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tools: rle_encode: Experimental color encoder

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The output from this is a bit too bulky so the code isn't hooked up
to anything at the moment.
This commit is contained in:
Daniel Thompson 2020-01-28 21:19:06 +00:00
parent fbc5ee87d2
commit 28640d431e
1 changed files with 57 additions and 10 deletions
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67
tools/rle_encode.py
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@ -9,27 +9,74 @@ def encode(im):
rle = []
rl = 0
px = 0
px = pixels[0, 0]
def encode_pixel(px, rl):
while rl > 255:
rle.append(255)
rle.append(0)
rl -= 255
rle.append(rl)
for y in range(im.height):
for x in range(im.width):
newpx = pixels[x, y]
if newpx == px:
if rl < 255:
rl += 1
else:
# Handle overflow
rle.append(255)
rle.append(0)
rl = 1
rl += 1
assert(rl < (1 << 21))
continue
# Code the previous run
encode_pixel(px, rl)
# Start a new run
rle.append(rl)
rl = 1
px = newpx
# Handle the final run
rle.append(rl)
encode_pixel(px, rl)
return (im.width, im.height, bytes(rle))
def encode_8bit(im):
pixels = im.load()
rle = []
rl = 0
px = pixels[0, 0]
def encode_pixel(px, rl):
print(rl)
px = (px[0] & 0xe0) | ((px[1] & 0xe0) >> 3) | ((px[2] & 0xc0) >> 6)
rle.append(px)
if rl > 0:
rle.append(px)
rl -= 2
if rl > (1 << 14):
rle.append(0x80 | ((rl >> 14) & 0x7f))
if rl > (1 << 7):
rle.append(0x80 | ((rl >> 7) & 0x7f))
if rl >= 0:
rle.append( rl & 0x7f )
for y in range(im.height):
for x in range(im.width):
newpx = pixels[x, y]
if newpx == px:
rl += 1
assert(rl < (1 << 21))
continue
# Code the previous run
encode_pixel(px, rl)
# Start a new run
rl = 1
px = newpx
# Handle the final run
encode_pixel(px, rl)
return (im.width, im.height, bytes(rle))