1,0, 1, 1),
(0, 0, 1, 2)],
(2, 2): [(0, 0, 1, 1),
(0, 1, 2, 0),
(1, 0, 0, 2)],
}
result = []
for y in range(rh):
yield None
for x in range(rw):
# ______________________________
i = x//scale
j = y//scale
ps = []
for dx1, dy1, dx2, dy2 in Pairs[x%scale, y%scale]:
if (0 <= i+dx1 < w and 0 <= i+dx2 < w and
0 <= j+dy1 < h and 0 <= j+dy2 < h):
p1 = pixels[j+dy1][i+dx1]
p2 = pixels[j+dy2][i+dx2]
ps.append(max(p1, p2))
p1 = min(ps)
# ______________________________
result.append(revcache[p1])
data = b''.join(result)
yield (rw, rh, data)
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