bpo-33656: On Windows, add API call saying that tk scales for DPI (GH-7137)
On Windows 8.1+ or 10, with DPI compatibility properties of the Python binary
unchanged, and a monitor resolution greater than 96 DPI, this should
make text and lines sharper. It should otherwise have no effect.
Using a magnifier, I determined that the improvement comes from horizontal and
lines being better lined up with the monitor pixels. I checked that this call causes
no problem on any Windows buildbot, including the Win7 buildbots. Unlike most
IDLE patches, this one can be easily reverted by users by removing a few lines,
at the top of idlelib/pyshell.py.
(cherry picked from commit 800415e3df69f494afe9f95a8563ce17609fe1da)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
diff --git a/Lib/idlelib/pyshell.py b/Lib/idlelib/pyshell.py
index ee13131..f39f156 100755
--- a/Lib/idlelib/pyshell.py
+++ b/Lib/idlelib/pyshell.py
@@ -8,6 +8,14 @@
print("** IDLE can't import Tkinter.\n"
"Your Python may not be configured for Tk. **", file=sys.__stderr__)
raise SystemExit(1)
+
+if sys.platform == 'win32':
+ import ctypes
+ try:
+ ctypes.OleDLL('shcore').SetProcessDpiAwareness(1)
+ except (AttributeError, OSError):
+ pass
+
import tkinter.messagebox as tkMessageBox
if TkVersion < 8.5:
root = Tk() # otherwise create root in main