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add alpha blending in the server

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Jan Klopper 2016-04-28 21:43:08 +02:00
parent f5ed892bc1
commit 235091aac7
1 changed files with 11 additions and 1 deletions
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12
vloed.py
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@ -71,7 +71,17 @@ class Canvas(object):
def Pixel(self, x, y, r, g, b, a=255): # pylint: disable=C0103
"""Print a pixel to the screen"""
try:
self.pixels[x][y] = (r*256*256) + (g*256) + b
if a != 255:
self.pixels[x][y] = (r*256*256) + (g*256) + b
else:
old = self.pixels[x][y]
oldr = old >> 16
oldg = (old & 0x00ff00) / 256
oldb = old & 0x0000ff
red = (r * a) + (oldr * (1.0 - a))
green = (g * a) + (oldg * (1.0 - a))
blue = (b * a) + (oldb * (1.0 - a))
self.pixels[x][y] = (red*256*256) + (green*256) + blue
except IndexError:
pass