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/*
This file is part of Warzone 2100.
Copyright (C) 2021 Warzone 2100 Project
Warzone 2100 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Warzone 2100 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __INCLUDED_LIB_WIDGET_GRIDALLOCATION_H__
#define __INCLUDED_LIB_WIDGET_GRIDALLOCATION_H__
#include <map>
#include <set>
#include <vector>
namespace grid_allocation
{
struct slot
{
slot(uint32_t start = 0, uint32_t span = 1, bool expandable = true);
uint32_t start;
uint32_t span;
bool expandable;
};
struct item
{
grid_allocation::slot slot;
int32_t ideal_size;
uint32_t start() const;
uint32_t end() const;
uint32_t span() const;
bool expandable() const;
};
class allocator
{
public:
allocator(const std::vector<item> &items);
std::map<uint32_t, int32_t> calculate_offsets(int32_t available_space);
int get_minimum_size();
private:
void initialize_steps(const std::vector<grid_allocation::item> &items);
std::vector<item> normalize_items(const std::vector<grid_allocation::item> &items);
void initialize_expandable_map(const std::vector<item>& items);
void initialize_base_sizes(const std::vector<item>& items);
void expand(std::vector<int32_t>& sizes, int32_t space, size_t start, size_t end);
void shrink(std::vector<int32_t>& sizes, int32_t space, size_t start, size_t end);
size_t slots_size;
std::map<uint32_t, uint32_t> steps_index;
std::vector<uint32_t> steps;
std::vector<int32_t> base_sizes;
std::vector<bool> expandable_map;
};
}
#endif // __INCLUDED_LIB_WIDGET_GRIDALLOCATION_H__
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