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#!/usr/bin/env python
# fake additive blending. Using NumPy. it doesn't clamp.
# press r,g,b
import os, pygame
from pygame.locals import *
try:
import pygame.surfarray
import numpy
except:
print ("no surfarray for you! install numpy")
import time
main_dir = os.path.split(os.path.abspath(__file__))[0]
data_dir = os.path.join(main_dir, 'data')
def main():
pygame.init()
pygame.mixer.quit() # remove ALSA underflow messages for Debian squeeze
screen = pygame.display.set_mode((640, 480))
im1= pygame.Surface(screen.get_size())
#im1= im1.convert()
im1.fill((100, 0, 0))
im2= pygame.Surface(screen.get_size())
im2.fill((0, 50, 0))
# we make a srcalpha copy of it.
#im3= im2.convert(SRCALPHA)
im3 = im2
im3.set_alpha(127)
images = {}
images[K_1] = im2
images[K_2] = pygame.image.load(os.path.join(data_dir, "chimp.bmp"))
images[K_3] = pygame.image.load(os.path.join(data_dir, "alien3.gif"))
images[K_4] = pygame.image.load(os.path.join(data_dir, "liquid.bmp"))
img_to_blit = im2.convert()
iaa = img_to_blit.convert_alpha()
blits = {}
blits[K_a] = BLEND_ADD
blits[K_s] = BLEND_SUB
blits[K_m] = BLEND_MULT
blits[K_EQUALS] = BLEND_MAX
blits[K_MINUS] = BLEND_MIN
blitsn = {}
blitsn[K_a] = "BLEND_ADD"
blitsn[K_s] = "BLEND_SUB"
blitsn[K_m] = "BLEND_MULT"
blitsn[K_EQUALS] = "BLEND_MAX"
blitsn[K_MINUS] = "BLEND_MIN"
screen.blit(im1, (0, 0))
pygame.display.flip()
clock = pygame.time.Clock()
print ("one pixel is:%s:" % [im1.get_at((0,0))])
going = True
while going:
clock.tick(60)
for event in pygame.event.get():
if event.type == QUIT:
going = False
if event.type == KEYDOWN:
usage()
if event.type == KEYDOWN and event.key == K_ESCAPE:
going = False
elif event.type == KEYDOWN and event.key in images.keys():
img_to_blit = images[event.key]
iaa = img_to_blit.convert_alpha()
elif event.type == KEYDOWN and event.key in blits.keys():
t1 = time.time()
# blits is a dict keyed with key -> blit flag. eg BLEND_ADD.
im1.blit(img_to_blit, (0,0), None, blits[event.key])
t2 = time.time()
print ("one pixel is:%s:" % [im1.get_at((0,0))])
print ("time to do:%s:" % (t2-t1))
elif event.type == KEYDOWN and event.key in [K_t]:
for bkey in blits.keys():
t1 = time.time()
for x in range(300):
im1.blit(img_to_blit, (0,0), None, blits[bkey])
t2 = time.time()
# show which key we're doing...
onedoing = blitsn[bkey]
print ("time to do :%s: is :%s:" % (onedoing, t2-t1))
elif event.type == KEYDOWN and event.key in [K_o]:
t1 = time.time()
# blits is a dict keyed with key -> blit flag. eg BLEND_ADD.
im1.blit(iaa, (0,0))
t2 = time.time()
print ("one pixel is:%s:" % [im1.get_at((0,0))])
print ("time to do:%s:" % (t2-t1))
elif event.type == KEYDOWN and event.key == K_SPACE:
# this additive blend without clamp two surfaces.
#im1.set_alpha(127)
#im1.blit(im1, (0,0))
#im1.set_alpha(255)
t1 = time.time()
im1p = pygame.surfarray.pixels2d(im1)
im2p = pygame.surfarray.pixels2d(im2)
im1p += im2p
del im1p
del im2p
t2 = time.time()
print ("one pixel is:%s:" % [im1.get_at((0,0))])
print ("time to do:%s:" % (t2-t1))
elif event.type == KEYDOWN and event.key in [K_z]:
t1 = time.time()
im1p = pygame.surfarray.pixels3d(im1)
im2p = pygame.surfarray.pixels3d(im2)
im1p16 = im1p.astype(numpy.uint16)
im2p16 = im1p.astype(numpy.uint16)
im1p16 += im2p16
im1p16 = numpy.minimum(im1p16, 255)
pygame.surfarray.blit_array(im1, im1p16)
del im1p
del im2p
t2 = time.time()
print ("one pixel is:%s:" % [im1.get_at((0,0))])
print ("time to do:%s:" % (t2-t1))
elif event.type == KEYDOWN and event.key in [K_r, K_g, K_b]:
# this adds one to each pixel.
colmap={}
colmap[K_r] = 0x10000
colmap[K_g] = 0x00100
colmap[K_b] = 0x00001
im1p = pygame.surfarray.pixels2d(im1)
im1p += colmap[event.key]
del im1p
print ("one pixel is:%s:" % [im1.get_at((0,0))])
elif event.type == KEYDOWN and event.key == K_p:
print ("one pixel is:%s:" % [im1.get_at((0,0))])
elif event.type == KEYDOWN and event.key == K_f:
# this additive blend without clamp two surfaces.
t1 = time.time()
im1.set_alpha(127)
im1.blit(im2, (0,0))
im1.set_alpha(255)
t2 = time.time()
print ("one pixel is:%s:" % [im1.get_at((0,0))])
print ("time to do:%s:" % (t2-t1))
screen.blit(im1, (0, 0))
pygame.display.flip()
pygame.quit()
def usage():
print ("press keys 1-5 to change image to blit.")
print ("A - ADD, S- SUB, M- MULT, - MIN, + MAX")
print ("T - timing test for special blend modes.")
if __name__ == '__main__':
usage()
main()
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