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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
|
#!/usr/bin/env python
'''
/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
'''
VOID, UNSIGNED, SIGNED, FIXED, FLOAT = range(5)
SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_W, SWIZZLE_0, SWIZZLE_1, SWIZZLE_NONE, = range(7)
PLAIN = 'plain'
RGB = 'rgb'
SRGB = 'srgb'
YUV = 'yuv'
ZS = 'zs'
def is_pot(x):
return (x & (x - 1)) == 0
VERY_LARGE = 99999999999999999999999
class Channel:
'''Describe the channel of a color channel.'''
def __init__(self, type, norm, pure, size, name = ''):
self.type = type
self.norm = norm
self.pure = pure
self.size = size
self.sign = type in (SIGNED, FIXED, FLOAT)
self.name = name
def __str__(self):
s = str(self.type)
if self.norm:
s += 'n'
if self.pure:
s += 'p'
s += str(self.size)
return s
def __eq__(self, other):
return self.type == other.type and self.norm == other.norm and self.pure == other.pure and self.size == other.size
def max(self):
'''Maximum representable number.'''
if self.type == FLOAT:
return VERY_LARGE
if self.type == FIXED:
return (1 << (self.size/2)) - 1
if self.norm:
return 1
if self.type == UNSIGNED:
return (1 << self.size) - 1
if self.type == SIGNED:
return (1 << (self.size - 1)) - 1
assert False
def min(self):
'''Minimum representable number.'''
if self.type == FLOAT:
return -VERY_LARGE
if self.type == FIXED:
return -(1 << (self.size/2))
if self.type == UNSIGNED:
return 0
if self.norm:
return -1
if self.type == SIGNED:
return -(1 << (self.size - 1))
assert False
class Format:
'''Describe a pixel format.'''
def __init__(self, name, layout, block_width, block_height, channels, swizzles, colorspace):
self.name = name
self.layout = layout
self.block_width = block_width
self.block_height = block_height
self.channels = channels
self.swizzles = swizzles
self.name = name
self.colorspace = colorspace
def __str__(self):
return self.name
def short_name(self):
'''Make up a short norm for a format, suitable to be used as suffix in
function names.'''
name = self.name
if name.startswith('PIPE_FORMAT_'):
name = name[len('PIPE_FORMAT_'):]
name = name.lower()
return name
def block_size(self):
size = 0
for channel in self.channels:
size += channel.size
return size
def nr_channels(self):
nr_channels = 0
for channel in self.channels:
if channel.size:
nr_channels += 1
return nr_channels
def is_array(self):
if self.layout != PLAIN:
return False
ref_channel = self.channels[0]
for channel in self.channels[1:]:
if channel.size and (channel.size != ref_channel.size or channel.size % 8):
return False
return True
def is_mixed(self):
if self.layout != PLAIN:
return False
ref_channel = self.channels[0]
if ref_channel.type == VOID:
ref_channel = self.channels[1]
for channel in self.channels[1:]:
if channel.type != VOID:
if channel.type != ref_channel.type:
return True
if channel.norm != ref_channel.norm:
return True
if channel.pure != ref_channel.pure:
return True
return False
def is_pot(self):
return is_pot(self.block_size())
def is_int(self):
if self.layout != PLAIN:
return False
for channel in self.channels:
if channel.type not in (VOID, UNSIGNED, SIGNED):
return False
return True
def is_float(self):
if self.layout != PLAIN:
return False
for channel in self.channels:
if channel.type not in (VOID, FLOAT):
return False
return True
def is_bitmask(self):
if self.layout != PLAIN:
return False
if self.block_size() not in (8, 16, 32):
return False
for channel in self.channels:
if channel.type not in (VOID, UNSIGNED, SIGNED):
return False
return True
def inv_swizzles(self):
'''Return an array[4] of inverse swizzle terms'''
inv_swizzle = [None]*4
for i in range(4):
swizzle = self.swizzles[i]
if swizzle < 4:
inv_swizzle[swizzle] = i
return inv_swizzle
def stride(self):
return self.block_size()/8
_type_parse_map = {
'': VOID,
'x': VOID,
'u': UNSIGNED,
's': SIGNED,
'h': FIXED,
'f': FLOAT,
}
_swizzle_parse_map = {
'x': SWIZZLE_X,
'y': SWIZZLE_Y,
'z': SWIZZLE_Z,
'w': SWIZZLE_W,
'0': SWIZZLE_0,
'1': SWIZZLE_1,
'_': SWIZZLE_NONE,
}
def parse(filename):
'''Parse the format descrition in CSV format in terms of the
Channel and Format classes above.'''
stream = open(filename)
formats = []
for line in stream:
try:
comment = line.index('#')
except ValueError:
pass
else:
line = line[:comment]
line = line.strip()
if not line:
continue
fields = [field.strip() for field in line.split(',')]
name = fields[0]
layout = fields[1]
block_width, block_height = map(int, fields[2:4])
swizzles = [_swizzle_parse_map[swizzle] for swizzle in fields[8]]
colorspace = fields[9]
if layout == PLAIN:
names = ['']*4
if colorspace in (RGB, SRGB):
for i in range(4):
swizzle = swizzles[i]
if swizzle < 4:
names[swizzle] += 'rgba'[i]
elif colorspace == ZS:
for i in range(4):
swizzle = swizzles[i]
if swizzle < 4:
names[swizzle] += 'zs'[i]
else:
assert False
for i in range(4):
if names[i] == '':
names[i] = 'x'
else:
names = ['x', 'y', 'z', 'w']
channels = []
for i in range(0, 4):
field = fields[4 + i]
if field:
type = _type_parse_map[field[0]]
if field[1] == 'n':
norm = True
pure = False
size = int(field[2:])
elif field[1] == 'p':
pure = True
norm = False
size = int(field[2:])
else:
norm = False
pure = False
size = int(field[1:])
else:
type = VOID
norm = False
pure = False
size = 0
channel = Channel(type, norm, pure, size, names[i])
channels.append(channel)
format = Format(name, layout, block_width, block_height, channels, swizzles, colorspace)
formats.append(format)
return formats
|
