#
# 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 __future__ import annotations
from math import log, pi, sin, sqrt
from typing import IO, Callable
from ._binary import o8
EPSILON = 1e-10
"""""" # Enable auto-doc for data member
[docs]
def linear(middle: float, pos: float) -> float:
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
[docs]
def curved(middle: float, pos: float) -> float:
return pos ** (log(0.5) / log(max(middle, EPSILON)))
[docs]
def sine(middle: float, pos: float) -> float:
return (sin((-pi / 2.0) + pi * linear(middle, pos)) + 1.0) / 2.0
[docs]
def sphere_increasing(middle: float, pos: float) -> float:
return sqrt(1.0 - (linear(middle, pos) - 1.0) ** 2)
[docs]
def sphere_decreasing(middle: float, pos: float) -> float:
return 1.0 - sqrt(1.0 - linear(middle, pos) ** 2)
SEGMENTS = [linear, curved, sine, sphere_increasing, sphere_decreasing]
"""""" # Enable auto-doc for data member
[docs]
class GradientFile:
gradient: (
list[
tuple[
float,
float,
float,
list[float],
list[float],
Callable[[float, float], float],
]
]
| None
) = None
[docs]
def getpalette(self, entries: int = 256) -> tuple[bytes, str]:
assert self.gradient is not None
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"
[docs]
class GimpGradientFile(GradientFile):
"""File handler for GIMP's gradient format."""
def __init__(self, fp: IO[bytes]) -> None:
if fp.readline()[:13] != b"GIMP Gradient":
msg = "not a GIMP gradient file"
raise SyntaxError(msg)
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)
self.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:
msg = "cannot handle HSV colour space"
raise OSError(msg)
self.gradient.append((x0, x1, xm, rgb0, rgb1, segment))