| Flutter Impeller |

filter_contents.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "impeller/entity/contents/filters/filter_contents.h"
6
7 #include <algorithm>
8 #include <cmath>
9 #include <cstddef>
10 #include <memory>
11 #include <optional>
12 #include <tuple>
13 #include <utility>
14
15 #include "flutter/fml/logging.h"
16 #include "impeller/core/formats.h"
17 #include "impeller/entity/contents/content_context.h"
18 #include "impeller/entity/contents/filters/border_mask_blur_filter_contents.h"
19 #include "impeller/entity/contents/filters/gaussian_blur_filter_contents.h"
20 #include "impeller/entity/contents/filters/inputs/filter_input.h"
21 #include "impeller/entity/contents/filters/local_matrix_filter_contents.h"
22 #include "impeller/entity/contents/filters/matrix_filter_contents.h"
23 #include "impeller/entity/contents/filters/morphology_filter_contents.h"
24 #include "impeller/entity/contents/filters/runtime_effect_filter_contents.h"
25 #include "impeller/entity/contents/filters/yuv_to_rgb_filter_contents.h"
26 #include "impeller/entity/contents/texture_contents.h"
27 #include "impeller/entity/entity.h"
28 #include "impeller/geometry/path_builder.h"
29 #include "impeller/renderer/command_buffer.h"
30 #include "impeller/renderer/render_pass.h"
31 #include "impeller/runtime_stage/runtime_stage.h"
32
33 namespace impeller {
34
35 const int32_t FilterContents::kBlurFilterRequiredMipCount =
36 GaussianBlurFilterContents::kBlurFilterRequiredMipCount;
37
38 std::shared_ptr<FilterContents> FilterContents::MakeGaussianBlur(
39 const FilterInput::Ref& input,
40 Sigma sigma_x,
41 Sigma sigma_y,
42 Entity::TileMode tile_mode,
43 FilterContents::BlurStyle mask_blur_style,
44 const Geometry* mask_geometry) {
45 auto blur = std::make_shared<GaussianBlurFilterContents>(
46 sigma_x.sigma, sigma_y.sigma, tile_mode, mask_blur_style, mask_geometry);
47 blur->SetInputs({input});
48 return blur;
49 }
50
51 std::shared_ptr<FilterContents> FilterContents::MakeBorderMaskBlur(
52 FilterInput::Ref input,
53 Sigma sigma_x,
54 Sigma sigma_y,
55 BlurStyle blur_style) {
56 auto filter = std::make_shared<BorderMaskBlurFilterContents>();
57 filter->SetInputs({std::move(input)});
58 filter->SetSigma(sigma_x, sigma_y);
59 filter->SetBlurStyle(blur_style);
60 return filter;
61 }
62
63 std::shared_ptr<FilterContents> FilterContents::MakeDirectionalMorphology(
64 FilterInput::Ref input,
65 Radius radius,
66 Vector2 direction,
67 MorphType morph_type) {
68 auto filter = std::make_shared<DirectionalMorphologyFilterContents>();
69 filter->SetInputs({std::move(input)});
70 filter->SetRadius(radius);
71 filter->SetDirection(direction);
72 filter->SetMorphType(morph_type);
73 return filter;
74 }
75
76 std::shared_ptr<FilterContents> FilterContents::MakeMorphology(
77 FilterInput::Ref input,
78 Radius radius_x,
79 Radius radius_y,
80 MorphType morph_type) {
81 auto x_morphology = MakeDirectionalMorphology(std::move(input), radius_x,
82 Point(1, 0), morph_type);
83 auto y_morphology = MakeDirectionalMorphology(
84 FilterInput::Make(x_morphology), radius_y, Point(0, 1), morph_type);
85 return y_morphology;
86 }
87
88 std::shared_ptr<FilterContents> FilterContents::MakeMatrixFilter(
89 FilterInput::Ref input,
90 const Matrix& matrix,
91 const SamplerDescriptor& desc) {
92 auto filter = std::make_shared<MatrixFilterContents>();
93 filter->SetInputs({std::move(input)});
94 filter->SetMatrix(matrix);
95 filter->SetSamplerDescriptor(desc);
96 return filter;
97 }
98
99 std::shared_ptr<FilterContents> FilterContents::MakeLocalMatrixFilter(
100 FilterInput::Ref input,
101 const Matrix& matrix) {
102 auto filter = std::make_shared<LocalMatrixFilterContents>();
103 filter->SetInputs({std::move(input)});
104 filter->SetMatrix(matrix);
105 return filter;
106 }
107
108 std::shared_ptr<FilterContents> FilterContents::MakeYUVToRGBFilter(
109 std::shared_ptr<Texture> y_texture,
110 std::shared_ptr<Texture> uv_texture,
111 YUVColorSpace yuv_color_space) {
112 auto filter = std::make_shared<impeller::YUVToRGBFilterContents>();
113 filter->SetInputs({impeller::FilterInput::Make(y_texture),
114 impeller::FilterInput::Make(uv_texture)});
115 filter->SetYUVColorSpace(yuv_color_space);
116 return filter;
117 }
118
119 std::shared_ptr<FilterContents> FilterContents::MakeRuntimeEffect(
120 FilterInput::Ref input,
121 std::shared_ptr<RuntimeStage> runtime_stage,
122 std::shared_ptr<std::vector<uint8_t>> uniforms,
123 std::vector<RuntimeEffectContents::TextureInput> texture_inputs) {
124 auto filter = std::make_shared<impeller::RuntimeEffectFilterContents>();
125 filter->SetInputs({std::move(input)});
126 filter->SetRuntimeStage(std::move(runtime_stage));
127 filter->SetUniforms(std::move(uniforms));
128 filter->SetTextureInputs(std::move(texture_inputs));
129 return filter;
130 }
131
132 FilterContents::FilterContents() = default;
133
134 FilterContents::~FilterContents() = default;
135
136 void FilterContents::SetInputs(FilterInput::Vector inputs) {
137 inputs_ = std::move(inputs);
138 }
139
140 void FilterContents::SetEffectTransform(const Matrix& effect_transform) {
141 effect_transform_ = effect_transform;
142
143 for (auto& input : inputs_) {
144 input->SetEffectTransform(effect_transform);
145 }
146 }
147
148 bool FilterContents::Render(const ContentContext& renderer,
149 const Entity& entity,
150 RenderPass& pass) const {
151 auto filter_coverage = GetCoverage(entity);
152 if (!filter_coverage.has_value()) {
153 return true;
154 }
155
156 // Run the filter.
157
158 auto maybe_entity = GetEntity(renderer, entity, GetCoverageHint());
159 if (!maybe_entity.has_value()) {
160 return true;
161 }
162 maybe_entity->SetClipDepth(entity.GetClipDepth());
163 return maybe_entity->Render(renderer, pass);
164 }
165
166 std::optional<Rect> FilterContents::GetLocalCoverage(
167 const Entity& local_entity) const {
168 auto coverage = GetFilterCoverage(inputs_, local_entity, effect_transform_);
169 auto coverage_hint = GetCoverageHint();
170 if (coverage_hint.has_value() && coverage.has_value()) {
171 coverage = coverage->Intersection(coverage_hint.value());
172 }
173
174 return coverage;
175 }
176
177 std::optional<Rect> FilterContents::GetCoverage(const Entity& entity) const {
178 Entity entity_with_local_transform = entity.Clone();
179 entity_with_local_transform.SetTransform(GetTransform(entity.GetTransform()));
180
181 return GetLocalCoverage(entity_with_local_transform);
182 }
183
184 std::optional<Rect> FilterContents::GetFilterCoverage(
185 const FilterInput::Vector& inputs,
186 const Entity& entity,
187 const Matrix& effect_transform) const {
188 // The default coverage of FilterContents is just the union of its inputs'
189 // coverage. FilterContents implementations may choose to adjust this
190 // coverage depending on the use case.
191
192 if (inputs_.empty()) {
193 return std::nullopt;
194 }
195
196 std::optional<Rect> result;
197 for (const auto& input : inputs) {
198 auto coverage = input->GetCoverage(entity);
199 if (!coverage.has_value()) {
200 continue;
201 }
202 if (!result.has_value()) {
203 result = coverage;
204 continue;
205 }
206 result = result->Union(coverage.value());
207 }
208 return result;
209 }
210
211 std::optional<Rect> FilterContents::GetSourceCoverage(
212 const Matrix& effect_transform,
213 const Rect& output_limit) const {
214 auto filter_input_coverage =
215 GetFilterSourceCoverage(effect_transform_, output_limit);
216
217 if (!filter_input_coverage.has_value()) {
218 return std::nullopt;
219 }
220
221 std::optional<Rect> inputs_coverage;
222 for (const auto& input : inputs_) {
223 auto input_coverage = input->GetSourceCoverage(
224 effect_transform, filter_input_coverage.value());
225 if (!input_coverage.has_value()) {
226 return std::nullopt;
227 }
228 inputs_coverage = Rect::Union(inputs_coverage, input_coverage.value());
229 }
230 return inputs_coverage;
231 }
232
233 std::optional<Entity> FilterContents::GetEntity(
234 const ContentContext& renderer,
235 const Entity& entity,
236 const std::optional<Rect>& coverage_hint) const {
237 Entity entity_with_local_transform = entity.Clone();
238 entity_with_local_transform.SetTransform(GetTransform(entity.GetTransform()));
239
240 auto coverage = GetLocalCoverage(entity_with_local_transform);
241 if (!coverage.has_value() || coverage->IsEmpty()) {
242 return std::nullopt;
243 }
244
245 return RenderFilter(inputs_, renderer, entity_with_local_transform,
246 effect_transform_, coverage.value(), coverage_hint);
247 }
248
249 std::optional<Snapshot> FilterContents::RenderToSnapshot(
250 const ContentContext& renderer,
251 const Entity& entity,
252 std::optional<Rect> coverage_limit,
253 const std::optional<SamplerDescriptor>& sampler_descriptor,
254 bool msaa_enabled,
255 int32_t mip_count,
256 std::string_view label) const {
257 // Resolve the render instruction (entity) from the filter and render it to a
258 // snapshot.
259 if (std::optional<Entity> result =
260 GetEntity(renderer, entity, coverage_limit);
261 result.has_value()) {
262 return result->GetContents()->RenderToSnapshot(
263 renderer, // renderer
264 result.value(), // entity
265 coverage_limit, // coverage_limit
266 std::nullopt, // sampler_descriptor
267 true, // msaa_enabled
268 /*mip_count=*/mip_count,
269 label // label
270 );
271 }
272
273 return std::nullopt;
274 }
275
276 Matrix FilterContents::GetLocalTransform(const Matrix& parent_transform) const {
277 return Matrix();
278 }
279
280 Matrix FilterContents::GetTransform(const Matrix& parent_transform) const {
281 return parent_transform * GetLocalTransform(parent_transform);
282 }
283
284 void FilterContents::SetRenderingMode(Entity::RenderingMode rendering_mode) {
285 for (auto& input : inputs_) {
286 input->SetRenderingMode(rendering_mode);
287 }
288 }
289
290 } // namespace impeller
border_mask_blur_filter_contents.h
impeller::ContentContext
Definition: content_context.h:371
impeller::Contents::GetCoverageHint
const std::optional< Rect > & GetCoverageHint() const
Definition: contents.cc:140
impeller::Entity
Definition: entity.h:20
impeller::Entity::SetTransform
void SetTransform(const Matrix &transform)
Set the global transform matrix for this Entity.
Definition: entity.cc:60
impeller::Entity::TileMode
TileMode
Definition: entity.h:42
impeller::Entity::RenderingMode
RenderingMode
Definition: entity.h:27
impeller::Entity::Clone
Entity Clone() const
Definition: entity.cc:159
impeller::Entity::GetTransform
const Matrix & GetTransform() const
Get the global transform matrix for this Entity.
Definition: entity.cc:44
impeller::Entity::GetClipDepth
uint32_t GetClipDepth() const
Definition: entity.cc:84
impeller::FilterContents::kBlurFilterRequiredMipCount
static const int32_t kBlurFilterRequiredMipCount
Definition: filter_contents.h:26
impeller::FilterContents::BlurStyle
BlurStyle
Definition: filter_contents.h:28
impeller::FilterContents::GetEntity
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.
Definition: filter_contents.cc:233
impeller::FilterContents::MakeDirectionalMorphology
static std::shared_ptr< FilterContents > MakeDirectionalMorphology(FilterInput::Ref input, Radius radius, Vector2 direction, MorphType morph_type)
Definition: filter_contents.cc:63
impeller::FilterContents::FilterContents
FilterContents()
impeller::FilterContents::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: filter_contents.cc:177
impeller::FilterContents::~FilterContents
~FilterContents() override
impeller::FilterContents::GetTransform
Matrix GetTransform(const Matrix &parent_transform) const
Definition: filter_contents.cc:280
impeller::FilterContents::MorphType
MorphType
Definition: filter_contents.h:39
impeller::FilterContents::Render
bool Render(const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
Definition: filter_contents.cc:148
impeller::FilterContents::MakeMorphology
static std::shared_ptr< FilterContents > MakeMorphology(FilterInput::Ref input, Radius radius_x, Radius radius_y, MorphType morph_type)
Definition: filter_contents.cc:76
impeller::FilterContents::MakeBorderMaskBlur
static std::shared_ptr< FilterContents > MakeBorderMaskBlur(FilterInput::Ref input, Sigma sigma_x, Sigma sigma_y, BlurStyle blur_style=BlurStyle::kNormal)
Definition: filter_contents.cc:51
impeller::FilterContents::MakeLocalMatrixFilter
static std::shared_ptr< FilterContents > MakeLocalMatrixFilter(FilterInput::Ref input, const Matrix &matrix)
Definition: filter_contents.cc:99
impeller::FilterContents::MakeGaussianBlur
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)
Definition: filter_contents.cc:38
impeller::FilterContents::SetInputs
void SetInputs(FilterInput::Vector inputs)
The input texture sources for this filter. Each input's emitted texture is expected to have premultip...
Definition: filter_contents.cc:136
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
impeller::FilterContents::GetSourceCoverage
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 |ou...
Definition: filter_contents.cc:211
impeller::FilterContents::SetEffectTransform
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...
Definition: filter_contents.cc:140
impeller::FilterContents::MakeMatrixFilter
static std::shared_ptr< FilterContents > MakeMatrixFilter(FilterInput::Ref input, const Matrix &matrix, const SamplerDescriptor &desc)
Definition: filter_contents.cc:88
impeller::FilterContents::RenderToSnapshot
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,...
Definition: filter_contents.cc:249
impeller::FilterContents::MakeYUVToRGBFilter
static std::shared_ptr< FilterContents > MakeYUVToRGBFilter(std::shared_ptr< Texture > y_texture, std::shared_ptr< Texture > uv_texture, YUVColorSpace yuv_color_space)
Definition: filter_contents.cc:108
impeller::FilterContents::MakeRuntimeEffect
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)
Definition: filter_contents.cc:119
impeller::FilterContents::GetLocalTransform
virtual Matrix GetLocalTransform(const Matrix &parent_transform) const
Definition: filter_contents.cc:276
impeller::FilterInput::Ref
std::shared_ptr< FilterInput > Ref
Definition: filter_input.h:32
impeller::FilterInput::Make
static FilterInput::Ref Make(Variant input, bool msaa_enabled=true)
Definition: filter_input.cc:19
impeller::FilterInput::Vector
std::vector< FilterInput::Ref > Vector
Definition: filter_input.h:33
impeller::Geometry
Definition: geometry.h:50
impeller::RenderPass
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:30
command_buffer.h
content_context.h
formats.h
entity.h
filter_contents.h
filter_input.h
gaussian_blur_filter_contents.h
path_builder.h
local_matrix_filter_contents.h
matrix_filter_contents.h
morphology_filter_contents.h
impeller
Definition: allocation.cc:12
impeller::YUVColorSpace
YUVColorSpace
Definition: color.h:54
impeller::Point
TPoint< Scalar > Point
Definition: point.h:327
render_pass.h
runtime_effect_filter_contents.h
runtime_stage.h
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37
impeller::Radius
For convolution filters, the "radius" is the size of the convolution kernel to use on the local space...
Definition: sigma.h:48
impeller::SamplerDescriptor
Definition: sampler_descriptor.h:14
impeller::Sigma
In filters that use Gaussian distributions, "sigma" is a size of one standard deviation in terms of t...
Definition: sigma.h:32
impeller::Sigma::sigma
Scalar sigma
Definition: sigma.h:33
impeller::TPoint< Scalar >
impeller::TRect< Scalar >
impeller::TRect< Scalar >::Union
constexpr TRect Union(const TRect &o) const
Definition: rect.h:517
texture_contents.h
yuv_to_rgb_filter_contents.h