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LibWeb: Add FilterValueListStyleValue

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This style value holds a list of CSS filter function calls e.g.

blur(10px) invert() grayscale()

It will be used to implement backdrop-filter, but the same style value
can be used for the image filter property.

(The name is a little awkward but it's referenced to as
filter-value-list in the spec too).
This commit is contained in:
MacDue 2022-09-15 08:31:14 +01:00 • committed by Sam Atkins
parent 776538a6c4
commit 980c92e9b5
3 changed files with 249 additions and 0 deletions
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171
Userland/Libraries/LibWeb/CSS/StyleValue.cpp
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@ -96,6 +96,12 @@ ContentStyleValue const& StyleValue::as_content() const
return static_cast<ContentStyleValue const&>(*this);
}
FilterValueListStyleValue const& StyleValue::as_filter_value_list() const
{
VERIFY(is_filter_value_list());
return static_cast<FilterValueListStyleValue const&>(*this);
}
FlexStyleValue const& StyleValue::as_flex() const
{
VERIFY(is_flex());
@ -1163,6 +1169,171 @@ bool ContentStyleValue::equals(StyleValue const& other) const
return true;
}
float Filter::Blur::resolved_radius(Layout::Node const& node) const
{
// Default value when omitted is 0px.
auto sigma = 0;
if (radius.has_value())
sigma = radius->resolved(node).to_px(node);
// Note: The radius/sigma of the blur needs to be doubled for LibGfx's blur functions.
return sigma * 2;
}
Filter::DropShadow::Resolved Filter::DropShadow::resolved(Layout::Node const& node) const
{
// The default value for omitted values is missing length values set to 0
// and the missing used color is taken from the color property.
return Resolved {
offset_x.resolved(node).to_px(node),
offset_y.resolved(node).to_px(node),
radius.has_value() ? radius->resolved(node).to_px(node) : 0.0f,
color.has_value() ? *color : node.computed_values().color()
};
}
float Filter::HueRotate::angle_degrees() const
{
// Default value when omitted is 0deg.
if (!angle.has_value())
return 0.0f;
return angle->visit([&](Angle const& angle) { return angle.to_degrees(); }, [&](auto) { return 0.0f; });
}
float Filter::Color::resolved_amount() const
{
if (amount.has_value()) {
if (amount->is_percentage())
return amount->percentage().as_fraction();
return amount->number().value();
}
// All color filters (brightness, sepia, etc) have a default amount of 1.
return 1.0f;
}
String FilterValueListStyleValue::to_string() const
{
StringBuilder builder {};
bool first = true;
for (auto& filter_function : filter_value_list()) {
if (!first)
builder.append(' ');
filter_function.visit(
[&](Filter::Blur const& blur) {
builder.append("blur("sv);
if (blur.radius.has_value())
builder.append(blur.radius->to_string());
},
[&](Filter::DropShadow const& drop_shadow) {
builder.appendff("drop-shadow({} {}"sv,
drop_shadow.offset_x, drop_shadow.offset_y);
if (drop_shadow.radius.has_value())
builder.appendff(" {}", drop_shadow.radius->to_string());
if (drop_shadow.color.has_value()) {
builder.append(' ');
serialize_a_srgb_value(builder, *drop_shadow.color);
}
},
[&](Filter::HueRotate const& hue_rotate) {
builder.append("hue-rotate("sv);
if (hue_rotate.angle.has_value()) {
hue_rotate.angle->visit(
[&](Angle const& angle) {
builder.append(angle.to_string());
},
[&](auto&) {
builder.append('0');
});
}
},
[&](Filter::Color const& color) {
builder.appendff("{}(",
[&] {
switch (color.operation) {
case Filter::Color::Operation::Brightness:
return "brightness"sv;
case Filter::Color::Operation::Contrast:
return "contrast"sv;
case Filter::Color::Operation::Grayscale:
return "grayscale"sv;
case Filter::Color::Operation::Invert:
return "invert"sv;
case Filter::Color::Operation::Opacity:
return "opacity"sv;
case Filter::Color::Operation::Saturate:
return "saturate"sv;
case Filter::Color::Operation::Sepia:
return "sepia"sv;
default:
VERIFY_NOT_REACHED();
}
}());
if (color.amount.has_value())
builder.append(color.amount->to_string());
});
builder.append(')');
first = false;
}
return builder.to_string();
}
static bool operator==(Filter::Blur const& a, Filter::Blur const& b)
{
return a.radius == b.radius;
}
static bool operator==(Filter::DropShadow const& a, Filter::DropShadow const& b)
{
return a.offset_x == b.offset_x && a.offset_y == b.offset_y && a.radius == b.radius && a.color == b.color;
}
static bool operator==(Filter::HueRotate::Zero const&, Filter::HueRotate::Zero const&)
{
return true;
}
static bool operator==(Filter::Color const& a, Filter::Color const& b)
{
return a.operation == b.operation && a.amount == b.amount;
}
static bool operator==(Filter::HueRotate const& a, Filter::HueRotate const& b)
{
return a.angle == b.angle;
}
static bool variant_equals(auto const& a, auto const& b)
{
return a.visit([&](auto const& held_value) {
using HeldType = AK::Detail::Decay<decltype(held_value)>;
bool other_holds_same_type = b.template has<HeldType>();
return other_holds_same_type && held_value == b.template get<HeldType>();
});
}
static bool operator==(Filter::HueRotate::AngleOrZero const& a, Filter::HueRotate::AngleOrZero const& b)
{
return variant_equals(a, b);
}
static bool operator==(FilterFunction const& a, FilterFunction const& b)
{
return variant_equals(a, b);
}
bool FilterValueListStyleValue::equals(StyleValue const& other) const
{
if (type() != other.type())
return false;
auto const& typed_other = other.as_filter_value_list();
if (m_filter_value_list.size() != typed_other.m_filter_value_list.size())
return false;
for (size_t i = 0; i < m_filter_value_list.size(); i++) {
if (m_filter_value_list[i] != typed_other.m_filter_value_list[i])
return false;
}
return true;
}
String FlexStyleValue::to_string() const
{
return String::formatted("{} {} {}", m_grow->to_string(), m_shrink->to_string(), m_basis->to_string());