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Turn on high DPI scaling automatically based on the DPI of the monitor.

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Note that this will only work for Qt >= 5.6 so actual testing will have
to wait for calibre 3.0
This commit is contained in:
Kovid Goyal 2016-08-26 20:28:52 +05:30
parent ba8363f077
commit f46aade946
1 changed files with 12 additions and 0 deletions
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12
src/calibre/gui2/__init__.py
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@ -873,6 +873,18 @@ class Application(QApplication):
self.headless = headless
qargs = [i.encode('utf-8') if isinstance(i, unicode) else i for i in args]
self.pi = plugins['progress_indicator'][0]
if not isosx and not headless and hasattr(Qt, 'AA_EnableHighDpiScaling'):
# On OS X high dpi scaling is turned on automatically by the OS, so we dont need to set it explicitly
# This requires Qt >= 5.6
for v in ('QT_AUTO_SCREEN_SCALE_FACTOR', 'QT_SCALE_FACTOR', 'QT_SCREEN_SCALE_FACTORS', 'QT_DEVICE_PIXEL_RATIO'):
if os.environ.get(v):
break
else:
# Should probably make a preference to allow the user to
# control this, if needed.
# Could have options: auto, off, 0.75, 1, 1.25, 1.5, 1.75, 2,
# 2.25, 2.5
QApplication.setAttribute(Qt.AA_EnableHighDpiScaling, True)
QApplication.__init__(self, qargs)
self.setAttribute(Qt.AA_UseHighDpiPixmaps)
if not iswindows: