try:

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

except IOError:

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

exit(-1)

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

cpd_values = [value / 100.0 for value in range(4000, 50, -1)]

num_valid = sum([1 for value in cpd_values if value > cpd])

samples = [cpd]

for x in range(0, num_samples+1):

y = num_valid * math.sqrt((1 - ((x*x) / float(num_samples*num_samples))))

if int(y) < len(cpd_values):

samples.append(cpd_values[int(y)])

maker = generator.lowPassFilterBatch(samples, concurrent=concurrent, supress=True)

(pos_x, pos_y) = position

radius = window_radius - (len(samples) * 2) #start the radius as smaller than the real radius, it will work out

#Set up the initial values of the output surface.

#For efficiency we pass in the actual screen as an argument, instead we could initialize a new surface and draw and return that

screen.set_colorkey((0,0,0)) #colorkey is the replaced value

screen.blit(samples[-1], (pos_x - radius, pos_y - radius), (pos_x - radius, pos_y - radius, radius*2, radius*2)) #this copies only the relavent portion of the clearest image. Since its the smallest, the smaller square comes out

#loop over each sample but the blurriest, draw a circle of transparency, and paste it over the output surface

for index in range(2, len(samples) - 1):

radius += 2

dubradius = radius*2

noutput = pygame.Surface((dubradius, dubradius)) #needs a new surface for a) effiency and b) so that the samples are not altered

noutput.blit(samples[-index], (0,0), (pos_x - radius, pos_y - radius, dubradius, dubradius)) #again only copy the relavent area, its alot faster than the whole thing

noutput.set_colorkey((0,0,0), pygame.RLEACCEL)

pygame.draw.circle(noutput, (0,0,0), (radius, radius), radius) #since the box is only radius*2 in each dimension, the circle is positioned at its center, or (radius, radius)

screen.blit(noutput, (pos_x - radius, pos_y - radius))

#now do it again for the blurriest image, samples[0], except this time the entire image is used

radius += 2

noutput = samples[0].copy() #thus we copy instead of blitting

pygame.draw.circle(noutput, (0,0,0), position, radius) #and the circle is now at the input position, since its full sized instead of a cutout

noutput.set_colorkey((0,0,0), pygame.RLEACCEL)

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("-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()

cpd = args.cycles_per_degree

filename = args.source_file

pygame.init()

samples = make_window_prereqs(cpd, filename, concurrent=args.concurrent)

screen = pygame.display.set_mode((1024,768))

screen.blit(samples[0], (0,0))

running = True

frame_times = []

print("average frame time: 0ms")

while running:

t1 = time.time()

window(screen, samples, 300, pygame.mouse.get_pos())

t2 = time.time()

frame_times.append((t2 - t1) * 1000.0)

pygame.display.flip()

print("\raverage frame time: {0}ms".format(sum(frame_times)/len(frame_times)))

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: