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.
 
#pragma once
 
#include <functional>
#include <memory>
#include <vector>
 
#include "flutter/fml/macros.h"
#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(std::unique_ptr<Geometry> geometry);
 
  void SetClipOperation(Entity::ClipOperation clip_op);
 
  // |Contents|
  std::optional<Rect> GetCoverage(const Entity& entity) const override;
 
  // |Contents|
  StencilCoverage GetStencilCoverage(
      const Entity& entity,
      const std::optional<Rect>& current_stencil_coverage) const override;
 
  // |Contents|
  bool ShouldRender(const Entity& entity,
                    const std::optional<Rect>& stencil_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::unique_ptr<Geometry> geometry_;
  Entity::ClipOperation clip_op_ = Entity::ClipOperation::kIntersect;
 
  FML_DISALLOW_COPY_AND_ASSIGN(ClipContents);
};
 
class ClipRestoreContents final : public Contents {
 public:
  ClipRestoreContents();
 
  ~ClipRestoreContents();
 
  /// @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 transformation.
  void SetRestoreCoverage(std::optional<Rect> coverage);
 
  // |Contents|
  std::optional<Rect> GetCoverage(const Entity& entity) const override;
 
  // |Contents|
  StencilCoverage GetStencilCoverage(
      const Entity& entity,
      const std::optional<Rect>& current_stencil_coverage) const override;
 
  // |Contents|
  bool ShouldRender(const Entity& entity,
                    const std::optional<Rect>& stencil_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_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(ClipRestoreContents);
};
 
}  // namespace impeller