| Flutter Impeller |

color_matrix_filter_contents.cc
Go to the documentation of this file.
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/color_matrix_filter_contents.h"
6
7 #include <optional>
8
9 #include "impeller/entity/contents/anonymous_contents.h"
10 #include "impeller/entity/contents/content_context.h"
11 #include "impeller/entity/contents/contents.h"
12 #include "impeller/entity/contents/filters/color_filter_contents.h"
13 #include "impeller/geometry/point.h"
14 #include "impeller/geometry/vector.h"
15 #include "impeller/renderer/render_pass.h"
16 #include "impeller/renderer/vertex_buffer_builder.h"
17
18 namespace impeller {
19
20 ColorMatrixFilterContents::ColorMatrixFilterContents() = default;
21
22 ColorMatrixFilterContents::~ColorMatrixFilterContents() = default;
23
24 void ColorMatrixFilterContents::SetMatrix(const ColorMatrix& matrix) {
25 matrix_ = matrix;
26 }
27
28 std::optional<Entity> ColorMatrixFilterContents::RenderFilter(
29 const FilterInput::Vector& inputs,
30 const ContentContext& renderer,
31 const Entity& entity,
32 const Matrix& effect_transform,
33 const Rect& coverage,
34 const std::optional<Rect>& coverage_hint) const {
35 using VS = ColorMatrixColorFilterPipeline::VertexShader;
36 using FS = ColorMatrixColorFilterPipeline::FragmentShader;
37
38 //----------------------------------------------------------------------------
39 /// Handle inputs.
40 ///
41
42 if (inputs.empty()) {
43 return std::nullopt;
44 }
45
46 auto input_snapshot = inputs[0]->GetSnapshot("ColorMatrix", renderer, entity);
47 if (!input_snapshot.has_value()) {
48 return std::nullopt;
49 }
50
51 //----------------------------------------------------------------------------
52 /// Create AnonymousContents for rendering.
53 ///
54 RenderProc render_proc = [input_snapshot, color_matrix = matrix_,
55 absorb_opacity = GetAbsorbOpacity()](
56 const ContentContext& renderer,
57 const Entity& entity, RenderPass& pass) -> bool {
58 pass.SetCommandLabel("Color Matrix Filter");
59 pass.SetStencilReference(entity.GetClipDepth());
60
61 auto options = OptionsFromPassAndEntity(pass, entity);
62 options.primitive_type = PrimitiveType::kTriangleStrip;
63 pass.SetPipeline(renderer.GetColorMatrixColorFilterPipeline(options));
64
65 auto size = input_snapshot->texture->GetSize();
66
67 VertexBufferBuilder<VS::PerVertexData> vtx_builder;
68 vtx_builder.AddVertices({
69 {Point(0, 0)},
70 {Point(1, 0)},
71 {Point(0, 1)},
72 {Point(1, 1)},
73 });
74 auto& host_buffer = renderer.GetTransientsBuffer();
75 pass.SetVertexBuffer(vtx_builder.CreateVertexBuffer(host_buffer));
76
77 VS::FrameInfo frame_info;
78 frame_info.mvp = Entity::GetShaderTransform(
79 entity.GetShaderClipDepth(), pass,
80 entity.GetTransform() * input_snapshot->transform *
81 Matrix::MakeScale(Vector2(size)));
82 frame_info.texture_sampler_y_coord_scale =
83 input_snapshot->texture->GetYCoordScale();
84
85 FS::FragInfo frag_info;
86 const float* matrix = color_matrix.array;
87 frag_info.color_v = Vector4(matrix[4], matrix[9], matrix[14], matrix[19]);
88 // clang-format off
89 frag_info.color_m = Matrix(
90 matrix[0], matrix[5], matrix[10], matrix[15],
91 matrix[1], matrix[6], matrix[11], matrix[16],
92 matrix[2], matrix[7], matrix[12], matrix[17],
93 matrix[3], matrix[8], matrix[13], matrix[18]
94 );
95 // clang-format on
96 frag_info.input_alpha =
97 absorb_opacity == ColorFilterContents::AbsorbOpacity::kYes
98 ? input_snapshot->opacity
99 : 1.0f;
100 const std::unique_ptr<const Sampler>& sampler =
101 renderer.GetContext()->GetSamplerLibrary()->GetSampler({});
102 FS::BindInputTexture(pass, input_snapshot->texture, sampler);
103 FS::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
104
105 VS::BindFrameInfo(pass, host_buffer.EmplaceUniform(frame_info));
106
107 return pass.Draw().ok();
108 };
109
110 CoverageProc coverage_proc =
111 [coverage](const Entity& entity) -> std::optional<Rect> {
112 return coverage.TransformBounds(entity.GetTransform());
113 };
114
115 auto contents = AnonymousContents::Make(render_proc, coverage_proc);
116
117 Entity sub_entity;
118 sub_entity.SetContents(std::move(contents));
119 sub_entity.SetClipDepth(entity.GetClipDepth());
120 sub_entity.SetBlendMode(entity.GetBlendMode());
121 return sub_entity;
122 }
123
124 } // namespace impeller
impeller::Entity::GetShaderTransform
Matrix GetShaderTransform(const RenderPass &pass) const
Get the vertex shader transform used for drawing this Entity.
Definition: entity.cc:53
contents.h
color_matrix_filter_contents.h
point.h
impeller::TRect::TransformBounds
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:405
impeller::Vector2
Point Vector2
Definition: point.h:320
impeller::RenderPipelineT::FragmentShader
FragmentShader_ FragmentShader
Definition: pipeline.h:94
impeller::ColorMatrixFilterContents::~ColorMatrixFilterContents
~ColorMatrixFilterContents() override
impeller::ColorMatrixFilterContents::SetMatrix
void SetMatrix(const ColorMatrix &matrix)
Definition: color_matrix_filter_contents.cc:24
impeller::VS
SolidFillVertexShader VS
Definition: stroke_path_geometry.cc:15
impeller::Entity
Definition: entity.h:21
impeller::OptionsFromPassAndEntity
ContentContextOptions OptionsFromPassAndEntity(const RenderPass &pass, const Entity &entity)
Definition: contents.cc:37
impeller::PrimitiveType::kTriangleStrip
@ kTriangleStrip
impeller::Point
TPoint< Scalar > Point
Definition: point.h:316
render_pass.h
impeller::ColorMatrixFilterContents::ColorMatrixFilterContents
ColorMatrixFilterContents()
impeller::ColorFilterContents::GetAbsorbOpacity
AbsorbOpacity GetAbsorbOpacity() const
Definition: color_filter_contents.cc:89
color_filter_contents.h
anonymous_contents.h
content_context.h
impeller::Contents::RenderProc
std::function< bool(const ContentContext &renderer, const Entity &entity, RenderPass &pass)> RenderProc
Definition: contents.h:49
vector.h
impeller::Contents::CoverageProc
std::function< std::optional< Rect >(const Entity &entity)> CoverageProc
Definition: contents.h:50
impeller::ColorFilterContents::AbsorbOpacity::kYes
@ kYes
impeller::FilterInput::Vector
std::vector< FilterInput::Ref > Vector
Definition: filter_input.h:33
impeller::RenderPipelineT::VertexShader
VertexShader_ VertexShader
Definition: pipeline.h:93
impeller::ColorMatrix
Definition: color.h:117
impeller
Definition: aiks_blur_unittests.cc:20
impeller::Matrix::MakeScale
static constexpr Matrix MakeScale(const Vector3 &s)
Definition: matrix.h:104
impeller::ContentContext
Definition: content_context.h:392
impeller::TRect
Definition: rect.h:122
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37
impeller::AnonymousContents::Make
static std::shared_ptr< Contents > Make(RenderProc render_proc, CoverageProc coverage_proc)
Definition: anonymous_contents.cc:11
vertex_buffer_builder.h