LibWeb/CSS: Introduce a base class for LCH-based color values

This will be used by both CSSLCH and CSSOKLCH.

Meta/gn/secondary/Userland/Libraries/LibWeb/CSS/StyleValues/BUILD.gn

@@ -12,9 +12,9 @@ source_set("StyleValues") {
     "CSSHSL.cpp",
     "CSSHWB.cpp",
     "CSSKeywordValue.cpp",
+    "CSSLCHLike.cpp",
     "CSSLabLike.cpp",
     "CSSMathValue.cpp",
-    "CSSOKLCH.cpp",
     "CSSRGB.cpp",
     "ConicGradientStyleValue.cpp",
     "ContentStyleValue.cpp",

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -121,8 +121,8 @@ set(SOURCES
     CSS/StyleValues/CSSHWB.cpp
     CSS/StyleValues/CSSKeywordValue.cpp
     CSS/StyleValues/CSSLabLike.cpp
+    CSS/StyleValues/CSSLCHLike.cpp
     CSS/StyleValues/CSSMathValue.cpp
-    CSS/StyleValues/CSSOKLCH.cpp
     CSS/StyleValues/CSSRGB.cpp
     CSS/StyleValues/DisplayStyleValue.cpp
     CSS/StyleValues/EasingStyleValue.cpp

Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -49,8 +49,8 @@
 #include <LibWeb/CSS/StyleValues/CSSHSL.h>
 #include <LibWeb/CSS/StyleValues/CSSHWB.h>
 #include <LibWeb/CSS/StyleValues/CSSKeywordValue.h>
+#include <LibWeb/CSS/StyleValues/CSSLCHLike.h>
 #include <LibWeb/CSS/StyleValues/CSSLabLike.h>
-#include <LibWeb/CSS/StyleValues/CSSOKLCH.h>
 #include <LibWeb/CSS/StyleValues/CSSRGB.h>
 #include <LibWeb/CSS/StyleValues/ContentStyleValue.h>
 #include <LibWeb/CSS/StyleValues/CounterDefinitionsStyleValue.h>
@@ -3399,7 +3399,7 @@ RefPtr<CSSStyleValue> Parser::parse_oklch_color_value(TokenStream<ComponentValue
 
     auto& color_values = *maybe_color_values;
 
-    return CSSOKLCH::create(color_values[0].release_nonnull(),
+    return CSSLCHLike::create<CSSOKLCH>(color_values[0].release_nonnull(),
         color_values[1].release_nonnull(),
         color_values[2].release_nonnull(),
         color_values[3].release_nonnull());

Userland/Libraries/LibWeb/CSS/StyleValues/CSSOKLCH.cpp → Userland/Libraries/LibWeb/CSS/StyleValues/CSSLCHLike.cpp

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include "CSSOKLCH.h"
+#include "CSSLCHLike.h"
 #include <AK/Math.h>
 #include <AK/TypeCasts.h>
 #include <LibWeb/CSS/Serialize.h>
@@ -14,6 +14,17 @@
 
 namespace Web::CSS {
 
+bool CSSLCHLike::equals(CSSStyleValue const& other) const
+{
+    if (type() != other.type())
+        return false;
+    auto const& other_color = other.as_color();
+    if (color_type() != other_color.color_type())
+        return false;
+    auto const& other_oklch_like = verify_cast<CSSLCHLike>(other_color);
+    return m_properties == other_oklch_like.m_properties;
+}
+
 Color CSSOKLCH::to_color(Optional<Layout::NodeWithStyle const&>) const
 {
     auto const l_val = clamp(resolve_with_reference_value(m_properties.l, 1.0).value_or(0), 0, 1);
@@ -24,17 +35,6 @@ Color CSSOKLCH::to_color(Optional<Layout::NodeWithStyle const&>) const
     return Color::from_oklab(l_val, c_val * cos(h_val), c_val * sin(h_val), alpha_val);
 }
 
-bool CSSOKLCH::equals(CSSStyleValue const& other) const
-{
-    if (type() != other.type())
-        return false;
-    auto const& other_color = other.as_color();
-    if (color_type() != other_color.color_type())
-        return false;
-    auto const& other_oklch = verify_cast<CSSOKLCH>(other_color);
-    return m_properties == other_oklch.m_properties;
-}
-
 // https://www.w3.org/TR/css-color-4/#serializing-oklab-oklch
 String CSSOKLCH::to_string() const
 {

Userland/Libraries/LibWeb/CSS/StyleValues/CSSOKLCH.h → Userland/Libraries/LibWeb/CSS/StyleValues/CSSLCHLike.h

@@ -11,33 +11,29 @@
 
 namespace Web::CSS {
 
-// https://drafts.css-houdini.org/css-typed-om-1/#cssoklch
-class CSSOKLCH final : public CSSColorValue {
+class CSSLCHLike : public CSSColorValue {
 public:
+    template<DerivedFrom<CSSLCHLike> T>
     static ValueComparingNonnullRefPtr<CSSOKLCH> create(ValueComparingNonnullRefPtr<CSSStyleValue> l, ValueComparingNonnullRefPtr<CSSStyleValue> c, ValueComparingNonnullRefPtr<CSSStyleValue> h, ValueComparingRefPtr<CSSStyleValue> alpha = {})
     {
         // alpha defaults to 1
         if (!alpha)
-            return adopt_ref(*new (nothrow) CSSOKLCH(move(l), move(c), move(h), NumberStyleValue::create(1)));
+            alpha = NumberStyleValue::create(1);
 
-        return adopt_ref(*new (nothrow) CSSOKLCH(move(l), move(c), move(h), alpha.release_nonnull()));
+        return adopt_ref(*new (nothrow) T({}, move(l), move(c), move(h), alpha.release_nonnull()));
     }
-    virtual ~CSSOKLCH() override = default;
+    virtual ~CSSLCHLike() override = default;
 
     CSSStyleValue const& l() const { return *m_properties.l; }
     CSSStyleValue const& c() const { return *m_properties.c; }
     CSSStyleValue const& h() const { return *m_properties.h; }
     CSSStyleValue const& alpha() const { return *m_properties.alpha; }
 
-    virtual Color to_color(Optional<Layout::NodeWithStyle const&>) const override;
-
-    String to_string() const override;
-
     virtual bool equals(CSSStyleValue const& other) const override;
 
-private:
-    CSSOKLCH(ValueComparingNonnullRefPtr<CSSStyleValue> l, ValueComparingNonnullRefPtr<CSSStyleValue> c, ValueComparingNonnullRefPtr<CSSStyleValue> h, ValueComparingNonnullRefPtr<CSSStyleValue> alpha)
-        : CSSColorValue(ColorType::OKLCH)
+protected:
+    CSSLCHLike(ColorType color_type, ValueComparingNonnullRefPtr<CSSStyleValue> l, ValueComparingNonnullRefPtr<CSSStyleValue> c, ValueComparingNonnullRefPtr<CSSStyleValue> h, ValueComparingNonnullRefPtr<CSSStyleValue> alpha)
+        : CSSColorValue(color_type)
         , m_properties { .l = move(l), .c = move(c), .h = move(h), .alpha = move(alpha) }
     {
     }
@@ -51,4 +47,18 @@ private:
     } m_properties;
 };
 
+// https://drafts.css-houdini.org/css-typed-om-1/#cssoklch
+class CSSOKLCH final : public CSSLCHLike {
+public:
+    CSSOKLCH(Badge<CSSLCHLike>, ValueComparingNonnullRefPtr<CSSStyleValue> l, ValueComparingNonnullRefPtr<CSSStyleValue> c, ValueComparingNonnullRefPtr<CSSStyleValue> h, ValueComparingNonnullRefPtr<CSSStyleValue> alpha)
+        : CSSLCHLike(ColorType::OKLCH, move(l), move(c), move(h), move(alpha))
+    {
+    }
+    virtual ~CSSOKLCH() override = default;
+
+    virtual Color to_color(Optional<Layout::NodeWithStyle const&>) const override;
+
+    String to_string() const override;
+};
+
 }