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scale2x.c
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/*
* This file is part of the Scale2x project.
*
* Copyright (C) 2001, 2002, 2003, 2004 Andrea Mazzoleni
* Copyright (C) 2015 Thomas Bernard
*
* 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.
*/
/*
* This file contains a C and SSE2 implementation of the Scale2x effect.
*
* You can find an high level description of the effect at :
*
* http://www.scale2x.it/
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include "scale2x.h"
#include <assert.h>
/***************************************************************************/
/* Scale2x C implementation */
static inline void scale2x_8_def_border(scale2x_uint8* restrict dst, const scale2x_uint8* restrict src0, const scale2x_uint8* restrict src1, const scale2x_uint8* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst[0] = src1[0] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
++src0;
++src1;
++src2;
dst += 2;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
++src0;
++src1;
++src2;
dst += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[0] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
}
static inline void scale2x_8_def_center(scale2x_uint8* restrict dst, const scale2x_uint8* restrict src0, const scale2x_uint8* restrict src1, const scale2x_uint8* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst[0] = src1[0];
dst[1] = (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];
}
++src0;
++src1;
++src2;
dst += 2;
/* 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[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];
}
++src0;
++src1;
++src2;
dst += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
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];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
}
static inline void scale2x_16_def_border(scale2x_uint16* restrict dst, const scale2x_uint16* restrict src0, const scale2x_uint16* restrict src1, const scale2x_uint16* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst[0] = src1[0] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
++src0;
++src1;
++src2;
dst += 2;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
++src0;
++src1;
++src2;
dst += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[0] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
}
static inline void scale2x_16_def_center(scale2x_uint16* restrict dst, const scale2x_uint16* restrict src0, const scale2x_uint16* restrict src1, const scale2x_uint16* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst[0] = src1[0];
dst[1] = (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];
}
++src0;
++src1;
++src2;
dst += 2;
/* 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[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];
}
++src0;
++src1;
++src2;
dst += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
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];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
}
static inline void scale2x_32_def_border(scale2x_uint32* restrict dst, const scale2x_uint32* restrict src0, const scale2x_uint32* restrict src1, const scale2x_uint32* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst[0] = src1[0] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
++src0;
++src1;
++src2;
dst += 2;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
++src0;
++src1;
++src2;
dst += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst[1] = src1[0] == src0[0] ? src0[0] : src1[0];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
}
static inline void scale2x_32_def_center(scale2x_uint32* restrict dst, const scale2x_uint32* restrict src0, const scale2x_uint32* restrict src1, const scale2x_uint32* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst[0] = src1[0];
dst[1] = (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];
}
++src0;
++src1;
++src2;
dst += 2;
/* 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[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];
}
++src0;
++src1;
++src2;
dst += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
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];
} else {
dst[0] = src1[0];
dst[1] = src1[0];
}
}
/**
* Scale by a factor of 2 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.
* Note that the implementation is optimized to write data sequentially to
* maximize the bandwidth on video memory.
* \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, double length in pixels.
* \param dst1 Second destination row, double length in pixels.
*/
void scale2x_8_def(scale2x_uint8* dst0, scale2x_uint8* dst1, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
{
scale2x_8_def_border(dst0, src0, src1, src2, count);
scale2x_8_def_border(dst1, src2, src1, src0, count);
}
/**
* Scale by a factor of 2 a row of pixels of 16 bits.
* This function operates like scale2x_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, double length in pixels.
* \param dst1 Second destination row, double length in pixels.
*/
void scale2x_16_def(scale2x_uint16* dst0, scale2x_uint16* dst1, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
{
scale2x_16_def_border(dst0, src0, src1, src2, count);
scale2x_16_def_border(dst1, src2, src1, src0, count);
}
/**
* Scale by a factor of 2 a row of pixels of 32 bits.
* This function operates like scale2x_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, double length in pixels.
* \param dst1 Second destination row, double length in pixels.
*/
void scale2x_32_def(scale2x_uint32* dst0, scale2x_uint32* dst1, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
{
scale2x_32_def_border(dst0, src0, src1, src2, count);
scale2x_32_def_border(dst1, src2, src1, src0, count);
}
/**
* Scale by a factor of 2x3 a row of pixels of 8 bits.
* \note Like scale2x_8_def();
*/
void scale2x3_8_def(scale2x_uint8* dst0, scale2x_uint8* dst1, scale2x_uint8* dst2, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
{
scale2x_8_def_border(dst0, src0, src1, src2, count);
scale2x_8_def_center(dst1, src0, src1, src2, count);
scale2x_8_def_border(dst2, src2, src1, src0, count);
}
/**
* Scale by a factor of 2x3 a row of pixels of 16 bits.
* \note Like scale2x_16_def();
*/
void scale2x3_16_def(scale2x_uint16* dst0, scale2x_uint16* dst1, scale2x_uint16* dst2, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
{
scale2x_16_def_border(dst0, src0, src1, src2, count);
scale2x_16_def_center(dst1, src0, src1, src2, count);
scale2x_16_def_border(dst2, src2, src1, src0, count);
}
/**
* Scale by a factor of 2x3 a row of pixels of 32 bits.
* \note Like scale2x_32_def();
*/
void scale2x3_32_def(scale2x_uint32* dst0, scale2x_uint32* dst1, scale2x_uint32* dst2, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
{
scale2x_32_def_border(dst0, src0, src1, src2, count);
scale2x_32_def_center(dst1, src0, src1, src2, count);
scale2x_32_def_border(dst2, src2, src1, src0, count);
}
/**
* Scale by a factor of 2x4 a row of pixels of 8 bits.
* \note Like scale2x_8_def();
*/
void scale2x4_8_def(scale2x_uint8* dst0, scale2x_uint8* dst1, scale2x_uint8* dst2, scale2x_uint8* dst3, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
{
scale2x_8_def_border(dst0, src0, src1, src2, count);
scale2x_8_def_center(dst1, src0, src1, src2, count);
scale2x_8_def_center(dst2, src0, src1, src2, count);
scale2x_8_def_border(dst3, src2, src1, src0, count);
}
/**
* Scale by a factor of 2x4 a row of pixels of 16 bits.
* \note Like scale2x_16_def();
*/
void scale2x4_16_def(scale2x_uint16* dst0, scale2x_uint16* dst1, scale2x_uint16* dst2, scale2x_uint16* dst3, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
{
scale2x_16_def_border(dst0, src0, src1, src2, count);
scale2x_16_def_center(dst1, src0, src1, src2, count);
scale2x_16_def_center(dst2, src0, src1, src2, count);
scale2x_16_def_border(dst3, src2, src1, src0, count);
}
/**
* Scale by a factor of 2x4 a row of pixels of 32 bits.
* \note Like scale2x_32_def();
*/
void scale2x4_32_def(scale2x_uint32* dst0, scale2x_uint32* dst1, scale2x_uint32* dst2, scale2x_uint32* dst3, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
{
scale2x_32_def_border(dst0, src0, src1, src2, count);
scale2x_32_def_center(dst1, src0, src1, src2, count);
scale2x_32_def_center(dst2, src0, src1, src2, count);
scale2x_32_def_border(dst3, src2, src1, src0, count);
}
/***************************************************************************/
/* Scale2x MEMORY implementation */
/*
* Optimized version that writes memory in random order.
*
* This version can operate at double speed if you write in system memory.
* But it's a lot slower if you write in video memory, because it writes
* memory in two different locations at the same time, messing up with the
* video memory write combining.
*
* Use it only if you are sure to never write directly in video memory.
*/
static inline void scale2x_8_mem_whole(scale2x_uint8* restrict dst0, scale2x_uint8* restrict dst1, const scale2x_uint8* restrict src0, const scale2x_uint8* restrict src1, const scale2x_uint8* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst0[0] = src1[0] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[1] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[0] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[1] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
++src0;
++src1;
++src2;
dst0 += 2;
dst1 += 2;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst0[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[1] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[-1] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[1] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
++src0;
++src1;
++src2;
dst0 += 2;
dst1 += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
dst0[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[0] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[-1] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[0] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
}
static inline void scale2x_16_mem_whole(scale2x_uint16* restrict dst0, scale2x_uint16* restrict dst1, const scale2x_uint16* restrict src0, const scale2x_uint16* restrict src1, const scale2x_uint16* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst0[0] = src1[0] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[1] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[0] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[1] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
++src0;
++src1;
++src2;
dst0 += 2;
dst1 += 2;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst0[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[1] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[-1] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[1] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
++src0;
++src1;
++src2;
dst0 += 2;
dst1 += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
dst0[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[0] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[-1] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[0] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
}
static inline void scale2x_32_mem_whole(scale2x_uint32* restrict dst0, scale2x_uint32* restrict dst1, const scale2x_uint32* restrict src0, const scale2x_uint32* restrict src1, const scale2x_uint32* restrict src2, unsigned count)
{
assert(count >= 2);
/* first pixel */
if (src0[0] != src2[0] && src1[0] != src1[1]) {
dst0[0] = src1[0] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[1] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[0] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[1] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
++src0;
++src1;
++src2;
dst0 += 2;
dst1 += 2;
/* central pixels */
count -= 2;
while (count) {
if (src0[0] != src2[0] && src1[-1] != src1[1]) {
dst0[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[1] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[-1] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[1] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
++src0;
++src1;
++src2;
dst0 += 2;
dst1 += 2;
--count;
}
/* last pixel */
if (src0[0] != src2[0] && src1[-1] != src1[0]) {
dst0[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
dst0[1] = src1[0] == src0[0] ? src0[0] : src1[0];
dst1[0] = src1[-1] == src2[0] ? src2[0] : src1[0];
dst1[1] = src1[0] == src2[0] ? src2[0] : src1[0];
} else {
dst0[0] = src1[0];
dst0[1] = src1[0];
dst1[0] = src1[0];
dst1[1] = src1[0];
}
}
/**
* Scale by a factor of 2 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.
* Note that the implementation is optimized to write data sequentially to
* maximize the bandwidth on video memory.
* \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, double length in pixels.
* \param dst1 Second destination row, double length in pixels.
*/
void scale2x_8_mem(scale2x_uint8* dst0, scale2x_uint8* dst1, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
{
scale2x_8_mem_whole(dst0, dst1, src0, src1, src2, count);
}
/**
* Scale by a factor of 2 a row of pixels of 16 bits.
* This function operates like scale2x_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, double length in pixels.
* \param dst1 Second destination row, double length in pixels.
*/
void scale2x_16_mem(scale2x_uint16* dst0, scale2x_uint16* dst1, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
{
scale2x_16_mem_whole(dst0, dst1, src0, src1, src2, count);
}
/**
* Scale by a factor of 2 a row of pixels of 32 bits.
* This function operates like scale2x_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, double length in pixels.
* \param dst1 Second destination row, double length in pixels.
*/
void scale2x_32_mem(scale2x_uint32* dst0, scale2x_uint32* dst1, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
{
scale2x_32_mem_whole(dst0, dst1, src0, src1, src2, count);
}
/**
* Scale by a factor of 2x3 a row of pixels of 8 bits.
* \note Like scale2x_8_def();
*/
void scale2x3_8_mem(scale2x_uint8* dst0, scale2x_uint8* dst1, scale2x_uint8* dst2, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
{
scale2x_8_mem_whole(dst0, dst2, src0, src1, src2, count);
scale2x_8_def_center(dst1, src0, src1, src2, count);
}
/**
* Scale by a factor of 2x3 a row of pixels of 16 bits.
* \note Like scale2x_16_def();
*/
void scale2x3_16_mem(scale2x_uint16* dst0, scale2x_uint16* dst1, scale2x_uint16* dst2, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
{
scale2x_16_mem_whole(dst0, dst2, src0, src1, src2, count);
scale2x_16_def_center(dst1, src0, src1, src2, count);
}
/**
* Scale by a factor of 2x3 a row of pixels of 32 bits.
* \note Like scale2x_32_def();
*/
void scale2x3_32_mem(scale2x_uint32* dst0, scale2x_uint32* dst1, scale2x_uint32* dst2, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
{
scale2x_32_mem_whole(dst0, dst2, src0, src1, src2, count);
scale2x_32_def_center(dst1, src0, src1, src2, count);
}
/**
* Scale by a factor of 2x4 a row of pixels of 8 bits.
* \note Like scale2x_8_def();
*/
void scale2x4_8_mem(scale2x_uint8* dst0, scale2x_uint8* dst1, scale2x_uint8* dst2, scale2x_uint8* dst3, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
{
scale2x_8_mem_whole(dst0, dst3, src0, src1, src2, count);
scale2x_8_def_center(dst1, src0, src1, src2, count);
scale2x_8_def_center(dst2, src0, src1, src2, count);
}
/**
* Scale by a factor of 2x4 a row of pixels of 16 bits.
* \note Like scale2x_16_def();
*/
void scale2x4_16_mem(scale2x_uint16* dst0, scale2x_uint16* dst1, scale2x_uint16* dst2, scale2x_uint16* dst3, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
{
scale2x_16_mem_whole(dst0, dst3, src0, src1, src2, count);
scale2x_16_def_center(dst1, src0, src1, src2, count);
scale2x_16_def_center(dst2, src0, src1, src2, count);
}
/**
* Scale by a factor of 2x4 a row of pixels of 32 bits.
* \note Like scale2x_32_def();
*/
void scale2x4_32_mem(scale2x_uint32* dst0, scale2x_uint32* dst1, scale2x_uint32* dst2, scale2x_uint32* dst3, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
{
scale2x_32_mem_whole(dst0, dst3, src0, src1, src2, count);
scale2x_32_def_center(dst1, src0, src1, src2, count);
scale2x_32_def_center(dst2, src0, src1, src2, count);
}
/***************************************************************************/
/* Scale2x SSE2 implementation */
#ifdef USE_SCALE2X_SSE2
/*
* Apply the Scale2x effect at a single row.
* This function must be called only by the other scale2x functions.
*
* Considering the pixel map :
*
* ABC (src0)
* DEF (src1)
* GHI (src2)
*
* this functions compute 2 new pixels in substitution of the source pixel E
* like this map :
*
* ab (dst)
*/
/**
* Include SSE2 intrinsics.
*
* A nice reference is available at:
* https://software.intel.com/sites/landingpage/IntrinsicsGuide/
*/
#include <emmintrin.h>
/**
* SCALE2X_SEL(A, B, cond) = cond ? A : B;
*/
#define SCALE2X_SEL(A, B, cond) \
_mm_or_si128(_mm_and_si128((cond), (A)), _mm_andnot_si128((cond), (B)))
static inline void scale2x_8_sse2_border(scale2x_uint8* dst, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
{
__m128i B, D, E, F, H, a, b;
__m128i BDeq, BFeq, BHeq, DFeq;
const __m128i mask_first = _mm_set_epi8(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff);
const __m128i mask_last = _mm_set_epi8(0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
const __m128i* s0 = (const __m128i*)src0;
const __m128i* s1 = (const __m128i*)src1;
const __m128i* s2 = (const __m128i*)src2;
__m128i* d = (__m128i*)dst;
/* count must be aligned */
assert(count >= 32);
assert(count % 16 == 0);
/* all memory must be aligned */
assert(scale2x_align_ptr(dst) == dst);
assert(scale2x_align_ptr(src0) == src0);
assert(scale2x_align_ptr(src1) == src1);
assert(scale2x_align_ptr(src2) == src2);
/* first run */
B = s0[0];
E = s1[0];
H = s2[0];
D = _mm_or_si128(_mm_and_si128(E, mask_first), _mm_slli_si128(E, 1));
F = _mm_or_si128(_mm_srli_si128(E, 1), _mm_slli_si128(s1[1], 15));
++s0;
++s1;
++s2;
BDeq = _mm_cmpeq_epi8(B, D);
BFeq = _mm_cmpeq_epi8(B, F);
BHeq = _mm_cmpeq_epi8(B, H);
DFeq = _mm_cmpeq_epi8(D, F);
a = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BDeq)));
b = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BFeq)));
d[0] = _mm_unpacklo_epi8(a, b);
d[1] = _mm_unpackhi_epi8(a, b);
d += 2;
/* central run */
for (count -= 32; count > 0; count -= 16) {
B = s0[0];
E = s1[0];
H = s2[0];
D = _mm_or_si128(_mm_srli_si128(s1[-1], 15), _mm_slli_si128(E, 1));
F = _mm_or_si128(_mm_srli_si128(E, 1), _mm_slli_si128(s1[1], 15));
++s0;
++s1;
++s2;
BDeq = _mm_cmpeq_epi8(B, D);
BFeq = _mm_cmpeq_epi8(B, F);
BHeq = _mm_cmpeq_epi8(B, H);
DFeq = _mm_cmpeq_epi8(D, F);
a = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BDeq)));
b = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BFeq)));
d[0] = _mm_unpacklo_epi8(a, b);
d[1] = _mm_unpackhi_epi8(a, b);
d += 2;
}
/* last run */
B = s0[0];
E = s1[0];
H = s2[0];
D = _mm_or_si128(_mm_srli_si128(s1[-1], 15), _mm_slli_si128(E, 1));
F = _mm_or_si128(_mm_srli_si128(E, 1), _mm_and_si128(E, mask_last));
BDeq = _mm_cmpeq_epi8(B, D);
BFeq = _mm_cmpeq_epi8(B, F);
BHeq = _mm_cmpeq_epi8(B, H);
DFeq = _mm_cmpeq_epi8(D, F);
a = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BDeq)));
b = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BFeq)));
d[0] = _mm_unpacklo_epi8(a, b);
d[1] = _mm_unpackhi_epi8(a, b);
}
static inline void scale2x_16_sse2_border(scale2x_uint16* dst, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
{
__m128i B, D, E, F, H, a, b;
__m128i BDeq, BFeq, BHeq, DFeq;
const __m128i mask_first = _mm_set_epi16(0, 0, 0, 0, 0, 0, 0, 0xffff);
const __m128i mask_last = _mm_set_epi16(0xffff, 0, 0, 0, 0, 0, 0, 0);
const __m128i* s0 = (const __m128i*)src0;
const __m128i* s1 = (const __m128i*)src1;
const __m128i* s2 = (const __m128i*)src2;
__m128i* d = (__m128i*)dst;
/* count must be aligned */
assert(count >= 16);
assert(count % 8 == 0);
/* all memory must be aligned */
assert(scale2x_align_ptr(dst) == dst);
assert(scale2x_align_ptr(src0) == src0);
assert(scale2x_align_ptr(src1) == src1);
assert(scale2x_align_ptr(src2) == src2);
/* first run */
B = s0[0];
E = s1[0];
H = s2[0];
D = _mm_or_si128(_mm_and_si128(E, mask_first), _mm_slli_si128(E, 2));
F = _mm_or_si128(_mm_srli_si128(E, 2), _mm_slli_si128(s1[1], 14));
++s0;
++s1;
++s2;
BDeq = _mm_cmpeq_epi16(B, D);
BFeq = _mm_cmpeq_epi16(B, F);
BHeq = _mm_cmpeq_epi16(B, H);
DFeq = _mm_cmpeq_epi16(D, F);
a = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BDeq)));
b = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BFeq)));
d[0] = _mm_unpacklo_epi16(a, b);
d[1] = _mm_unpackhi_epi16(a, b);
d += 2;
/* central run */
for (count -= 16; count > 0; count -= 8) {
B = s0[0];
E = s1[0];
H = s2[0];
D = _mm_or_si128(_mm_srli_si128(s1[-1], 14), _mm_slli_si128(E, 2));
F = _mm_or_si128(_mm_srli_si128(E, 2), _mm_slli_si128(s1[1], 14));
++s0;
++s1;
++s2;
BDeq = _mm_cmpeq_epi16(B, D);
BFeq = _mm_cmpeq_epi16(B, F);
BHeq = _mm_cmpeq_epi16(B, H);
DFeq = _mm_cmpeq_epi16(D, F);
a = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BDeq)));
b = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BFeq)));
d[0] = _mm_unpacklo_epi16(a, b);
d[1] = _mm_unpackhi_epi16(a, b);
d += 2;
}
/* last run */
B = s0[0];
E = s1[0];
H = s2[0];
D = _mm_or_si128(_mm_srli_si128(s1[-1], 14), _mm_slli_si128(E, 2));
F = _mm_or_si128(_mm_srli_si128(E, 2), _mm_and_si128(E, mask_last));
BDeq = _mm_cmpeq_epi16(B, D);
BFeq = _mm_cmpeq_epi16(B, F);
BHeq = _mm_cmpeq_epi16(B, H);
DFeq = _mm_cmpeq_epi16(D, F);
a = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BDeq)));
b = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BFeq)));
d[0] = _mm_unpacklo_epi16(a, b);
d[1] = _mm_unpackhi_epi16(a, b);
}
static inline void scale2x_32_sse2_border(scale2x_uint32* dst, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
{
__m128i B, D, E, F, H, a, b;
__m128i BDeq, BFeq, BHeq, DFeq;
const __m128i mask_first = _mm_set_epi32(0, 0, 0, 0xffffffff);
const __m128i mask_last = _mm_set_epi32(0xffffffff, 0, 0, 0);
const __m128i* s0 = (const __m128i*)src0;
const __m128i* s1 = (const __m128i*)src1;
const __m128i* s2 = (const __m128i*)src2;
__m128i* d = (__m128i*)dst;
/* count must be aligned */
assert(count >= 8);
assert(count % 4 == 0);
/* memory must be aligned */
assert(scale2x_align_ptr(dst) == dst);
assert(scale2x_align_ptr(src0) == src0);
assert(scale2x_align_ptr(src1) == src1);
assert(scale2x_align_ptr(src2) == src2);
/* first run */
B = s0[0];
E = s1[0];
H = s2[0];
D = _mm_or_si128(_mm_and_si128(E, mask_first), _mm_slli_si128(E, 4));
F = _mm_or_si128(_mm_srli_si128(E, 4), _mm_slli_si128(s1[1], 12));
++s0;
++s1;
++s2;
BDeq = _mm_cmpeq_epi32(B, D);
BFeq = _mm_cmpeq_epi32(B, F);
BHeq = _mm_cmpeq_epi32(B, H);
DFeq = _mm_cmpeq_epi32(D, F);
a = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BDeq)));
b = SCALE2X_SEL(B, E, _mm_andnot_si128(DFeq, _mm_andnot_si128(BHeq, BFeq)));
d[0] = _mm_unpacklo_epi32(a, b);
d[1] = _mm_unpackhi_epi32(a, b);
d += 2;
/* central run */
for (count -= 8; count > 0; count -= 4) {
B = s0[0];
E = s1[0];
H = s2[0];
D = _mm_or_si128(_mm_srli_si128(s1[-1], 12), _mm_slli_si128(E, 4));
F = _mm_or_si128(_mm_srli_si128(E, 4), _mm_slli_si128(s1[1], 12));
++s0;
++s1;
++s2;
BDeq = _mm_cmpeq_epi32(B, D);
BFeq = _mm_cmpeq_epi32(B, F);
BHeq = _mm_cmpeq_epi32(B, H);
DFeq = _mm_cmpeq_epi32(D, F);