impeller::DlVerticesGeometry Class Reference

A geometry that is created from a DlVertices object. More...

#include <dl_vertices_geometry.h>

Inheritance diagram for impeller::DlVerticesGeometry:

Public Member Functions
	DlVerticesGeometry (const std::shared_ptr< const flutter::DlVertices > &vertices, const ContentContext &renderer)
	~DlVerticesGeometry ()=default
GeometryResult	GetPositionUVColorBuffer (Rect texture_coverage, Matrix effect_transform, const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
GeometryResult	GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
std::optional< Rect >	GetCoverage (const Matrix &transform) const override
bool	HasVertexColors () const override
bool	HasTextureCoordinates () const override
std::optional< Rect >	GetTextureCoordinateCoverage () const override
Public Member Functions inherited from impeller::Geometry
virtual	~Geometry ()
virtual GeometryResult::Mode	GetResultMode () const
virtual bool	CoversArea (const Matrix &transform, const Rect &rect) const
	Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect. More...
virtual bool	IsAxisAlignedRect () const
virtual bool	CanApplyMaskFilter () const
virtual Scalar	ComputeAlphaCoverage (const Matrix &transform) const

Additional Inherited Members
Static Public Member Functions inherited from impeller::Geometry
static std::unique_ptr< Geometry >	MakeFillPath (const Path &path, std::optional< Rect > inner_rect=std::nullopt)
static std::unique_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::unique_ptr< Geometry >	MakeCover ()
static std::unique_ptr< Geometry >	MakeRect (const Rect &rect)
static std::unique_ptr< Geometry >	MakeOval (const Rect &rect)
static std::unique_ptr< Geometry >	MakeLine (const Point &p0, const Point &p1, Scalar width, Cap cap)
static std::unique_ptr< Geometry >	MakeCircle (const Point &center, Scalar radius)
static std::unique_ptr< Geometry >	MakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)
static std::unique_ptr< Geometry >	MakeRoundRect (const Rect &rect, const Size &radii)
static std::unique_ptr< Geometry >	MakeRoundSuperellipse (const Rect &rect, Scalar corner_radius)
static Scalar	ComputeStrokeAlphaCoverage (const Matrix &entity, Scalar stroke_width)
	Compute an alpha value to simulate lower coverage of fractional pixel strokes. More...
static GeometryResult	ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)

Detailed Description

A geometry that is created from a DlVertices object.

Definition at line 15 of file dl_vertices_geometry.h.

Constructor & Destructor Documentation

DlVerticesGeometry()

impeller::DlVerticesGeometry::DlVerticesGeometry	(	const std::shared_ptr< const flutter::DlVertices > &	vertices,
		const ContentContext &	renderer
	)

Definition at line 60 of file dl_vertices_geometry.cc.

    : vertices_(vertices) {
  performed_normalization_ = MaybePerformIndexNormalization(renderer);
  bounds_ = vertices_->GetBounds();
}

~DlVerticesGeometry()

impeller::DlVerticesGeometry::~DlVerticesGeometry ( )

default

Member Function Documentation

GetCoverage()

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

overridevirtual

Implements impeller::Geometry.

Definition at line 208 of file dl_vertices_geometry.cc.

                                   {
  return bounds_.TransformBounds(transform);
}

References transform, and impeller::TRect< T >::TransformBounds().

GetPositionBuffer()

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

overridevirtual

Implements impeller::Geometry.

Definition at line 115 of file dl_vertices_geometry.cc.

                            {
  int vertex_count = vertices_->vertex_count();
  BufferView vertex_buffer = renderer.GetTransientsBuffer().Emplace(
      vertices_->vertex_data(), vertex_count * sizeof(Point), alignof(Point));
 
  BufferView index_buffer = {};
  auto index_count =
      performed_normalization_ ? indices_.size() : vertices_->index_count();
  const uint16_t* indices_data =
      performed_normalization_ ? indices_.data() : vertices_->indices();
  if (index_count) {
    index_buffer = renderer.GetTransientsBuffer().Emplace(
        indices_data, index_count * sizeof(uint16_t), alignof(uint16_t));
  }
 
  return GeometryResult{
      .type = GetPrimitiveType(),
      .vertex_buffer =
          {
              .vertex_buffer = vertex_buffer,
              .index_buffer = index_buffer,
              .vertex_count = index_count > 0 ? index_count : vertex_count,
              .index_type =
                  index_count > 0 ? IndexType::k16bit : IndexType::kNone,
          },
      .transform = entity.GetShaderTransform(pass),
  };
}

References impeller::HostBuffer::Emplace(), impeller::Entity::GetShaderTransform(), impeller::ContentContext::GetTransientsBuffer(), impeller::k16bit, impeller::kNone, and impeller::GeometryResult::type.

GetPositionUVColorBuffer()

GeometryResult impeller::DlVerticesGeometry::GetPositionUVColorBuffer ( Rect  texture_coverage, Matrix  effect_transform, const ContentContext &  renderer, const Entity &  entity, RenderPass &  pass  ) const

overridevirtual

Implements impeller::VerticesGeometry.

Definition at line 147 of file dl_vertices_geometry.cc.

                            {
  using VS = PorterDuffBlendPipeline::VertexShader;
 
  int vertex_count = vertices_->vertex_count();
  Matrix uv_transform =
      texture_coverage.GetNormalizingTransform() * effect_transform;
  bool has_texture_coordinates = HasTextureCoordinates();
  bool has_colors = HasVertexColors();
 
  const Point* coordinates = has_texture_coordinates
                                 ? vertices_->texture_coordinate_data()
                                 : vertices_->vertex_data();
  BufferView vertex_buffer = renderer.GetTransientsBuffer().Emplace(
      vertex_count * sizeof(VS::PerVertexData), alignof(VS::PerVertexData),
      [&](uint8_t* data) {
        VS::PerVertexData* vtx_contents =
            reinterpret_cast<VS::PerVertexData*>(data);
        const Point* vertex_points = vertices_->vertex_data();
        for (auto i = 0; i < vertex_count; i++) {
          Point texture_coord = coordinates[i];
          Point uv = uv_transform * texture_coord;
          Color color = has_colors
                            ? skia_conversions::ToColor(vertices_->colors()[i])
                                  .Premultiply()
                            : Color::BlackTransparent();
          VS::PerVertexData vertex_data = {.vertices = vertex_points[i],
                                           .texture_coords = uv,
                                           .color = color};
          vtx_contents[i] = vertex_data;
        }
      });
 
  BufferView index_buffer = {};
  auto index_count =
      performed_normalization_ ? indices_.size() : vertices_->index_count();
  const uint16_t* indices_data =
      performed_normalization_ ? indices_.data() : vertices_->indices();
  if (index_count) {
    index_buffer = renderer.GetTransientsBuffer().Emplace(
        indices_data, index_count * sizeof(uint16_t), alignof(uint16_t));
  }
 
  return GeometryResult{
      .type = GetPrimitiveType(),
      .vertex_buffer =
          {
              .vertex_buffer = vertex_buffer,
              .index_buffer = index_buffer,
              .vertex_count = index_count > 0 ? index_count : vertex_count,
              .index_type =
                  index_count > 0 ? IndexType::k16bit : IndexType::kNone,
          },
      .transform = entity.GetShaderTransform(pass),
  };
}

References impeller::Color::BlackTransparent(), data, impeller::HostBuffer::Emplace(), impeller::TRect< T >::GetNormalizingTransform(), impeller::Entity::GetShaderTransform(), impeller::ContentContext::GetTransientsBuffer(), HasTextureCoordinates(), HasVertexColors(), impeller::k16bit, impeller::kNone, impeller::Color::Premultiply(), impeller::skia_conversions::ToColor(), and impeller::GeometryResult::type.

GetTextureCoordinateCoverage()

std::optional< Rect > impeller::DlVerticesGeometry::GetTextureCoordinateCoverage ( ) const

overridevirtual

Implements impeller::VerticesGeometry.

Definition at line 91 of file dl_vertices_geometry.cc.

                                                                         {
  if (!HasTextureCoordinates()) {
    return std::nullopt;
  }
  auto vertex_count = vertices_->vertex_count();
  if (vertex_count == 0) {
    return std::nullopt;
  }
 
  auto first = vertices_->texture_coordinate_data();
  auto left = first->x;
  auto top = first->y;
  auto right = first->x;
  auto bottom = first->y;
  int i = 1;
  for (auto it = first + 1; i < vertex_count; ++it, i++) {
    left = std::min(left, it->x);
    top = std::min(top, it->y);
    right = std::max(right, it->x);
    bottom = std::max(bottom, it->y);
  }
  return Rect::MakeLTRB(left, top, right, bottom);
}

References HasTextureCoordinates(), and impeller::TRect< Scalar >::MakeLTRB().

HasTextureCoordinates()

bool impeller::DlVerticesGeometry::HasTextureCoordinates ( ) const

overridevirtual

Implements impeller::VerticesGeometry.

Definition at line 87 of file dl_vertices_geometry.cc.

                                                     {
  return vertices_->texture_coordinate_data() != nullptr;
}

Referenced by GetPositionUVColorBuffer(), and GetTextureCoordinateCoverage().

HasVertexColors()

bool impeller::DlVerticesGeometry::HasVertexColors ( ) const

overridevirtual

Implements impeller::VerticesGeometry.

Definition at line 83 of file dl_vertices_geometry.cc.

                                               {
  return vertices_->colors() != nullptr;
}

Referenced by GetPositionUVColorBuffer().

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

• impeller/display_list/dl_vertices_geometry.h
• impeller/display_list/dl_vertices_geometry.cc