Blurring in PyGame

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无人共我
无人共我 2020-12-29 16:58

I\'m working on a short intro in PyGame, and I need to blur some static lines. After two days of searching, I can\'t find anything.

Does PyGame have a built-in method

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  • 2020-12-29 17:30

    There's no built-in way to blur a Surface.

    Workarounds are:

    • scale the Surface with pygame.transform.smoothscale and then back to its original size (ugly)

    • iterating over each pixel, get the color of the neighbour pixels, calculate the average value for red, green, and blue, and set the color of that pixel (slow as hell if not using something like numpy)

    I recommend using the Python Imaging Library (PIL), since it's nice and fast.

    Here's a simple and running example:

    import pygame
    from PIL import Image, ImageFilter
    
    pygame.init()
    screen = pygame.display.set_mode((512, 512))
    clock = pygame.time.Clock()
    
    compressed = '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'
    size, image_mode, raw = (128, 128), 'RGBA', compressed.decode("base64").decode("zlib")
    
    # create the original pygame surface
    surf = pygame.image.fromstring(raw, size, image_mode)
    
    # create a PIL image and blur it
    pil_blured = Image.fromstring("RGBA", size, raw).filter(ImageFilter.GaussianBlur(radius=6))
    
    # convert it back to a pygame surface
    other = pygame.image.fromstring(pil_blured.tostring("raw", image_mode), size, image_mode)
    
    pygame.time.set_timer(pygame.USEREVENT, 1000)
    
    while True:
        for e in pygame.event.get():
            if e.type == pygame.USEREVENT: surf, other = other, surf
            if e.type == pygame.QUIT: break
        else:
            screen.fill((255, 255, 255))
            screen.blit(surf, (192, 192))
            pygame.display.flip()
            clock.tick(60)
            continue
        break
    

    enter image description here


    Hint: If you're on Windows and want to install PIL, download it from here and install it via

    pip install Pillow-2.8.2-cp27-none-win32.whl
    

    or whatever version you downloaded (installing PIL on Windows can be a great PITA otherwise).

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