entity_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_ENTITY_ENTITY_PASS_DELEGATE_H_
#define FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_DELEGATE_H_
 
#include <memory>
 
#include "flutter/fml/macros.h"
#include "impeller/core/texture.h"
#include "impeller/entity/contents/contents.h"
#include "impeller/entity/contents/filters/filter_contents.h"
#include "impeller/entity/contents/filters/inputs/filter_input.h"
 
namespace impeller {
 
class EntityPass;
 
class EntityPassDelegate {
 public:
  static std::unique_ptr<EntityPassDelegate> MakeDefault();
 
  EntityPassDelegate();
 
  virtual ~EntityPassDelegate();
 
  virtual bool CanElide() = 0;
 
  /// @brief  Whether or not this entity pass can be collapsed into the parent.
  ///         If true, this method may modify the entities for the current pass.
  virtual bool CanCollapseIntoParentPass(EntityPass* entity_pass) = 0;
 
  virtual std::shared_ptr<Contents> CreateContentsForSubpassTarget(
      std::shared_ptr<Texture> target,
      const Matrix& effect_transform) = 0;
 
  virtual std::shared_ptr<FilterContents> WithImageFilter(
      const FilterInput::Variant& input,
      const Matrix& effect_transform) const = 0;
 
 private:
  EntityPassDelegate(const EntityPassDelegate&) = delete;
 
  EntityPassDelegate& operator=(const EntityPassDelegate&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_DELEGATE_H_