gstreamer/gst/videoscale/videoscale_x86.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
/*#define DEBUG_ENABLED */
#include "gstvideoscale.h"
/* scalers */
void gst_videoscale_generate_rowbytes_x86 (unsigned char *copy_row, int src_w, int dst_w, int bpp);
void gst_videoscale_scale_nearest_x86 (GstVideoscale *scale,
unsigned char *src, unsigned char *dest,
int sw, int sh, int dw, int dh);
#define PREFIX16 0x66
#define STORE_BYTE 0xAA
#define STORE_WORD 0xAB
#define LOAD_BYTE 0xAC
#define LOAD_WORD 0xAD
#define RETURN 0xC3
void
gst_videoscale_generate_rowbytes_x86 (unsigned char *copy_row, int src_w, int dst_w, int bpp)
{
int i;
int pos, inc;
unsigned char *eip;
unsigned char load, store;
GST_DEBUG ("videoscale: setup scaling %p", copy_row);
switch (bpp) {
case 1:
load = LOAD_BYTE;
store = STORE_BYTE;
break;
case 2:
case 4:
load = LOAD_WORD;
store = STORE_WORD;
break;
default:
return;
}
pos = 0x10000;
inc = (src_w << 16) / dst_w;
eip = copy_row;
for ( i=0; i<dst_w; ++i ) {
while ( pos >= 0x10000L ) {
if ( bpp == 2 ) {
*eip++ = PREFIX16;
}
*eip++ = load;
pos -= 0x10000L;
}
if ( bpp == 2 ) {
*eip++ = PREFIX16;
}
*eip++ = store;
pos += inc;
}
*eip++ = RETURN;
GST_DEBUG ("scaler start/end %p %p %p", copy_row, eip, (void*)(eip-copy_row));
}