Gaussian blur radius fix

[yunline]

Fixes #2239

import pygame
import sys

pygame.font.init()

pygame.display.init()
dsf=pygame.display.set_mode((1280,720))
sf=pygame.image.load("lena.png")

radius = 10

from PIL import Image,ImageFilter
img = Image.frombytes(
    "RGBA", sf.get_size(), pygame.image.tobytes(sf, "RGBA", False)
)
img = img.filter(ImageFilter.GaussianBlur(radius=radius))
sf_blur1 = pygame.image.frombuffer(
    img.tobytes(), img.size, "RGBA"
)

sf_blur2 = pygame.transform.gaussian_blur(sf,radius)

dsf.fill((0,150,0))
dsf.blit(sf_blur2,(0,0,1,1))
dsf.blit(sf_blur1,(640,0,1,1))
pygame.display.update()

while 1:
    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            sys.exit()

[Starbuck5]

This changes the behavior of an existing function. I guess it's okay in this case because it's a very new function? Just introduced in 2.2.0? That was still 2.5 months ago...

Nevertheless, this should definitely get a notice in the docs, documenting the change between versions.

[Starbuck5]

Ok, looks good.

[ankith26]

thanks! 🥳

[MyreMylar]

Yep, this fix works for me and gaussian blur now seems to be consistent with other implementations.