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GimpGradientFile.pyo
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Python Compiled Bytecode
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2008-10-13
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3KB
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98 lines
# Source Generated with Decompyle++
# File: in.pyo (Python 2.5)
from math import pi, log, sin, sqrt
import string
EPSILON = 1e-10
def linear(middle, pos):
if pos <= middle:
if middle < EPSILON:
return 0
else:
return 0.5 * pos / middle
else:
pos = pos - middle
middle = 1 - middle
if middle < EPSILON:
return 1
else:
return 0.5 + 0.5 * pos / middle
def curved(middle, pos):
return pos ** (log(0.5) / log(max(middle, EPSILON)))
def sine(middle, pos):
return (sin(-pi / 2 + pi * linear(middle, pos)) + 1) / 2
def sphere_increasing(middle, pos):
return sqrt(1 - (linear(middle, pos) - 1) ** 2)
def sphere_decreasing(middle, pos):
return 1 - sqrt(1 - linear(middle, pos) ** 2)
SEGMENTS = [
linear,
curved,
sine,
sphere_increasing,
sphere_decreasing]
class GradientFile:
gradient = None
def getpalette(self, entries = 256):
palette = []
ix = 0
(x0, x1, xm, rgb0, rgb1, segment) = self.gradient[ix]
for i in range(entries):
x = i / float(entries - 1)
while x1 < x:
ix = ix + 1
(x0, x1, xm, rgb0, rgb1, segment) = self.gradient[ix]
w = x1 - x0
if w < EPSILON:
scale = segment(0.5, 0.5)
else:
scale = segment((xm - x0) / w, (x - x0) / w)
r = chr(int(255 * ((rgb1[0] - rgb0[0]) * scale + rgb0[0]) + 0.5))
g = chr(int(255 * ((rgb1[1] - rgb0[1]) * scale + rgb0[1]) + 0.5))
b = chr(int(255 * ((rgb1[2] - rgb0[2]) * scale + rgb0[2]) + 0.5))
a = chr(int(255 * ((rgb1[3] - rgb0[3]) * scale + rgb0[3]) + 0.5))
palette.append(r + g + b + a)
return (string.join(palette, ''), 'RGBA')
class GimpGradientFile(GradientFile):
def __init__(self, fp):
if fp.readline()[:13] != 'GIMP Gradient':
raise SyntaxError, 'not a GIMP gradient file'
count = int(fp.readline())
gradient = []
for i in range(count):
s = string.split(fp.readline())
w = map(float, s[:11])
x0 = w[0]
x1 = w[2]
xm = w[1]
rgb0 = w[3:7]
rgb1 = w[7:11]
segment = SEGMENTS[int(s[11])]
cspace = int(s[12])
if cspace != 0:
raise IOError, 'cannot handle HSV colour space'
gradient.append((x0, x1, xm, rgb0, rgb1, segment))
self.gradient = gradient