impeller::FillPathGeometry Class Reference

A geometry that is created from a filled path object. More...

#include <fill_path_geometry.h>

Inheritance diagram for impeller::FillPathGeometry:

Public Member Functions
	FillPathGeometry (const Path &path, std::optional< Rect > inner_rect=std::nullopt)
	~FillPathGeometry ()=default
bool	CoversArea (const Matrix &transform, const Rect &rect) const override
	Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect.
Public Member Functions inherited from impeller::Geometry
virtual bool	IsAxisAlignedRect () const
virtual bool	CanApplyMaskFilter () const

Private Member Functions
GeometryResult	GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
std::optional< Rect >	GetCoverage (const Matrix &transform) const override
GeometryResult::Mode	GetResultMode () const override

Additional Inherited Members
Static Public Member Functions inherited from impeller::Geometry
static std::shared_ptr< Geometry >	MakeFillPath (const Path &path, std::optional< Rect > inner_rect=std::nullopt)
static std::shared_ptr< Geometry >	MakeStrokePath (const Path &path, Scalar stroke_width=0.0, Scalar miter_limit=4.0, Cap stroke_cap=Cap::kButt, Join stroke_join=Join::kMiter)
static std::shared_ptr< Geometry >	MakeCover ()
static std::shared_ptr< Geometry >	MakeRect (const Rect &rect)
static std::shared_ptr< Geometry >	MakeOval (const Rect &rect)
static std::shared_ptr< Geometry >	MakeLine (const Point &p0, const Point &p1, Scalar width, Cap cap)
static std::shared_ptr< Geometry >	MakeCircle (const Point &center, Scalar radius)
static std::shared_ptr< Geometry >	MakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)
static std::shared_ptr< Geometry >	MakeRoundRect (const Rect &rect, const Size &radii)
static std::shared_ptr< Geometry >	MakePointField (std::vector< Point > points, Scalar radius, bool round)
Static Protected Member Functions inherited from impeller::Geometry
static GeometryResult	ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)

Detailed Description

A geometry that is created from a filled path object.

Definition at line 16 of file fill_path_geometry.h.

Constructor & Destructor Documentation

FillPathGeometry()

impeller::FillPathGeometry::FillPathGeometry ( const Path &  path, std::optional< Rect >  inner_rect = std::nullopt  )

explicit

Definition at line 15 of file fill_path_geometry.cc.

    : path_(path), inner_rect_(inner_rect) {}

~FillPathGeometry()

impeller::FillPathGeometry::~FillPathGeometry ( )

default

Member Function Documentation

CoversArea()

bool impeller::FillPathGeometry::CoversArea ( const Matrix &  transform, const Rect &  rect  ) const

overridevirtual

Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect.

This is a conservative estimate useful for certain optimizations.

Returns

true if the transformed geometry is guaranteed to cover the given rect. May return false in many undetected cases where the transformed geometry does in fact cover the rect.

Reimplemented from impeller::Geometry.

Definition at line 79 of file fill_path_geometry.cc.

                                                          {
  if (!inner_rect_.has_value()) {
    return false;
  }
  if (!transform.IsTranslationScaleOnly()) {
    return false;
  }
  Rect coverage = inner_rect_->TransformBounds(transform);
  return coverage.Contains(rect);
}

GetCoverage()

std::optional< Rect > impeller::FillPathGeometry::GetCoverage ( const Matrix &  transform ) const

overrideprivatevirtual

Implements impeller::Geometry.

Definition at line 74 of file fill_path_geometry.cc.

                                   {
  return path_.GetTransformedBoundingBox(transform);
}

GetPositionBuffer()

GeometryResult impeller::FillPathGeometry::GetPositionBuffer ( const ContentContext &  renderer, const Entity &  entity, RenderPass &  pass  ) const

overrideprivatevirtual

Implements impeller::Geometry.

Definition at line 19 of file fill_path_geometry.cc.

                            {
  auto& host_buffer = renderer.GetTransientsBuffer();
 
  const auto& bounding_box = path_.GetBoundingBox();
  if (bounding_box.has_value() && bounding_box->IsEmpty()) {
    return GeometryResult{
        .type = PrimitiveType::kTriangle,
        .vertex_buffer =
            VertexBuffer{
                .vertex_buffer = {},
                .vertex_count = 0,
                .index_type = IndexType::k16bit,
            },
        .transform = pass.GetOrthographicTransform() * entity.GetTransform(),
    };
  }
 
  VertexBuffer vertex_buffer;
 
  auto points = renderer.GetTessellator()->TessellateConvex(
      path_, entity.GetTransform().GetMaxBasisLength());
 
  vertex_buffer.vertex_buffer = host_buffer.Emplace(
      points.data(), points.size() * sizeof(Point), alignof(Point));
  vertex_buffer.index_buffer = {}, vertex_buffer.vertex_count = points.size();
  vertex_buffer.index_type = IndexType::kNone;
 
  return GeometryResult{
      .type = PrimitiveType::kTriangleStrip,
      .vertex_buffer = vertex_buffer,
      .transform = entity.GetShaderTransform(pass),
      .mode = GetResultMode(),
  };
}

GetResultMode()

GeometryResult::Mode impeller::FillPathGeometry::GetResultMode ( ) const

overrideprivatevirtual

Reimplemented from impeller::Geometry.

Definition at line 57 of file fill_path_geometry.cc.

                                                         {
  const auto& bounding_box = path_.GetBoundingBox();
  if (path_.IsConvex() ||
      (bounding_box.has_value() && bounding_box->IsEmpty())) {
    return GeometryResult::Mode::kNormal;
  }
 
  switch (path_.GetFillType()) {
    case FillType::kNonZero:
      return GeometryResult::Mode::kNonZero;
    case FillType::kOdd:
      return GeometryResult::Mode::kEvenOdd;
  }
 
  FML_UNREACHABLE();
}

---

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

• impeller/entity/geometry/fill_path_geometry.h
• impeller/entity/geometry/fill_path_geometry.cc