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LibWeb: Use fixed-point saturated arithmetics for CSSPixels

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Using fixed-point saturated arithmetics for CSSPixels allows to avoid
accumulating floating-point errors.

This implementation is not complete yet: currently saturated
arithmetics implemented only for addition. But it is enough to not
regress any of layout tests we have :)

See https://github.com/SerenityOS/serenity/issues/18566
This commit is contained in:
Aliaksandr Kalenik 2023-07-23 01:09:39 +02:00 • committed by Andreas Kling
parent 5cdd03fc53
commit bec07d4af7
136 changed files with 1938 additions and 1844 deletions
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4
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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@ -803,7 +803,7 @@ void GridFormattingContext::distribute_extra_space_across_spanned_tracks_base_si
// 2. Distribute space up to limits:
// FIXME: If a fixed-point type were used to represent CSS pixels, it would be possible to compare with 0
// instead of epsilon.
while (extra_space > NumericLimits<double>().epsilon()) {
while (extra_space > CSSPixels::epsilon()) {
auto all_frozen = all_of(affected_tracks, [](auto const& track) { return track.base_size_frozen; });
if (all_frozen)
break;
@ -893,7 +893,7 @@ void GridFormattingContext::distribute_extra_space_across_spanned_tracks_growth_
// 2. Distribute space up to limits:
// FIXME: If a fixed-point type were used to represent CSS pixels, it would be possible to compare with 0
// instead of epsilon.
while (extra_space > NumericLimits<double>().epsilon()) {
while (extra_space > CSSPixels::epsilon()) {
auto all_frozen = all_of(affected_tracks, [](auto const& track) { return track.growth_limit_frozen; });
if (all_frozen)
break;