/*
	Copyright (C) 2012  fmaj7b5.info

	This program 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.

	This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef FM7b5_IMAGE_H
#define FM7b5_IMAGE_H

#include <memory>
#include <cstdint>

//#include "MDView.h"

namespace FM7b5
{
	template <class T>
	class Image
	{
	public:
		typedef T pixel_type;
		typedef Image<T> image_type;
		typedef std::uint_fast8_t raw_type;

		Image();
		Image(const size_t width, const size_t height, const size_t stride = 0);
		~Image();

		T& operator()(const size_t x, const size_t y);
		const T& operator()(const size_t x, const size_t y) const;

		size_t width() const;
		size_t height() const;
		size_t bpp() const;
		size_t stride() const;
		size_t size() const;

		T* data();
		const T* data() const;

	protected:
		size_t m_width;
		size_t m_height;
		size_t m_byte_per_pixel;
		size_t m_stride;
		size_t m_size;
		std::shared_ptr<raw_type> m_data;

		size_t align_up(const size_t size, const size_t alignment);
	};


	template <class T>
	Image<T>::Image()
		: m_width(0), m_height(0),
		  m_byte_per_pixel(sizeof(T)),
		  m_stride(0), m_size(0), m_data(0)
	{}

	template <class T>
	Image<T>::Image(const size_t width, const size_t height, const size_t stride)
		: m_width(width), m_height(height),
		  m_byte_per_pixel(sizeof(T)),
		  m_stride(stride == 0 ? sizeof(T) * width : stride),
		  m_size(m_stride * height)
	{
		m_data.reset(new raw_type[m_size]);
	}

	template <class T>
	Image<T>::~Image()
	{}

	template <class T>
	T&
	Image<T>::operator()(const size_t x, const size_t y)
	{
		return *(reinterpret_cast<T*>(m_data.get() + m_stride * y + m_byte_per_pixel * x));
	}

	template <class T>
	const T&
	Image<T>::operator()(const size_t x, const size_t y) const
	{
		return *(reinterpret_cast<T*>(m_data.get() + m_stride * y + m_byte_per_pixel * x));
	}

	template <class T>
	size_t
	Image<T>::width() const
	{
		return m_width;
	}

	template <class T>
	size_t
	Image<T>::height() const
	{
		return m_height;
	}

	template <class T>
	size_t
	Image<T>::bpp() const
	{
		return m_byte_per_pixel;
	}

	template <class T>
	size_t
	Image<T>::stride() const
	{
		return m_stride;
	}

	template <class T>
	size_t
	Image<T>::size() const
	{
		return m_size;
	}

	template <class T>
	T*
	Image<T>::data()
	{
		return reinterpret_cast<T*>(m_data.get());
	}

	template <class T>
	const T*
	Image<T>::data() const
	{
		return reinterpret_cast<const T*>(m_data.get());
	}

	template <class T>
	size_t
	Image<T>::align_up(const size_t size, const size_t alignment)
	{
		return size + (alignment - (size % alignment));
	}

	/* typedefs for convinience */
	typedef Image<std::uint_fast8_t> ImageGray;
}

#endif /* FM7b5_IMAGE_H */