Output scaling causes 1px gaps / slightly wrong resolution in native apps

[LeaPhant]

Using an output scale (no matter if integer or fractional) causes gaps on the sides of windows and between parts of the windows where the wallpaper shows through. These gaps don't show up on screenshots taken with jay screenshot but they're visible irl:

Additionally it seems (native Wayland) clients see a slightly wrong resolution when scaling is used, even while fullscreened:

mpv 3839x2159
Minecraft (system glfw) 3839x2160
Testufo (Zen Browser) 3839x2160

It doesn't seem to cause any obvious scaling artifacts but it might hint at the underlying issue.

---

• jay version: 1.11.0 (150ead21272754e454e44195bffcc6635413cda1)
• jay config used in this testing:

[[outputs]]
match.connector = "DP-1"
mode = { width = 3840, height = 2160, refresh-rate = 239.99 }
scale = 1.35

[theme]
border-width = 0
bg-color = "#ff0000"

[shortcuts]
logo-Return = { type = "exec", exec = "ghostty" }
logo-d = { type = "exec", exec = "bemenu-run" }

logo-f = "toggle-fullscreen"
logo-shift-q = "close"
logo-space = "toggle-floating"
logo-shift-Left = "move-left"
logo-shift-Right = "move-right"

ctrl-alt-F1 = { type = "switch-to-vt", num = 1 }
ctrl-alt-F2 = { type = "switch-to-vt", num = 2 }

logo-shift-e = "quit"
logo-shift-r = "reload-config-toml"

[mahkoh]

Using an output scale (no matter if integer or fractional) causes gaps on the sides of windows and between parts of the windows where the wallpaper shows through.

Gaps at the bottom and right of the screen are expected. I'll have to look into the other gaps.

Additionally it seems (native Wayland) clients see a slightly wrong resolution when scaling is used, even while fullscreened:

This behavior is expected. Sizes are communicated in logical pixels and with fractional scaling some physical pixel sizes don't have logical equivalents.

[LeaPhant]

This behavior is expected. Sizes are communicated in logical pixels and with fractional scaling some physical pixel sizes don't have logical equivalents.

Thanks, good to know! Managed to get exact resolutions with 1.33 scale.

[mahkoh]

#796 should have fixed all of the gaps except at the bottom and right edges of toplevels. I'll have to think about what's the best way to handle those.

[LeaPhant]

I can confirm all but the mentioned bottom/right gaps are fixed on current master.