impeller::Path::Polyline Struct Reference

#include <path.h>

Public Types
using	PointBufferPtr = std::unique_ptr< std::vector< Point > >
using	ReclaimPointBufferCallback = std::function< void(PointBufferPtr)>

Public Member Functions
	Polyline (PointBufferPtr point_buffer, ReclaimPointBufferCallback reclaim)
	Polyline (Polyline &&other)
	~Polyline ()
Point &	GetPoint (size_t index) const
std::tuple< size_t, size_t >	GetContourPointBounds (size_t contour_index) const

Public Attributes
PointBufferPtr	points
std::vector< PolylineContour >	contours

Detailed Description

One or more contours represented as a series of points and indices in the point vector representing the start of a new contour.

Polylines are ephemeral and meant to be used by the tessellator. They do not allocate their own point vectors to allow for optimizations around allocation and reuse of arenas.

Definition at line 98 of file path.h.

Member Typedef Documentation

PointBufferPtr

using impeller::Path::Polyline::PointBufferPtr = std::unique_ptr<std::vector<Point> >

The signature of a method called when it is safe to reclaim the point buffer provided to the constructor of this object.

Definition at line 101 of file path.h.

ReclaimPointBufferCallback

using impeller::Path::Polyline::ReclaimPointBufferCallback = std::function<void(PointBufferPtr)>

Definition at line 102 of file path.h.

Constructor & Destructor Documentation

Polyline() [1/2]

impeller::Path::Polyline::Polyline	(	PointBufferPtr	point_buffer,
		ReclaimPointBufferCallback	reclaim
	)

The buffer will be cleared and returned at the destruction of this polyline.

Definition at line 234 of file path.cc.

    : points(std::move(point_buffer)), reclaim_points_(std::move(reclaim)) {
  FML_DCHECK(points);
}

References points.

Polyline() [2/2]

impeller::Path::Polyline::Polyline

(

Path::Polyline &&

other

)

Definition at line 240 of file path.cc.

                                           {
  points = std::move(other.points);
  reclaim_points_ = std::move(other.reclaim_points_);
  contours = std::move(other.contours);
}

~Polyline()

impeller::Path::Polyline::~Polyline

(

)

Definition at line 246 of file path.cc.

                        {
  if (reclaim_points_) {
    points->clear();
    reclaim_points_(std::move(points));
  }
}

Member Function Documentation

GetContourPointBounds()

std::tuple< size_t, size_t > impeller::Path::Polyline::GetContourPointBounds

(

size_t

contour_index

)

const

Convenience method to compute the start (inclusive) and end (exclusive) point of the given contour index.

The contour_index parameter is clamped to contours.size().

Definition at line 22 of file path.cc.

                                {
  if (contour_index >= contours.size()) {
    return {points->size(), points->size()};
  }
  const size_t start_index = contours.at(contour_index).start_index;
  const size_t end_index = (contour_index >= contours.size() - 1)
                               ? points->size()
                               : contours.at(contour_index + 1).start_index;
  return std::make_tuple(start_index, end_index);
}

References contours, and points.

Referenced by impeller::Tessellator::TessellateConvex(), and impeller::testing::TEST().

GetPoint()

Point& impeller::Path::Polyline::GetPoint ( size_t  index ) const

inline

Definition at line 115 of file path.h.

{ return (*points)[index]; }

References points.

Referenced by impeller::testing::TEST().

Member Data Documentation

contours

std::vector<PolylineContour> impeller::Path::Polyline::contours

Contours are disconnected pieces of a polyline, such as when a MoveTo was issued on a PathBuilder.

Definition at line 119 of file path.h.

Referenced by impeller::Path::CreatePolyline(), GetContourPointBounds(), and impeller::testing::TEST().

points

PointBufferPtr impeller::Path::Polyline::points

Points in the polyline, which may represent multiple contours specified by indices in |contours|.

Definition at line 113 of file path.h.

Referenced by impeller::Path::CreatePolyline(), GetContourPointBounds(), GetPoint(), Polyline(), and impeller::testing::TEST().

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The documentation for this struct was generated from the following files:

• impeller/geometry/path.h
• impeller/geometry/path.cc