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Amiga Plus Special 26
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AMIGAplus Sonderheft 26 (2000)(Falke)(DE)(Track 1 of 2)[!].iso
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Animviewer
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mpegvideo_datatype
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mpeggray.c
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C/C++ Source or Header
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1999-03-29
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2KB
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66 lines
/*
**
** $VER: mpeggray.c 1.4 (9.11.96)
** mpegvideo.datatype 1.0
**
** grayscale dithering
**
** Written 1996 by Roland 'Gizzy' Mainz
**
*/
/* project includes */
#include "mpegmyassert.h"
#include "mpegvideo.h"
#include "mpegproto.h"
/*
*--------------------------------------------------------------
*
* GrayDitherImage --
*
* Dithers image into 128 gray scales. Simply maps luminance
* value into 1 of 128 gray scale colors (divide by two, essentially).
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void GrayDitherImage( struct MPEGVideoInstData *mvid, UBYTE *lum, UBYTE *cr, UBYTE *cb, UBYTE *out, UWORD h, UWORD w )
{
ULONG i,
max = (w * h) / 16;
for( i = 0UL ; i < max ; i++ )
{
out[ 0 ] = mappixel[ lum[ 0 ] ];
out[ 1 ] = mappixel[ lum[ 1 ] ];
out[ 2 ] = mappixel[ lum[ 2 ] ];
out[ 3 ] = mappixel[ lum[ 3 ] ];
out[ 4 ] = mappixel[ lum[ 4 ] ];
out[ 5 ] = mappixel[ lum[ 5 ] ];
out[ 6 ] = mappixel[ lum[ 6 ] ];
out[ 7 ] = mappixel[ lum[ 7 ] ];
out[ 8 ] = mappixel[ lum[ 8 ] ];
out[ 9 ] = mappixel[ lum[ 9 ] ];
out[ 10 ] = mappixel[ lum[ 10 ] ];
out[ 11 ] = mappixel[ lum[ 11 ] ];
out[ 12 ] = mappixel[ lum[ 12 ] ];
out[ 13 ] = mappixel[ lum[ 13 ] ];
out[ 14 ] = mappixel[ lum[ 14 ] ];
out[ 15 ] = mappixel[ lum[ 15 ] ];
out += 16;
lum += 16;
}
}