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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_SHAPE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_SHAPE_H_
#include <cstddef>
#include <optional>
#include <variant>
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/core/style/basic_shapes.h"
#include "third_party/blink/renderer/core/svg/svg_path_data.h"
#include "third_party/blink/renderer/platform/geometry/length_point.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
#include "ui/gfx/geometry/rect_f.h"
namespace blink {
// The computed version of the shape() function
// https://drafts.csswg.org/css-shapes-2/#shape-function
// It stores each shape segment as a struct with the appropriate Length or enum
// values.
class StyleShape final : public BasicShape {
public:
using CloseSegment = std::monostate;
template <SVGPathSegType Type>
struct SegmentWithTargetPoint {
static constexpr SVGPathSegType kSegType = Type;
LengthPoint target_point;
bool operator==(const SegmentWithTargetPoint& other) const = default;
};
struct MoveToSegment
: public SegmentWithTargetPoint<SVGPathSegType::kPathSegMoveToAbs> {};
struct MoveBySegment
: public SegmentWithTargetPoint<SVGPathSegType::kPathSegMoveToRel> {};
struct LineToSegment
: public SegmentWithTargetPoint<SVGPathSegType::kPathSegLineToAbs> {};
struct LineBySegment
: public SegmentWithTargetPoint<SVGPathSegType::kPathSegLineToRel> {};
struct HLineSegment {
Length x;
bool operator==(const HLineSegment& other) const = default;
};
struct HLineToSegment : public HLineSegment {
static constexpr SVGPathSegType kSegType =
SVGPathSegType::kPathSegLineToHorizontalAbs;
};
struct HLineBySegment : public HLineSegment {
static constexpr SVGPathSegType kSegType =
SVGPathSegType::kPathSegLineToHorizontalRel;
};
struct VLineSegment {
Length y;
bool operator==(const VLineSegment& other) const = default;
};
struct VLineToSegment : public VLineSegment {
static constexpr SVGPathSegType kSegType =
SVGPathSegType::kPathSegLineToVerticalAbs;
};
struct VLineBySegment : public VLineSegment {
static constexpr SVGPathSegType kSegType =
SVGPathSegType::kPathSegLineToVerticalRel;
};
struct ControlPoint {
enum class Origin { kSegmentStart, kSegmentEnd, kReferenceBox };
Origin origin;
LengthPoint point;
bool operator==(const ControlPoint& other) const = default;
};
template <size_t NumControlPoints, SVGPathSegType Type>
struct CurveSegment : SegmentWithTargetPoint<Type> {
static constexpr size_t GetNumControlPoints() { return NumControlPoints; }
std::array<ControlPoint, NumControlPoints> control_points;
bool operator==(const CurveSegment<NumControlPoints, Type>& other) const =
default;
};
struct CubicCurveToSegment
: public CurveSegment<2, SVGPathSegType::kPathSegCurveToCubicAbs> {};
struct CubicCurveBySegment
: public CurveSegment<2, SVGPathSegType::kPathSegCurveToCubicRel> {};
struct QuadraticCurveToSegment
: public CurveSegment<1, SVGPathSegType::kPathSegCurveToQuadraticAbs> {};
struct QuadraticCurveBySegment
: public CurveSegment<1, SVGPathSegType::kPathSegCurveToQuadraticRel> {};
struct SmoothCubicCurveToSegment
: public CurveSegment<1, SVGPathSegType::kPathSegCurveToCubicSmoothAbs> {
};
struct SmoothCubicCurveBySegment
: public CurveSegment<1, SVGPathSegType::kPathSegCurveToCubicSmoothRel> {
};
struct SmoothQuadraticCurveToSegment
: public SegmentWithTargetPoint<
SVGPathSegType::kPathSegCurveToQuadraticSmoothAbs> {};
struct SmoothQuadraticCurveBySegment
: public SegmentWithTargetPoint<
SVGPathSegType::kPathSegCurveToQuadraticSmoothRel> {};
template <SVGPathSegType Type>
struct ArcSegment : public SegmentWithTargetPoint<Type> {
double angle;
LengthSize radius;
Length direction_agnostic_radius;
bool large;
bool sweep;
bool operator==(const ArcSegment& other) const = default;
};
struct ArcToSegment : public ArcSegment<SVGPathSegType::kPathSegArcAbs> {};
struct ArcBySegment : public ArcSegment<SVGPathSegType::kPathSegArcRel> {};
using Segment = std::variant<MoveToSegment,
MoveBySegment,
LineToSegment,
LineBySegment,
HLineToSegment,
HLineBySegment,
VLineToSegment,
VLineBySegment,
CubicCurveToSegment,
CubicCurveBySegment,
QuadraticCurveToSegment,
QuadraticCurveBySegment,
SmoothCubicCurveToSegment,
SmoothCubicCurveBySegment,
SmoothQuadraticCurveToSegment,
SmoothQuadraticCurveBySegment,
ArcToSegment,
ArcBySegment,
CloseSegment>;
StyleShape(WindRule wind_rule,
const LengthPoint& origin,
Vector<Segment> segments);
ShapeType GetType() const override { return kStyleShapeType; }
Path GetPath(const gfx::RectF& bounding_box,
float zoom,
float path_scale) const override;
WindRule GetWindRule() const { return wind_rule_; }
const LengthPoint& GetOrigin() const { return origin_; }
const Vector<Segment>& Segments() const { return segments_; }
protected:
bool IsEqualAssumingSameType(const BasicShape&) const override;
private:
WindRule wind_rule_;
LengthPoint origin_;
Vector<Segment> segments_;
};
template <>
struct DowncastTraits<StyleShape> {
static bool AllowFrom(const BasicShape& value) {
return value.GetType() == BasicShape::kStyleShapeType;
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_SHAPE_H_
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