clip_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.
 
#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_CLIP_CONTENTS_H_
#define FLUTTER_IMPELLER_ENTITY_CONTENTS_CLIP_CONTENTS_H_
 
#include <functional>
#include <memory>
#include <vector>
 
#include "impeller/entity/contents/contents.h"
#include "impeller/entity/entity.h"
#include "impeller/entity/geometry/geometry.h"
 
namespace impeller {
 
class ClipContents final : public Contents {
 public:
  ClipContents();
 
  ~ClipContents();
 
  void SetGeometry(const std::shared_ptr<Geometry>& geometry);
 
  void SetClipOperation(Entity::ClipOperation clip_op);
 
  // |Contents|
  std::optional<Rect> GetCoverage(const Entity& entity) const override;
 
  // |Contents|
  ClipCoverage GetClipCoverage(
      const Entity& entity,
      const std::optional<Rect>& current_clip_coverage) const override;
 
  // |Contents|
  bool ShouldRender(const Entity& entity,
                    const std::optional<Rect> clip_coverage) const override;
 
  // |Contents|
  bool Render(const ContentContext& renderer,
              const Entity& entity,
              RenderPass& pass) const override;
  // |Contents|
  bool CanInheritOpacity(const Entity& entity) const override;
 
  // |Contents|
  void SetInheritedOpacity(Scalar opacity) override;
 
 private:
  std::shared_ptr<Geometry> geometry_;
  Entity::ClipOperation clip_op_ = Entity::ClipOperation::kIntersect;
 
  ClipContents(const ClipContents&) = delete;
 
  ClipContents& operator=(const ClipContents&) = delete;
};
 
class ClipRestoreContents final : public Contents {
 public:
  ClipRestoreContents();
 
  ~ClipRestoreContents();
 
  void SetRestoreHeight(size_t clip_height);
 
  size_t GetRestoreHeight() const;
 
  /// @brief  The area on the pass texture where this clip restore will be
  ///         applied. If unset, the entire pass texture will be restored.
  ///
  /// @note   This rectangle is not transformed by the entity's transform.
  void SetRestoreCoverage(std::optional<Rect> coverage);
 
  // |Contents|
  std::optional<Rect> GetCoverage(const Entity& entity) const override;
 
  // |Contents|
  ClipCoverage GetClipCoverage(
      const Entity& entity,
      const std::optional<Rect>& current_clip_coverage) const override;
 
  // |Contents|
  bool ShouldRender(const Entity& entity,
                    const std::optional<Rect> clip_coverage) const override;
 
  // |Contents|
  bool Render(const ContentContext& renderer,
              const Entity& entity,
              RenderPass& pass) const override;
 
  // |Contents|
  bool CanInheritOpacity(const Entity& entity) const override;
 
  // |Contents|
  void SetInheritedOpacity(Scalar opacity) override;
 
 private:
  std::optional<Rect> restore_coverage_;
  size_t restore_height_ = 0;
 
  ClipRestoreContents(const ClipRestoreContents&) = delete;
 
  ClipRestoreContents& operator=(const ClipRestoreContents&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_CLIP_CONTENTS_H_