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#!/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, size, name = ''):
self.type = type
self.norm = norm
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'
s += str(self.size)
return s
def __eq__(self, other):
return self.type == other.type and self.norm == other.norm 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
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
size = int(field[2:])
else:
norm = False
size = int(field[1:])
else:
type = VOID
norm = False
size = 0
channel = Channel(type, norm, size, names[i])
channels.append(channel)
format = Format(name, layout, block_width, block_height, channels, swizzles, colorspace)
formats.append(format)
return formats
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