| Flutter Impeller |

Public Member Functions | List of all members
impeller::MatrixFilterContents Class Referencefinal

`#include <matrix_filter_contents.h>`

Inheritance diagram for impeller::MatrixFilterContents:

## Public Member Functions
| MatrixFilterContents ()
| ~MatrixFilterContents () override
void | SetMatrix (Matrix matrix)
void | SetRenderingMode (Entity::RenderingMode rendering_mode) override
| Marks this filter chain as applying in a subpass scenario. More...
void | SetSamplerDescriptor (const SamplerDescriptor &desc)
std::optional< Rect > | GetFilterCoverage (const FilterInput::Vector &inputs, const Entity &entity, const Matrix &effect_transform) const override
| Internal utility method for |GetLocalCoverage| that computes the output coverage of this filter across the specified inputs, ignoring the coverage hint. More...
Public Member Functions inherited from impeller::FilterContents
| FilterContents ()
| ~FilterContents () override
void | SetInputs (FilterInput::Vector inputs)
| The input texture sources for this filter. Each input's emitted texture is expected to have premultiplied alpha colors. More...
void | SetEffectTransform (const Matrix &effect_transform)
| Sets the transform which gets appended to the effect of this filter. Note that this is in addition to the entity's transform. More...
std::optional< Entity > | GetEntity (const ContentContext &renderer, const Entity &entity, const std::optional< Rect > &coverage_hint) const
| Create an Entity that renders this filter's output. More...
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. 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="Filter 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...
std::optional< Rect > | GetSourceCoverage (const Matrix &effect_transform, const Rect &output_limit) const
| Determines the coverage of source pixels that will be needed to produce results for the specified |output_limit| under the specified |effect_transform|. This is essentially a reverse of the |GetCoverage| method computing a source coverage from an intended |output_limit| coverage. More...
virtual Matrix | GetLocalTransform (const Matrix &parent_transform) const
Matrix | GetTransform (const Matrix &parent_transform) const
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...
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::FilterContents
enum class | BlurStyle { kNormal , kSolid , kOuter , kInner }
enum class | MorphType { kDilate , kErode }
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::FilterContents
static std::shared_ptr< FilterContents > | MakeGaussianBlur (const FilterInput::Ref &input, Sigma sigma_x, Sigma sigma_y, Entity::TileMode tile_mode=Entity::TileMode::kDecal, BlurStyle mask_blur_style=BlurStyle::kNormal, const Geometry *mask_geometry=nullptr)
static std::shared_ptr< FilterContents > | MakeBorderMaskBlur (FilterInput::Ref input, Sigma sigma_x, Sigma sigma_y, BlurStyle blur_style=BlurStyle::kNormal)
static std::shared_ptr< FilterContents > | MakeDirectionalMorphology (FilterInput::Ref input, Radius radius, Vector2 direction, MorphType morph_type)
static std::shared_ptr< FilterContents > | MakeMorphology (FilterInput::Ref input, Radius radius_x, Radius radius_y, MorphType morph_type)
static std::shared_ptr< FilterContents > | MakeMatrixFilter (FilterInput::Ref input, const Matrix &matrix, const SamplerDescriptor &desc)
static std::shared_ptr< FilterContents > | MakeLocalMatrixFilter (FilterInput::Ref input, const Matrix &matrix)
static std::shared_ptr< FilterContents > | MakeYUVToRGBFilter (std::shared_ptr< Texture > y_texture, std::shared_ptr< Texture > uv_texture, YUVColorSpace yuv_color_space)
static std::shared_ptr< FilterContents > | MakeRuntimeEffect (FilterInput::Ref input, std::shared_ptr< RuntimeStage > runtime_stage, std::shared_ptr< std::vector< uint8_t >> uniforms, std::vector< RuntimeEffectContents::TextureInput > texture_inputs)
Static Public Member Functions inherited from impeller::Contents
static std::shared_ptr< Contents > | MakeAnonymous (RenderProc render_proc, CoverageProc coverage_proc)
Static Public Attributes inherited from impeller::FilterContents
static const int32_t | kBlurFilterRequiredMipCount

## Detailed Description

Definition at line 13 of file matrix_filter_contents.h.

## Constructor & Destructor Documentation

## ◆ MatrixFilterContents()

impeller::MatrixFilterContents::MatrixFilterContents | ( |  | ) |
| default

## ◆ ~MatrixFilterContents()

impeller::MatrixFilterContents::~MatrixFilterContents | ( |  | ) |
| override default

## Member Function Documentation

## ◆ GetFilterCoverage()

std::optional< Rect > impeller::MatrixFilterContents::GetFilterCoverage | ( | const FilterInput::Vector & | inputs,
|  | const Entity & | entity,
|  | const Matrix & | effect_transform
| ) |  | const
| override virtual

Internal utility method for |GetLocalCoverage| that computes the output coverage of this filter across the specified inputs, ignoring the coverage hint.

Reimplemented from impeller::FilterContents.

Definition at line 120 of file matrix_filter_contents.cc.

123 {
124 if (inputs.empty()) {
125 return std::nullopt;
126 }
127
128 std::optional<Rect> coverage = inputs[0]->GetCoverage(entity);
129 if (!coverage.has_value()) {
130 return std::nullopt;
131 }
132
133 Matrix input_transform = inputs[0]->GetTransform(entity);
134 if (rendering_mode_ ==
135 Entity::RenderingMode::kSubpassPrependSnapshotTransform ||
136 rendering_mode_ ==
137 Entity::RenderingMode::kSubpassAppendSnapshotTransform) {
138 Rect coverage_bounds = coverage->TransformBounds(input_transform.Invert());
139 Matrix transform = CalculateSubpassTransform(
140 input_transform, effect_transform, matrix_, rendering_mode_);
141 return coverage_bounds.TransformBounds(transform);
142 } else {
143 Matrix transform = input_transform * //
144 matrix_ * //
145 input_transform.Invert(); //
146 return coverage->TransformBounds(transform);
147 }
148 }
impeller::Entity::RenderingMode::kSubpassPrependSnapshotTransform
@ kSubpassPrependSnapshotTransform
impeller::Entity::RenderingMode::kSubpassAppendSnapshotTransform
@ kSubpassAppendSnapshotTransform
transform
Matrix transform
Definition: gaussian_blur_filter_contents.cc:214
impeller::Rect
TRect< Scalar > Rect
Definition: rect.h:792
impeller::Matrix::Invert
Matrix Invert() const
Definition: matrix.cc:97
impeller::TRect::TransformBounds
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:476

References impeller::Matrix::Invert(), impeller::Entity::kSubpassAppendSnapshotTransform, impeller::Entity::kSubpassPrependSnapshotTransform, transform, and impeller::TRect< T >::TransformBounds().

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

## ◆ SetMatrix()

void impeller::MatrixFilterContents::SetMatrix | ( | Matrix | matrix | ) |

Definition at line 13 of file matrix_filter_contents.cc.

13 {
14 matrix_ = matrix;
15 }

Referenced by impeller::testing::TEST(), and impeller::testing::TEST_P().

## ◆ SetRenderingMode()

void impeller::MatrixFilterContents::SetRenderingMode | ( | Entity::RenderingMode | rendering_mode | ) |
| override virtual

Marks this filter chain as applying in a subpass scenario.

        Subpasses render in screenspace, and this setting informs filters
        that the current transform matrix of the entity is not stored
        in the Entity transform matrix. Instead, the effect transform
        is used in this case.

Reimplemented from impeller::FilterContents.

Definition at line 17 of file matrix_filter_contents.cc.

18 {
19 rendering_mode_ = rendering_mode;
20 FilterContents::SetRenderingMode(rendering_mode);
21 }
impeller::FilterContents::SetRenderingMode
virtual void SetRenderingMode(Entity::RenderingMode rendering_mode)
Marks this filter chain as applying in a subpass scenario.
Definition: filter_contents.cc:284

References impeller::FilterContents::SetRenderingMode().

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

## ◆ SetSamplerDescriptor()

void impeller::MatrixFilterContents::SetSamplerDescriptor | ( | const SamplerDescriptor & | desc | ) |

Definition at line 23 of file matrix_filter_contents.cc.

23 {
24 sampler_descriptor_ = desc;
25 }

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

- impeller/entity/contents/filters/matrix_filter_contents.h
- impeller/entity/contents/filters/matrix_filter_contents.cc