impeller::CircleContents Class Reference

#include <circle_contents.h>

Inheritance diagram for impeller::CircleContents:

Public Member Functions
bool	Render (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
std::optional< Rect >	GetCoverage (const Entity &entity) const override
	Get the area of the render pass that will be affected when this contents is rendered.
Public Member Functions inherited from impeller::ColorSourceContents
	ColorSourceContents ()
	~ColorSourceContents () override
void	SetGeometry (const Geometry *geometry)
	Set the geometry that this contents will use to render.
const Geometry *	GetGeometry () const
	Get the geometry that this contents will use to render.
void	SetEffectTransform (Matrix matrix)
	Set the effect transform for this color source.
const Matrix &	GetInverseEffectTransform () const
	Set the inverted effect transform for this color source.
void	SetOpacityFactor (Scalar opacity)
	Set the opacity factor for this color source.
Scalar	GetOpacityFactor () const
	Get the opacity factor for this color source.
virtual bool	IsSolidColor () const
std::optional< Rect >	GetCoverage (const Entity &entity) const override
	Get the area of the render pass that will be affected when this contents is rendered.
void	SetInheritedOpacity (Scalar opacity) override
	Inherit the provided opacity.
Public Member Functions inherited from impeller::Contents
	Contents ()
virtual	~Contents ()
void	SetCoverageHint (std::optional< Rect > coverage_hint)
	Hint that specifies the coverage area of this Contents that will actually be used during rendering. This is for optimization purposes only and can not be relied on as a clip. May optionally affect the result of GetCoverage().
const std::optional< Rect > &	GetCoverageHint () const
virtual bool	IsOpaque (const Matrix &transform) const
	Whether this Contents only emits opaque source colors from the fragment stage. This value does not account for any entity properties (e.g. the blend mode), clips/visibility culling, or inherited opacity.
virtual std::optional< Snapshot >	RenderToSnapshot (const ContentContext &renderer, const Entity &entity, const SnapshotOptions &options) const
	Render this contents to a snapshot, respecting the entity's transform, path, clip depth, and blend mode. The result texture size is always the size of GetCoverage(entity).
std::optional< Size >	GetColorSourceSize () const
	Return the color source's intrinsic size, if available.
void	SetColorSourceSize (Size size)
virtual std::optional< Color >	AsBackgroundColor (const Entity &entity, ISize target_size) const
	Returns a color if this Contents will flood the given target_size with a color. This output color is the "Source" color that will be used for the Entity's blend operation.
virtual bool	ApplyColorFilter (const ColorFilterProc &color_filter_proc)
	If possible, applies a color filter to this contents inputs on the CPU.

Static Public Member Functions
static std::unique_ptr< CircleContents >	Make (std::unique_ptr< CircleGeometry > geometry, Color color, bool stroked)
Static Public Member Functions inherited from impeller::ColorSourceContents
template<typename VertexShaderT >
static bool	DrawGeometry (const Contents *contents, const Geometry *geometry, const ContentContext &renderer, const Entity &entity, RenderPass &pass, const PipelineBuilderCallback &pipeline_callback, typename VertexShaderT::FrameInfo frame_info, const BindFragmentCallback &bind_fragment_callback, bool force_stencil=false, const CreateGeometryCallback &create_geom_callback=DefaultCreateGeometryCallback)
Static Public Member Functions inherited from impeller::Contents
static std::shared_ptr< Contents >	MakeAnonymous (RenderProc render_proc, CoverageProc coverage_proc)

Additional Inherited Members
Public Types inherited from impeller::ColorSourceContents
using	BindFragmentCallback = std::function< bool(RenderPass &pass)>
using	PipelineBuilderCallback = std::function< PipelineRef(ContentContextOptions)>
using	CreateGeometryCallback = std::function< GeometryResult(const ContentContext &renderer, const Entity &entity, RenderPass &pass, const Geometry *geom)>
Public Types inherited from impeller::Contents
using	ColorFilterProc = std::function< Color(Color)>
using	RenderProc = std::function< bool(const ContentContext &renderer, const Entity &entity, RenderPass &pass)>
using	CoverageProc = std::function< std::optional< Rect >(const Entity &entity)>
Protected Member Functions inherited from impeller::ColorSourceContents
bool	AppliesAlphaForStrokeCoverage (const Matrix &transform) const
	Whether the entity should be treated as non-opaque due to stroke geometry requiring alpha for coverage.
template<typename VertexShaderT >
bool	DrawGeometry (const ContentContext &renderer, const Entity &entity, RenderPass &pass, const PipelineBuilderCallback &pipeline_callback, typename VertexShaderT::FrameInfo frame_info, const BindFragmentCallback &bind_fragment_callback, bool force_stencil=false, const CreateGeometryCallback &create_geom_callback=DefaultCreateGeometryCallback) const
Static Protected Member Functions inherited from impeller::ColorSourceContents
static GeometryResult	DefaultCreateGeometryCallback (const ContentContext &renderer, const Entity &entity, RenderPass &pass, const Geometry *geom)

Detailed Description

Definition at line 15 of file circle_contents.h.

Member Function Documentation

GetCoverage()

std::optional< Rect > impeller::CircleContents::GetCoverage ( const Entity &  entity ) const

overridevirtual

Get the area of the render pass that will be affected when this contents is rendered.

During rendering, coverage coordinates count pixels from the top left corner of the framebuffer.

Returns

The coverage rectangle. An std::nullopt result means that rendering this contents has no effect on the output color.

Implements impeller::Contents.

Definition at line 88 of file circle_contents.cc.

                                                                        {
  return geometry_->GetCoverage(entity.GetTransform());
}

References impeller::Entity::GetTransform().

Make()

std::unique_ptr< CircleContents > impeller::CircleContents::Make ( std::unique_ptr< CircleGeometry >  geometry, Color  color, bool  stroked  )

static

Definition at line 36 of file circle_contents.cc.

                  {
  return std::unique_ptr<CircleContents>(
      new CircleContents(std::move(geometry), color, stroked));
}

Render()

bool impeller::CircleContents::Render ( const ContentContext &  renderer, const Entity &  entity, RenderPass &  pass  ) const

overridevirtual

Implements impeller::Contents.

Definition at line 49 of file circle_contents.cc.

                                                    {
  auto& data_host_buffer = renderer.GetTransientsDataBuffer();
 
  VS::FrameInfo frame_info;
  FS::FragInfo frag_info;
  frag_info.color = color_.WithAlpha(color_.alpha * GetOpacityFactor());
  frag_info.center = geometry_->GetCenter();
  frag_info.radius = geometry_->GetRadius();
  frag_info.stroke_width = geometry_->GetStrokeWidth();
  frag_info.aa_pixels = 1.0;
  frag_info.stroked = stroked_ ? 1.0f : 0.0f;
 
  auto geometry_result =
      CreateGeometry(renderer, entity, pass, geometry_.get());
 
  PipelineBuilderCallback pipeline_callback =
      [&renderer](ContentContextOptions options) {
        return renderer.GetCirclePipeline(options);
      };
 
  return ColorSourceContents::DrawGeometry<VS>(
      this, geometry_.get(), renderer, entity, pass, pipeline_callback,
      frame_info,
      /*bind_fragment_callback=*/
      [&frag_info, &data_host_buffer](RenderPass& pass) {
        FS::BindFragInfo(pass, data_host_buffer.EmplaceUniform(frag_info));
        pass.SetCommandLabel("Circle");
        return true;
      },
      /*force_stencil=*/false,
      /*create_geom_callback=*/
      [geometry_result = std::move(geometry_result)](
          const ContentContext& renderer, const Entity& entity,
          RenderPass& pass,
          const Geometry* geometry) { return geometry_result; });
}

References impeller::Color::alpha, impeller::ContentContext::GetCirclePipeline(), impeller::ColorSourceContents::GetOpacityFactor(), impeller::ContentContext::GetTransientsDataBuffer(), and impeller::Color::WithAlpha().

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

• impeller/entity/contents/circle_contents.h
• impeller/entity/contents/circle_contents.cc