#include <atlas_contents.h>

Inheritance diagram for impeller::ColorFilterAtlasContents:

Public Member Functions
	ColorFilterAtlasContents ()

	~ColorFilterAtlasContents () override

void	SetGeometry (AtlasGeometry *geometry)

void	SetAlpha (Scalar alpha)

void	SetMatrix (ColorMatrix matrix)

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. More...

bool	Render (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override

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()`. More...

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. More...

virtual std::optional< Snapshot >	RenderToSnapshot (const ContentContext &renderer, const Entity &entity, std::optional< Rect > coverage_limit=std::nullopt, const std::optional< SamplerDescriptor > &sampler_descriptor=std::nullopt, bool msaa_enabled=true, int32_t mip_count=1, std::string_view label="Snapshot") 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)`. More...

std::optional< Size >	GetColorSourceSize () const
	Return the color source's intrinsic size, if available. More...

void	SetColorSourceSize (Size size)

virtual void	SetInheritedOpacity (Scalar opacity)
	Inherit the provided opacity. More...

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. More...

virtual bool	ApplyColorFilter (const ColorFilterProc &color_filter_proc)
	If possible, applies a color filter to this contents inputs on the CPU. More...

Additional Inherited Members
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)>

Static Public Member Functions inherited from impeller::Contents
static std::shared_ptr< Contents >	MakeAnonymous (RenderProc render_proc, CoverageProc coverage_proc)

Detailed Description

A specialized atlas class for applying a color matrix filter to a drawImageRect call.

Definition at line 122 of file atlas_contents.h.

Constructor & Destructor Documentation

◆ ColorFilterAtlasContents()

impeller::ColorFilterAtlasContents::ColorFilterAtlasContents ( )

explicitdefault

◆ ~ColorFilterAtlasContents()

impeller::ColorFilterAtlasContents::~ColorFilterAtlasContents ( )

overridedefault

Member Function Documentation

◆ GetCoverage()

std::optional< Rect > impeller::ColorFilterAtlasContents::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 288 of file atlas_contents.cc.

                                 {
   if (!geometry_) {
     return std::nullopt;
   }
   return geometry_->ComputeBoundingBox().TransformBounds(entity.GetTransform());
 }

References impeller::AtlasGeometry::ComputeBoundingBox(), impeller::Entity::GetTransform(), and impeller::TRect< T >::TransformBounds().

◆ Render()

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

overridevirtual

Implements impeller::Contents.

Definition at line 308 of file atlas_contents.cc.

                                                               {
   if (geometry_->ShouldSkip() || alpha_ <= 0.0) {
     return true;
   }
  
   const SamplerDescriptor& dst_sampler_descriptor =
       geometry_->GetSamplerDescriptor();
  
   raw_ptr<const Sampler> dst_sampler =
       renderer.GetContext()->GetSamplerLibrary()->GetSampler(
           dst_sampler_descriptor);
  
   auto& host_buffer = renderer.GetTransientsBuffer();
  
   using VS = ColorMatrixColorFilterPipeline::VertexShader;
   using FS = ColorMatrixColorFilterPipeline::FragmentShader;
  
 #ifdef IMPELLER_DEBUG
   pass.SetCommandLabel("Atlas ColorFilter");
 #endif  // IMPELLER_DEBUG
   pass.SetVertexBuffer(geometry_->CreateSimpleVertexBuffer(host_buffer));
   pass.SetPipeline(
       renderer.GetColorMatrixColorFilterPipeline(OptionsFromPass(pass)));
  
   FS::FragInfo frag_info;
   VS::FrameInfo frame_info;
  
   FS::BindInputTexture(pass, geometry_->GetAtlas(), dst_sampler);
   frame_info.texture_sampler_y_coord_scale =
       geometry_->GetAtlas()->GetYCoordScale();
  
   frag_info.input_alpha = 1;
   frag_info.output_alpha = alpha_;
   const float* matrix = matrix_.array;
   frag_info.color_v = Vector4(matrix[4], matrix[9], matrix[14], matrix[19]);
   frag_info.color_m = Matrix(matrix[0], matrix[5], matrix[10], matrix[15],  //
                              matrix[1], matrix[6], matrix[11], matrix[16],  //
                              matrix[2], matrix[7], matrix[12], matrix[17],  //
                              matrix[3], matrix[8], matrix[13], matrix[18]   //
   );
  
   FS::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
  
   frame_info.mvp = entity.GetShaderTransform(pass);
  
   auto uniform_view = host_buffer.EmplaceUniform(frame_info);
   VS::BindFrameInfo(pass, uniform_view);
  
   return pass.Draw().ok();
 }

References impeller::ColorMatrix::array, impeller::AtlasGeometry::CreateSimpleVertexBuffer(), impeller::RenderPass::Draw(), impeller::AtlasGeometry::GetAtlas(), impeller::ContentContext::GetColorMatrixColorFilterPipeline(), impeller::ContentContext::GetContext(), impeller::AtlasGeometry::GetSamplerDescriptor(), impeller::Entity::GetShaderTransform(), impeller::ContentContext::GetTransientsBuffer(), impeller::OptionsFromPass(), impeller::RenderPass::SetCommandLabel(), impeller::RenderPass::SetPipeline(), impeller::RenderPass::SetVertexBuffer(), and impeller::AtlasGeometry::ShouldSkip().

◆ SetAlpha()

void impeller::ColorFilterAtlasContents::SetAlpha ( Scalar alpha )

Definition at line 300 of file atlas_contents.cc.

                                                     {
   alpha_ = alpha;
 }

◆ SetGeometry()

void impeller::ColorFilterAtlasContents::SetGeometry ( AtlasGeometry * geometry )

Definition at line 296 of file atlas_contents.cc.

                                                                   {
   geometry_ = geometry;
 }

◆ SetMatrix()

void impeller::ColorFilterAtlasContents::SetMatrix ( ColorMatrix matrix )

Definition at line 304 of file atlas_contents.cc.

                                                            {
   matrix_ = matrix;
 }

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

impeller/entity/contents/atlas_contents.h
impeller/entity/contents/atlas_contents.cc

Public Member Functions

Additional Inherited Members