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383 lines
11 KiB
C
383 lines
11 KiB
C
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/*
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* This file is part of the Scale2x project.
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*
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* Copyright (C) 2001, 2002, 2003, 2004 Andrea Mazzoleni
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* This file contains a C and MMX implementation of the Scale2x effect.
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*
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* You can find an high level description of the effect at :
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*
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* http://scale2x.sourceforge.net/
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*
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* Alternatively at the previous license terms, you are allowed to use this
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* code in your program with these conditions:
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* - the program is not used in commercial activities.
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* - the whole source code of the program is released with the binary.
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* - derivative works of the program are allowed.
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*/
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#include "scale3x.h"
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#include <assert.h>
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/***************************************************************************/
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/* Scale3x C implementation */
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static inline void scale3x_8_def_border(scale3x_uint8* __restrict__ dst, const scale3x_uint8* __restrict__ src0, const scale3x_uint8* __restrict__ src1, const scale3x_uint8* __restrict__ src2, unsigned count)
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{
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assert(count >= 2);
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/* first pixel */
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dst[0] = src1[0];
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dst[1] = src1[0];
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if (src1[1] == src0[0] && src2[0] != src0[0])
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dst[2] = src0[0];
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else
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dst[2] = src1[0];
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++src0;
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++src1;
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++src2;
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dst += 3;
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/* central pixels */
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count -= 2;
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0];
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dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0];
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dst[2] = src1[1] == src0[0] ? src1[1] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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--count;
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}
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/* last pixel */
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if (src1[-1] == src0[0] && src2[0] != src0[0])
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dst[0] = src0[0];
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else
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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static inline void scale3x_8_def_center(scale3x_uint8* __restrict__ dst, const scale3x_uint8* __restrict__ src0, const scale3x_uint8* __restrict__ src1, const scale3x_uint8* __restrict__ src2, unsigned count)
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{
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assert(count >= 2);
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/* first pixel */
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dst[0] = src1[0];
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dst[1] = src1[0];
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if (src0[0] != src2[0]) {
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dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
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} else {
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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/* central pixels */
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count -= 2;
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
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dst[1] = src1[0];
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dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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--count;
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}
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/* last pixel */
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if (src0[0] != src2[0]) {
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dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
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} else {
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dst[0] = src1[0];
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}
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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static inline void scale3x_16_def_border(scale3x_uint16* __restrict__ dst, const scale3x_uint16* __restrict__ src0, const scale3x_uint16* __restrict__ src1, const scale3x_uint16* __restrict__ src2, unsigned count)
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{
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assert(count >= 2);
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/* first pixel */
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dst[0] = src1[0];
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dst[1] = src1[0];
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if (src1[1] == src0[0] && src2[0] != src0[0])
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dst[2] = src0[0];
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else
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dst[2] = src1[0];
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++src0;
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++src1;
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++src2;
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dst += 3;
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/* central pixels */
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count -= 2;
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0];
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dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0];
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dst[2] = src1[1] == src0[0] ? src1[1] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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--count;
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}
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/* last pixel */
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if (src1[-1] == src0[0] && src2[0] != src0[0])
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dst[0] = src0[0];
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else
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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static inline void scale3x_16_def_center(scale3x_uint16* __restrict__ dst, const scale3x_uint16* __restrict__ src0, const scale3x_uint16* __restrict__ src1, const scale3x_uint16* __restrict__ src2, unsigned count)
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{
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assert(count >= 2);
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/* first pixel */
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dst[0] = src1[0];
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dst[1] = src1[0];
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if (src0[0] != src2[0]) {
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dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
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} else {
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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/* central pixels */
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count -= 2;
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
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dst[1] = src1[0];
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dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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--count;
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}
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/* last pixel */
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if (src0[0] != src2[0]) {
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dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
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} else {
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dst[0] = src1[0];
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}
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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static inline void scale3x_32_def_border(scale3x_uint32* __restrict__ dst, const scale3x_uint32* __restrict__ src0, const scale3x_uint32* __restrict__ src1, const scale3x_uint32* __restrict__ src2, unsigned count)
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{
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assert(count >= 2);
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/* first pixel */
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dst[0] = src1[0];
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dst[1] = src1[0];
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if (src1[1] == src0[0] && src2[0] != src0[0])
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dst[2] = src0[0];
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else
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dst[2] = src1[0];
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++src0;
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++src1;
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++src2;
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dst += 3;
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/* central pixels */
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count -= 2;
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0];
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dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0];
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dst[2] = src1[1] == src0[0] ? src1[1] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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--count;
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}
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/* last pixel */
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if (src1[-1] == src0[0] && src2[0] != src0[0])
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dst[0] = src0[0];
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else
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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static inline void scale3x_32_def_center(scale3x_uint32* __restrict__ dst, const scale3x_uint32* __restrict__ src0, const scale3x_uint32* __restrict__ src1, const scale3x_uint32* __restrict__ src2, unsigned count)
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{
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assert(count >= 2);
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/* first pixel */
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dst[0] = src1[0];
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dst[1] = src1[0];
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if (src0[0] != src2[0]) {
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dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
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} else {
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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/* central pixels */
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count -= 2;
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
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dst[1] = src1[0];
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dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 3;
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--count;
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}
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/* last pixel */
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if (src0[0] != src2[0]) {
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dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
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} else {
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dst[0] = src1[0];
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}
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dst[1] = src1[0];
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dst[2] = src1[0];
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}
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/**
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* Scale by a factor of 3 a row of pixels of 8 bits.
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* The function is implemented in C.
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* The pixels over the left and right borders are assumed of the same color of
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* the pixels on the border.
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* \param src0 Pointer at the first pixel of the previous row.
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* \param src1 Pointer at the first pixel of the current row.
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* \param src2 Pointer at the first pixel of the next row.
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* \param count Length in pixels of the src0, src1 and src2 rows.
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* It must be at least 2.
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* \param dst0 First destination row, triple length in pixels.
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* \param dst1 Second destination row, triple length in pixels.
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* \param dst2 Third destination row, triple length in pixels.
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*/
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void scale3x_8_def(scale3x_uint8* dst0, scale3x_uint8* dst1, scale3x_uint8* dst2, const scale3x_uint8* src0, const scale3x_uint8* src1, const scale3x_uint8* src2, unsigned count)
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{
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assert(count >= 2);
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scale3x_8_def_border(dst0, src0, src1, src2, count);
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scale3x_8_def_center(dst1, src0, src1, src2, count);
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scale3x_8_def_border(dst2, src2, src1, src0, count);
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}
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/**
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* Scale by a factor of 3 a row of pixels of 16 bits.
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* This function operates like scale3x_8_def() but for 16 bits pixels.
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* \param src0 Pointer at the first pixel of the previous row.
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* \param src1 Pointer at the first pixel of the current row.
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* \param src2 Pointer at the first pixel of the next row.
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* \param count Length in pixels of the src0, src1 and src2 rows.
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* It must be at least 2.
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* \param dst0 First destination row, triple length in pixels.
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* \param dst1 Second destination row, triple length in pixels.
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* \param dst2 Third destination row, triple length in pixels.
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*/
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void scale3x_16_def(scale3x_uint16* dst0, scale3x_uint16* dst1, scale3x_uint16* dst2, const scale3x_uint16* src0, const scale3x_uint16* src1, const scale3x_uint16* src2, unsigned count)
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{
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assert(count >= 2);
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scale3x_16_def_border(dst0, src0, src1, src2, count);
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scale3x_16_def_center(dst1, src0, src1, src2, count);
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scale3x_16_def_border(dst2, src2, src1, src0, count);
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}
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/**
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* Scale by a factor of 3 a row of pixels of 32 bits.
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* This function operates like scale3x_8_def() but for 32 bits pixels.
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* \param src0 Pointer at the first pixel of the previous row.
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* \param src1 Pointer at the first pixel of the current row.
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* \param src2 Pointer at the first pixel of the next row.
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* \param count Length in pixels of the src0, src1 and src2 rows.
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* It must be at least 2.
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* \param dst0 First destination row, triple length in pixels.
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* \param dst1 Second destination row, triple length in pixels.
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* \param dst2 Third destination row, triple length in pixels.
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*/
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void scale3x_32_def(scale3x_uint32* dst0, scale3x_uint32* dst1, scale3x_uint32* dst2, const scale3x_uint32* src0, const scale3x_uint32* src1, const scale3x_uint32* src2, unsigned count)
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{
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assert(count >= 2);
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scale3x_32_def_border(dst0, src0, src1, src2, count);
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scale3x_32_def_center(dst1, src0, src1, src2, count);
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scale3x_32_def_border(dst2, src2, src1, src0, count);
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}
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