LibWeb: Make `absolutized_length()` helper a Length method

There were a mix of users between those who want to know if the Length
changed, and those that just want an absolute Length. So, we now have
two methods: Length::absolutize() returns an empty Optional if nothing
changed, and Length::absolutized() always returns a value.

Userland/Libraries/LibWeb/CSS/Length.cpp

@@ -193,4 +193,20 @@ Optional<Length::Type> Length::unit_from_name(StringView name)
     return {};
 }
 
+Optional<Length> Length::absolutize(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
+{
+    if (is_px())
+        return {};
+    if (is_absolute() || is_relative()) {
+        auto px = to_px(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
+        return CSS::Length::make_px(px);
+    }
+    return {};
+}
+
+Length Length::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
+{
+    return absolutize(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(*this);
+}
+
 }

Userland/Libraries/LibWeb/CSS/Length.h

@@ -125,6 +125,10 @@ public:
 
     CSSPixels relative_length_to_px(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const;
 
+    // Returns empty optional if it's already absolute.
+    Optional<Length> absolutize(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const;
+    Length absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const;
+
 private:
     char const* unit_name() const;
 

Userland/Libraries/LibWeb/CSS/StyleValue.cpp

@@ -1021,17 +1021,6 @@ CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcNumberSumPartW
     return value->resolve(layout_node, percentage_basis);
 }
 
-Optional<CSS::Length> absolutized_length(CSS::Length const& length, CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height)
-{
-    if (length.is_px())
-        return {};
-    if (length.is_absolute() || length.is_relative()) {
-        auto px = length.to_px(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
-        return CSS::Length::make_px(px);
-    }
-    return {};
-}
-
 ValueComparingNonnullRefPtr<StyleValue const> StyleValue::absolutized(CSSPixelRect const&, Gfx::FontPixelMetrics const&, CSSPixels, CSSPixels, CSSPixels, CSSPixels) const
 {
     return *this;

Userland/Libraries/LibWeb/CSS/StyleValue.h

@@ -90,8 +90,6 @@ private:
 
 using StyleValueVector = Vector<ValueComparingNonnullRefPtr<StyleValue const>>;
 
-Optional<CSS::Length> absolutized_length(CSS::Length const&, CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const&, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height);
-
 class StyleValue : public RefCounted<StyleValue> {
 public:
     virtual ~StyleValue() = default;

Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusStyleValue.cpp

@@ -25,9 +25,9 @@ ValueComparingNonnullRefPtr<StyleValue const> BorderRadiusStyleValue::absolutize
     auto absolutized_horizontal_radius = m_properties.horizontal_radius;
     auto absolutized_vertical_radius = m_properties.vertical_radius;
     if (!m_properties.horizontal_radius.is_percentage())
-        absolutized_horizontal_radius = absolutized_length(m_properties.horizontal_radius.length(), viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.horizontal_radius.length());
+        absolutized_horizontal_radius = m_properties.horizontal_radius.length().absolutized(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
     if (!m_properties.vertical_radius.is_percentage())
-        absolutized_vertical_radius = absolutized_length(m_properties.vertical_radius.length(), viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.vertical_radius.length());
+        absolutized_vertical_radius = m_properties.vertical_radius.length().absolutized(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
     return BorderRadiusStyleValue::create(absolutized_horizontal_radius, absolutized_vertical_radius);
 }
 

Userland/Libraries/LibWeb/CSS/StyleValues/LengthStyleValue.cpp

@@ -32,7 +32,7 @@ ValueComparingNonnullRefPtr<LengthStyleValue> LengthStyleValue::create(Length co
 
 ValueComparingNonnullRefPtr<StyleValue const> LengthStyleValue::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
 {
-    if (auto length = absolutized_length(m_length, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height); length.has_value())
+    if (auto length = m_length.absolutize(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height); length.has_value())
         return LengthStyleValue::create(length.release_value());
     return *this;
 }

Userland/Libraries/LibWeb/CSS/StyleValues/ShadowStyleValue.cpp

@@ -22,10 +22,10 @@ ErrorOr<String> ShadowStyleValue::to_string() const
 
 ValueComparingNonnullRefPtr<StyleValue const> ShadowStyleValue::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
 {
-    auto absolutized_offset_x = absolutized_length(m_properties.offset_x, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.offset_x);
-    auto absolutized_offset_y = absolutized_length(m_properties.offset_y, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.offset_y);
-    auto absolutized_blur_radius = absolutized_length(m_properties.blur_radius, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.blur_radius);
-    auto absolutized_spread_distance = absolutized_length(m_properties.spread_distance, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.spread_distance);
+    auto absolutized_offset_x = m_properties.offset_x.absolutized(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
+    auto absolutized_offset_y = m_properties.offset_y.absolutized(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
+    auto absolutized_blur_radius = m_properties.blur_radius.absolutized(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
+    auto absolutized_spread_distance = m_properties.spread_distance.absolutized(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
     return ShadowStyleValue::create(m_properties.color, absolutized_offset_x, absolutized_offset_y, absolutized_blur_radius, absolutized_spread_distance, m_properties.placement);
 }