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/*
SANE EPSON backend
Copyright (C) 2001 SEIKO EPSON CORPORATION
Date Author Reason
07/10/2001 Peter New
This file is part of the `iscan' program.
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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
As a special exception, the copyright holders give permission
to link the code of this program with the esmod library and
distribute linked combinations including the two. You must obey
the GNU General Public License in all respects for all of the
code used other then esmod.
*/
/*--------------------------------------------------------------*/
#include "pisa_img_converter.h"
#include "pisa_error.h"
/*--------------------------------------------------------------*/
/*Convert 8bpp grayscale pixels to 24bpp rgb pixels*/
int convert_grayscale_to_rgb(BYTE* in_buf, long width, long height, BYTE* out_rgb_buf)
{
long i,j,ofs;
ofs = 0;
for( i = 0; i<height; i++)
for( j = 0; j<width; j++, ofs+=3)
{
/*just copy the gray value 3 times to make rgb*/
out_rgb_buf[ofs] = in_buf[i*width+j];
out_rgb_buf[ofs+1] = out_rgb_buf[ofs];
out_rgb_buf[ofs+2] = out_rgb_buf[ofs];
}
return PISA_ERR_SUCCESS;
}
/*Convert 1bpp b&w pixels to 24bpp rgb pixels*/
int convert_binary_to_rgb(BYTE* in_buf, long width, long height, BYTE* out_rgb_buf)
{
long i,j,in_ofs, out_ofs;
int rgb_val;
int bitshift;
unsigned int temp_byte = 0;
//offset into input image
in_ofs = 0;
//offset into output image
out_ofs = 0;
for( i = 0; i<height; i++)
{
j = 0;
bitshift = -1;
in_ofs = i*(int)((width+7)/8);
while( j<width)
{
//get a new byte every 8 columns
if(j%8 == 0)
{
temp_byte = in_buf[in_ofs+(int)(j/8)];
bitshift = 7;
}
//black or white pixel
if((temp_byte >> bitshift) & 1)
rgb_val = IMG_CONVERTER_RGB_WHITE;
else
rgb_val = IMG_CONVERTER_RGB_BLACK;
//write the rgb values
out_rgb_buf[out_ofs] = (unsigned int) rgb_val;
out_rgb_buf[out_ofs+1] = (unsigned int)rgb_val;
out_rgb_buf[out_ofs+2] = (unsigned int)rgb_val;
j++;
out_ofs+=3;
bitshift--;
}
}
return PISA_ERR_SUCCESS;
}
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