//:Source:206, "llgfx_texture_jpg", 3b93fb50
//
// File: llgfx_read_jpg.cpp
//
// ############################################################################
// #             G A M E.O.N.E - LOW LEVEL LIB V1.0                           #
// ############################################################################
// Copyright (C) 2001 LEVEL ONE ENTERTAINMENT, 
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or any later version.
// 
// This library 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
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// 
// Libhome   <http://lowlevellib.sourceforge.net>
// Contact   <mailto:alex.piko@l-e-v-e-l-o-n-e.com>
//
// Modification History:
// 03 Sep 2001, Alex Piko -- Generated 23:51:12 by Genitor OCS V4.50.915.2
//
//:-----------------------------------------------------------------------------

//:Custom
#include "llgfx_read_jpg.h"


//:>                   +-----------------------------------+
//:>-------------------|    Global Function Definitions    |--------------------
//:>                   +-----------------------------------+

//::1
// +-------------------+
// |  txReadJPGData()  |
// +-------------------+

int txReadJPGData(
	llfile_sMAPFILE *stream,
	s_texture *info)
{
	SYS_ASSERT_PTR(info);
	
	if (Pd->begin())
		return FAIL;

	uchar *Pbuf = (uchar*) info->data;

	for ( ; ; )
	{
		void *Pscan_line_ofs;
		uint scan_line_len;
		
		if (Pd->decode(&Pscan_line_ofs, &scan_line_len))
			break;
		
		if (Pd->get_num_components() == 3)
		{
			uchar *Psb = (uchar *)Pscan_line_ofs;
			uchar *Pdb = (uchar *)Pbuf;
			
			int src_bpp = Pd->get_bytes_per_pixel();
			
			for (int x = Pd->get_width(); x > 0; x--, Psb += src_bpp, Pdb += 3)
			{
				Pdb[0] = Psb[2];
				Pdb[1] = Psb[1];
				Pdb[2] = Psb[0];
			}
			
			Pbuf = Pdb;
		}
		else
		{
			//status = Pdst->write_line(Pscan_line_ofs);
			memcpy(Pbuf,Pscan_line_ofs,Pd->get_width());
			Pbuf += Pd->get_width();
		}
	}
	
	delete Pd;
	delete Pinput_stream;
	Pinput_stream = NULL;
	Pd = NULL;

	return OK;
}

//::2
// +---------------------+
// |  txReadJPGHeader()  |
// +---------------------+

int txReadJPGHeader(
	llfile_sMAPFILE *stream,
	s_texture *info)
{
	SYS_ASSERT_PTR(info);
	

	llfile_fseek(stream,0,SEEK_SET);

	Pinput_stream = (Pjpeg_decoder_file_stream)
			new l3lib_jpeg_decoder_file_stream(stream);

	Pd = new jpeg_decoder(Pinput_stream, false);

	if (Pd->get_error_code() != 0)
	{
		delete Pd;
		delete Pinput_stream;
		Pinput_stream = NULL;
		Pd = NULL;
		return FAIL;
	}


	info->width  = Pd->get_width();
	info->height = Pd->get_height();

	if( Pd->get_num_components() == 1 )
		info->format = TXFMT_I_8;
	else
		info->format = TXFMT_RGB;

	return OK;
}