| Flutter Impeller |

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

`#include <vertices_contents.h>`

Inheritance diagram for impeller::VerticesSimpleBlendContents:

## Public Types
using | LazyTexture = std::function< std::shared_ptr< Texture >(const ContentContext &renderer)>
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
| VerticesSimpleBlendContents ()
| ~VerticesSimpleBlendContents () override
void | SetGeometry (std::shared_ptr< VerticesGeometry > geometry)
void | SetAlpha (Scalar alpha)
void | SetBlendMode (BlendMode blend_mode)
void | SetTexture (std::shared_ptr< Texture > texture)
void | SetLazyTexture (const LazyTexture &lazy_texture)
void | SetSamplerDescriptor (const SamplerDescriptor &descriptor)
void | SetTileMode (Entity::TileMode tile_mode_x, Entity::TileMode tile_mode_y)
void | SetEffectTransform (Matrix transform)
void | SetLazyTextureCoverage (Rect rect)
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
Static Public Member Functions inherited from impeller::Contents
static std::shared_ptr< Contents > | MakeAnonymous (RenderProc render_proc, CoverageProc coverage_proc)

## Detailed Description

A vertices contents for (optional) per-color vertices + texture and any blend mode.

Definition at line 20 of file vertices_contents.h.

## Member Typedef Documentation

## ◆ LazyTexture

using impeller::VerticesSimpleBlendContents::LazyTexture = std::function<std::shared_ptr<Texture>(const ContentContext& renderer)>

Definition at line 26 of file vertices_contents.h.

## Constructor & Destructor Documentation

## ◆ VerticesSimpleBlendContents()

impeller::VerticesSimpleBlendContents::VerticesSimpleBlendContents | ( |  | ) |

Definition at line 47 of file vertices_contents.cc.

47 {}

## ◆ ~VerticesSimpleBlendContents()

impeller::VerticesSimpleBlendContents::~VerticesSimpleBlendContents | ( |  | ) |
| override

Definition at line 49 of file vertices_contents.cc.

49 {}

## Member Function Documentation

## ◆ GetCoverage()

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

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 68 of file vertices_contents.cc.

69 {
70 return geometry_->GetCoverage(entity.GetTransform());
71 }

References impeller::Entity::GetTransform().

## ◆ Render()

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

Implements impeller::Contents.

Definition at line 97 of file vertices_contents.cc.

99 {
100 FML_DCHECK(texture_ || lazy_texture_ || blend_mode_ == BlendMode::kDst);
101 BlendMode blend_mode = blend_mode_;
102 if (!geometry_->HasVertexColors()) {
103 blend_mode = BlendMode::kSrc;
104 }
105
106 std::shared_ptr<Texture> texture;
107 if (blend_mode != BlendMode::kDst) {
108 if (!texture_) {
109 texture = lazy_texture_(renderer);
110 } else {
111 texture = texture_;
112 }
113 } else {
114 texture = renderer.GetEmptyTexture();
115 }
116 if (!texture) {
117 VALIDATION_LOG << "Missing texture for VerticesSimpleBlendContents";
118 return false;
119 }
120
121 auto dst_sampler_descriptor = descriptor_;
122 dst_sampler_descriptor.width_address_mode =
123 TileModeToAddressMode(tile_mode_x_, renderer.GetDeviceCapabilities())
124 .value_or(SamplerAddressMode::kClampToEdge);
125 dst_sampler_descriptor.height_address_mode =
126 TileModeToAddressMode(tile_mode_y_, renderer.GetDeviceCapabilities())
127 .value_or(SamplerAddressMode::kClampToEdge);
128
129 raw_ptr<const Sampler> dst_sampler =
130 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
131 dst_sampler_descriptor);
132
133 GeometryResult geometry_result = geometry_->GetPositionUVColorBuffer(
134 lazy_texture_coverage_.has_value() ? lazy_texture_coverage_.value()
135 : Rect::MakeSize(texture->GetSize()),
136 inverse_matrix_, renderer, entity, pass);
137 if (geometry_result.vertex_buffer.vertex_count == 0) {
138 return true;
139 }
140 FML_DCHECK(geometry_result.mode == GeometryResult::Mode::kNormal);
141
142 if (blend_mode <= Entity::kLastPipelineBlendMode) {
143 using VS = PorterDuffBlendPipeline::VertexShader;
144 using FS = PorterDuffBlendPipeline::FragmentShader;
145
146 #ifdef IMPELLER_DEBUG
147 pass.SetCommandLabel(SPrintF("DrawVertices Porterduff Blend (%s)",
148 BlendModeToString(blend_mode)));
149 #endif // IMPELLER_DEBUG
150 pass.SetVertexBuffer(std::move(geometry_result.vertex_buffer));
151
152 auto options = OptionsFromPassAndEntity(pass, entity);
153 options.primitive_type = geometry_result.type;
154 auto inverted_blend_mode =
155 InvertPorterDuffBlend(blend_mode).value_or(BlendMode::kSrc);
156 pass.SetPipeline(
157 renderer.GetPorterDuffPipeline(inverted_blend_mode, options));
158
159 FS::BindTextureSamplerDst(pass, texture, dst_sampler);
160
161 VS::FrameInfo frame_info;
162 FS::FragInfo frag_info;
163
164 frame_info.texture_sampler_y_coord_scale = texture->GetYCoordScale();
165 frame_info.mvp = geometry_result.transform;
166
167 frag_info.input_alpha_output_alpha_tmx_tmy =
168 Vector4(1, alpha_, static_cast<int>(tile_mode_x_),
169 static_cast<int>(tile_mode_y_));
170 frag_info.use_strict_source_rect = 0.0;
171
172 auto& host_buffer = renderer.GetTransientsBuffer();
173 FS::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
174 VS::BindFrameInfo(pass, host_buffer.EmplaceUniform(frame_info));
175
176 return pass.Draw().ok();
177 }
178
179 using VS = VerticesUber1Shader::VertexShader;
180 using FS = VerticesUber1Shader::FragmentShader;
181
182 #ifdef IMPELLER_DEBUG
183 pass.SetCommandLabel(SPrintF("DrawVertices Advanced Blend (%s)",
184 BlendModeToString(blend_mode)));
185 #endif // IMPELLER_DEBUG
186 pass.SetVertexBuffer(std::move(geometry_result.vertex_buffer));
187
188 auto options = OptionsFromPassAndEntity(pass, entity);
189 options.primitive_type = geometry_result.type;
190 pass.SetPipeline(renderer.GetDrawVerticesUberPipeline(blend_mode, options));
191
192 FS::BindTextureSampler(pass, texture, dst_sampler);
193
194 VS::FrameInfo frame_info;
195 FS::FragInfo frag_info;
196
197 frame_info.texture_sampler_y_coord_scale = texture->GetYCoordScale();
198 frame_info.mvp = geometry_result.transform;
199 frag_info.alpha = alpha_;
200 frag_info.blend_mode = static_cast<int>(blend_mode);
201
202 // These values are ignored if the platform supports native decal mode.
203 frag_info.tmx = static_cast<int>(tile_mode_x_);
204 frag_info.tmy = static_cast<int>(tile_mode_y_);
205
206 auto& host_buffer = renderer.GetTransientsBuffer();
207 FS::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
208 VS::BindFrameInfo(pass, host_buffer.EmplaceUniform(frame_info));
209
210 return pass.Draw().ok();
211 }
impeller::Entity::kLastPipelineBlendMode
static constexpr BlendMode kLastPipelineBlendMode
Definition: entity.h:28
impeller::RenderPipelineHandle::VertexShader
VertexShader_ VertexShader
Definition: pipeline.h:163
impeller::RenderPipelineHandle::FragmentShader
FragmentShader_ FragmentShader
Definition: pipeline.h:164
impeller::SamplerAddressMode::kClampToEdge
@ kClampToEdge
impeller::BlendModeToString
const char * BlendModeToString(BlendMode blend_mode)
Definition: color.cc:47
impeller::SPrintF
std::string SPrintF(const char *format,...)
Definition: strings.cc:12
impeller::FS
LinePipeline::FragmentShader FS
Definition: line_contents.cc:14
impeller::TileModeToAddressMode
static std::optional< SamplerAddressMode > TileModeToAddressMode(Entity::TileMode tile_mode, const Capabilities &capabilities)
Definition: tiled_texture_contents.cc:16
impeller::InvertPorterDuffBlend
std::optional< BlendMode > InvertPorterDuffBlend(BlendMode blend_mode)
Definition: blend_filter_contents.cc:51
impeller::BlendMode
BlendMode
Definition: color.h:58
impeller::BlendMode::kDst
@ kDst
impeller::BlendMode::kSrc
@ kSrc
impeller::VS
LinePipeline::VertexShader VS
Definition: line_contents.cc:13
impeller::OptionsFromPassAndEntity
ContentContextOptions OptionsFromPassAndEntity(const RenderPass &pass, const Entity &entity)
Definition: contents.cc:34
impeller::GeometryResult::Mode::kNormal
@ kNormal
The geometry has no overlapping triangles.
impeller::SamplerDescriptor::width_address_mode
SamplerAddressMode width_address_mode
Definition: sampler_descriptor.h:19
impeller::TRect< Scalar >::MakeSize
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:150
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:91

References impeller::BlendModeToString(), impeller::RenderPass::Draw(), impeller::ContentContext::GetContext(), impeller::ContentContext::GetDeviceCapabilities(), impeller::ContentContext::GetDrawVerticesUberPipeline(), impeller::ContentContext::GetEmptyTexture(), impeller::ContentContext::GetPorterDuffPipeline(), impeller::ContentContext::GetTransientsBuffer(), impeller::InvertPorterDuffBlend(), impeller::kClampToEdge, impeller::kDst, impeller::Entity::kLastPipelineBlendMode, impeller::GeometryResult::kNormal, impeller::kSrc, impeller::TRect< Scalar >::MakeSize(), impeller::GeometryResult::mode, impeller::OptionsFromPassAndEntity(), impeller::RenderPass::SetCommandLabel(), impeller::RenderPass::SetPipeline(), impeller::RenderPass::SetVertexBuffer(), impeller::SPrintF(), impeller::TileModeToAddressMode(), impeller::GeometryResult::transform, impeller::GeometryResult::type, VALIDATION_LOG, impeller::GeometryResult::vertex_buffer, impeller::VertexBuffer::vertex_count, and impeller::SamplerDescriptor::width_address_mode.

## ◆ SetAlpha()

void impeller::VerticesSimpleBlendContents::SetAlpha | ( | Scalar | alpha | ) |

Definition at line 56 of file vertices_contents.cc.

56 {
57 alpha_ = alpha;
58 }

## ◆ SetBlendMode()

void impeller::VerticesSimpleBlendContents::SetBlendMode | ( | BlendMode | blend_mode | ) |

Definition at line 60 of file vertices_contents.cc.

60 {
61 blend_mode_ = blend_mode;
62 }

## ◆ SetEffectTransform()

void impeller::VerticesSimpleBlendContents::SetEffectTransform | ( | Matrix | transform | ) |

Definition at line 84 of file vertices_contents.cc.

84 {
85 inverse_matrix_ = transform.Invert();
86 }
transform
Matrix transform
Definition: gaussian_blur_filter_contents.cc:214

References transform.

## ◆ SetGeometry()

void impeller::VerticesSimpleBlendContents::SetGeometry | ( | std::shared_ptr< VerticesGeometry > | geometry | ) |

Definition at line 51 of file vertices_contents.cc.

52 {
53 geometry_ = std::move(geometry);
54 }

## ◆ SetLazyTexture()

void impeller::VerticesSimpleBlendContents::SetLazyTexture | ( | const LazyTexture & | lazy_texture | ) |

Definition at line 88 of file vertices_contents.cc.

89 {
90 lazy_texture_ = lazy_texture;
91 }

## ◆ SetLazyTextureCoverage()

void impeller::VerticesSimpleBlendContents::SetLazyTextureCoverage | ( | Rect | rect | ) |

Definition at line 93 of file vertices_contents.cc.

93 {
94 lazy_texture_coverage_ = rect;
95 }

## ◆ SetSamplerDescriptor()

void impeller::VerticesSimpleBlendContents::SetSamplerDescriptor | ( | const SamplerDescriptor & | descriptor | ) |

Definition at line 73 of file vertices_contents.cc.

74 {
75 descriptor_ = descriptor;
76 }

## ◆ SetTexture()

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

Definition at line 64 of file vertices_contents.cc.

64 {
65 texture_ = std::move(texture);
66 }

## ◆ SetTileMode()

void impeller::VerticesSimpleBlendContents::SetTileMode | ( | Entity::TileMode | tile_mode_x,
|  | Entity::TileMode | tile_mode_y
| ) |  |

Definition at line 78 of file vertices_contents.cc.

79 {
80 tile_mode_x_ = tile_mode_x;
81 tile_mode_y_ = tile_mode_y;
82 }

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

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