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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/FlexFormattingContext.cpp
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@ -987,7 +987,7 @@ void FlexFormattingContext::resolve_flexible_lengths_for_line(FlexLine& line)
// AD-HOC: We allow the remaining free space to be infinite, but we can't let infinity
// leak into the layout geometry, so we treat infinity as zero when used in arithmetic.
auto remaining_free_space_or_zero_if_infinite = isfinite(line.remaining_free_space.to_double()) ? line.remaining_free_space : 0;
auto remaining_free_space_or_zero_if_infinite = !line.remaining_free_space.might_be_saturated() ? line.remaining_free_space : 0;
// c. If the remaining free space is non-zero, distribute it proportional to the flex factors:
if (line.remaining_free_space != 0) {
@ -1096,7 +1096,7 @@ void FlexFormattingContext::resolve_flexible_lengths_for_line(FlexLine& line)
// AD-HOC: Due to the way we calculate the remaining free space, it can be infinite when sizing
// under a max-content constraint. In that case, we can simply set it to zero here.
if (!isfinite(line.remaining_free_space.to_double()))
if (line.remaining_free_space.might_be_saturated())
line.remaining_free_space = 0;
// 6. Set each item’s used main size to its target main size.