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LibWeb: Use computed not just absolutized value when computing keyframes

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No functionality changes as we don't yet implement computing any
property values using this method.
This commit is contained in:
Callum Law 2025-08-27 16:40:11 +12:00 • committed by Sam Atkins
commit d4aa40a9fe
Notes: github-actions[bot] 2025-08-28 08:31:31 +00:00
1 changed files with 32 additions and 4 deletions
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36
Libraries/LibWeb/CSS/StyleComputer.cpp
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@ -1103,6 +1103,9 @@ void StyleComputer::collect_animation_into(DOM::Element& element, Optional<CSS::
computed_properties.font_size(),
computed_properties.first_available_computed_font().pixel_metrics()
};
HashMap<PropertyID, RefPtr<StyleValue const>> specified_values;
for (auto const& [property_id, value] : keyframe_values.properties) {
bool is_use_initial = false;
@ -1118,7 +1121,7 @@ void StyleComputer::collect_animation_into(DOM::Element& element, Optional<CSS::
});
if (!style_value) {
result.set(property_id, nullptr);
specified_values.set(property_id, nullptr);
continue;
}
@ -1135,11 +1138,11 @@ void StyleComputer::collect_animation_into(DOM::Element& element, Optional<CSS::
auto physical_longhand_id_bitmap_index = to_underlying(physical_longhand_id) - to_underlying(first_longhand_property_id);
// Don't overwrite values if this is the result of a UseInitial
if (result.contains(physical_longhand_id) && result.get(physical_longhand_id) != nullptr && is_use_initial)
if (specified_values.contains(physical_longhand_id) && specified_values.get(physical_longhand_id) != nullptr && is_use_initial)
return;
// Don't overwrite unless the value was originally set by a UseInitial or this property is preferred over the one that set it originally
if (result.contains(physical_longhand_id) && result.get(physical_longhand_id) != nullptr && !property_is_set_by_use_initial.get(physical_longhand_id_bitmap_index) && !is_property_preferred(property_id, longhands_set_by_property_id.get(physical_longhand_id).value()))
if (specified_values.contains(physical_longhand_id) && specified_values.get(physical_longhand_id) != nullptr && !property_is_set_by_use_initial.get(physical_longhand_id_bitmap_index) && !is_property_preferred(property_id, longhands_set_by_property_id.get(physical_longhand_id).value()))
return;
auto const& specified_value_with_css_wide_keywords_applied = [&]() -> StyleValue const& {
@ -1161,9 +1164,34 @@ void StyleComputer::collect_animation_into(DOM::Element& element, Optional<CSS::
longhands_set_by_property_id.set(physical_longhand_id, property_id);
property_is_set_by_use_initial.set(physical_longhand_id_bitmap_index, is_use_initial);
result.set(physical_longhand_id, { specified_value_with_css_wide_keywords_applied.absolutized(viewport_rect(), font_metrics, m_root_element_font_metrics) });
specified_values.set(physical_longhand_id, specified_value_with_css_wide_keywords_applied);
});
}
PropertyValueComputationContext property_value_computation_context {
.length_resolution_context = {
.viewport_rect = viewport_rect(),
.font_metrics = font_metrics,
.root_font_metrics = m_root_element_font_metrics },
};
// NOTE: This doesn't necessarily return the specified value if we reach into computed_properties but that
// doesn't matter as a computed value is always valid as a specified value.
Function<NonnullRefPtr<StyleValue const>(PropertyID)> get_property_specified_value = [&](PropertyID property_id) -> NonnullRefPtr<StyleValue const> {
if (auto keyframe_value = specified_values.get(property_id); keyframe_value.has_value() && keyframe_value.value())
return *keyframe_value.value();
return computed_properties.property(property_id);
};
for (auto const& [property_id, style_value] : specified_values) {
if (!style_value)
continue;
auto const& computed_value = compute_value_of_property(property_id, *style_value, get_property_specified_value, property_value_computation_context);
result.set(property_id, computed_value->absolutized(viewport_rect(), font_metrics, m_root_element_font_metrics));
}
return result;
};
HashMap<PropertyID, RefPtr<StyleValue const>> computed_start_values = compute_keyframe_values(keyframe_values);