Edward O eddy-geek

KDE Bug 466373 – Qt apps don't use wp-fractional-scale-v1 for hidpi fractional scaling on Wayland

SUMMARY Qt client apps using system Qt 5.15.8 still use the old downscaling mechanism to deal with fractional scaling, instead of wp-fractional-scale-v1, leading to visual artefacts.

STEPS TO REPRODUCE

Set "Scale" to fractional eg 135% in Display Configuration
Open a Qt app

OBSERVED RESULT

Main bug: Can't share screen on a Wayland session with Firefox https://bugs.kde.org/show_bug.cgi?id=439607

from what I can see only Hirsuite (21.04) has xdg-desktop-portal built with PipeWire support

doesn't seem true anymore (see below)

Code: https://invent.kde.org/libraries/plasma-wayland-protocols/-/merge_requests/1/
Context: https://soyuka.me/make-screen-sharing-wayland-sway-work/
Other distros:
- https://soyuka.me/make-screen-sharing-wayland-sway-work/

Comparing length of json-encoded DataFrame. to_json doc

Conclusions with my sample dataset

CSV
- can be signifantly more compact if your data has lots of nans / strings, since their encoding is empty / not-quoted
- but index is lost
- and careful with incompatible quoting if you embed csv in json
split is the most compact json encoding that keeps column and index names, use it over columns (default) / record
- but index name is lost
- and MultiIndex does not wround-trip

	#!/bin/sh
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x0
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x0
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	hda-verb /dev/snd/hwC0D0 0x20 0x480 0x0
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	hda-verb /dev/snd/hwC0D0 0x20 0x480 0x0
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99

	def get_jpg_quality(pim: 'PIL.Image.Image') -> int:
	"""
	Implement quality computation following ImageMagick heuristic algorithm:
	https://github.com/ImageMagick/ImageMagick/blob/7.1.0-57/coders/jpeg.c#L782
	Usage:
	```
	pim = Img.open(...)
	quality = get_jpg_quality(pim)
	```
	See also https://stackoverflow.com/questions/4354543/

	# Copyright (C) 2022 by Edward O.
	# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without l> imitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
	# The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
	# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

	// based on a keyboard map from an 'xkb/symbols/gb' file

	default partial alphanumeric_keys
	xkb_symbols "basic" {

	// Describes the differences between a very simple en_US
	// keyboard and a very simple U.K. keyboard layout defined by
	// the SVR4 European Language Supplement and sometimes also
	// known as the IBM 166 layout.


	partial alphanumeric_keys modifier_keys
	xkb_symbols "dev" {
	name[group1]= "KodeTravel (kode)";
	key.type[group1] = "EIGHT_LEVEL";

	key <AD01> { [ q, Q, 0x1007067, 0x10000b6 ] };
	key <AD02> { [ w, W, egrave, ediaeresis ] };
	key <AD03> { [ e, E, eacute, Greek_epsilon ] };
	key <AD04> { [ r, R, ecircumflex, registered ] };

	#!/usr/bin/env python3
	import os
	import shutil # backups...
	import textwrap # dedent hard-coded symbol strings
	from lxml import etree
	from lxml.builder import E

	XKB = '/usr/share/X11/xkb/'
	NAME = 'lafayette'
	LAYOUTS = {'fr': [{

	from flask import Flask, request, jsonify, json, abort
	from flask_cors import CORS, cross_origin

	import pandas as pd

	app = Flask(__name__)

	cors = CORS(app)
	app.config['CORS_HEADERS'] = 'Content-Type'