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- // VirtualDub - Video processing and capture application
- // Copyright (C) 1998-2001 Avery Lee
- //
- // 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.
-
- #include "filter.h"
-
- extern "C" void asm_reduceby2_32(
- void *dst,
- void *src,
- unsigned long width,
- unsigned long height,
- unsigned long srcstride,
- unsigned long dststride);
-
- static int reduce_run(const FilterActivation *fa, const FilterFunctions *ff) {
- asm_reduceby2_32(fa->dst.data, fa->src.data, fa->dst.w, fa->dst.h, fa->src.pitch, fa->dst.pitch);
-
- return 0;
- }
-
- static long reduce_param(FilterActivation *fa, const FilterFunctions *ff) {
- fa->dst.w /= 2;
- fa->dst.h /= 2;
- fa->dst.pitch = fa->dst.w*4;
-
- return FILTERPARAM_SWAP_BUFFERS;
- }
-
- FilterDefinition filterDef_reduceby2={
- 0,0,NULL,
- "2:1 reduction",
- "Reduces the size of an image by 2:1 in both directions. A 2x2 non-overlapping matrix is used.\n\n[Assembly optimized] [MMX optimized]",
- NULL,NULL,
- 0,
- NULL,NULL,
- reduce_run,
- reduce_param,
- };