A vertex writer that generates a triangle strip and requires primitive restart. More...

#include <path_component.h>

Inheritance diagram for impeller::StripVertexWriter:

Public Member Functions
	StripVertexWriter (Point point_buffer, uint16_t index_buffer)

	~StripVertexWriter ()

size_t	GetIndexCount () const

void	EndContour () override

void	Write (Point point) override

Detailed Description

A vertex writer that generates a triangle strip and requires primitive restart.

Definition at line 51 of file path_component.h.

Constructor & Destructor Documentation

◆ StripVertexWriter()

impeller::StripVertexWriter::StripVertexWriter	(	Point *	point_buffer,
		uint16_t *	index_buffer
	)

explicit

Definition at line 41 of file path_component.cc.

43 : point_buffer_(point_buffer), index_buffer_(index_buffer) {}

◆ ~StripVertexWriter()

impeller::StripVertexWriter::~StripVertexWriter ( )

default

Member Function Documentation

◆ EndContour()

void impeller::StripVertexWriter::EndContour ( )

overridevirtual

Implements impeller::VertexWriter.

Definition at line 51 of file path_component.cc.

                                    {
   if (count_ == 0u || contour_start_ == count_ - 1) {
     // Empty or first contour.
     return;
   }
  
   size_t start = contour_start_;
   size_t end = count_ - 1;
  
   index_buffer_[index_count_++] = start;
  
   size_t a = start + 1;
   size_t b = end;
   while (a < b) {
     index_buffer_[index_count_++] = a;
     index_buffer_[index_count_++] = b;
     a++;
     b--;
   }
   if (a == b) {
     index_buffer_[index_count_++] = a;
   }
  
   contour_start_ = count_;
   index_buffer_[index_count_++] = 0xFFFF;
 }

References impeller::saturated::b.

◆ GetIndexCount()

size_t impeller::StripVertexWriter::GetIndexCount ( ) const

Definition at line 47 of file path_component.cc.

                                               {
   return index_count_;
 }

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

◆ Write()

void impeller::StripVertexWriter::Write ( Point point )