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85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*#define DEBUG_ENABLED */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstvideoscale.h"
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/* scalers */
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void gst_videoscale_generate_rowbytes_x86 (unsigned char *copy_row, int src_w,
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int dst_w, int bpp);
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void gst_videoscale_scale_nearest_x86 (GstVideoscale * scale,
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unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh);
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#define PREFIX16 0x66
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#define STORE_BYTE 0xAA
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#define STORE_WORD 0xAB
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#define LOAD_BYTE 0xAC
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#define LOAD_WORD 0xAD
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#define RETURN 0xC3
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void
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gst_videoscale_generate_rowbytes_x86 (unsigned char *copy_row, int src_w,
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int dst_w, int bpp)
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{
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int i;
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int pos, inc;
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unsigned char *eip;
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unsigned char load, store;
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GST_DEBUG ("videoscale: setup scaling %p", copy_row);
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switch (bpp) {
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case 1:
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load = LOAD_BYTE;
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store = STORE_BYTE;
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break;
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case 2:
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case 4:
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load = LOAD_WORD;
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store = STORE_WORD;
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break;
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default:
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return;
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}
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pos = 0x10000;
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inc = (src_w << 16) / dst_w;
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eip = copy_row;
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for (i = 0; i < dst_w; ++i) {
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while (pos >= 0x10000L) {
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if (bpp == 2) {
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*eip++ = PREFIX16;
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}
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*eip++ = load;
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pos -= 0x10000L;
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}
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if (bpp == 2) {
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*eip++ = PREFIX16;
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}
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*eip++ = store;
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pos += inc;
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}
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*eip++ = RETURN;
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GST_DEBUG ("scaler start/end %p %p %p", copy_row, eip,
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(void *) (eip - copy_row));
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}
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