parser = argparse.ArgumentParser(description="Takes in a file and applies a low-pass blur filter. Supported formats are tif, jpg, png, bmp, and gif.")

parser.add_argument("cycles_per_degree", type=float, help="The lower bound cycles per degree of the filter.")

parser.add_argument("source_file", help="Filename of the image to apply the filter to.")

parser.add_argument("destination_file", nargs="?", default=None, help="Filename to write the filtered image to. If not given, the image is display on screen.")

parser.add_argument("-concurrent, -c", dest="concurrent", action="store_true", help="If set, the blur will be generated concurrently. Only supported under Python 3.x and up.")

args = parser.parse_args()

image_prompt = "Filename or directory to blur: "

cpd_prompt = "CPD Bound: "

save_prompt = "Filename or directory to save to: "

saving_error_msg = "Could not save to the indicated path, please make sure the output filename is a valid image format. Exiting."

cpd = args.cycles_per_degree

filename = args.source_file

savedir = args.destination_file

saved_to_dir = False

if savedir is not None:

if os.path.isfile(savedir):

saved_to_dir = False

elif os.path.isdir(savedir):

saved_to_dir = True

else:

if "." not in savedir:

saved_to_dir = True

try:

os.makedirs(savedir)

except:

print("Could not create the destination directory. Exiting.")

exit(-1)

try:

generator = blur.open(filename, blur.Types.PYGAME)

except IOError:

print("Could not open {0} as an image. Exiting.".format(filename))

exit(-1)

pygame.init()

print("Applying filter of {0:f} cycles per degree to {1}".format(cpd, filename))

generator.calcPixelsPerDegree((1024, 768), (36, 27), 61)

try:

generator = generator.lowPassFilter(cpd, concurrent=args.concurrent)

except ImportError:

print("Unable to import concurrency libraries. Ensure you are using Python 3.x or higher. Continuing normally.")

generator = generator.lowPassFilter(cpd, concurrent=False)

output = blur.exportToPygame(generator)

if savedir is not None:

if saved_to_dir:

savepath = os.path.join(savedir, filename)

print("Saving {0} to {1}".format(filename, savepath))

try:

pygame.image.save(output, savepath)

except:

print(saving_error_msg)

exit(-1)

else:

print("Saving {0}".format(savedir))

try:

pygame.image.save(output, savedir)

except:

print(saving_error_msg)

exit(-1)

else:

screen = pygame.display.set_mode(output.get_size())

screen.blit(output, (0,0))

pygame.display.flip()

running = True

while running:

time.sleep(0.01)

for e in pygame.event.get():

if e.type == pygame.KEYDOWN and (e.key == pygame.K_q or e.key == pygame.K_ESCAPE):

running = False

elif e.type == pygame.QUIT: