Package: konsole Version: 4:20.12.3-1 Followup-For: Bug #989831 X-Debbugs-Cc: tim@seoss.co.uk On 16/06/2021 05:07, Norbert Preining wrote: > On Mon, 14 Jun 2021, Tim Small wrote: >> instead each character is rendered with large amounts >> of surrounding space. >> >> T h e e f f e c t i s a b i t l i k e t h i s , a n d i s >> >> n o t u s a b l e . >> >> I'm not sure if this is a konsole thing, or a qt/kde thing. > But isn't that what you are asking for by setting a global scale to != 100 > ??? I think what the user expecting when a global scale is set, is "When the application says that graphical elements should be size 'x' on screen, then display it at size 'global scale * x' instead". So e.g. If an application would normally display a graphical element with a font which renders at 10 pixels-tall, then when I have a global scale set to 150%, instead it would try and use font which renders at 15 pixels-tall. I'm assuming that konsole would select a larger font in this case (perhaps it's trying to, but it can't because of #989834, or perhaps the rendering pipeline just doesn't allow this sort of decision to be made). >> p.s. I've tagged this as a11y because I use bitmap fonts AND high dpi >> displays to avoid chronic eye strain (without which I am limited to > I understand hidpi, but why bitmap fonts? vector fonts are also > converted to bitmaps and mostly at better quality, so they should > provide better readability and less strain. The thing that gives me eye strain is anti-aliasing (having spoken to an optometrist about this, they think my visual system perceives the fuzzy edges of anti-aliased fonts as being out-of focus, and then continuously tries to make micro adjustments to my eyes' focal distance to bring it into focus, and this causes muscle fatigue). I know that this is quite a niche problem (especially since high dpi displays are now fine for the vast majority of users), and it was much more of a problem for me before I switched to higher resolution displays), there is some mention of it in section 3.3 of this paper: https://jsonj.co.uk/resources/science/papers/plateau2015-jacques.pdf The optometrist thought I was experiencing this because I have high visual acuity (when I was younger - it was "20/10", and I could read the whole of the bottom row of the optometrists' sight chart). Vector fonts don't give me eye fatigue when anti-aliasing is disabled, and this is a good second best (since konsole includes an option to disable this, presumably because this is a reasonably common request). Unfortunately with anti-aliasing disabled, the vector fonts look lower quality. e.g. see attachment which shows terminus vs noto mono (from konsole screenshots of both typefaces). The vector fonts are not unusable, they're just not as good when rendered like this. After trying various things to try and reduce eye fatigue, my working environment uses two 4k displays - the internal 4k 15" laptop display is OK for anti-aliased fonts (as long as use an external keyboard so that it is about 1 meter away from my eyes - I use display scaling to ensure text isn't too small at this distance), and another 27" 4k display (at the same distance, but I restrict this to working without anti-aliased fonts except for short time periods). I assume a 27" 8k display would be great for me with anti-aliased vector fonts, but these are much more expensive (about 10x more than a 4k display last time I looked). I've found I can workaround this issue by disabling scaling in konsole by launching it with this wrapper: #!/bin/sh export SAVE_QT_SCREEN_SCALE_FACTORS="$QT_SCREEN_SCALE_FACTORS" export SAVE_QT_SCALE_FACTOR="$QT_SCALE_FACTOR" unset QT_SCREEN_SCALE_FACTORS export QT_SCALE_FACTOR=1 exec /usr/bin/konsole ...and then restoring the SAVE variables in the shell rc so that they are not inherited by commands which are launched from within konsole. Tim.
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