1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
import imageop
error = 'imgconv.error'
LOSSY = 1
NOT_LOSSY = 0
def null(img, x, y):
return img
def mono2grey(img, x, y):
return imageop.mono2grey(img, x, y, 0, 255)
def grey2jpeggrey(img, x, y):
import jpeg
return jpeg.compress(img, x, y, 1)
def rgb2jpeg(img, x, y):
import jpeg
return jpeg.compress(img, x, y, 4)
def jpeggrey2grey(img, width, height):
import jpeg
data, width, height, bytesperpixel = jpeg.decompress(img)
if bytesperpixel <> 1: raise RuntimeError, 'not greyscale jpeg'
return data
def jpeg2rgb(img, width, height):
import cl, CL
import jpeg
data, width, height, bytesperpixel = jpeg.decompress(img)
if bytesperpixel <> 4: raise RuntimeError, 'not rgb jpeg'
return data
converters = [ \
('grey', 'grey4', imageop.grey2grey4, LOSSY), \
('grey', 'grey2', imageop.dither2grey2, LOSSY), \
('grey', 'mono', imageop.dither2mono, LOSSY), \
('mono', 'grey', mono2grey, NOT_LOSSY), \
('grey2', 'grey', imageop.grey22grey, NOT_LOSSY), \
('grey4', 'grey', imageop.grey42grey, NOT_LOSSY), \
('rgb', 'rgb8', imageop.rgb2rgb8, LOSSY), \
('rgb8', 'rgb', imageop.rgb82rgb, NOT_LOSSY), \
('rgb', 'grey', imageop.rgb2grey, LOSSY), \
('grey', 'rgb', imageop.grey2rgb, NOT_LOSSY), \
('jpeggrey','grey',jpeggrey2grey, NOT_LOSSY), \
('grey', 'jpeggrey',grey2jpeggrey, LOSSY), \
('jpeg', 'rgb', jpeg2rgb, NOT_LOSSY), \
('rgb', 'jpeg', rgb2jpeg, LOSSY), \
]
built = {}
def addconverter(fcs, tcs, lossy, func):
for i in range(len(converters)):
ifcs, itcs, irtn, ilossy = converters[i]
if (fcs, tcs) == (ifcs, itcs):
converters[i] = (fcs, tcs, func, lossy)
return
converters.append((fcs,tcs,lossy,func))
def getconverter(fcs, tcs):
#
# If formats are the same return the dummy converter
#
if fcs == tcs: return null
#
# Otherwise, if we have a converter return that one
#
for ifcs, itcs, irtn, ilossy in converters:
if (fcs, tcs) == (ifcs, itcs):
return irtn
#
# Finally, we try to create a converter
#
if not built.has_key(fcs):
built[fcs] = enumerate_converters(fcs)
if not built[fcs].has_key(tcs):
raise error, 'Sorry, conversion from '+fcs+' to '+tcs+ \
' is not implemented'
if len(built[fcs][tcs]) == 3:
#
# Converter not instantiated yet
#
built[fcs][tcs].append(instantiate_converter(built[fcs][tcs]))
cf = built[fcs][tcs][3]
return cf
def enumerate_converters(fcs):
cvs = {}
formats = [fcs]
steps = 0
while 1:
workdone = 0
for ifcs, itcs, irtn, ilossy in converters:
if ifcs == fcs:
template = [ilossy, 1, [irtn]]
elif cvs.has_key(ifcs):
template = cvs[ifcs][:]
template[2] = template[2][:]
if ilossy:
template[0] = ilossy
template[1] = template[1] + 1
template[2].append(irtn)
else:
continue
if not cvs.has_key(itcs):
cvs[itcs] = template
workdone = 1
else:
previous = cvs[itcs]
if template < previous:
cvs[itcs] = template
workdone = 1
if not workdone:
break
steps = steps + 1
if steps > len(converters):
print '------------------loop in emunerate_converters--------'
print 'CONVERTERS:'
print converters
print 'RESULTS:'
print cvs
raise error, 'Internal error - loop'
return cvs
def instantiate_converter(args):
list = args[2]
cl = RtConverters().init(list)
args.append(cl.convert)
return args
class RtConverters:
def init(self, list):
self.list = list
return self
def convert(self, img, w, h):
for cv in self.list:
img = cv(img, w, h)
return img
|
