def err(i):
"error function"
f = 1 / (1. + quality * 254)
t = rgba(i)
c2 = (int(int(t[0] * f) / f), int(int(t[1] * f) / f),
int(int(t[2] * f) / f), t[3])
return reduce(c2)
def err(i) :
"error function"
f = 1/(1.+quality*254)
t=rgba(i)
c2=(int(int(t[0]*f)/f),int(int(t[1]*f)/f),int(int(t[2]*f)/f),t[3])
return reduce(c2)
def image_encode(src,f,frame_height, quality) :
def err(i) :
"error function"
f = 1/(1.+quality*254)
t=rgba(i)
c2=(int(int(t[0]*f)/f),int(int(t[1]*f)/f),int(int(t[2]*f)/f),t[3])
return reduce(c2)
data = [reduce(c) for c in src.getdata()] # keep image in RAM as RGBA tuples.
w,h=src.size
s_blits = [] # stringified blits for all image
start_file = f.tell()
line16=[] # offsets from start as u16 index on words
for y in range(h) :
if y%16==0 :
ofs = sum(len(x) for x in s_blits)
line16.append(ofs/4) # XXX use /4 but need to align
skipped=0
blits=[]
line=data[y*w:(y+1)*w] # 16 bit data
singles=[]
for c,g in groupby(line, key=err) :
t = tuple(g)
n = len(t)
# take the most frequent reral color
cnt = Counter(t)
col = cnt.most_common(1)[0][0]
blits.append([n,col,False])
# set EOL
if blits :
blits[-1][2]=True
else :
blits.append([0,[],True])
# now encode line : (header + blit) x n
for num, color, eol in blits :
header=(num<<3) | (1 if eol else 0)
s = struct.pack('<HH', header, color)
s_blits.append(s)
# save header
add_record(f,'header',struct.pack("<2I",w,frame_height)) # 1 frame for now
# write data
add_record(f,'rle',''.join(s_blits))
# line16 record
add_record(f,'line16',struct.pack("%dH"%len(line16),*line16))
# finish file
add_record(f,'end','')
size=f.tell()
print '// %d bytes (%d/1M), reduction by %.1f'%(size,1024*1024/size,2*float(w)*h/size)
def image_encode(src, f, frame_height, quality):
def err(i):
"error function"
f = 1 / (1. + quality * 254)
t = rgba(i)
c2 = (int(int(t[0] * f) / f), int(int(t[1] * f) / f),
int(int(t[2] * f) / f), t[3])
return reduce(c2)
data = [reduce(c)
for c in src.getdata()] # keep image in RAM as RGBA tuples.
w, h = src.size
s_blits = [] # stringified blits for all image
start_file = f.tell()
line16 = [] # offsets from start as u16 index on words
for y in range(h):
if y % 16 == 0:
ofs = sum(len(x) for x in s_blits)
line16.append(ofs / 4) # XXX use /4 but need to align
skipped = 0
blits = []
line = data[y * w:(y + 1) * w] # 16 bit data
singles = []
for c, g in groupby(line, key=err):
t = tuple(g)
n = len(t)
# take the most frequent reral color
cnt = Counter(t)
col = cnt.most_common(1)[0][0]
blits.append([n, col, False])
# set EOL
if blits:
blits[-1][2] = True
else:
blits.append([0, [], True])
# now encode line : (header + blit) x n
for num, color, eol in blits:
header = (num << 3) | (1 if eol else 0)
s = struct.pack('<HH', header, color)
s_blits.append(s)
# save header
add_record(f, 'header', struct.pack("<2I", w,
frame_height)) # 1 frame for now
# write data
add_record(f, 'rle', ''.join(s_blits))
# line16 record
add_record(f, 'line16', struct.pack("%dH" % len(line16), *line16))
# finish file
add_record(f, 'end', '')
size = f.tell()
print '// %d bytes (%d/1M), reduction by %.1f' % (size, 1024 * 1024 / size,
2 * float(w) * h / size)
