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
bool	CanApplyMaskFilter () 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.
virtual bool	IsAxisAlignedRect () 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 flutter::DlPath &path, std::optional< Rect > inner_rect=std::nullopt)
static std::unique_ptr< Geometry >	MakeStrokePath (const flutter::DlPath &path, const StrokeParameters &stroke={})
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, const StrokeParameters &stroke)
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 >	MakeFilledArc (const Rect &oval_bounds, Degrees start, Degrees sweep, bool include_center)
static std::unique_ptr< Geometry >	MakeStrokedArc (const Rect &oval_bounds, Degrees start, Degrees sweep, const StrokeParameters &stroke)
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.
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

CanApplyMaskFilter()

bool impeller::DlVerticesGeometry::CanApplyMaskFilter ( ) const

overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 224 of file dl_vertices_geometry.cc.

                                                  {
  return false;
}

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.GetTransientsDataBuffer().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.GetTransientsIndexesBuffer().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::GetTransientsDataBuffer(), impeller::ContentContext::GetTransientsIndexesBuffer(), 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.GetTransientsDataBuffer().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.GetTransientsIndexesBuffer().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::GetTransientsDataBuffer(), impeller::ContentContext::GetTransientsIndexesBuffer(), HasTextureCoordinates(), HasVertexColors(), i, 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(), i, 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