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Only calculate LUMA deltas when necessary

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Andrew Murray 2025-06-11 19:29:04 +10:00
parent a714db9057
commit 2e8e86cba1
1 changed files with 9 additions and 8 deletions
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9
src/PIL/QoiImagePlugin.py
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@ -182,12 +182,10 @@ class QoiEncoder(ImageFile.PyEncoder):
self._previously_seen_pixels[hash_value] = pixel self._previously_seen_pixels[hash_value] = pixel
pr, pg, pb, pa = self._previous_pixel pr, pg, pb, pa = self._previous_pixel
if a == pa: if pa == a:
dr = self._delta(r, pr) dr = self._delta(r, pr)
dg = self._delta(g, pg) dg = self._delta(g, pg)
db = self._delta(b, pb) db = self._delta(b, pb)
dgr = self._delta(dr, dg)
dgb = self._delta(db, dg)
if -2 <= dr < 2 and -2 <= dg < 2 and -2 <= db < 2: if -2 <= dr < 2 and -2 <= dg < 2 and -2 <= db < 2:
data += o8( data += o8(
@ -196,7 +194,10 @@ class QoiEncoder(ImageFile.PyEncoder):
| (dg + 2) << 2 | (dg + 2) << 2
| (db + 2) | (db + 2)
) # QOI_OP_DIFF ) # QOI_OP_DIFF
elif -8 <= dgr < 8 and -32 <= dg < 32 and -8 <= dgb < 8: else:
dgr = self._delta(dr, dg)
dgb = self._delta(db, dg)
if -8 <= dgr < 8 and -32 <= dg < 32 and -8 <= dgb < 8:
data += o8(0b10000000 | (dg + 32)) # QOI_OP_LUMA data += o8(0b10000000 | (dg + 32)) # QOI_OP_LUMA
data += o8((dgr + 8) << 4 | (dgb + 8)) data += o8((dgr + 8) << 4 | (dgb + 8))
else: else: