| 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/renderer/command_buffer.h"
29 #include "impeller/renderer/render_pass.h"
30 #include "impeller/runtime_stage/runtime_stage.h"
31
32 namespace impeller {
33
34 const int32_t FilterContents::kBlurFilterRequiredMipCount =
35 GaussianBlurFilterContents::kBlurFilterRequiredMipCount;
36
37 std::shared_ptr<FilterContents> FilterContents::MakeGaussianBlur(
38 const FilterInput::Ref& input,
39 Sigma sigma_x,
40 Sigma sigma_y,
41 Entity::TileMode tile_mode,
42 FilterContents::BlurStyle mask_blur_style,
43 const Geometry* mask_geometry) {
44 auto blur = std::make_shared<GaussianBlurFilterContents>(
45 sigma_x.sigma, sigma_y.sigma, tile_mode, mask_blur_style, mask_geometry);
46 blur->SetInputs({input});
47 return blur;
48 }
49
50 std::shared_ptr<FilterContents> FilterContents::MakeBorderMaskBlur(
51 FilterInput::Ref input,
52 Sigma sigma_x,
53 Sigma sigma_y,
54 BlurStyle blur_style) {
55 auto filter = std::make_shared<BorderMaskBlurFilterContents>();
56 filter->SetInputs({std::move(input)});
57 filter->SetSigma(sigma_x, sigma_y);
58 filter->SetBlurStyle(blur_style);
59 return filter;
60 }
61
62 std::shared_ptr<FilterContents> FilterContents::MakeDirectionalMorphology(
63 FilterInput::Ref input,
64 Radius radius,
65 Vector2 direction,
66 MorphType morph_type) {
67 auto filter = std::make_shared<DirectionalMorphologyFilterContents>();
68 filter->SetInputs({std::move(input)});
69 filter->SetRadius(radius);
70 filter->SetDirection(direction);
71 filter->SetMorphType(morph_type);
72 return filter;
73 }
74
75 std::shared_ptr<FilterContents> FilterContents::MakeMorphology(
76 FilterInput::Ref input,
77 Radius radius_x,
78 Radius radius_y,
79 MorphType morph_type) {
80 auto x_morphology = MakeDirectionalMorphology(std::move(input), radius_x,
81 Point(1, 0), morph_type);
82 auto y_morphology = MakeDirectionalMorphology(
83 FilterInput::Make(x_morphology), radius_y, Point(0, 1), morph_type);
84 return y_morphology;
85 }
86
87 std::shared_ptr<FilterContents> FilterContents::MakeMatrixFilter(
88 FilterInput::Ref input,
89 const Matrix& matrix,
90 const SamplerDescriptor& desc) {
91 auto filter = std::make_shared<MatrixFilterContents>();
92 filter->SetInputs({std::move(input)});
93 filter->SetMatrix(matrix);
94 filter->SetSamplerDescriptor(desc);
95 return filter;
96 }
97
98 std::shared_ptr<FilterContents> FilterContents::MakeLocalMatrixFilter(
99 FilterInput::Ref input,
100 const Matrix& matrix) {
101 auto filter = std::make_shared<LocalMatrixFilterContents>();
102 filter->SetInputs({std::move(input)});
103 filter->SetMatrix(matrix);
104 return filter;
105 }
106
107 std::shared_ptr<FilterContents> FilterContents::MakeYUVToRGBFilter(
108 std::shared_ptr<Texture> y_texture,
109 std::shared_ptr<Texture> uv_texture,
110 YUVColorSpace yuv_color_space) {
111 auto filter = std::make_shared<impeller::YUVToRGBFilterContents>();
112 filter->SetInputs({impeller::FilterInput::Make(y_texture),
113 impeller::FilterInput::Make(uv_texture)});
114 filter->SetYUVColorSpace(yuv_color_space);
115 return filter;
116 }
117
118 std::shared_ptr<FilterContents> FilterContents::MakeRuntimeEffect(
119 FilterInput::Ref input,
120 std::shared_ptr<RuntimeStage> runtime_stage,
121 std::shared_ptr<std::vector<uint8_t>> uniforms,
122 std::vector<RuntimeEffectContents::TextureInput> texture_inputs) {
123 auto filter = std::make_shared<impeller::RuntimeEffectFilterContents>();
124 filter->SetInputs({std::move(input)});
125 filter->SetRuntimeStage(std::move(runtime_stage));
126 filter->SetUniforms(std::move(uniforms));
127 filter->SetTextureInputs(std::move(texture_inputs));
128 return filter;
129 }
130
131 FilterContents::FilterContents() = default;
132
133 FilterContents::~FilterContents() = default;
134
135 void FilterContents::SetInputs(FilterInput::Vector inputs) {
136 inputs_ = std::move(inputs);
137 }
138
139 void FilterContents::SetEffectTransform(const Matrix& effect_transform) {
140 effect_transform_ = effect_transform;
141
142 for (auto& input : inputs_) {
143 input->SetEffectTransform(effect_transform);
144 }
145 }
146
147 bool FilterContents::Render(const ContentContext& renderer,
148 const Entity& entity,
149 RenderPass& pass) const {
150 auto filter_coverage = GetCoverage(entity);
151 if (!filter_coverage.has_value()) {
152 return true;
153 }
154
155 // Run the filter.
156
157 auto maybe_entity = GetEntity(renderer, entity, GetCoverageHint());
158 if (!maybe_entity.has_value()) {
159 return true;
160 }
161 maybe_entity->SetClipDepth(entity.GetClipDepth());
162 return maybe_entity->Render(renderer, pass);
163 }
164
165 std::optional<Rect> FilterContents::GetLocalCoverage(
166 const Entity& local_entity) const {
167 auto coverage = GetFilterCoverage(inputs_, local_entity, effect_transform_);
168 auto coverage_hint = GetCoverageHint();
169 if (coverage_hint.has_value() && coverage.has_value()) {
170 coverage = coverage->Intersection(coverage_hint.value());
171 }
172
173 return coverage;
174 }
175
176 std::optional<Rect> FilterContents::GetCoverage(const Entity& entity) const {
177 Entity entity_with_local_transform = entity.Clone();
178 entity_with_local_transform.SetTransform(GetTransform(entity.GetTransform()));
179
180 return GetLocalCoverage(entity_with_local_transform);
181 }
182
183 std::optional<Rect> FilterContents::GetFilterCoverage(
184 const FilterInput::Vector& inputs,
185 const Entity& entity,
186 const Matrix& effect_transform) const {
187 // The default coverage of FilterContents is just the union of its inputs'
188 // coverage. FilterContents implementations may choose to adjust this
189 // coverage depending on the use case.
190
191 if (inputs_.empty()) {
192 return std::nullopt;
193 }
194
195 std::optional<Rect> result;
196 for (const auto& input : inputs) {
197 auto coverage = input->GetCoverage(entity);
198 if (!coverage.has_value()) {
199 continue;
200 }
201 if (!result.has_value()) {
202 result = coverage;
203 continue;
204 }
205 result = result->Union(coverage.value());
206 }
207 return result;
208 }
209
210 std::optional<Rect> FilterContents::GetSourceCoverage(
211 const Matrix& effect_transform,
212 const Rect& output_limit) const {
213 auto filter_input_coverage =
214 GetFilterSourceCoverage(effect_transform_, output_limit);
215
216 if (!filter_input_coverage.has_value()) {
217 return std::nullopt;
218 }
219
220 std::optional<Rect> inputs_coverage;
221 for (const auto& input : inputs_) {
222 auto input_coverage = input->GetSourceCoverage(
223 effect_transform, filter_input_coverage.value());
224 if (!input_coverage.has_value()) {
225 return std::nullopt;
226 }
227 inputs_coverage = Rect::Union(inputs_coverage, input_coverage.value());
228 }
229 return inputs_coverage;
230 }
231
232 std::optional<Entity> FilterContents::GetEntity(
233 const ContentContext& renderer,
234 const Entity& entity,
235 const std::optional<Rect>& coverage_hint) const {
236 Entity entity_with_local_transform = entity.Clone();
237 entity_with_local_transform.SetTransform(GetTransform(entity.GetTransform()));
238
239 std::optional<Rect> coverage = GetLocalCoverage(entity_with_local_transform);
240 if (!coverage.has_value() || coverage->IsEmpty()) {
241 return std::nullopt;
242 }
243
244 return RenderFilter(inputs_, //
245 renderer, //
246 entity_with_local_transform, //
247 effect_transform_, //
248 coverage.value(), //
249 coverage_hint //
250 );
251 }
252
253 std::optional<Snapshot> FilterContents::RenderToSnapshot(
254 const ContentContext& renderer,
255 const Entity& entity,
256 std::optional<Rect> coverage_limit,
257 const std::optional<SamplerDescriptor>& sampler_descriptor,
258 bool msaa_enabled,
259 int32_t mip_count,
260 std::string_view label) const {
261 // Resolve the render instruction (entity) from the filter and render it to a
262 // snapshot.
263 if (std::optional<Entity> result =
264 GetEntity(renderer, entity, coverage_limit);
265 result.has_value()) {
266 return result->GetContents()->RenderToSnapshot(
267 renderer, // renderer
268 result.value(), // entity
269 coverage_limit, // coverage_limit
270 std::nullopt, // sampler_descriptor
271 true, // msaa_enabled
272 /*mip_count=*/mip_count,
273 label // label
274 );
275 }
276
277 return std::nullopt;
278 }
279
280 Matrix FilterContents::GetLocalTransform(const Matrix& parent_transform) const {
281 return Matrix();
282 }
283
284 Matrix FilterContents::GetTransform(const Matrix& parent_transform) const {
285 return parent_transform * GetLocalTransform(parent_transform);
286 }
287
288 void FilterContents::SetRenderingMode(Entity::RenderingMode rendering_mode) {
289 for (auto& input : inputs_) {
290 input->SetRenderingMode(rendering_mode);
291 }
292 }
293
294 } // namespace impeller
border_mask_blur_filter_contents.h
impeller::ContentContext
Definition: content_context.h:138
impeller::Contents::GetCoverageHint
const std::optional< Rect > & GetCoverageHint() const
Definition: contents.cc:140
impeller::Entity
Definition: entity.h:26
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:48
impeller::Entity::RenderingMode
RenderingMode
Definition: entity.h:33
impeller::Entity::Clone
Entity Clone() const
Definition: entity.cc:158
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:232
impeller::FilterContents::MakeDirectionalMorphology
static std::shared_ptr< FilterContents > MakeDirectionalMorphology(FilterInput::Ref input, Radius radius, Vector2 direction, MorphType morph_type)
Definition: filter_contents.cc:62
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:176
impeller::FilterContents::~FilterContents
~FilterContents() override
impeller::FilterContents::GetTransform
Matrix GetTransform(const Matrix &parent_transform) const
Definition: filter_contents.cc:284
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:147
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:75
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:50
impeller::FilterContents::MakeLocalMatrixFilter
static std::shared_ptr< FilterContents > MakeLocalMatrixFilter(FilterInput::Ref input, const Matrix &matrix)
Definition: filter_contents.cc:98
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:37
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:135
impeller::FilterContents::SetRenderingMode
virtual void SetRenderingMode(Entity::RenderingMode rendering_mode)
Marks this filter chain as applying in a subpass scenario.
Definition: filter_contents.cc:288
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:210
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:139
impeller::FilterContents::MakeMatrixFilter
static std::shared_ptr< FilterContents > MakeMatrixFilter(FilterInput::Ref input, const Matrix &matrix, const SamplerDescriptor &desc)
Definition: filter_contents.cc:87
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:253
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:107
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:118
impeller::FilterContents::GetLocalTransform
virtual Matrix GetLocalTransform(const Matrix &parent_transform) const
Definition: filter_contents.cc:280
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
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:513
texture_contents.h
yuv_to_rgb_filter_contents.h