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fix the unsigned byte issue.

master
Raphaël Vinot 2015-03-05 22:58:41 +01:00
parent a821b22cad
commit fd4089dae9
2 changed files with 5 additions and 4 deletions
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9
v2/backend/processing/pic2serialpy/pic2serialpy.pyde
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@ -26,7 +26,7 @@ def setup():
gammatable = [math.pow(i / 255.0, gamma) * 255.0 + 0.5 for i in range(0, 256)] gammatable = [math.pow(i / 255.0, gamma) * 255.0 + 0.5 for i in range(0, 256)]
size(40, 1) size(40, 1)
img = loadImage("test1.png") img = loadImage("test2.png")
def image2data(data): def image2data(data):
offset = 0 offset = 0
@ -38,8 +38,9 @@ def image2data(data):
for i in range(0, 8): for i in range(0, 8):
if ((pixel[i] & imgmask) != 0): if ((pixel[i] & imgmask) != 0):
b |= (1 << i) b |= (1 << i)
if b == 255: if b > 127:
b = -1 # Convert to signed bytes (expected by jarray)
b -= 2**8
data[offset] = b data[offset] = b
offset += 1 offset += 1
imgmask >>= 1 imgmask >>= 1
@ -89,7 +90,7 @@ def draw():
data[0] = ord('*') data[0] = ord('*')
framerate = 30.0 framerate = 30.0
usec = int((1000000.0 / framerate) * 0.75) usec = int((1000000.0 / framerate) * 0.75)
data[1] = usec /2000 data[1] = (usec % 256) - 2**8
data[2] = usec >> 8 data[2] = usec >> 8
ledSerial.write(data) ledSerial.write(data)

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v2/backend/processing/pic2serialpy/test2.png Normal file
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