// Aseprite Document Library
// Copyright (c) 2023  Igara Studio S.A.
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.

#ifndef DOC_RENDER_PLAN_H_INCLUDED
#define DOC_RENDER_PLAN_H_INCLUDED
#pragma once

#include "doc/cel.h"
#include "doc/cel_list.h"
#include "doc/frame.h"

namespace doc {
class Layer;

// Creates a list of cels to be rendered in the correct order
// (depending on layer ordering + z-index) to render the given root
// layer/layers.
class RenderPlan {
public:
  struct Item {
    int order;
    const Layer* layer;
    const Cel* cel;
    int zIndex() const { return (cel ? cel->zIndex() : 0); }
    Item(const int order = 0, const Layer* layer = nullptr, const Cel* cel = nullptr)
      : order(order)
      , layer(layer)
      , cel(cel)
    {
    }
  };
  using Items = std::vector<Item>;

  RenderPlan();

  const Items& items() const
  {
    if (m_processZIndex)
      processZIndexes();
    return m_items;
  }

  void addLayer(const Layer* layer, const frame_t frame);

private:
  void processZIndexes() const;

  int m_order = 0;
  mutable Items m_items;
  mutable bool m_processZIndex = true;
};

} // namespace doc

#endif
