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LibWeb: Use fixed-point saturated arithmetics for CSSPixels
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
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136 changed files with 1938 additions and 1844 deletions
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@ -987,7 +987,7 @@ void FlexFormattingContext::resolve_flexible_lengths_for_line(FlexLine& line)
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// AD-HOC: We allow the remaining free space to be infinite, but we can't let infinity
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// leak into the layout geometry, so we treat infinity as zero when used in arithmetic.
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auto remaining_free_space_or_zero_if_infinite = isfinite(line.remaining_free_space.to_double()) ? line.remaining_free_space : 0;
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auto remaining_free_space_or_zero_if_infinite = !line.remaining_free_space.might_be_saturated() ? line.remaining_free_space : 0;
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// c. If the remaining free space is non-zero, distribute it proportional to the flex factors:
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if (line.remaining_free_space != 0) {
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@ -1096,7 +1096,7 @@ void FlexFormattingContext::resolve_flexible_lengths_for_line(FlexLine& line)
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// AD-HOC: Due to the way we calculate the remaining free space, it can be infinite when sizing
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// under a max-content constraint. In that case, we can simply set it to zero here.
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if (!isfinite(line.remaining_free_space.to_double()))
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if (line.remaining_free_space.might_be_saturated())
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line.remaining_free_space = 0;
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// 6. Set each item’s used main size to its target main size.
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