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set_pixels_for_greyscale(): don't modify input buffer.

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antirez
2024-03-16 23:26:53 +01:00
parent 4bb166ea30
commit 79e1f9ac57
1 changed files with 9 additions and 13 deletions
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22
uc8151.py
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@@ -610,8 +610,11 @@ class UC8151:
# of greys in the same update. The image to render should be in
# 'grey', where each byte maps to a pixel: higher values means
# a more intense level of grey.
#
# The three level of greys that this function will match are
# given by 'level': from level to level+2 inclusive.
@micropython.viper
def set_pixels_for_greyscale(self, grey:ptr8, fb1:ptr8, fb2:ptr8, width:int, height:int) -> int:
def set_pixels_for_greyscale(self, grey:ptr8, fb1:ptr8, fb2:ptr8, width:int, height:int, level:int) -> int:
count = int(width*height)
anypixel = int(0)
for i in range(count//8):
@@ -624,25 +627,18 @@ class UC8151:
byte = i >> 3
bit = 1 << (7-(i&7))
if grey[i] == 1: # WW condition
if grey[i] == level: # WW condition
anypixel = 1
pass # Both bits at 0
elif grey[i] == 2: # BB condition
pass
elif grey[i] == level+1: # BB condition
anypixel = 1
fb1[byte] |= bit
fb2[byte] |= bit
elif grey[i] == 3: # WB condition
elif grey[i] == level+2: # WB condition
anypixel = 1
fb1[byte] |= bit
else: # BW condition, pixels not touched.
fb2[byte] |= bit
# We decrement all the pixels not yet at 0, so successive
# level of greys will appear at values 1, 2, 3.
if grey[i] > 3:
grey[i] -= 3
else:
grey[i] = 0
return anypixel
def load_greyscale_image(self,filename):
@@ -686,7 +682,7 @@ class UC8151:
for g in range(0,greyscale,3):
# Resort to a faster method in Viper to set the pixels for the
# current greyscale level.
anypixel = self.set_pixels_for_greyscale(imgdata,self.raw_fb,fb2,self.width,self.height)
anypixel = self.set_pixels_for_greyscale(imgdata,self.raw_fb,fb2,self.width,self.height,g+1)
if anypixel:
# Transfer the "old" image, so that for difference
# with the new we transfer via .update() we create