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LibWeb: Implement CSS round()

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stelar7 2023-05-27 16:07:50 +02:00 • committed by Sam Atkins
parent ec0054da06
commit b2230c826b
4 changed files with 210 additions and 0 deletions
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104
Userland/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.cpp
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@ -1527,6 +1527,110 @@ ErrorOr<void> ExpCalculationNode::dump(StringBuilder& builder, int indent) const
return {};
}
ErrorOr<NonnullOwnPtr<RoundCalculationNode>> RoundCalculationNode::create(RoundingMode mode, NonnullOwnPtr<CalculationNode> x, NonnullOwnPtr<CalculationNode> y)
{
return adopt_nonnull_own_or_enomem(new (nothrow) RoundCalculationNode(mode, move(x), move(y)));
}
RoundCalculationNode::RoundCalculationNode(RoundingMode mode, NonnullOwnPtr<CalculationNode> x, NonnullOwnPtr<CalculationNode> y)
: CalculationNode(Type::Round)
, m_mode(mode)
, m_x(move(x))
, m_y(move(y))
{
}
RoundCalculationNode::~RoundCalculationNode() = default;
ErrorOr<String> RoundCalculationNode::to_string() const
{
StringBuilder builder;
builder.append("round("sv);
switch (m_mode) {
case RoundingMode::Nearest:
builder.append("nearest"sv);
break;
case RoundingMode::Up:
builder.append("up"sv);
break;
case RoundingMode::Down:
builder.append("down"sv);
break;
case RoundingMode::TowardZero:
builder.append("toward-zero"sv);
break;
}
builder.append(", "sv);
builder.append(TRY(m_x->to_string()));
builder.append(", "sv);
builder.append(TRY(m_y->to_string()));
builder.append(")"sv);
return builder.to_string();
}
Optional<CalculatedStyleValue::ResolvedType> RoundCalculationNode::resolved_type() const
{
// Note: We check during parsing that all values have the same type
return m_x->resolved_type();
}
bool RoundCalculationNode::contains_percentage() const
{
return m_x->contains_percentage() || m_y->contains_percentage();
}
CalculatedStyleValue::CalculationResult RoundCalculationNode::resolve(Optional<Length::ResolutionContext const&> context, CalculatedStyleValue::PercentageBasis const& percentage_basis) const
{
auto resolved_type = m_x->resolved_type().value();
auto node_a = m_x->resolve(context, percentage_basis);
auto node_b = m_y->resolve(context, percentage_basis);
auto node_a_value = resolve_value(node_a.value(), context);
auto node_b_value = resolve_value(node_b.value(), context);
auto upper_b = ceil(node_a_value / node_b_value) * node_b_value;
auto lower_b = floor(node_a_value / node_b_value) * node_b_value;
if (m_mode == RoundingMode::Nearest) {
auto upper_diff = fabs(upper_b - node_a_value);
auto lower_diff = fabs(node_a_value - lower_b);
auto rounded_value = upper_diff < lower_diff ? upper_b : lower_b;
return to_resolved_type(resolved_type, rounded_value);
}
if (m_mode == RoundingMode::Up) {
return to_resolved_type(resolved_type, upper_b);
}
if (m_mode == RoundingMode::Down) {
return to_resolved_type(resolved_type, lower_b);
}
if (m_mode == RoundingMode::TowardZero) {
auto upper_diff = fabs(upper_b);
auto lower_diff = fabs(lower_b);
auto rounded_value = upper_diff < lower_diff ? upper_b : lower_b;
return to_resolved_type(resolved_type, rounded_value);
}
VERIFY_NOT_REACHED();
}
ErrorOr<void> RoundCalculationNode::for_each_child_node(Function<ErrorOr<void>(NonnullOwnPtr<CalculationNode>&)> const& callback)
{
TRY(m_x->for_each_child_node(callback));
TRY(m_y->for_each_child_node(callback));
TRY(callback(m_x));
TRY(callback(m_y));
return {};
}
ErrorOr<void> RoundCalculationNode::dump(StringBuilder& builder, int indent) const
{
TRY(builder.try_appendff("{: >{}}ROUND: {}\n", "", indent, TRY(to_string())));
return {};
}
void CalculatedStyleValue::CalculationResult::add(CalculationResult const& other, Optional<Length::ResolutionContext const&> context, PercentageBasis const& percentage_basis)
{
add_or_subtract_internal(SumOperation::Add, other, context, percentage_basis);