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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/border_mask_blur_filter_contents.h" |
| 6 | +#include "impeller/entity/contents/content_context.h" |
| 7 | + |
| 8 | +#include "impeller/entity/contents/contents.h" |
| 9 | +#include "impeller/renderer/render_pass.h" |
| 10 | +#include "impeller/renderer/sampler_library.h" |
| 11 | + |
| 12 | +namespace impeller { |
| 13 | + |
| 14 | +BorderMaskBlurFilterContents::BorderMaskBlurFilterContents() = default; |
| 15 | + |
| 16 | +BorderMaskBlurFilterContents::~BorderMaskBlurFilterContents() = default; |
| 17 | + |
| 18 | +void BorderMaskBlurFilterContents::SetSigma(Sigma sigma_x, Sigma sigma_y) { |
| 19 | + sigma_x_ = sigma_x; |
| 20 | + sigma_y_ = sigma_y; |
| 21 | +} |
| 22 | + |
| 23 | +void BorderMaskBlurFilterContents::SetBlurStyle(BlurStyle blur_style) { |
| 24 | + blur_style_ = blur_style; |
| 25 | + |
| 26 | + switch (blur_style) { |
| 27 | + case FilterContents::BlurStyle::kNormal: |
| 28 | + src_color_factor_ = false; |
| 29 | + inner_blur_factor_ = true; |
| 30 | + outer_blur_factor_ = true; |
| 31 | + break; |
| 32 | + case FilterContents::BlurStyle::kSolid: |
| 33 | + src_color_factor_ = true; |
| 34 | + inner_blur_factor_ = false; |
| 35 | + outer_blur_factor_ = true; |
| 36 | + break; |
| 37 | + case FilterContents::BlurStyle::kOuter: |
| 38 | + src_color_factor_ = false; |
| 39 | + inner_blur_factor_ = false; |
| 40 | + outer_blur_factor_ = true; |
| 41 | + break; |
| 42 | + case FilterContents::BlurStyle::kInner: |
| 43 | + src_color_factor_ = false; |
| 44 | + inner_blur_factor_ = true; |
| 45 | + outer_blur_factor_ = false; |
| 46 | + break; |
| 47 | + } |
| 48 | +} |
| 49 | + |
| 50 | +bool BorderMaskBlurFilterContents::RenderFilter( |
| 51 | + const FilterInput::Vector& inputs, |
| 52 | + const ContentContext& renderer, |
| 53 | + const Entity& entity, |
| 54 | + RenderPass& pass, |
| 55 | + const Rect& coverage) const { |
| 56 | + if (inputs.empty()) { |
| 57 | + return true; |
| 58 | + } |
| 59 | + |
| 60 | + using VS = BorderMaskBlurPipeline::VertexShader; |
| 61 | + using FS = BorderMaskBlurPipeline::FragmentShader; |
| 62 | + |
| 63 | + auto& host_buffer = pass.GetTransientsBuffer(); |
| 64 | + |
| 65 | + auto input_snapshot = inputs[0]->GetSnapshot(renderer, entity); |
| 66 | + if (!input_snapshot.has_value()) { |
| 67 | + return true; |
| 68 | + } |
| 69 | + auto maybe_input_uvs = input_snapshot->GetCoverageUVs(coverage); |
| 70 | + if (!maybe_input_uvs.has_value()) { |
| 71 | + return true; |
| 72 | + } |
| 73 | + auto input_uvs = maybe_input_uvs.value(); |
| 74 | + |
| 75 | + VertexBufferBuilder<VS::PerVertexData> vtx_builder; |
| 76 | + vtx_builder.AddVertices({ |
| 77 | + {Point(0, 0), input_uvs[0]}, |
| 78 | + {Point(1, 0), input_uvs[1]}, |
| 79 | + {Point(1, 1), input_uvs[3]}, |
| 80 | + {Point(0, 0), input_uvs[0]}, |
| 81 | + {Point(1, 1), input_uvs[3]}, |
| 82 | + {Point(0, 1), input_uvs[2]}, |
| 83 | + }); |
| 84 | + auto vtx_buffer = vtx_builder.CreateVertexBuffer(host_buffer); |
| 85 | + |
| 86 | + Command cmd; |
| 87 | + cmd.label = "Border Mask Blur Filter"; |
| 88 | + auto options = OptionsFromPass(pass); |
| 89 | + options.blend_mode = Entity::BlendMode::kSource; |
| 90 | + cmd.pipeline = renderer.GetBorderMaskBlurPipeline(options); |
| 91 | + cmd.BindVertices(vtx_buffer); |
| 92 | + |
| 93 | + VS::FrameInfo frame_info; |
| 94 | + frame_info.mvp = Matrix::MakeOrthographic(ISize(1, 1)); |
| 95 | + auto scale = entity.GetTransformation().GetScale(); |
| 96 | + frame_info.sigma_uv = Vector2(scale.x, scale.y) * |
| 97 | + Vector2(sigma_x_.sigma, sigma_y_.sigma).Abs() / |
| 98 | + input_snapshot->texture->GetSize(); |
| 99 | + frame_info.src_factor = src_color_factor_; |
| 100 | + frame_info.inner_blur_factor = inner_blur_factor_; |
| 101 | + frame_info.outer_blur_factor = outer_blur_factor_; |
| 102 | + auto uniform_view = host_buffer.EmplaceUniform(frame_info); |
| 103 | + VS::BindFrameInfo(cmd, uniform_view); |
| 104 | + |
| 105 | + auto sampler = renderer.GetContext()->GetSamplerLibrary()->GetSampler({}); |
| 106 | + FS::BindTextureSampler(cmd, input_snapshot->texture, sampler); |
| 107 | + |
| 108 | + return pass.AddCommand(std::move(cmd)); |
| 109 | +} |
| 110 | + |
| 111 | +std::optional<Rect> BorderMaskBlurFilterContents::GetCoverage( |
| 112 | + const Entity& entity) const { |
| 113 | + auto coverage = FilterContents::GetCoverage(entity); |
| 114 | + if (!coverage.has_value()) { |
| 115 | + return std::nullopt; |
| 116 | + } |
| 117 | + |
| 118 | + // Technically this works with all of our current filters, but this should be |
| 119 | + // using the input[0] transform, not the entity transform! |
| 120 | + // See: https://github.com/flutter/impeller/pull/130#issuecomment-1098892423 |
| 121 | + auto transformed_blur_vector = |
| 122 | + entity.GetTransformation() |
| 123 | + .TransformDirection( |
| 124 | + Vector2(Radius{sigma_x_}.radius, Radius{sigma_y_}.radius)) |
| 125 | + .Abs(); |
| 126 | + auto extent = coverage->size + transformed_blur_vector * 2; |
| 127 | + return Rect(coverage->origin - transformed_blur_vector, |
| 128 | + Size(extent.x, extent.y)); |
| 129 | +} |
| 130 | + |
| 131 | +} // namespace impeller |
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