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Use device pixel ration when generating thumbnails for high res rendering

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Kovid Goyal 2025-12-22 19:59:04 +05:30
parent e9e23e8075
commit f1efd5fee5
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1 changed files with 11 additions and 2 deletions
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13
src/calibre/gui2/library/bookshelf_view.py
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@ -892,11 +892,11 @@ class BookshelfView(MomentumScrollMixin, QAbstractScrollArea):
self.expanded_cover.updated.connect(self.update_viewport)
self.layout_constraints = LayoutConstraints()
self.layout_constraints = lc = self.layout_constraints._replace(width=self._get_available_width())
self.layout_constraints = self.layout_constraints._replace(width=self._get_available_width())
self.cover_cache = CoverThumbnailCache(
name='bookshelf-thumbnail-cache', ram_limit=800,
max_size=gprefs['bookshelf_disk_cache_size'], thumbnailer=ThumbnailerWithDominantColor(),
thumbnail_size=(lc.max_spine_width, lc.spine_height), parent=self, version=2,
thumbnail_size=self.thumbnail_size(), parent=self, version=2,
)
self.cover_cache.rendered.connect(self.update_viewport, type=Qt.ConnectionType.QueuedConnection)
@ -913,6 +913,12 @@ class BookshelfView(MomentumScrollMixin, QAbstractScrollArea):
self.template_title_is_empty = True
self.template_statue_is_empty = True
def thumbnail_size(self) -> tuple[int, int]:
lc = self.layout_constraints
dpr = self.devicePixelRatioF()
sz = QSizeF(lc.max_spine_width * dpr, lc.spine_height * dpr).toSize()
return sz.width(), sz.height()
# Templates rendering methods
def init_template(self, db):
@ -1365,7 +1371,10 @@ class BookshelfView(MomentumScrollMixin, QAbstractScrollArea):
# Draw with opacity
painter.save()
painter.setOpacity(0.3) # 30% opacity
dpr = thumbnail.devicePixelRatioF()
thumbnail.setDevicePixelRatio(self.devicePixelRatioF())
painter.drawPixmap(rect, thumbnail)
thumbnail.setDevicePixelRatio(dpr)
painter.restore()
# Cover integration methods