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frames_iterators.h
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// Aseprite Document Library
// Copyright (c) 2024 Igara Studio S.A.
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.
#ifndef DOC_FRAMES_ITERATORS_H_INCLUDED
#define DOC_FRAMES_ITERATORS_H_INCLUDED
#pragma once
#include "doc/frame_range.h"
#include <iosfwd>
#include <vector>
namespace doc { namespace frames {
typedef std::vector<FrameRange> Ranges;
class const_iterator {
static const int kNullFrame = -2;
public:
using iterator_category = std::forward_iterator_tag;
using value_type = frame_t;
using difference_type = std::ptrdiff_t;
using pointer = frame_t*;
using reference = frame_t&;
const_iterator(const frames::Ranges::const_iterator& it) : m_it(it), m_frame(kNullFrame) {}
const_iterator& operator++()
{
if (m_frame == kNullFrame)
m_frame = m_it->fromFrame;
if (m_it->fromFrame <= m_it->toFrame) {
if (m_frame < m_it->toFrame)
++m_frame;
else {
m_frame = kNullFrame;
++m_it;
}
}
else {
if (m_frame > m_it->toFrame)
--m_frame;
else {
m_frame = kNullFrame;
++m_it;
}
}
return *this;
}
frame_t operator*() const
{
if (m_frame == kNullFrame)
m_frame = m_it->fromFrame;
return m_frame;
}
bool operator==(const const_iterator& o) const
{
return (m_it == o.m_it && m_frame == o.m_frame);
}
bool operator!=(const const_iterator& it) const { return !operator==(it); }
private:
mutable frames::Ranges::const_iterator m_it;
mutable frame_t m_frame;
};
class const_reverse_iterator {
public:
using iterator_category = std::forward_iterator_tag;
using value_type = frame_t;
using difference_type = std::ptrdiff_t;
using pointer = frame_t*;
using reference = frame_t&;
const_reverse_iterator(const frames::Ranges::const_reverse_iterator& it) : m_it(it), m_frame(-1)
{
}
const_reverse_iterator& operator++()
{
if (m_frame < 0)
m_frame = m_it->toFrame;
int step = (m_it->fromFrame > m_it->toFrame) - (m_it->fromFrame < m_it->toFrame);
if ((step < 0 && m_frame > m_it->fromFrame) || (step > 0 && m_frame < m_it->fromFrame))
m_frame += step;
else {
m_frame = -1;
++m_it;
}
return *this;
}
frame_t operator*() const
{
if (m_frame < 0)
m_frame = m_it->toFrame;
return m_frame;
}
bool operator==(const const_reverse_iterator& o) const
{
return (m_it == o.m_it && m_frame == o.m_frame);
}
bool operator!=(const const_reverse_iterator& it) const { return !operator==(it); }
private:
mutable frames::Ranges::const_reverse_iterator m_it;
mutable frame_t m_frame;
};
template<typename T>
class Reversed {
public:
typedef const_reverse_iterator const_iterator;
const_iterator begin() const { return m_frames.rbegin(); }
const_iterator end() const { return m_frames.rend(); }
Reversed(const T& frames) : m_frames(frames) {}
private:
const T& m_frames;
};
}} // namespace doc::frames
#endif // DOC_FRAMES_ITERATORS_H_INCLUDED