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authorLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-14 16:43:12 +0530
committerLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-14 16:43:12 +0530
commitd47f8b48935d258f4c5c3e2267911753bebd5214 (patch)
tree3ed04e75bc3fc7c8e4ce618f527565da1df630a1 /env/lib/python3.10/site-packages/PIL/GimpGradientFile.py
parent9468226a9e2e2ab8cdd599f1d8538e860ca86120 (diff)
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Diffstat (limited to 'env/lib/python3.10/site-packages/PIL/GimpGradientFile.py')
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diff --git a/env/lib/python3.10/site-packages/PIL/GimpGradientFile.py b/env/lib/python3.10/site-packages/PIL/GimpGradientFile.py
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-#
-# Python Imaging Library
-# $Id$
-#
-# stuff to read (and render) GIMP gradient files
-#
-# History:
-# 97-08-23 fl Created
-#
-# Copyright (c) Secret Labs AB 1997.
-# Copyright (c) Fredrik Lundh 1997.
-#
-# See the README file for information on usage and redistribution.
-#
-
-"""
-Stuff to translate curve segments to palette values (derived from
-the corresponding code in GIMP, written by Federico Mena Quintero.
-See the GIMP distribution for more information.)
-"""
-
-
-from math import log, pi, sin, sqrt
-
-from ._binary import o8
-
-EPSILON = 1e-10
-"""""" # Enable auto-doc for data member
-
-
-def linear(middle, pos):
- if pos <= middle:
- if middle < EPSILON:
- return 0.0
- else:
- return 0.5 * pos / middle
- else:
- pos = pos - middle
- middle = 1.0 - middle
- if middle < EPSILON:
- return 1.0
- 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 / 2.0) + pi * linear(middle, pos)) + 1.0) / 2.0
-
-
-def sphere_increasing(middle, pos):
- return sqrt(1.0 - (linear(middle, pos) - 1.0) ** 2)
-
-
-def sphere_decreasing(middle, pos):
- return 1.0 - sqrt(1.0 - linear(middle, pos) ** 2)
-
-
-SEGMENTS = [linear, curved, sine, sphere_increasing, sphere_decreasing]
-"""""" # Enable auto-doc for data member
-
-
-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 / (entries - 1)
-
- while x1 < x:
- 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)
-
- # expand to RGBA
- r = o8(int(255 * ((rgb1[0] - rgb0[0]) * scale + rgb0[0]) + 0.5))
- g = o8(int(255 * ((rgb1[1] - rgb0[1]) * scale + rgb0[1]) + 0.5))
- b = o8(int(255 * ((rgb1[2] - rgb0[2]) * scale + rgb0[2]) + 0.5))
- a = o8(int(255 * ((rgb1[3] - rgb0[3]) * scale + rgb0[3]) + 0.5))
-
- # add to palette
- palette.append(r + g + b + a)
-
- return b"".join(palette), "RGBA"
-
-
-class GimpGradientFile(GradientFile):
- """File handler for GIMP's gradient format."""
-
- def __init__(self, fp):
-
- if fp.readline()[:13] != b"GIMP Gradient":
- raise SyntaxError("not a GIMP gradient file")
-
- line = fp.readline()
-
- # GIMP 1.2 gradient files don't contain a name, but GIMP 1.3 files do
- if line.startswith(b"Name: "):
- line = fp.readline().strip()
-
- count = int(line)
-
- gradient = []
-
- for i in range(count):
-
- s = fp.readline().split()
- w = [float(x) for x in s[:11]]
-
- x0, x1 = w[0], 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 OSError("cannot handle HSV colour space")
-
- gradient.append((x0, x1, xm, rgb0, rgb1, segment))
-
- self.gradient = gradient