impeller::TiledTextureContents Class Reference

#include <tiled_texture_contents.h>

Inheritance diagram for impeller::TiledTextureContents:

Public Types
using	ColorFilterProc = std::function< std::shared_ptr< ColorFilterContents >(FilterInput::Ref)>
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)>

Public Member Functions
	TiledTextureContents ()
	~TiledTextureContents () override
bool	IsOpaque (const Matrix &transform) const override
	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...
bool	Render (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
void	SetTexture (std::shared_ptr< Texture > texture)
void	SetTileModes (Entity::TileMode x_tile_mode, Entity::TileMode y_tile_mode)
void	SetSamplerDescriptor (const SamplerDescriptor &desc)
void	SetColorFilter (ColorFilterProc color_filter)
	Set a color filter to apply directly to this tiled texture. More...
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="Tiled Texture Snapshot") const override
	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...
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. More...
const Geometry *	GetGeometry () const
	Get the geometry that this contents will use to render. More...
void	SetEffectTransform (Matrix matrix)
	Set the effect transform for this color source. More...
const Matrix &	GetInverseEffectTransform () const
	Set the inverted effect transform for this color source. More...
void	SetOpacityFactor (Scalar opacity)
	Set the opacity factor for this color source. More...
Scalar	GetOpacityFactor () const
	Get the opacity factor for this color source. More...
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. More...
void	SetInheritedOpacity (Scalar opacity) override
	Inherit the provided opacity. More...
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
std::optional< Size >	GetColorSourceSize () const
	Return the color source's intrinsic size, if available. More...
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. 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
Static Public Member Functions inherited from impeller::Contents
static std::shared_ptr< Contents >	MakeAnonymous (RenderProc render_proc, CoverageProc coverage_proc)
Protected 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)>
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. More...
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 19 of file tiled_texture_contents.h.

Member Typedef Documentation

ColorFilterProc

using impeller::TiledTextureContents::ColorFilterProc = std::function<std::shared_ptr<ColorFilterContents>(FilterInput::Ref)>

Definition at line 25 of file tiled_texture_contents.h.

Constructor & Destructor Documentation

TiledTextureContents()

impeller::TiledTextureContents::TiledTextureContents ( )

default

~TiledTextureContents()

impeller::TiledTextureContents::~TiledTextureContents ( )

overridedefault

Member Function Documentation

IsOpaque()

bool impeller::TiledTextureContents::IsOpaque ( const Matrix &  transform ) const

overridevirtual

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.

Parameters

transform

The current transform matrix of the entity that will render this contents.

Reimplemented from impeller::Contents.

Definition at line 99 of file tiled_texture_contents.cc.

                                                                 {
  if (GetOpacityFactor() < 1 || x_tile_mode_ == Entity::TileMode::kDecal ||
      y_tile_mode_ == Entity::TileMode::kDecal) {
    return false;
  }
  if (color_filter_) {
    return false;
  }
  return texture_->IsOpaque() && !AppliesAlphaForStrokeCoverage(transform);
}

References impeller::ColorSourceContents::AppliesAlphaForStrokeCoverage(), impeller::ColorSourceContents::GetOpacityFactor(), impeller::Entity::kDecal, and transform.

Referenced by impeller::testing::TEST_P().

Render()

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

overridevirtual

Implements impeller::Contents.

Definition at line 110 of file tiled_texture_contents.cc.

                                                          {
  if (texture_ == nullptr) {
    return true;
  }
 
  using VS = TextureUvFillVertexShader;
  using FS = TiledTextureFillFragmentShader;
 
  const auto texture_size = texture_->GetSize();
  if (texture_size.IsEmpty()) {
    return true;
  }
 
  VS::FrameInfo frame_info;
  frame_info.texture_sampler_y_coord_scale = texture_->GetYCoordScale();
  frame_info.uv_transform =
      Rect::MakeSize(texture_size).GetNormalizingTransform() *
      GetInverseEffectTransform();
 
#ifdef IMPELLER_ENABLE_OPENGLES
  using FSExternal = TiledTextureFillExternalFragmentShader;
  if (texture_->GetTextureDescriptor().type ==
      TextureType::kTextureExternalOES) {
    return ColorSourceContents::DrawGeometry<VS>(
        renderer, entity, pass,
        [&renderer](ContentContextOptions options) {
          return renderer.GetTiledTextureUvExternalPipeline(options);
        },
        frame_info,
        [this, &renderer](RenderPass& pass) {
          auto& host_buffer = renderer.GetTransientsBuffer();
#ifdef IMPELLER_DEBUG
          pass.SetCommandLabel("TextureFill External");
#endif  // IMPELLER_DEBUG
 
          FML_DCHECK(!color_filter_);
          FSExternal::FragInfo frag_info;
          frag_info.x_tile_mode =
              static_cast<Scalar>(sampler_descriptor_.width_address_mode);
          frag_info.y_tile_mode =
              static_cast<Scalar>(sampler_descriptor_.height_address_mode);
          frag_info.alpha = GetOpacityFactor();
          FSExternal::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
 
          SamplerDescriptor sampler_desc;
          // OES_EGL_image_external states that only CLAMP_TO_EDGE is valid,
          // so we emulate all other tile modes here by remapping the texture
          // coordinates.
          sampler_desc.width_address_mode = SamplerAddressMode::kClampToEdge;
          sampler_desc.height_address_mode = SamplerAddressMode::kClampToEdge;
          FSExternal::BindSAMPLEREXTERNALOESTextureSampler(
              pass, texture_,
              renderer.GetContext()->GetSamplerLibrary()->GetSampler(
                  sampler_desc));
          return true;
        });
  }
#endif  // IMPELLER_ENABLE_OPENGLES
 
  PipelineBuilderCallback pipeline_callback =
      [&renderer](ContentContextOptions options) {
        return renderer.GetTiledTexturePipeline(options);
      };
  return ColorSourceContents::DrawGeometry<VS>(
      renderer, entity, pass, pipeline_callback, frame_info,
      [this, &renderer, &entity](RenderPass& pass) {
        auto& host_buffer = renderer.GetTransientsBuffer();
#ifdef IMPELLER_DEBUG
        pass.SetCommandLabel("TextureFill");
#endif  // IMPELLER_DEBUG
 
        FS::FragInfo frag_info;
        frag_info.x_tile_mode = static_cast<Scalar>(x_tile_mode_);
        frag_info.y_tile_mode = static_cast<Scalar>(y_tile_mode_);
        frag_info.alpha =
            GetOpacityFactor() *
            GetGeometry()->ComputeAlphaCoverage(entity.GetTransform());
        FS::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
 
        if (color_filter_) {
          auto filtered_texture = CreateFilterTexture(renderer);
          if (!filtered_texture) {
            return false;
          }
          FS::BindTextureSampler(
              pass, filtered_texture,
              renderer.GetContext()->GetSamplerLibrary()->GetSampler(
                  CreateSamplerDescriptor(renderer.GetDeviceCapabilities())));
        } else {
          FS::BindTextureSampler(
              pass, texture_,
              renderer.GetContext()->GetSamplerLibrary()->GetSampler(
                  CreateSamplerDescriptor(renderer.GetDeviceCapabilities())));
        }
 
        return true;
      });
}

References impeller::Geometry::ComputeAlphaCoverage(), impeller::ContentContext::GetContext(), impeller::ContentContext::GetDeviceCapabilities(), impeller::ColorSourceContents::GetGeometry(), impeller::ColorSourceContents::GetInverseEffectTransform(), impeller::TRect< T >::GetNormalizingTransform(), impeller::ColorSourceContents::GetOpacityFactor(), impeller::ContentContext::GetTiledTexturePipeline(), impeller::Entity::GetTransform(), impeller::ContentContext::GetTransientsBuffer(), impeller::SamplerDescriptor::height_address_mode, impeller::kClampToEdge, impeller::kTextureExternalOES, impeller::TRect< Scalar >::MakeSize(), impeller::RenderPass::SetCommandLabel(), and impeller::SamplerDescriptor::width_address_mode.

Referenced by impeller::testing::TEST_P().

RenderToSnapshot()

std::optional< Snapshot > impeller::TiledTextureContents::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 = "Tiled Texture Snapshot"  ) const

overridevirtual

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).

Reimplemented from impeller::Contents.

Definition at line 211 of file tiled_texture_contents.cc.

                                {
  std::optional<Rect> geometry_coverage = GetGeometry()->GetCoverage({});
  if (GetInverseEffectTransform().IsIdentity() &&
      GetGeometry()->IsAxisAlignedRect() &&
      (!geometry_coverage.has_value() ||
       Rect::MakeSize(texture_->GetSize())
           .Contains(geometry_coverage.value()))) {
    auto coverage = GetCoverage(entity);
    if (!coverage.has_value()) {
      return std::nullopt;
    }
    auto scale = Vector2(coverage->GetSize() / Size(texture_->GetSize()));
 
    return Snapshot{
        .texture = texture_,
        .transform = Matrix::MakeTranslation(coverage->GetOrigin()) *
                     Matrix::MakeScale(scale),
        .sampler_descriptor = sampler_descriptor.value_or(sampler_descriptor_),
        .opacity = GetOpacityFactor(),
    };
  }
 
  return Contents::RenderToSnapshot(
      renderer,                                          // renderer
      entity,                                            // entity
      std::nullopt,                                      // coverage_limit
      sampler_descriptor.value_or(sampler_descriptor_),  // sampler_descriptor
      true,                                              // msaa_enabled
      /*mip_count=*/1,
      label);  // label
}

References impeller::TRect< T >::Contains(), impeller::ColorSourceContents::GetCoverage(), impeller::Geometry::GetCoverage(), impeller::ColorSourceContents::GetGeometry(), impeller::ColorSourceContents::GetInverseEffectTransform(), impeller::ColorSourceContents::GetOpacityFactor(), impeller::Matrix::MakeScale(), impeller::TRect< Scalar >::MakeSize(), impeller::Matrix::MakeTranslation(), impeller::Contents::RenderToSnapshot(), scale, and impeller::Snapshot::texture.

SetColorFilter()

void impeller::TiledTextureContents::SetColorFilter

(

ColorFilterProc

color_filter

)

Set a color filter to apply directly to this tiled texture.

Parameters

color_filter

When applying a color filter to a tiled texture, we can reduce the size and number of the subpasses required and the shader workload by applying the filter to the untiled image and absorbing the opacity before tiling it into the final location.

This may not be a performance improvement if the image is tiled into a much smaller size that its original texture size.

Definition at line 54 of file tiled_texture_contents.cc.

                                                                      {
  color_filter_ = std::move(color_filter);
}

SetSamplerDescriptor()

void impeller::TiledTextureContents::SetSamplerDescriptor

(

const SamplerDescriptor &

desc

)

Definition at line 50 of file tiled_texture_contents.cc.

                                                                             {
  sampler_descriptor_ = desc;
}

SetTexture()

void impeller::TiledTextureContents::SetTexture

(

std::shared_ptr< Texture >

texture

)

Definition at line 40 of file tiled_texture_contents.cc.

                                                                    {
  texture_ = std::move(texture);
}

Referenced by impeller::testing::TEST_P().

SetTileModes()

void impeller::TiledTextureContents::SetTileModes	(	Entity::TileMode	x_tile_mode,
		Entity::TileMode	y_tile_mode
	)

Definition at line 44 of file tiled_texture_contents.cc.

                                                                    {
  x_tile_mode_ = x_tile_mode;
  y_tile_mode_ = y_tile_mode;
}

---

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

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