| Flutter Impeller |

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

`#include <texture_contents.h>`

Inheritance diagram for impeller::TextureContents:

## Public Member Functions
| TextureContents ()
| ~TextureContents () override
void | SetLabel (std::string label)
void | SetDestinationRect (Rect rect)
void | SetTexture (std::shared_ptr< Texture > texture)
std::shared_ptr< Texture > | GetTexture () const
void | SetSamplerDescriptor (SamplerDescriptor desc)
const SamplerDescriptor & | GetSamplerDescriptor () const
void | SetSourceRect (const Rect &source_rect)
const Rect & | GetSourceRect () const
void | SetOpacity (Scalar opacity)
Scalar | GetOpacity () const
void | SetStencilEnabled (bool enabled)
std::optional< Rect > | GetCoverage (const Entity &entity) const override
| Get the screen space bounding rectangle that this contents affects. 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, const std::string &label="Texture Snapshot") const override
| Render this contents to a snapshot, respecting the entity's transform, path, stencil depth, and blend mode. The result texture size is always the size of `GetCoverage(entity)`. More...
bool | Render (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
bool | CanInheritOpacity (const Entity &entity) const override
| Whether or not this contents can accept the opacity peephole optimization. More...
void | SetInheritedOpacity (Scalar opacity) override
| Inherit the provided opacity. More...
void | SetDeferApplyingOpacity (bool defer_applying_opacity)
Public Member Functions inherited from impeller::Contents
| Contents ()
virtual | ~Contents ()
virtual void | PopulateGlyphAtlas (const std::shared_ptr< LazyGlyphAtlas > &lazy_glyph_atlas, Scalar scale)
| Add any text data to the specified lazy atlas. The scale parameter must be used again later when drawing the text. More...
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
| 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 StencilCoverage | GetStencilCoverage (const Entity &entity, const std::optional< Rect > &current_stencil_coverage) const
| Given the current screen space bounding rectangle of the stencil, return the expected stencil coverage after this draw call. This should only be implemented for contents that may write to the stencil buffer. More...
virtual bool | ShouldRender (const Entity &entity, const std::optional< Rect > stencil_coverage) 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 const FilterContents * | AsFilter () const
| Cast to a filter. Returns `nullptr` if this Contents is not a filter. More...
virtual bool | ApplyColorFilter (const ColorFilterProc &color_filter_proc)
| If possible, applies a color filter to this contents inputs on the CPU. More...

## Static Public Member Functions
static std::shared_ptr< TextureContents > | MakeRect (Rect destination)
| A common case factory that marks the texture contents as having a destination rectangle. In this situation, a subpass can be avoided when image filters are applied. More...
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::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)>

## Detailed Description

Definition at line 20 of file texture_contents.h.

## Constructor & Destructor Documentation

## ◆ TextureContents()

impeller::TextureContents::TextureContents | ( |  | ) |
| default

## ◆ ~TextureContents()

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

## Member Function Documentation

## ◆ CanInheritOpacity()

bool impeller::TextureContents::CanInheritOpacity | ( | const Entity & | entity | ) | const
| override virtual

Whether or not this contents can accept the opacity peephole optimization.

By default all contents return false. Contents are responsible for determining whether or not their own geometries intersect in a way that makes accepting opacity impossible. It is always safe to return false, especially if computing overlap would be computationally expensive.

Reimplemented from impeller::Contents.

Definition at line 58 of file texture_contents.cc.

58 {
59 return true;
60 }

## ◆ GetCoverage()

std::optional< Rect > impeller::TextureContents::GetCoverage | ( | const Entity & | entity | ) | const
| override virtual

Get the screen space bounding rectangle that this contents affects.

Implements impeller::Contents.

Definition at line 70 of file texture_contents.cc.

70 {
71 if (GetOpacity() == 0) {
72 return std::nullopt;
73 }
74 return destination_rect_.TransformBounds(entity.GetTransformation());
75 };

References GetOpacity(), impeller::Entity::GetTransformation(), and impeller::TRect< T >::TransformBounds().

## ◆ GetOpacity()

Scalar impeller::TextureContents::GetOpacity | ( |  | ) | const

Definition at line 66 of file texture_contents.cc.

66 {
67 return opacity_ * inherited_opacity_;
68 }

Referenced by GetCoverage(), Render(), and RenderToSnapshot().

## ◆ GetSamplerDescriptor()

const SamplerDescriptor & impeller::TextureContents::GetSamplerDescriptor | ( |  | ) | const

Definition at line 204 of file texture_contents.cc.

204 {
205 return sampler_descriptor_;
206 }

## ◆ GetSourceRect()

const Rect & impeller::TextureContents::GetSourceRect | ( |  | ) | const

Definition at line 196 of file texture_contents.cc.

196 {
197 return source_rect_;
198 }

## ◆ GetTexture()

std::shared_ptr< Texture > impeller::TextureContents::GetTexture | ( |  | ) | const

Definition at line 46 of file texture_contents.cc.

46 {
47 return texture_;
48 }

## ◆ MakeRect()

std::shared_ptr< TextureContents > impeller::TextureContents::MakeRect | ( | Rect | destination | ) |
| static

A common case factory that marks the texture contents as having a destination rectangle. In this situation, a subpass can be avoided when image filters are applied.

Definition at line 28 of file texture_contents.cc.

28 {
29 auto contents = std::make_shared<TextureContents>();
30 contents->destination_rect_ = destination;
31 return contents;
32 }

Referenced by impeller::PaintPassDelegate::CreateContentsForSubpassTarget(), impeller::Canvas::DrawImageRect(), impeller::Entity::FromSnapshot(), and impeller::testing::TEST_P().

## ◆ Render()

bool impeller::TextureContents::Render | ( | const ContentContext & | renderer,
|  | const Entity & | entity,
|  | RenderPass & | pass
| ) |  | const
| override virtual

Implements impeller::Contents.

Definition at line 108 of file texture_contents.cc.

110 {
111 auto capture = entity.GetCapture().CreateChild("TextureContents");
112
113 using VS = TextureFillVertexShader;
114 using FS = TextureFillFragmentShader;
115 using FSExternal = TextureFillExternalFragmentShader;
116
117 if (destination_rect_.size.IsEmpty() || source_rect_.IsEmpty() ||
118 texture_ == nullptr || texture_->GetSize().IsEmpty()) {
119 return true; // Nothing to render.
120 }
121
122 bool is_external_texture =
123 texture_->GetTextureDescriptor().type == TextureType::kTextureExternalOES;
124
125 // Expand the source rect by half a texel, which aligns sampled texels to the
126 // pixel grid if the source rect is the same size as the destination rect.
127 auto texture_coords =
128 Rect::MakeSize(texture_->GetSize())
129 .Project(capture.AddRect("Source rect", source_rect_).Expand(0.5));
130
131 VertexBufferBuilder<VS::PerVertexData> vertex_builder;
132
133 auto destination_rect =
134 capture.AddRect("Destination rect", destination_rect_);
135 vertex_builder.AddVertices({
136 {destination_rect.GetLeftTop(), texture_coords.GetLeftTop()},
137 {destination_rect.GetRightTop(), texture_coords.GetRightTop()},
138 {destination_rect.GetLeftBottom(), texture_coords.GetLeftBottom()},
139 {destination_rect.GetRightBottom(), texture_coords.GetRightBottom()},
140 });
141
142 auto& host_buffer = pass.GetTransientsBuffer();
143
144 VS::FrameInfo frame_info;
145 frame_info.mvp = Matrix::MakeOrthographic(pass.GetRenderTargetSize()) *
146 capture.AddMatrix("Transform", entity.GetTransformation());
147 frame_info.texture_sampler_y_coord_scale = texture_->GetYCoordScale();
148 frame_info.alpha = capture.AddScalar("Alpha", GetOpacity());
149
150 Command cmd;
151 if (label_.empty()) {
152 DEBUG_COMMAND_INFO(cmd, "Texture Fill");
153 } else {
154 DEBUG_COMMAND_INFO(cmd, "Texture Fill: " + label_);
155 }
156
157 auto pipeline_options = OptionsFromPassAndEntity(pass, entity);
158 if (!stencil_enabled_) {
159 pipeline_options.stencil_compare = CompareFunction::kAlways;
160 }
161 pipeline_options.primitive_type = PrimitiveType::kTriangleStrip;
162
163 #ifdef IMPELLER_ENABLE_OPENGLES
164 if (is_external_texture) {
165 cmd.pipeline = renderer.GetTextureExternalPipeline(pipeline_options);
166 } else {
167 cmd.pipeline = renderer.GetTexturePipeline(pipeline_options);
168 }
169 #else
170 cmd.pipeline = renderer.GetTexturePipeline(pipeline_options);
171 #endif // IMPELLER_ENABLE_OPENGLES
172
173 cmd.stencil_reference = entity.GetStencilDepth();
174 cmd.BindVertices(vertex_builder.CreateVertexBuffer(host_buffer));
175 VS::BindFrameInfo(cmd, host_buffer.EmplaceUniform(frame_info));
176 if (is_external_texture) {
177 FSExternal::BindSAMPLEREXTERNALOESTextureSampler(
178 cmd, texture_,
179 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
180 sampler_descriptor_));
181 } else {
182 FS::BindTextureSampler(
183 cmd, texture_,
184 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
185 sampler_descriptor_));
186 }
187 pass.AddCommand(std::move(cmd));
188
189 return true;
190 }

References impeller::RenderPass::AddCommand(), impeller::VertexBufferBuilder< VertexType_, IndexType_ >::AddVertices(), impeller::Command::BindVertices(), impeller::Capture::CreateChild(), impeller::VertexBufferBuilder< VertexType_, IndexType_ >::CreateVertexBuffer(), DEBUG_COMMAND_INFO, impeller::Entity::GetCapture(), impeller::ContentContext::GetContext(), GetOpacity(), impeller::RenderPass::GetRenderTargetSize(), impeller::Entity::GetStencilDepth(), impeller::ContentContext::GetTexturePipeline(), impeller::Entity::GetTransformation(), impeller::RenderPass::GetTransientsBuffer(), impeller::TSize< T >::IsEmpty(), impeller::TRect< T >::IsEmpty(), impeller::kAlways, impeller::kTextureExternalOES, impeller::kTriangleStrip, impeller::Matrix::MakeOrthographic(), impeller::TRect< Scalar >::MakeSize(), impeller::OptionsFromPassAndEntity(), impeller::Command::pipeline, impeller::TRect< T >::Project(), impeller::TRect< T >::size, and impeller::Command::stencil_reference.

## ◆ RenderToSnapshot()

std::optional< Snapshot > impeller::TextureContents::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`,
|  | const std::string & | label = `"Texture Snapshot"`
| ) |  | const
| override virtual

Render this contents to a snapshot, respecting the entity's transform, path, stencil depth, and blend mode. The result texture size is always the size of `GetCoverage(entity)`.

Reimplemented from impeller::Contents.

Definition at line 77 of file texture_contents.cc.

83 {
84 // Passthrough textures that have simple rectangle paths and complete source
85 // rects.
86 auto bounds = destination_rect_;
87 auto opacity = GetOpacity();
88 if (source_rect_ == Rect::MakeSize(texture_->GetSize()) &&
89 (opacity >= 1 - kEhCloseEnough || defer_applying_opacity_)) {
90 auto scale = Vector2(bounds.size / Size(texture_->GetSize()));
91 return Snapshot{
92 .texture = texture_,
93 .transform = entity.GetTransformation() *
94 Matrix::MakeTranslation(bounds.origin) *
95 Matrix::MakeScale(scale),
96 .sampler_descriptor = sampler_descriptor.value_or(sampler_descriptor_),
97 .opacity = opacity};
98 }
99 return Contents::RenderToSnapshot(
100 renderer, // renderer
101 entity, // entity
102 std::nullopt, // coverage_limit
103 sampler_descriptor.value_or(sampler_descriptor_), // sampler_descriptor
104 true, // msaa_enabled
105 label); // label
106 }

References GetOpacity(), impeller::Entity::GetTransformation(), impeller::kEhCloseEnough, impeller::Matrix::MakeScale(), impeller::TRect< Scalar >::MakeSize(), impeller::Matrix::MakeTranslation(), impeller::Contents::RenderToSnapshot(), and impeller::Snapshot::texture.

## ◆ SetDeferApplyingOpacity()

void impeller::TextureContents::SetDeferApplyingOpacity | ( | bool | defer_applying_opacity | ) |

Definition at line 208 of file texture_contents.cc.

208 {
209 defer_applying_opacity_ = defer_applying_opacity;
210 }

## ◆ SetDestinationRect()

void impeller::TextureContents::SetDestinationRect | ( | Rect | rect | ) |

Definition at line 38 of file texture_contents.cc.

38 {
39 destination_rect_ = rect;
40 }

## ◆ SetInheritedOpacity()

void impeller::TextureContents::SetInheritedOpacity | ( | Scalar | opacity | ) |
| override virtual

Inherit the provided opacity.

       Use of this method is invalid if CanAcceptOpacity returns false.

Reimplemented from impeller::Contents.

Definition at line 62 of file texture_contents.cc.

62 {
63 inherited_opacity_ = opacity;
64 }

## ◆ SetLabel()

void impeller::TextureContents::SetLabel | ( | std::string | label | ) |

Definition at line 34 of file texture_contents.cc.

34 {
35 label_ = std::move(label);
36 }

## ◆ SetOpacity()

void impeller::TextureContents::SetOpacity | ( | Scalar | opacity | ) |

Definition at line 50 of file texture_contents.cc.

50 {
51 opacity_ = opacity;
52 }

## ◆ SetSamplerDescriptor()

void impeller::TextureContents::SetSamplerDescriptor | ( | SamplerDescriptor | desc | ) |

Definition at line 200 of file texture_contents.cc.

200 {
201 sampler_descriptor_ = std::move(desc);
202 }

## ◆ SetSourceRect()

void impeller::TextureContents::SetSourceRect | ( | const Rect & | source_rect | ) |

Definition at line 192 of file texture_contents.cc.

192 {
193 source_rect_ = source_rect;
194 }

## ◆ SetStencilEnabled()

void impeller::TextureContents::SetStencilEnabled | ( | bool | enabled | ) |

Definition at line 54 of file texture_contents.cc.

54 {
55 stencil_enabled_ = enabled;
56 }

## ◆ SetTexture()

void impeller::TextureContents::SetTexture | ( | std::shared_ptr< Texture > | texture | ) |

Definition at line 42 of file texture_contents.cc.

42 {
43 texture_ = std::move(texture);
44 }

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

- impeller/entity/contents/texture_contents.h
- impeller/entity/contents/texture_contents.cc

impeller::TextureType::kTextureExternalOES
@ kTextureExternalOES
DEBUG_COMMAND_INFO
#define DEBUG_COMMAND_INFO(obj, arg)
Definition: command.h:31
impeller::TRect::size
TSize< Type > size
Definition: rect.h:24
impeller::kEhCloseEnough
constexpr float kEhCloseEnough
Definition: constants.h:55
impeller::TRect::TransformBounds
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:204
impeller::Vector2
Point Vector2
Definition: point.h:310
impeller::Size
TSize< Scalar > Size
Definition: size.h:135
impeller::Matrix::MakeTranslation
static constexpr Matrix MakeTranslation(const Vector3 &t)
Definition: matrix.h:94
impeller::PrimitiveType::kTriangleStrip
@ kTriangleStrip
impeller::TextureContents::GetOpacity
Scalar GetOpacity() const
Definition: texture_contents.cc:66
impeller::TRect::IsEmpty
constexpr bool IsEmpty() const
Definition: rect.h:133
impeller::OptionsFromPassAndEntity
ContentContextOptions OptionsFromPassAndEntity(const RenderPass &pass, const Entity &entity)
Definition: contents.cc:30
impeller::CompareFunction::kAlways
@ kAlways
Comparison test passes always passes.
impeller::TRect< Scalar >::MakeSize
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:52
impeller::TRect::Project
constexpr TRect< T > Project(TRect< T > source) const
Returns a new rectangle that represents the projection of the source rectangle onto this rectangle....
Definition: rect.h:299
impeller::Matrix::MakeOrthographic
static constexpr Matrix MakeOrthographic(TSize< T > size)
Definition: matrix.h:448
impeller::TSize::IsEmpty
constexpr bool IsEmpty() const
Definition: size.h:105
impeller::Matrix::MakeScale
static constexpr Matrix MakeScale(const Vector3 &s)
Definition: matrix.h:103
impeller::Contents::RenderToSnapshot
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, const std::string &label="Snapshot") const
Render this contents to a snapshot, respecting the entity's transform, path, stencil depth,...
Definition: contents.cc:59