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.
 
#ifndef FLUTTER_IMPELLER_AIKS_PAINT_PASS_DELEGATE_H_
#define FLUTTER_IMPELLER_AIKS_PAINT_PASS_DELEGATE_H_
 
#include <optional>
 
#include "flutter/fml/macros.h"
#include "impeller/aiks/paint.h"
#include "impeller/entity/entity_pass_delegate.h"
 
namespace impeller {
 
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_;
 
  PaintPassDelegate(const PaintPassDelegate&) = delete;
 
  PaintPassDelegate& operator=(const PaintPassDelegate&) = delete;
};
 
/// 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_;
 
  OpacityPeepholePassDelegate(const OpacityPeepholePassDelegate&) = delete;
 
  OpacityPeepholePassDelegate& operator=(const OpacityPeepholePassDelegate&) =
      delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_AIKS_PAINT_PASS_DELEGATE_H_