| Flutter Impeller |

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

`#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 | ( |  | ) |
| override default

## Member Function Documentation

## ◆ IsOpaque()

bool impeller::TiledTextureContents::IsOpaque | ( | const Matrix & | transform | ) | const
| override virtual

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.

99 {
100 if (GetOpacityFactor() < 1 || x_tile_mode_ == Entity::TileMode::kDecal ||
101 y_tile_mode_ == Entity::TileMode::kDecal) {
102 return false;
103 }
104 if (color_filter_) {
105 return false;
106 }
107 return texture_->IsOpaque() && !AppliesAlphaForStrokeCoverage(transform);
108 }
impeller::ColorSourceContents::GetOpacityFactor
Scalar GetOpacityFactor() const
Get the opacity factor for this color source.
Definition: color_source_contents.cc:28
impeller::ColorSourceContents::AppliesAlphaForStrokeCoverage
bool AppliesAlphaForStrokeCoverage(const Matrix &transform) const
Whether the entity should be treated as non-opaque due to stroke geometry requiring alpha for coverag...
Definition: color_source_contents.cc:53
impeller::Entity::TileMode::kDecal
@ kDecal
transform
Matrix transform
Definition: gaussian_blur_filter_contents.cc:214

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
| override virtual

Implements impeller::Contents.

Definition at line 110 of file tiled_texture_contents.cc.

112 {
113 if (texture_ == nullptr) {
114 return true;
115 }
116
117 using VS = TextureUvFillVertexShader;
118 using FS = TiledTextureFillFragmentShader;
119
120 const auto texture_size = texture_->GetSize();
121 if (texture_size.IsEmpty()) {
122 return true;
123 }
124
125 VS::FrameInfo frame_info;
126 frame_info.texture_sampler_y_coord_scale = texture_->GetYCoordScale();
127 frame_info.uv_transform =
128 Rect::MakeSize(texture_size).GetNormalizingTransform() *
129 GetInverseEffectTransform();
130
131 #ifdef IMPELLER_ENABLE_OPENGLES
132 using FSExternal = TiledTextureFillExternalFragmentShader;
133 if (texture_->GetTextureDescriptor().type ==
134 TextureType::kTextureExternalOES) {
135 return ColorSourceContents::DrawGeometry<VS>(
136 renderer, entity, pass,
137 [&renderer](ContentContextOptions options) {
138 return renderer.GetTiledTextureUvExternalPipeline(options);
139 },
140 frame_info,
141 [this, &renderer](RenderPass& pass) {
142 auto& host_buffer = renderer.GetTransientsBuffer();
143 #ifdef IMPELLER_DEBUG
144 pass.SetCommandLabel("TextureFill External");
145 #endif // IMPELLER_DEBUG
146
147 FML_DCHECK(!color_filter_);
148 FSExternal::FragInfo frag_info;
149 frag_info.x_tile_mode =
150 static_cast<Scalar>(sampler_descriptor_.width_address_mode);
151 frag_info.y_tile_mode =
152 static_cast<Scalar>(sampler_descriptor_.height_address_mode);
153 frag_info.alpha = GetOpacityFactor();
154 FSExternal::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
155
156 SamplerDescriptor sampler_desc;
157 // OES_EGL_image_external states that only CLAMP_TO_EDGE is valid,
158 // so we emulate all other tile modes here by remapping the texture
159 // coordinates.
160 sampler_desc.width_address_mode = SamplerAddressMode::kClampToEdge;
161 sampler_desc.height_address_mode = SamplerAddressMode::kClampToEdge;
162 FSExternal::BindSAMPLEREXTERNALOESTextureSampler(
163 pass, texture_,
164 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
165 sampler_desc));
166 return true;
167 });
168 }
169 #endif // IMPELLER_ENABLE_OPENGLES
170
171 PipelineBuilderCallback pipeline_callback =
172 [&renderer](ContentContextOptions options) {
173 return renderer.GetTiledTexturePipeline(options);
174 };
175 return ColorSourceContents::DrawGeometry<VS>(
176 renderer, entity, pass, pipeline_callback, frame_info,
177 [this, &renderer, &entity](RenderPass& pass) {
178 auto& host_buffer = renderer.GetTransientsBuffer();
179 #ifdef IMPELLER_DEBUG
180 pass.SetCommandLabel("TextureFill");
181 #endif // IMPELLER_DEBUG
182
183 FS::FragInfo frag_info;
184 frag_info.x_tile_mode = static_cast<Scalar>(x_tile_mode_);
185 frag_info.y_tile_mode = static_cast<Scalar>(y_tile_mode_);
186 frag_info.alpha =
187 GetOpacityFactor() *
188 GetGeometry()->ComputeAlphaCoverage(entity.GetTransform());
189 FS::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
190
191 if (color_filter_) {
192 auto filtered_texture = CreateFilterTexture(renderer);
193 if (!filtered_texture) {
194 return false;
195 }
196 FS::BindTextureSampler(
197 pass, filtered_texture,
198 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
199 CreateSamplerDescriptor(renderer.GetDeviceCapabilities())));
200 } else {
201 FS::BindTextureSampler(
202 pass, texture_,
203 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
204 CreateSamplerDescriptor(renderer.GetDeviceCapabilities())));
205 }
206
207 return true;
208 });
209 }
impeller::ColorSourceContents::GetGeometry
const Geometry * GetGeometry() const
Get the geometry that this contents will use to render.
Definition: color_source_contents.cc:20
impeller::ColorSourceContents::GetInverseEffectTransform
const Matrix & GetInverseEffectTransform() const
Set the inverted effect transform for this color source.
Definition: color_source_contents.cc:36
impeller::ColorSourceContents::PipelineBuilderCallback
std::function< PipelineRef(ContentContextOptions)> PipelineBuilderCallback
Definition: color_source_contents.h:105
impeller::Geometry::ComputeAlphaCoverage
virtual Scalar ComputeAlphaCoverage(const Matrix &transform) const
Definition: geometry.h:115
impeller::Scalar
float Scalar
Definition: scalar.h:18
impeller::SamplerAddressMode::kClampToEdge
@ kClampToEdge
impeller::VS
GlyphAtlasPipeline::VertexShader VS
Definition: text_contents.cc:25
impeller::TextureType::kTextureExternalOES
@ kTextureExternalOES
impeller::FS
GlyphAtlasPipeline::FragmentShader FS
Definition: text_contents.cc:26
impeller::SamplerDescriptor::width_address_mode
SamplerAddressMode width_address_mode
Definition: sampler_descriptor.h:19
impeller::SamplerDescriptor::height_address_mode
SamplerAddressMode height_address_mode
Definition: sampler_descriptor.h:20
impeller::TRect::GetNormalizingTransform
constexpr Matrix GetNormalizingTransform() const
Constructs a Matrix that will map all points in the coordinate space of the rectangle into a new norm...
Definition: rect.h:495
impeller::TRect< Scalar >::MakeSize
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:150

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
| override virtual

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.

218 {
219 std::optional<Rect> geometry_coverage = GetGeometry()->GetCoverage({});
220 if (GetInverseEffectTransform().IsIdentity() &&
221 GetGeometry()->IsAxisAlignedRect() &&
222 (!geometry_coverage.has_value() ||
223 Rect::MakeSize(texture_->GetSize())
224 .Contains(geometry_coverage.value()))) {
225 auto coverage = GetCoverage(entity);
226 if (!coverage.has_value()) {
227 return std::nullopt;
228 }
229 auto scale = Vector2(coverage->GetSize() / Size(texture_->GetSize()));
230
231 return Snapshot{
232 .texture = texture_,
233 .transform = Matrix::MakeTranslation(coverage->GetOrigin()) *
234 Matrix::MakeScale(scale),
235 .sampler_descriptor = sampler_descriptor.value_or(sampler_descriptor_),
236 .opacity = GetOpacityFactor(),
237 };
238 }
239
240 return Contents::RenderToSnapshot(
241 renderer, // renderer
242 entity, // entity
243 std::nullopt, // coverage_limit
244 sampler_descriptor.value_or(sampler_descriptor_), // sampler_descriptor
245 true, // msaa_enabled
246 /*mip_count=*/1,
247 label); // label
248 }
impeller::ColorSourceContents::GetCoverage
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.
Definition: color_source_contents.cc:44
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, 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,...
Definition: contents.cc:56
impeller::Geometry::GetCoverage
virtual std::optional< Rect > GetCoverage(const Matrix &transform) const =0
impeller::Vector2
Point Vector2
Definition: point.h:331
impeller::Size
TSize< Scalar > Size
Definition: size.h:171
scale
const Scalar scale
Definition: stroke_path_geometry.cc:316
impeller::Matrix::MakeTranslation
static constexpr Matrix MakeTranslation(const Vector3 &t)
Definition: matrix.h:95
impeller::Matrix::MakeScale
static constexpr Matrix MakeScale(const Vector3 &s)
Definition: matrix.h:104
impeller::TRect::Contains
constexpr bool Contains(const TPoint< Type > &p) const
Returns true iff the provided point |p| is inside the half-open interior of this rectangle.
Definition: rect.h:235

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.

54 {
55 color_filter_ = std::move(color_filter);
56 }

## ◆ SetSamplerDescriptor()

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

Definition at line 50 of file tiled_texture_contents.cc.

50 {
51 sampler_descriptor_ = desc;
52 }

## ◆ SetTexture()

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

Definition at line 40 of file tiled_texture_contents.cc.

40 {
41 texture_ = std::move(texture);
42 }

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.

45 {
46 x_tile_mode_ = x_tile_mode;
47 y_tile_mode_ = y_tile_mode;
48 }

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