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LibWeb: Properly round CSSPixels values in device_to_css_rect

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Ceiling width or height of a chrome viewport (this function is only used
when a chrome notifies LibWeb about a new viewport size) is never
correct. If we do that, PageClient::page_did_layout will set content
size to be 1 larger than an actual physical width or height respectively
(it always ceils) and thus a spurious scrollbar will appear.

This prevents occasional scrollbar flickering in Ladybird/Qt on Wayland
with fractional scaling enabled on compositors supporting
wp-fractional-scale-v1.
This commit is contained in:
Dan Klishch 2024-02-07 22:46:39 -05:00 • committed by Alexander Kalenik
parent 7bee1c9897
commit 56d355a15e
2 changed files with 13 additions and 4 deletions
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8
Userland/Libraries/LibWeb/Page/Page.cpp
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@ -120,10 +120,10 @@ CSSPixelRect Page::device_to_css_rect(DevicePixelRect rect) const
{
auto scale = client().device_pixels_per_css_pixel();
return {
rect.x().value() / scale,
rect.y().value() / scale,
rect.width().value() / scale,
rect.height().value() / scale
CSSPixels::nearest_value_for(rect.x().value() / scale),
CSSPixels::nearest_value_for(rect.y().value() / scale),
CSSPixels::floored_value_for(rect.width().value() / scale),
CSSPixels::floored_value_for(rect.height().value() / scale),
};
}