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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"
-
- #define READSRC(byteoff, lineoff) (*(unsigned long *)((char *)src + pitch*(lineoff) + (byteoff*4)))
-
- extern "C" void asm_reduce2hq_run(
- void *dst,
- void *src,
- unsigned long width,
- unsigned long height,
- unsigned long srcstride,
- unsigned long dststride);
-
- static int reduce2hq_run(const FilterActivation *fa, const FilterFunctions *ff) {
- unsigned long w,h;
- unsigned long *src = (unsigned long *)fa->src.data, *dst = (unsigned long *)fa->dst.data;
- unsigned long pitch = fa->src.pitch;
- unsigned long rb, g;
-
- if (!(fa->src.h & 1)) {
- src -= pitch>>2;
-
- if (!(fa->src.w & 1)) {
- rb = ((READSRC( 0,1)&0xff00ff) + (READSRC( 0,2)&0xff00ff)
- +(READSRC( 1,1)&0xff00ff) + (READSRC( 1,2)&0xff00ff));
- g = ((READSRC( 0,1)&0x00ff00) + (READSRC( 0,2)&0x00ff00)
- +(READSRC( 1,1)&0x00ff00) + (READSRC( 1,2)&0x00ff00));
- *dst ++ = ((rb/9) & 0x00ff0000) | ((rb & 0x0000ffff)/9) | ((g/9) & 0x00ff00);
- ++src;
- }
- ++src;
-
- w = (fa->src.w-1)/2;
- do {
- rb = ((READSRC(-1,1)&0xff00ff) + (READSRC(-1,2)&0xff00ff)
- +(READSRC( 0,1)&0xff00ff) + (READSRC( 0,2)&0xff00ff)
- +(READSRC( 1,1)&0xff00ff) + (READSRC( 1,2)&0xff00ff));
- g = ((READSRC(-1,1)&0x00ff00) + (READSRC(-1,2)&0x00ff00)
- +(READSRC( 0,1)&0x00ff00) + (READSRC( 0,2)&0x00ff00)
- +(READSRC( 1,1)&0x00ff00) + (READSRC( 1,2)&0x00ff00));
- *dst ++ = ((rb/9) & 0x00ff0000) | ((rb & 0x0000ffff)/9) | ((g/9) & 0x00ff00);
- src += 2;
- } while(--w);
-
- src += (fa->src.modulo + fa->src.pitch)>>2;
- dst += fa->dst.modulo>>2;
- }
-
- asm_reduce2hq_run(
- fa->src.w&1 ? dst : dst+1,
- fa->src.w&1 ? src+1 : src+2,
- (fa->src.w-1)/2,
- (fa->src.h-1)/2,
- fa->src.pitch,
- fa->dst.pitch);
-
- if (!(fa->src.w & 1)) {
- h = (fa->src.h-1)/2;
- do {
- rb = (((READSRC( 0,0)&0xff00ff) + (READSRC( 0,1)&0xff00ff) + (READSRC( 0,2)&0xff00ff))*2
- +(READSRC( 1,0)&0xff00ff) + (READSRC( 1,1)&0xff00ff) + (READSRC( 1,2)&0xff00ff));
- g = (((READSRC( 0,0)&0x00ff00) + (READSRC( 0,1)&0x00ff00) + (READSRC( 0,2)&0x00ff00))*2
- +(READSRC( 1,0)&0x00ff00) + (READSRC( 1,1)&0x00ff00) + (READSRC( 1,2)&0x00ff00));
- *dst = ((rb/9) & 0x00ff0000) | ((rb & 0x0000ffff)/9) | ((g/9) & 0x00ff00);
-
- src += fa->src.pitch>>1;
- dst += fa->dst.pitch>>2;
- } while(--h);
- }
-
- return 0;
- }
-
- static long reduce2hq_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_reduce2hq={
- 0,0,NULL,
- "2:1 reduction (high quality)",
- "Reduces the size of each frame by 2:1 in both directions. A 3x3 overlapping matrix is used.\n\n[Assembly optimized] [MMX optimized]",
- NULL,NULL,
- 0,
- NULL,NULL,
- reduce2hq_run,
- reduce2hq_param,
- };