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/*
* This file is part of the Scale2x project.
*
* Copyright (C) 2001, 2002, 2003, 2004 Andrea Mazzoleni
*
* 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.
*/
/*
* This file contains a C and MMX implementation of the Scale2x effect.
*
* You can find an high level description of the effect at :
*
* http://scale2x.sourceforge.net/
*
* Alternatively at the previous license terms, you are allowed to use this
* code in your program with these conditions:
* - the program is not used in commercial activities.
* - the whole source code of the program is released with the binary.
* - derivative works of the program are allowed.
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include "scale3x.h"
#include <assert.h>
/***************************************************************************/
/* Scale3x C implementation */
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)
{
assert(count >= 2);
/* first pixel */
dst[0] = src1[0];
dst[1] = src1[0];
if (src1[1] == src0[0] && src2[0] != src0[0])
dst[2] = src0[0];
else
dst[2] = src1[0];
++src0;
++src1;
++src2;
dst += 3;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0];
dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0];
dst[2] = src1[1] == src0[0] ? src1[1] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
--count;
}
/* last pixel */
if (src1[-1] == src0[0] && src2[0] != src0[0])
dst[0] = src0[0];
else
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
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)
{
assert(count >= 2);
/* first pixel */
dst[0] = src1[0];
dst[1] = src1[0];
if (src0[0] != src2[0]) {
dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
} else {
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
dst[1] = src1[0];
dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
--count;
}
/* last pixel */
if (src0[0] != src2[0]) {
dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
} else {
dst[0] = src1[0];
}
dst[1] = src1[0];
dst[2] = src1[0];
}
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)
{
assert(count >= 2);
/* first pixel */
dst[0] = src1[0];
dst[1] = src1[0];
if (src1[1] == src0[0] && src2[0] != src0[0])
dst[2] = src0[0];
else
dst[2] = src1[0];
++src0;
++src1;
++src2;
dst += 3;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0];
dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0];
dst[2] = src1[1] == src0[0] ? src1[1] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
--count;
}
/* last pixel */
if (src1[-1] == src0[0] && src2[0] != src0[0])
dst[0] = src0[0];
else
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
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)
{
assert(count >= 2);
/* first pixel */
dst[0] = src1[0];
dst[1] = src1[0];
if (src0[0] != src2[0]) {
dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
} else {
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
dst[1] = src1[0];
dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
--count;
}
/* last pixel */
if (src0[0] != src2[0]) {
dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
} else {
dst[0] = src1[0];
}
dst[1] = src1[0];
dst[2] = src1[0];
}
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)
{
assert(count >= 2);
/* first pixel */
dst[0] = src1[0];
dst[1] = src1[0];
if (src1[1] == src0[0] && src2[0] != src0[0])
dst[2] = src0[0];
else
dst[2] = src1[0];
++src0;
++src1;
++src2;
dst += 3;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0];
dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0];
dst[2] = src1[1] == src0[0] ? src1[1] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
--count;
}
/* last pixel */
if (src1[-1] == src0[0] && src2[0] != src0[0])
dst[0] = src0[0];
else
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
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)
{
assert(count >= 2);
/* first pixel */
dst[0] = src1[0];
dst[1] = src1[0];
if (src0[0] != src2[0]) {
dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
} else {
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
dst[1] = src1[0];
dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
dst[2] = src1[0];
}
++src0;
++src1;
++src2;
dst += 3;
--count;
}
/* last pixel */
if (src0[0] != src2[0]) {
dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0];
} else {
dst[0] = src1[0];
}
dst[1] = src1[0];
dst[2] = src1[0];
}
/**
* Scale by a factor of 3 a row of pixels of 8 bits.
* The function is implemented in C.
* The pixels over the left and right borders are assumed of the same color of
* the pixels on the border.
* \param src0 Pointer at the first pixel of the previous row.
* \param src1 Pointer at the first pixel of the current row.
* \param src2 Pointer at the first pixel of the next row.
* \param count Length in pixels of the src0, src1 and src2 rows.
* It must be at least 2.
* \param dst0 First destination row, triple length in pixels.
* \param dst1 Second destination row, triple length in pixels.
* \param dst2 Third destination row, triple length in pixels.
*/
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)
{
assert(count >= 2);
scale3x_8_def_border(dst0, src0, src1, src2, count);
scale3x_8_def_center(dst1, src0, src1, src2, count);
scale3x_8_def_border(dst2, src2, src1, src0, count);
}
/**
* Scale by a factor of 3 a row of pixels of 16 bits.
* This function operates like scale3x_8_def() but for 16 bits pixels.
* \param src0 Pointer at the first pixel of the previous row.
* \param src1 Pointer at the first pixel of the current row.
* \param src2 Pointer at the first pixel of the next row.
* \param count Length in pixels of the src0, src1 and src2 rows.
* It must be at least 2.
* \param dst0 First destination row, triple length in pixels.
* \param dst1 Second destination row, triple length in pixels.
* \param dst2 Third destination row, triple length in pixels.
*/
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)
{
assert(count >= 2);
scale3x_16_def_border(dst0, src0, src1, src2, count);
scale3x_16_def_center(dst1, src0, src1, src2, count);
scale3x_16_def_border(dst2, src2, src1, src0, count);
}
/**
* Scale by a factor of 3 a row of pixels of 32 bits.
* This function operates like scale3x_8_def() but for 32 bits pixels.
* \param src0 Pointer at the first pixel of the previous row.
* \param src1 Pointer at the first pixel of the current row.
* \param src2 Pointer at the first pixel of the next row.
* \param count Length in pixels of the src0, src1 and src2 rows.
* It must be at least 2.
* \param dst0 First destination row, triple length in pixels.
* \param dst1 Second destination row, triple length in pixels.
* \param dst2 Third destination row, triple length in pixels.
*/
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)
{
assert(count >= 2);
scale3x_32_def_border(dst0, src0, src1, src2, count);
scale3x_32_def_center(dst1, src0, src1, src2, count);
scale3x_32_def_border(dst2, src2, src1, src0, count);
}
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