#include <shadow_path_geometry.h>

Public Member Functions
	ShadowPathGeometry (Tessellator &tessellator, const Matrix &matrix, const PathSource &source, Scalar occluder_height)

bool	CanRender () const

bool	IsEmpty () const
	Returns true if this shadow has no effect, is not visible. More...

const std::shared_ptr< ShadowVertices > &	GetShadowVertices () const

const std::shared_ptr< ShadowVertices >	TakeShadowVertices ()

Static Public Member Functions
static std::shared_ptr< ShadowVertices >	MakeAmbientShadowVertices (Tessellator &tessellator, const PathSource &source, Scalar occluder_height, const Matrix &matrix)

Detailed Description

A class to compute and return the |ShadowVertices| for a path source viewed under a given transform. The |occluder_height| is measured in device pixels. The geometry of the |PathSource| is transformed by the indicated matrix to produce a device space set of vertices, and the shadow mesh is inset and outset by the indicated |occluder_height| without any adjustment for the matrix. The results are un-transformed and returned back iin the |ShadowVertices| in the original coordinate system.

Definition at line 80 of file shadow_path_geometry.h.

Constructor & Destructor Documentation

◆ ShadowPathGeometry()

impeller::ShadowPathGeometry::ShadowPathGeometry	(	Tessellator &	tessellator,
		const Matrix &	matrix,
		const PathSource &	source,
		Scalar	occluder_height
	)

Definition at line 1389 of file shadow_path_geometry.cc.

     : shadow_vertices_(MakeAmbientShadowVertices(tessellator,
                                                  source,
                                                  occluder_height,
                                                  matrix)) {}

Member Function Documentation

◆ CanRender()

bool impeller::ShadowPathGeometry::CanRender ( ) const

Definition at line 1398 of file shadow_path_geometry.cc.

                                          {
   return shadow_vertices_ != nullptr;
 }

◆ GetShadowVertices()

const std::shared_ptr< ShadowVertices > & impeller::ShadowPathGeometry::GetShadowVertices ( ) const

Returns a reference to the generated vertices, or null if the algorithm failed to produce a mesh.

Definition at line 1406 of file shadow_path_geometry.cc.

           {
   return shadow_vertices_;
 }

◆ IsEmpty()

bool impeller::ShadowPathGeometry::IsEmpty ( ) const

Returns true if this shadow has no effect, is not visible.

Definition at line 1402 of file shadow_path_geometry.cc.

                                        {
   return shadow_vertices_ != nullptr && shadow_vertices_->IsEmpty();
 }

◆ MakeAmbientShadowVertices()

std::shared_ptr< ShadowVertices > impeller::ShadowPathGeometry::MakeAmbientShadowVertices	(	Tessellator &	tessellator,
		const PathSource &	source,
		Scalar	occluder_height,
		const Matrix &	matrix
	)

static

Definition at line 1454 of file shadow_path_geometry.cc.

                           {
   Scalar trig_radius = PolygonInfo::GetTrigRadiusForHeight(occluder_height);
   Tessellator::Trigs trigs = tessellator.GetTrigsForDeviceRadius(trig_radius);
  
   PolygonInfo polygon(occluder_height);
  
   return polygon.CalculateConvexShadowMesh(source, matrix, trigs);
 }

References impeller::Tessellator::GetTrigsForDeviceRadius().

Referenced by impeller::BM_ShadowPathVerticesImpeller(), and impeller::testing::TEST().

◆ TakeShadowVertices()

const std::shared_ptr< ShadowVertices > impeller::ShadowPathGeometry::TakeShadowVertices ( )

Takes (returns the only copy of via std::move) the shadow vertices or null if the algorithm failed to produce a mesh.

Definition at line 1411 of file shadow_path_geometry.cc.

                                                                            {
   return std::move(shadow_vertices_);
 }

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

impeller/entity/geometry/shadow_path_geometry.h
impeller/entity/geometry/shadow_path_geometry.cc

Public Member Functions

Static Public Member Functions