atlas_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_ATLAS_CONTENTS_H_
#define FLUTTER_IMPELLER_ENTITY_CONTENTS_ATLAS_CONTENTS_H_
 
#include <memory>
 
#include "impeller/core/sampler_descriptor.h"
#include "impeller/entity/contents/contents.h"
#include "impeller/entity/entity.h"
#include "impeller/geometry/color.h"
 
namespace impeller {
 
// Interface wrapper to allow usage of DL pointer data without copying (or
// circular imports).
class AtlasGeometry {
 public:
  virtual bool ShouldUseBlend() const = 0;
 
  virtual bool ShouldSkip() const = 0;
 
  virtual VertexBuffer CreateSimpleVertexBuffer(
      HostBuffer& host_buffer) const = 0;
 
  virtual VertexBuffer CreateBlendVertexBuffer(
      HostBuffer& host_buffer) const = 0;
 
  virtual Rect ComputeBoundingBox() const = 0;
 
  virtual std::shared_ptr<Texture> GetAtlas() const = 0;
 
  virtual const SamplerDescriptor& GetSamplerDescriptor() const = 0;
 
  virtual BlendMode GetBlendMode() const = 0;
};
 
class AtlasContents final : public Contents {
 public:
  explicit AtlasContents();
 
  ~AtlasContents() override;
 
  void SetGeometry(AtlasGeometry* geometry);
 
  void SetAlpha(Scalar alpha);
 
  // |Contents|
  std::optional<Rect> GetCoverage(const Entity& entity) const override;
 
  // |Contents|
  bool Render(const ContentContext& renderer,
              const Entity& entity,
              RenderPass& pass) const override;
 
 private:
  AtlasGeometry* geometry_ = nullptr;
  Scalar alpha_ = 1.0;
 
  AtlasContents(const AtlasContents&) = delete;
 
  AtlasContents& operator=(const AtlasContents&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_ATLAS_CONTENTS_H_