Flutter Impeller
radial_gradient_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 
6 
10 #include "impeller/entity/entity.h"
14 
15 namespace impeller {
16 
18 
20 
22  center_ = center;
23  radius_ = radius;
24 }
25 
27  tile_mode_ = tile_mode;
28 }
29 
30 void RadialGradientContents::SetColors(std::vector<Color> colors) {
31  colors_ = std::move(colors);
32 }
33 
34 void RadialGradientContents::SetStops(std::vector<Scalar> stops) {
35  stops_ = std::move(stops);
36 }
37 
38 const std::vector<Color>& RadialGradientContents::GetColors() const {
39  return colors_;
40 }
41 
42 const std::vector<Scalar>& RadialGradientContents::GetStops() const {
43  return stops_;
44 }
45 
47  if (GetOpacityFactor() < 1 || tile_mode_ == Entity::TileMode::kDecal) {
48  return false;
49  }
50  for (auto color : colors_) {
51  if (!color.IsOpaque()) {
52  return false;
53  }
54  }
55  return true;
56 }
57 
59  const Entity& entity,
60  RenderPass& pass) const {
61  if (renderer.GetDeviceCapabilities().SupportsSSBO()) {
62  return RenderSSBO(renderer, entity, pass);
63  }
64  return RenderTexture(renderer, entity, pass);
65 }
66 
67 bool RadialGradientContents::RenderSSBO(const ContentContext& renderer,
68  const Entity& entity,
69  RenderPass& pass) const {
72 
73  VS::FrameInfo frame_info;
74  frame_info.matrix = GetInverseEffectTransform();
75 
76  PipelineBuilderCallback pipeline_callback =
77  [&renderer](ContentContextOptions options) {
78  return renderer.GetRadialGradientSSBOFillPipeline(options);
79  };
80  return ColorSourceContents::DrawGeometry<VS>(
81  renderer, entity, pass, pipeline_callback, frame_info,
82  [this, &renderer](RenderPass& pass) {
83  FS::FragInfo frag_info;
84  frag_info.center = center_;
85  frag_info.radius = radius_;
86  frag_info.tile_mode = static_cast<Scalar>(tile_mode_);
87  frag_info.decal_border_color = decal_border_color_;
88  frag_info.alpha = GetOpacityFactor();
89 
90  auto& host_buffer = renderer.GetTransientsBuffer();
91  auto colors = CreateGradientColors(colors_, stops_);
92 
93  frag_info.colors_length = colors.size();
94  auto color_buffer =
95  host_buffer.Emplace(colors.data(), colors.size() * sizeof(StopData),
97 
98  pass.SetCommandLabel("RadialGradientSSBOFill");
99  FS::BindFragInfo(
100  pass, renderer.GetTransientsBuffer().EmplaceUniform(frag_info));
101  FS::BindColorData(pass, color_buffer);
102 
103  return true;
104  });
105 }
106 
107 bool RadialGradientContents::RenderTexture(const ContentContext& renderer,
108  const Entity& entity,
109  RenderPass& pass) const {
112 
113  auto gradient_data = CreateGradientBuffer(colors_, stops_);
114  auto gradient_texture =
115  CreateGradientTexture(gradient_data, renderer.GetContext());
116  if (gradient_texture == nullptr) {
117  return false;
118  }
119 
120  VS::FrameInfo frame_info;
121  frame_info.matrix = GetInverseEffectTransform();
122 
123  PipelineBuilderCallback pipeline_callback =
124  [&renderer](ContentContextOptions options) {
125  return renderer.GetRadialGradientFillPipeline(options);
126  };
127  return ColorSourceContents::DrawGeometry<VS>(
128  renderer, entity, pass, pipeline_callback, frame_info,
129  [this, &renderer, &gradient_texture](RenderPass& pass) {
130  FS::FragInfo frag_info;
131  frag_info.center = center_;
132  frag_info.radius = radius_;
133  frag_info.tile_mode = static_cast<Scalar>(tile_mode_);
134  frag_info.decal_border_color = decal_border_color_;
135  frag_info.texture_sampler_y_coord_scale =
136  gradient_texture->GetYCoordScale();
137  frag_info.alpha = GetOpacityFactor();
138  frag_info.half_texel =
139  Vector2(0.5 / gradient_texture->GetSize().width,
140  0.5 / gradient_texture->GetSize().height);
141 
142  SamplerDescriptor sampler_desc;
143  sampler_desc.min_filter = MinMagFilter::kLinear;
144  sampler_desc.mag_filter = MinMagFilter::kLinear;
145 
146  pass.SetCommandLabel("RadialGradientFill");
147 
148  FS::BindFragInfo(
149  pass, renderer.GetTransientsBuffer().EmplaceUniform(frag_info));
150  FS::BindTextureSampler(
151  pass, gradient_texture,
152  renderer.GetContext()->GetSamplerLibrary()->GetSampler(
153  sampler_desc));
154 
155  return true;
156  });
157 }
158 
160  const ColorFilterProc& color_filter_proc) {
161  for (Color& color : colors_) {
162  color = color_filter_proc(color);
163  }
164  decal_border_color_ = color_filter_proc(decal_border_color_);
165  return true;
166 }
167 
168 } // namespace impeller
impeller::ColorSourceContents::PipelineBuilderCallback
std::function< std::shared_ptr< Pipeline< PipelineDescriptor > >(ContentContextOptions)> PipelineBuilderCallback
Definition: color_source_contents.h:113
impeller::ColorSourceContents::GetOpacityFactor
Scalar GetOpacityFactor() const
Get the opacity factor for this color source.
Definition: color_source_contents.cc:28
impeller::RadialGradientContents::SetCenterAndRadius
void SetCenterAndRadius(Point center, Scalar radius)
Definition: radial_gradient_contents.cc:21
gradient_generator.h
impeller::Scalar
float Scalar
Definition: scalar.h:18
impeller::DefaultUniformAlignment
constexpr size_t DefaultUniformAlignment()
Definition: platform.h:15
impeller::RadialGradientContents::SetStops
void SetStops(std::vector< Scalar > stops)
Definition: radial_gradient_contents.cc:34
entity.h
impeller::RadialGradientContents::GetStops
const std::vector< Scalar > & GetStops() const
Definition: radial_gradient_contents.cc:42
impeller::Color
Definition: color.h:124
impeller::RadialGradientContents::~RadialGradientContents
~RadialGradientContents() override
impeller::Entity::TileMode::kDecal
@ kDecal
impeller::Vector2
Point Vector2
Definition: point.h:320
impeller::RenderPipelineT::FragmentShader
FragmentShader_ FragmentShader
Definition: pipeline.h:94
impeller::Color::alpha
Scalar alpha
Definition: color.h:143
impeller::RadialGradientContents::IsOpaque
bool IsOpaque() const override
Whether this Contents only emits opaque source colors from the fragment stage. This value does not ac...
Definition: radial_gradient_contents.cc:46
gradient.h
impeller::RadialGradientContents::Render
bool Render(const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
Definition: radial_gradient_contents.cc:58
impeller::VS
SolidFillVertexShader VS
Definition: stroke_path_geometry.cc:15
impeller::Entity
Definition: entity.h:21
render_pass.h
impeller::Contents::ColorFilterProc
std::function< Color(Color)> ColorFilterProc
Definition: contents.h:38
impeller::MinMagFilter::kLinear
@ kLinear
impeller::RadialGradientContents::GetColors
const std::vector< Color > & GetColors() const
Definition: radial_gradient_contents.cc:38
geometry.h
clip_contents.h
impeller::CreateGradientBuffer
GradientData CreateGradientBuffer(const std::vector< Color > &colors, const std::vector< Scalar > &stops)
Populate a vector with the interpolated color bytes for the linear gradient described by colors and s...
Definition: gradient.cc:20
impeller::Entity::TileMode
TileMode
Definition: entity.h:42
impeller::RadialGradientContents::RadialGradientContents
RadialGradientContents()
impeller::RadialGradientContents::ApplyColorFilter
bool ApplyColorFilter(const ColorFilterProc &color_filter_proc) override
If possible, applies a color filter to this contents inputs on the CPU.
Definition: radial_gradient_contents.cc:159
impeller::RenderPass
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:33
content_context.h
impeller::ContentContext::GetDeviceCapabilities
const Capabilities & GetDeviceCapabilities() const
Definition: content_context.cc:568
impeller::RadialGradientContents::SetTileMode
void SetTileMode(Entity::TileMode tile_mode)
Definition: radial_gradient_contents.cc:26
impeller::TPoint< Scalar >
impeller::HostBuffer::EmplaceUniform
BufferView EmplaceUniform(const UniformType &uniform)
Emplace uniform data onto the host buffer. Ensure that backend specific uniform alignment requirement...
Definition: host_buffer.h:50
impeller::ContentContext::GetRadialGradientSSBOFillPipeline
std::shared_ptr< Pipeline< PipelineDescriptor > > GetRadialGradientSSBOFillPipeline(ContentContextOptions opts) const
Definition: content_context.h:438
radial_gradient_contents.h
impeller::CreateGradientColors
std::vector< StopData > CreateGradientColors(const std::vector< Color > &colors, const std::vector< Scalar > &stops)
Populate a vector with the color and stop data for a gradient.
Definition: gradient_generator.cc:45
impeller::CreateGradientTexture
std::shared_ptr< Texture > CreateGradientTexture(const GradientData &gradient_data, const std::shared_ptr< impeller::Context > &context)
Create a host visible texture that contains the gradient defined by the provided gradient data.
Definition: gradient_generator.cc:17
impeller::RenderPipelineT::VertexShader
VertexShader_ VertexShader
Definition: pipeline.h:93
impeller::ContentContextOptions
Definition: content_context.h:288
impeller::Capabilities::SupportsSSBO
virtual bool SupportsSSBO() const =0
Whether the context backend supports binding Shader Storage Buffer Objects (SSBOs) to pipelines.
impeller::RadialGradientContents::SetColors
void SetColors(std::vector< Color > colors)
Definition: radial_gradient_contents.cc:30
impeller
Definition: aiks_blur_unittests.cc:20
impeller::ContentContext
Definition: content_context.h:392
impeller::ColorSourceContents::GetInverseEffectTransform
const Matrix & GetInverseEffectTransform() const
Set the inverted effect transform for this color source.
Definition: color_source_contents.cc:36
impeller::ContentContext::GetTransientsBuffer
HostBuffer & GetTransientsBuffer() const
Retrieve the currnent host buffer for transient storage.
Definition: content_context.h:833