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LibWeb+LibGfx: Refactor CSS filters into LibGfx

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CSS filters work similarly to canvas filters, so it makes sense to have
Gfx::Filter that can be used by both libraries in an analogous way
as Gfx::Color.
This commit is contained in:
Lucien Fiorini 2024-12-18 11:34:25 +01:00 • committed by Alexander Kalenik
commit 9fd1223992
Notes: github-actions[bot] 2024-12-18 17:55:46 +00:00
18 changed files with 365 additions and 367 deletions
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20
Libraries/LibWeb/Layout/Node.cpp
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@ -204,7 +204,7 @@ bool Node::establishes_stacking_context() const
// [CSS21] and a Containing Block for absolute and fixed position descendants, unless the
// element it applies to is a document root element in the current browsing context.
// Spec Note: This rule works in the same way as for the filter property.
if (!computed_values().backdrop_filter().is_none() || !computed_values().filter().is_none())
if (!computed_values().backdrop_filter().is_empty() || !computed_values().filter().is_empty())
return true;
// Element with any of the following properties with value other than none:
@ -541,31 +541,31 @@ void NodeWithStyle::apply_style(const CSS::StyleProperties& computed_style)
computed_values.set_order(computed_style.order());
computed_values.set_clip(computed_style.clip());
auto resolve_filter = [this](CSS::Filter const& computed_filter) -> CSS::ResolvedFilter {
CSS::ResolvedFilter resolved_filter;
auto resolve_filter = [this](CSS::Filter const& computed_filter) -> Vector<Gfx::Filter> {
Vector<Gfx::Filter> resolved_filter;
for (auto const& filter : computed_filter.filters()) {
filter.visit(
[&](CSS::FilterOperation::Blur const& blur) {
resolved_filter.filters.append(CSS::ResolvedFilter::Blur {
resolved_filter.append(Gfx::BlurFilter {
.radius = blur.resolved_radius(*this) });
},
[&](CSS::FilterOperation::DropShadow const& drop_shadow) {
auto context = CSS::Length::ResolutionContext::for_layout_node(*this);
// The default value for omitted values is missing length values set to 0
// and the missing used color is taken from the color property.
resolved_filter.filters.append(CSS::ResolvedFilter::DropShadow {
.offset_x = drop_shadow.offset_x.resolved(context).to_px(*this).to_double(),
.offset_y = drop_shadow.offset_y.resolved(context).to_px(*this).to_double(),
.radius = drop_shadow.radius.has_value() ? drop_shadow.radius->resolved(context).to_px(*this).to_double() : 0.0,
resolved_filter.append(Gfx::DropShadowFilter {
.offset_x = static_cast<float>(drop_shadow.offset_x.resolved(context).to_px(*this).to_double()),
.offset_y = static_cast<float>(drop_shadow.offset_y.resolved(context).to_px(*this).to_double()),
.radius = static_cast<float>(drop_shadow.radius.has_value() ? drop_shadow.radius->resolved(context).to_px(*this).to_double() : 0.0),
.color = drop_shadow.color.has_value() ? *drop_shadow.color : this->computed_values().color() });
},
[&](CSS::FilterOperation::Color const& color_operation) {
resolved_filter.filters.append(CSS::ResolvedFilter::Color {
resolved_filter.append(Gfx::ColorFilter {
.type = color_operation.operation,
.amount = color_operation.resolved_amount() });
},
[&](CSS::FilterOperation::HueRotate const& hue_rotate) {
resolved_filter.filters.append(CSS::ResolvedFilter::HueRotate { .angle_degrees = hue_rotate.angle_degrees(*this) });
resolved_filter.append(Gfx::HueRotateFilter { .angle_degrees = hue_rotate.angle_degrees(*this) });
});
}
return resolved_filter;