// Copyright (C) 2011 Kornel Kisielewicz
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

#include "nv/gl/image.hh"

#include <cstring>

using namespace nv;

image::image( glm::ivec2 size, size_t depth )
	: m_size( size ), m_depth( depth ), m_data( nullptr )
{
	m_data = new uint8[ m_size.x * m_size.y * m_depth ];
}

image::image( glm::ivec2 size, size_t depth, const uint8 * data, bool reversed )
	: m_size( size ), m_depth( depth ), m_data( nullptr )
{
	m_data = new uint8[ m_size.x * m_size.y * m_depth ];

	if ( reversed )
	{
		for( int i = 0; i < size.y; ++i )
		{
			memcpy( m_data + size.x * ( size.y - i - 1) * m_depth, data + i * size.x * m_depth, m_size.x * m_depth );
		}

	}
	else 
	{
		memcpy( m_data, data, m_size.x * m_size.y * m_depth );
	}
}

void image::fill( uint8 value )
{
	memset( m_data, value, m_size.x * m_size.y * m_depth );
}

void image::set_region( region r, const uint8 * data, size_t stride )
{
	if ( stride == 0 ) stride = r.size.x;

	for( int i = 0; i < r.size.y; ++i )
 	{
		memcpy( m_data+((r.pos.y+i)*m_size.x + r.pos.x ) * m_depth, 
			data + (i*stride), r.size.x * m_depth );
	}
}

image::~image()
{
	delete[] m_data;
}