paint_pass_delegate.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 <optional>
 
#include "flutter/fml/macros.h"
#include "impeller/aiks/paint.h"
#include "impeller/entity/entity_pass_delegate.h"
 
namespace impeller {
 
class EntityPass;
 
class PaintPassDelegate final : public EntityPassDelegate {
 public:
  explicit PaintPassDelegate(Paint paint);
 
  // |EntityPassDelgate|
  ~PaintPassDelegate() override;
 
  // |EntityPassDelgate|
  bool CanElide() override;
 
  // |EntityPassDelgate|
  bool CanCollapseIntoParentPass(EntityPass* entity_pass) override;
 
  // |EntityPassDelgate|
  std::shared_ptr<Contents> CreateContentsForSubpassTarget(
      std::shared_ptr<Texture> target,
      const Matrix& effect_transform) override;
 
  // |EntityPassDelgate|
  std::shared_ptr<FilterContents> WithImageFilter(
      const FilterInput::Variant& input,
      const Matrix& effect_transform) const override;
 
 private:
  const Paint paint_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(PaintPassDelegate);
};
 
/// A delegate that attempts to forward opacity from a save layer to
/// child contents.
///
/// Currently this has a hardcoded limit of 3 entities in a pass, and
/// cannot forward to child subpass delegates.
class OpacityPeepholePassDelegate final : public EntityPassDelegate {
 public:
  explicit OpacityPeepholePassDelegate(Paint paint);
 
  // |EntityPassDelgate|
  ~OpacityPeepholePassDelegate() override;
 
  // |EntityPassDelgate|
  bool CanElide() override;
 
  // |EntityPassDelgate|
  bool CanCollapseIntoParentPass(EntityPass* entity_pass) override;
 
  // |EntityPassDelgate|
  std::shared_ptr<Contents> CreateContentsForSubpassTarget(
      std::shared_ptr<Texture> target,
      const Matrix& effect_transform) override;
 
  // |EntityPassDelgate|
  std::shared_ptr<FilterContents> WithImageFilter(
      const FilterInput::Variant& input,
      const Matrix& effect_transform) const override;
 
 private:
  const Paint paint_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(OpacityPeepholePassDelegate);
};
 
}  // namespace impeller