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LibWeb: Implement missing step in GFC fr size calculation

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Implements:
"If the product of the hypothetical fr size and a flexible track’s flex
factor is less than the track’s base size, restart this algorithm
treating all such tracks as inflexible."

Fixes https://github.com/LadybirdBrowser/ladybird/issues/1211
This commit is contained in:
Aliaksandr Kalenik 2024-08-30 19:11:43 +02:00 • committed by Andreas Kling
commit 7b2042571b
Notes: github-actions[bot] 2024-08-31 05:48:12 +00:00
3 changed files with 76 additions and 22 deletions
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61
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
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@ -1012,33 +1012,50 @@ void GridFormattingContext::expand_flexible_tracks(GridDimension const dimension
// FIXME: This should idealy take a Span, as that is more idomatic, but Span does not yet support holding references
auto find_the_size_of_an_fr = [&](Vector<GridTrack&> const& tracks, CSSPixels space_to_fill) -> CSSPixelFraction {
// https://www.w3.org/TR/css-grid-2/#algo-find-fr-size
// 1. Let leftover space be the space to fill minus the base sizes of the non-flexible grid tracks.
auto leftover_space = space_to_fill;
for (auto& track : tracks) {
if (!track.max_track_sizing_function.is_flexible_length()) {
leftover_space -= track.base_size;
auto treat_track_as_inflexiable = MUST(AK::Bitmap::create(tracks.size(), false));
do {
// 1. Let leftover space be the space to fill minus the base sizes of the non-flexible grid tracks.
auto leftover_space = space_to_fill;
for (auto track_index = 0u; track_index < tracks.size(); track_index++) {
if (treat_track_as_inflexiable.view().get(track_index) || !tracks[track_index].max_track_sizing_function.is_flexible_length()) {
leftover_space -= tracks[track_index].base_size;
}
}
}
// 2. Let flex factor sum be the sum of the flex factors of the flexible tracks.
// If this value is less than 1, set it to 1 instead.
CSSPixels flex_factor_sum = 0;
for (auto& track : tracks) {
if (track.max_track_sizing_function.is_flexible_length())
flex_factor_sum += CSSPixels::nearest_value_for(track.max_track_sizing_function.flex_factor());
}
if (flex_factor_sum < 1)
flex_factor_sum = 1;
// 2. Let flex factor sum be the sum of the flex factors of the flexible tracks.
// If this value is less than 1, set it to 1 instead.
CSSPixels flex_factor_sum = 0;
for (auto track_index = 0u; track_index < tracks.size(); track_index++) {
if (treat_track_as_inflexiable.view().get(track_index) || !tracks[track_index].max_track_sizing_function.is_flexible_length())
continue;
flex_factor_sum += CSSPixels::nearest_value_for(tracks[track_index].max_track_sizing_function.flex_factor());
}
if (flex_factor_sum < 1)
flex_factor_sum = 1;
// 3. Let the hypothetical fr size be the leftover space divided by the flex factor sum.
auto hypothetical_fr_size = leftover_space / flex_factor_sum;
// 3. Let the hypothetical fr size be the leftover space divided by the flex factor sum.
auto hypothetical_fr_size = leftover_space / flex_factor_sum;
// FIXME: 4. If the product of the hypothetical fr size and a flexible track’s flex factor is less than the track’s
// base size, restart this algorithm treating all such tracks as inflexible.
// 4. If the product of the hypothetical fr size and a flexible track’s flex factor is less than the track’s
// base size, restart this algorithm treating all such tracks as inflexible.
bool need_to_restart = false;
for (auto track_index = 0u; track_index < tracks.size(); track_index++) {
if (treat_track_as_inflexiable.view().get(track_index) || !tracks[track_index].max_track_sizing_function.is_flexible_length())
continue;
auto scaled_fraction = CSSPixels::nearest_value_for(tracks[track_index].max_track_sizing_function.flex_factor()) * hypothetical_fr_size;
if (scaled_fraction < tracks[track_index].base_size) {
treat_track_as_inflexiable.set(track_index, true);
need_to_restart = true;
}
}
if (need_to_restart)
continue;
// 5. Return the hypothetical fr size.
return hypothetical_fr_size;
// 5. Return the hypothetical fr size.
return hypothetical_fr_size;
} while (true);
VERIFY_NOT_REACHED();
};
// First, find the grid’s used flex fraction: