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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.
#include "third_party/blink/renderer/core/style/style_shape.h"
#include <numbers>
#include <variant>
#include "base/memory/stack_allocated.h"
#include "third_party/blink/renderer/core/svg/svg_path_builder.h"
#include "third_party/blink/renderer/core/svg/svg_path_data.h"
#include "third_party/blink/renderer/core/svg/svg_path_parser.h"
#include "third_party/blink/renderer/core/svg/svg_path_utilities.h"
#include "third_party/blink/renderer/platform/geometry/length_functions.h"
#include "third_party/blink/renderer/platform/geometry/length_point.h"
#include "third_party/blink/renderer/platform/geometry/path.h"
#include "third_party/blink/renderer/platform/geometry/path_types.h"
#include "third_party/blink/renderer/platform/transforms/affine_transform.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/vector2d_f.h"
namespace blink {
StyleShape::StyleShape(WindRule wind_rule,
const LengthPoint& origin,
Vector<Segment> segments)
: wind_rule_(wind_rule), origin_(origin), segments_(std::move(segments)) {}
bool StyleShape::IsEqualAssumingSameType(const BasicShape& o) const {
const StyleShape& other = To<StyleShape>(o);
return wind_rule_ == other.wind_rule_ && origin_ == other.origin_ &&
segments_ == other.segments_;
}
namespace {
class SegmentVisitor {
STACK_ALLOCATED();
public:
SegmentVisitor(SVGPathBuilder& path_builder, const gfx::SizeF& size)
: builder(path_builder), box_size(size) {}
template <typename T>
void operator()(const T& segment) {
Emit(segment, T::kSegType);
}
void operator()(const StyleShape::CloseSegment&) {
builder.EmitSegment({.command = SVGPathSegType::kPathSegClosePath});
}
private:
gfx::PointF PointForControlPoint(
const StyleShape::ControlPoint& control_point,
gfx::PointF start,
gfx::PointF end) const {
gfx::PointF point = PointForLengthPoint(control_point.point, box_size);
switch (control_point.origin) {
case StyleShape::ControlPoint::Origin::kReferenceBox:
return point;
case StyleShape::ControlPoint::Origin::kSegmentStart:
return point + start.OffsetFromOrigin();
case StyleShape::ControlPoint::Origin::kSegmentEnd:
return point + end.OffsetFromOrigin();
}
}
template <size_t NumControlPoints, SVGPathSegType T>
void Emit(const StyleShape::CurveSegment<NumControlPoints, T>& segment,
SVGPathSegType command) {
gfx::PointF segment_start = builder.CurrentPoint();
gfx::PointF target_point =
PointForLengthPoint(segment.target_point, box_size);
bool is_absolute = IsAbsolutePathSegType(command);
gfx::PointF segment_end =
is_absolute ? target_point
: (segment_start + target_point.OffsetFromOrigin());
gfx::PointF point1 = PointForControlPoint(segment.control_points.at(0),
segment_start, segment_end);
PathSegmentData data{.command = ToAbsolutePathSegType(command),
.target_point = segment_end};
if (T == SVGPathSegType::kPathSegCurveToCubicSmoothAbs ||
T == SVGPathSegType::kPathSegCurveToCubicSmoothRel) {
data.point2 = point1;
} else {
data.point1 = point1;
}
if (NumControlPoints == 2) {
data.point2 = PointForControlPoint(segment.control_points.at(1),
segment_start, segment_end);
}
builder.EmitSegment(data);
}
template <SVGPathSegType T>
void Emit(const StyleShape::SegmentWithTargetPoint<T>& segment,
SVGPathSegType command) {
builder.EmitSegment(
{.command = command,
.target_point = PointForLengthPoint(segment.target_point, box_size)});
}
void Emit(const StyleShape::HLineSegment& segment, SVGPathSegType command) {
builder.EmitSegment(
{.command = command,
.target_point = {FloatValueForLength(segment.x, box_size.width()),
0}});
}
void Emit(const StyleShape::VLineSegment& segment, SVGPathSegType command) {
builder.EmitSegment(
{.command = command,
.target_point = {0,
FloatValueForLength(segment.y, box_size.height())}});
}
template <SVGPathSegType T>
void Emit(const StyleShape::ArcSegment<T>& segment, SVGPathSegType command) {
PathSegmentData arc_data{
.command = command,
.target_point = PointForLengthPoint(segment.target_point, box_size),
.arc_sweep = segment.sweep,
.arc_large = segment.large};
// https://drafts.csswg.org/css-shapes-2/#direction-agnostic-size:
// The direction-agnostic size of a box is equal to the length of the
// diagonal of the box, divided by sqrt(2).
const float direction_agnostic_size = FloatValueForLength(
segment.direction_agnostic_radius,
std::hypot(box_size.width(), box_size.height()) / std::numbers::sqrt2);
arc_data.SetArcRadiusX(
FloatValueForLength(segment.radius.Width(), box_size.width()) +
direction_agnostic_size);
arc_data.SetArcRadiusY(
FloatValueForLength(segment.radius.Height(), box_size.height()) +
direction_agnostic_size);
arc_data.SetArcAngle(segment.angle);
builder.EmitSegment(arc_data);
}
SVGPathBuilder& builder;
const gfx::SizeF& box_size;
};
} // namespace
Path StyleShape::GetPath(const gfx::RectF& box_rect,
float /*zoom*/,
float path_scale) const {
SVGPathBuilder builder(GetWindRule());
builder.EmitSegment(
{.command = SVGPathSegType::kPathSegMoveToAbs,
.target_point = PointForLengthPoint(origin_, box_rect.size())});
SegmentVisitor visitor(builder, box_rect.size());
for (const Segment& segment : segments_) {
std::visit(visitor, segment);
}
// TODO(crbug.com/384870258): retain an LRU size->path cache.
const gfx::Vector2dF offset = box_rect.OffsetFromOrigin();
builder.Transform(
AffineTransform::Translation(offset.x(), offset.x()).Scale(path_scale));
return builder.Finalize();
}
} // namespace blink
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