LibWeb: Remove CalculatedStyleValue from Angle

...and replace it with AngleOrCalculated.

This has the nice bonus effect of actually handling `calc()` for angles
in a transform function. :^) (Previously we just would have asserted.)

Userland/Libraries/LibWeb/CSS/Angle.cpp

@@ -1,12 +1,12 @@
 /*
- * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include "Angle.h"
 #include <AK/Math.h>
-#include <LibWeb/CSS/StyleValue.h>
+#include <LibWeb/CSS/Percentage.h>
 
 namespace Web::CSS {
 
@@ -22,13 +22,6 @@ Angle::Angle(float value, Type type)
 {
 }
 
-Angle Angle::make_calculated(NonnullRefPtr<CalculatedStyleValue> calculated_style_value)
-{
-    Angle angle { 0, Type::Calculated };
-    angle.m_calculated_style = move(calculated_style_value);
-    return angle;
-}
-
 Angle Angle::make_degrees(float value)
 {
     return { value, Type::Deg };
@@ -36,23 +29,17 @@ Angle Angle::make_degrees(float value)
 
 Angle Angle::percentage_of(Percentage const& percentage) const
 {
-    VERIFY(!is_calculated());
-
     return Angle { percentage.as_fraction() * m_value, m_type };
 }
 
 ErrorOr<String> Angle::to_string() const
 {
-    if (is_calculated())
-        return m_calculated_style->to_string();
     return String::formatted("{}{}", m_value, unit_name());
 }
 
 float Angle::to_degrees() const
 {
     switch (m_type) {
-    case Type::Calculated:
-        return m_calculated_style->resolve_angle()->to_degrees();
     case Type::Deg:
         return m_value;
     case Type::Grad:
@@ -68,8 +55,6 @@ float Angle::to_degrees() const
 StringView Angle::unit_name() const
 {
     switch (m_type) {
-    case Type::Calculated:
-        return "calculated"sv;
     case Type::Deg:
         return "deg"sv;
     case Type::Grad:
@@ -99,10 +84,4 @@ Optional<Angle::Type> Angle::unit_from_name(StringView name)
     return {};
 }
 
-NonnullRefPtr<CalculatedStyleValue> Angle::calculated_style_value() const
-{
-    VERIFY(!m_calculated_style.is_null());
-    return *m_calculated_style;
-}
-
 }

Userland/Libraries/LibWeb/CSS/Angle.h

@@ -1,12 +1,11 @@
 /*
- * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #pragma once
 
-#include <AK/RefPtr.h>
 #include <AK/String.h>
 #include <LibWeb/Forward.h>
 
@@ -15,7 +14,6 @@ namespace Web::CSS {
 class Angle {
 public:
     enum class Type {
-        Calculated,
         Deg,
         Grad,
         Rad,
@@ -26,20 +24,14 @@ public:
 
     Angle(int value, Type type);
     Angle(float value, Type type);
-    static Angle make_calculated(NonnullRefPtr<CalculatedStyleValue>);
     static Angle make_degrees(float);
     Angle percentage_of(Percentage const&) const;
 
-    bool is_calculated() const { return m_type == Type::Calculated; }
-    NonnullRefPtr<CalculatedStyleValue> calculated_style_value() const;
-
     ErrorOr<String> to_string() const;
     float to_degrees() const;
 
     bool operator==(Angle const& other) const
     {
-        if (is_calculated())
-            return m_calculated_style == other.m_calculated_style;
         return m_type == other.m_type && m_value == other.m_value;
     }
 
@@ -48,7 +40,6 @@ private:
 
     Type m_type;
     float m_value { 0 };
-    RefPtr<CalculatedStyleValue> m_calculated_style;
 };
 
 }

Userland/Libraries/LibWeb/CSS/ComputedValues.h

@@ -105,7 +105,7 @@ public:
     float width { 0 };
 };
 
-using TransformValue = Variant<CSS::Angle, CSS::LengthPercentage, float>;
+using TransformValue = Variant<CSS::AngleOrCalculated, CSS::LengthPercentage, float>;
 
 struct Transformation {
     CSS::TransformFunction function;

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

@@ -20,6 +20,7 @@
 #include <LibWeb/CSS/CSSStyleRule.h>
 #include <LibWeb/CSS/CSSStyleSheet.h>
 #include <LibWeb/CSS/CSSSupportsRule.h>
+#include <LibWeb/CSS/CalculatedOr.h>
 #include <LibWeb/CSS/MediaList.h>
 #include <LibWeb/CSS/Parser/Block.h>
 #include <LibWeb/CSS/Parser/ComponentValue.h>
@@ -5780,7 +5781,7 @@ RefPtr<StyleValue> Parser::parse_transform_value(Vector<ComponentValue> const& c
             case TransformFunctionParameterType::Angle: {
                 // These are `<angle> | <zero>` in the spec, so we have to check for both kinds.
                 if (maybe_calc_value && maybe_calc_value->resolves_to_angle()) {
-                    values.append(AngleStyleValue::create(Angle::make_calculated(maybe_calc_value.release_nonnull())));
+                    values.append(maybe_calc_value.release_nonnull());
                 } else if (value.is(Token::Type::Number) && value.token().number_value() == 0) {
                     values.append(AngleStyleValue::create(Angle::make_degrees(0)));
                 } else {

Userland/Libraries/LibWeb/CSS/StyleValue.h

@@ -23,6 +23,7 @@
 #include <AK/WeakPtr.h>
 #include <LibGfx/Painter.h>
 #include <LibWeb/CSS/Angle.h>
+#include <LibWeb/CSS/CalculatedOr.h>
 #include <LibWeb/CSS/Enums.h>
 #include <LibWeb/CSS/Frequency.h>
 #include <LibWeb/CSS/Length.h>

Userland/Libraries/LibWeb/Painting/StackingContext.cpp

@@ -239,8 +239,8 @@ Gfx::FloatMatrix4x4 StackingContext::get_transformation_matrix(CSS::Transformati
 
                 return value.length().to_px(m_box).value();
             },
-            [](CSS::Angle const& value) {
+            [this](CSS::AngleOrCalculated const& value) {
-                return value.to_degrees() * static_cast<float>(M_DEG2RAD);
+                return value.resolved(m_box).to_degrees() * static_cast<float>(M_DEG2RAD);
             },
             [](float value) {
                 return value;