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/**
* Copyright (C) 2025 Niklas Haas
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SWSCALE_OPS_BACKEND_H
#define SWSCALE_OPS_BACKEND_H
/**
* Helper macros for the C-based backend.
*
* To use these macros, the following types must be defined:
* - PIXEL_TYPE should be one of SWS_PIXEL_*
* - pixel_t should be the type of pixels
* - block_t should be the type of blocks (groups of pixels)
*/
#include <assert.h>
#include <float.h>
#include <stdint.h>
#include "libavutil/attributes.h"
#include "libavutil/mem.h"
#include "ops_chain.h"
/**
* Internal context holding per-iter execution data. The data pointers will be
* directly incremented by the corresponding read/write functions.
*/
typedef struct SwsOpIter {
const uint8_t *in[4];
uint8_t *out[4];
int x, y;
} SwsOpIter;
#ifdef __clang__
# define SWS_FUNC
# define SWS_LOOP AV_PRAGMA(clang loop vectorize(assume_safety))
#elif defined(__GNUC__)
# define SWS_FUNC __attribute__((optimize("tree-vectorize")))
# define SWS_LOOP AV_PRAGMA(GCC ivdep)
#else
# define SWS_FUNC
# define SWS_LOOP
#endif
/* Miscellaneous helpers */
#define bitfn2(name, ext) name ## _ ## ext
#define bitfn(name, ext) bitfn2(name, ext)
#define FN_SUFFIX AV_JOIN(FMT_CHAR, BIT_DEPTH)
#define fn(name) bitfn(name, FN_SUFFIX)
#define av_q2pixel(q) ((q).den ? (pixel_t) (q).num / (q).den : 0)
/* Helper macros to make writing common function signatures less painful */
#define DECL_FUNC(NAME, ...) \
static av_always_inline void fn(NAME)(SwsOpIter *restrict iter, \
const SwsOpImpl *restrict impl, \
block_t x, block_t y, \
block_t z, block_t w, \
__VA_ARGS__)
#define DECL_READ(NAME, ...) \
static av_always_inline void fn(NAME)(SwsOpIter *restrict iter, \
const SwsOpImpl *restrict impl, \
const pixel_t *restrict in0, \
const pixel_t *restrict in1, \
const pixel_t *restrict in2, \
const pixel_t *restrict in3, \
__VA_ARGS__)
#define DECL_WRITE(NAME, ...) \
DECL_FUNC(NAME, pixel_t *restrict out0, pixel_t *restrict out1, \
pixel_t *restrict out2, pixel_t *restrict out3, \
__VA_ARGS__)
/* Helper macros to call into functions declared with DECL_FUNC_* */
#define CALL(FUNC, ...) \
fn(FUNC)(iter, impl, x, y, z, w, __VA_ARGS__)
#define CALL_READ(FUNC, ...) \
fn(FUNC)(iter, impl, (const pixel_t *) iter->in[0], \
(const pixel_t *) iter->in[1], \
(const pixel_t *) iter->in[2], \
(const pixel_t *) iter->in[3], __VA_ARGS__)
#define CALL_WRITE(FUNC, ...) \
CALL(FUNC, (pixel_t *) iter->out[0], (pixel_t *) iter->out[1], \
(pixel_t *) iter->out[2], (pixel_t *) iter->out[3], __VA_ARGS__)
/* Helper macros to declare continuation functions */
#define DECL_IMPL(NAME) \
static SWS_FUNC void fn(NAME)(SwsOpIter *restrict iter, \
const SwsOpImpl *restrict impl, \
block_t x, block_t y, \
block_t z, block_t w)
#define DECL_IMPL_READ(NAME) \
static SWS_FUNC void fn(NAME)(SwsOpIter *restrict iter, \
const SwsOpImpl *restrict impl)
/* Helper macro to call into the next continuation with a given type */
#define CONTINUE(TYPE, ...) \
((void (*)(SwsOpIter *, const SwsOpImpl *, \
TYPE x, TYPE y, TYPE z, TYPE w)) impl->cont) \
(iter, &impl[1], __VA_ARGS__)
/* Helper macros for common op setup code */
#define DECL_SETUP(NAME) \
static int fn(NAME)(const SwsOp *op, SwsOpPriv *out)
#define SETUP_MEMDUP(c) ff_setup_memdup(&(c), sizeof(c), out)
static inline int ff_setup_memdup(const void *c, size_t size, SwsOpPriv *out)
{
out->ptr = av_memdup(c, size);
return out->ptr ? 0 : AVERROR(ENOMEM);
}
/* Helper macro for declaring op table entries */
#define DECL_ENTRY(NAME, ...) \
static const SwsOpEntry fn(op_##NAME) = { \
.func = (SwsFuncPtr) fn(NAME), \
.type = PIXEL_TYPE, \
__VA_ARGS__ \
}
/* Helpers to define functions for common subsets of components */
#define DECL_PATTERN(NAME) \
DECL_FUNC(NAME, const bool X, const bool Y, const bool Z, const bool W)
#define WRAP_PATTERN(FUNC, X, Y, Z, W, ...) \
DECL_IMPL(FUNC##_##X##Y##Z##W) \
{ \
CALL(FUNC, X, Y, Z, W); \
} \
\
DECL_ENTRY(FUNC##_##X##Y##Z##W, \
.unused = { !X, !Y, !Z, !W }, \
__VA_ARGS__ \
)
#define WRAP_COMMON_PATTERNS(FUNC, ...) \
WRAP_PATTERN(FUNC, 1, 0, 0, 0, __VA_ARGS__); \
WRAP_PATTERN(FUNC, 1, 0, 0, 1, __VA_ARGS__); \
WRAP_PATTERN(FUNC, 1, 1, 1, 0, __VA_ARGS__); \
WRAP_PATTERN(FUNC, 1, 1, 1, 1, __VA_ARGS__)
#define REF_COMMON_PATTERNS(NAME) \
&fn(op_##NAME##_1000), \
&fn(op_##NAME##_1001), \
&fn(op_##NAME##_1110), \
&fn(op_##NAME##_1111)
#endif
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