How to effectively mask a surface in pygame

Question

I mask the surface in pygame, as suggested by nkorth in response to the question , is there any way just to update or update in the mask , update the mask and masked surfaces of each frame. And although this can be achieved using his method, the frame rate decreases immediately and that only one instance of this surface is visualized on the screen at any given time.

Here is the image I want to hide, and here is how it should look in the application. These other circles are not important, they are created sequentially and drawn on top of each other. I tried to compress the image to 100kb (more than 10 times larger than the original size), but it only helped a bit. It still works poorly.

Is this possible on pygame? If so, how?

Here is the appropriate class for this:

class NoiseCircle(Circle):

    def __init__(self, center=SCREEN_CENTER, radius=5):
        # init code

    ...

    def draw(self, surf):
        self.masked.blit(self.noise_image, (0, 0))
        self.mask.fill((0, 0, 0, 0))
        pygame.draw.circle(self.mask, (255, 255, 255), self.center, self.radius)
        self.masked.blit(self.mask, (0, 0), None, pygame.BLEND_RGBA_MULT)
        pygame.draw.circle(self.masked, (0, 0, 0), self.center, self.radius, 1)
        surf.blit(self.masked, (0, 0))

The main loop simply passes the display surface for drawing (), and this takes care of rendering the object.

Answer 1

, . , draw.circle. , ( , ). pygame 1.9.2 Windows, - Atom 1,6 , 40 (. DT ). , . . , colorkey?

def circle(r, x0, y0, dest, value):
    x1 = int(r / math.sqrt(2))
    h = []
    x = x1
    while(1):
        x += 1
        if x == r:
            h.append(ch/3)
            break
        ch = int(math.sqrt(r**2-x**2))
        h.append(ch)
    p = 0
    dest[x0-x1:x0+x1+1, y0-x1:y0+x1+1] = value  
    while p < len(h):
        dest[x0+x1+p+1, y0-h[p]:y0+h[p]+1] = value
        dest[x0-x1-p-1, y0-h[p]:y0+h[p]+1] = value
        dest[x0-h[p]:x0+h[p]+1, y0-x1-p-1] = value
        dest[x0-h[p]:x0+h[p]+1, y0+x1+p+1] = value
        p += 1

def put_alpha(Dest, Src):                       # write alpha values
    ref = pygame.surfarray.pixels_alpha (Dest)
    numpy.copyto(ref, Src) 
    del ref


Layer = pygame.Surface ((w,h),flags = pygame.SRCALPHA)
Layer.fill(0xff4B432E)
Mask = numpy.zeros((w,h), dtype = numpy.uint8)
Mask[:] = 255
cur_time = pygame.time.get_ticks()
old_time = cur_time

circle(125, 400, 300, Mask, 125)
circle(75, 400, 300, Mask, 255)
put_alpha(Layer, Mask)

cur_time = pygame.time.get_ticks()
DT = cur_time - old_time
print DT

---

: -, 5 , pygame, , . . -, , 24- , 256 , . , "24 32 24". . .

pygame.init()
w = 800
h = 600
DISP = pygame.display.set_mode((w, h), 0, 24)
clock = pygame.time.Clock( ) 

Noise = pygame.Surface ((w,h))
Noise.fill((110,0,10))  
color24bit = (169, 163, 144)    # r g b
color = (169, 163, 144, 255)    # r g b a
color_a = (169, 163, 144, 112)  # r g b a
Layer = pygame.Surface ((w,h), flags = pygame.SRCALPHA)
Layer.fill(color)       # ( 169, 163, 144, 255)

Layer_colorkey = pygame.Surface ((w,h))
Layer_colorkey.fill(color24bit)
color_key = (50, 50, 50)
Layer_colorkey.set_colorkey(color_key)

print Noise.get_bitsize(), Layer.get_bitsize(), Layer_colorkey.get_bitsize()

Mask = numpy.zeros((w,h), dtype = numpy.uint8)
Mask[:] = 255

t=0
cur_time = pygame.time.get_ticks()
old_time = cur_time

# 1. blit with per-pixel alpha and custom Mask array
while t < 0:
    circle(296, 400, 300, Mask, 112)
    circle(15, 400, 300, Mask, 255)
    put_alpha(Layer, Mask)
    Noise.blit(Layer,(0,0))
    DISP.blit(Noise,(0,0))
    t += 1

# 2. blit with per-pixel alpha and draw functions
while t < 0:
    pygame.draw.circle(Layer, color_a, (400,300), 296, 0)
    pygame.draw.circle(Layer, color, (400,300), 15, 0)
    Noise.blit(Layer,(0,0))
    DISP.blit(Noise,(0,0))
    t += 1

# 3. blit with colorkey 
while t < 1:
    pygame.draw.circle(Layer_colorkey, color_key, (400,300), 296, 0)
    pygame.draw.circle(Layer_colorkey, color, (400,300), 15, 0)
    Noise.blit(Layer_colorkey,(0,0))
    DISP.blit(Noise,(0,0))
    t += 1

cur_time = pygame.time.get_ticks()
DT = cur_time - old_time
print "time:", DT

:
1. : , .
2. + , -. Litle (ITPC), .
3. 24- colorkey. 2x , , .