gaussian_blur_filter_contents.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#pragma once
 
#include <memory>
#include <optional>
#include "impeller/entity/contents/filters/filter_contents.h"
#include "impeller/entity/contents/filters/inputs/filter_input.h"
 
namespace impeller {
 
class DirectionalGaussianBlurFilterContents final : public FilterContents {
 public:
  DirectionalGaussianBlurFilterContents();
 
  ~DirectionalGaussianBlurFilterContents() override;
 
  void SetSigma(Sigma sigma);
 
  void SetSecondarySigma(Sigma sigma);
 
  void SetDirection(Vector2 direction);
 
  void SetBlurStyle(BlurStyle blur_style);
 
  void SetTileMode(Entity::TileMode tile_mode);
 
  void SetIsSecondPass(bool is_second_pass);
 
  // |FilterContents|
  std::optional<Rect> GetFilterCoverage(
      const FilterInput::Vector& inputs,
      const Entity& entity,
      const Matrix& effect_transform) const override;
 
 private:
  // |FilterContents|
  std::optional<Entity> RenderFilter(
      const FilterInput::Vector& input_textures,
      const ContentContext& renderer,
      const Entity& entity,
      const Matrix& effect_transform,
      const Rect& coverage,
      const std::optional<Rect>& coverage_hint) const override;
  Sigma blur_sigma_;
  Sigma secondary_blur_sigma_;
  Vector2 blur_direction_;
  BlurStyle blur_style_ = BlurStyle::kNormal;
  Entity::TileMode tile_mode_ = Entity::TileMode::kDecal;
  bool is_second_pass_ = false;
 
  FML_DISALLOW_COPY_AND_ASSIGN(DirectionalGaussianBlurFilterContents);
};
 
}  // namespace impeller