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Use a hash to randomize height/width values to avoid visual cycles when sorting by id/timestamp

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Kovid Goyal 2025-12-25 19:01:52 +05:30
parent 81f0462b8e
commit 526212c65d
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1 changed files with 8 additions and 2 deletions
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10
src/calibre/gui2/library/bookshelf_view.py
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@ -62,6 +62,7 @@ from qt.core import (
pyqtProperty,
pyqtSignal,
)
from xxhash import xxh3_64_intdigest
from calibre.db.cache import Cache
from calibre.db.legacy import LibraryDatabase
@ -706,8 +707,13 @@ class LayoutConstraints(NamedTuple):
return self.spine_height + self.shelf_height
def random_from_id(book_id: int, limit: int = 21) -> int:
' Return a pseudo random integer in [0, limit) that is fully determined by book_id '
return xxh3_64_intdigest(b'', seed=book_id) % limit
def height_reduction_for_book_id(book_id: int) -> int:
return (book_id & 0b1111) if gprefs['bookshelf_variable_height'] else 0
return random_from_id(book_id) if gprefs['bookshelf_variable_height'] else 0
class ShelfItem(NamedTuple):
@ -896,7 +902,7 @@ def get_spine_width(book_id: int, db: Cache, spine_size_template: str, template_
ans = log(normalised_size(db.field_for('size', book_id, 0)))
case '{random}' | 'random':
# range: 0.25-0.75
ans = linear((25+(book_id % 50))/100)
ans = linear((25+(random_from_id(book_id, limit=76)))/100)
case _:
with suppress(Exception):
if 0 <= (x := float(spine_size_template)) <= 1: