/src/ffmpeg/libswscale/ops_backend.h

Source
/**
 * 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

Line	Count	Source
1		/**
2		* Copyright (C) 2025 Niklas Haas
3		*
4		* This file is part of FFmpeg.
5		*
6		* FFmpeg is free software; you can redistribute it and/or
7		* modify it under the terms of the GNU Lesser General Public
8		* License as published by the Free Software Foundation; either
9		* version 2.1 of the License, or (at your option) any later version.
10		*
11		* FFmpeg is distributed in the hope that it will be useful,
12		* but WITHOUT ANY WARRANTY; without even the implied warranty of
13		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14		* Lesser General Public License for more details.
15		*
16		* You should have received a copy of the GNU Lesser General Public
17		* License along with FFmpeg; if not, write to the Free Software
18		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19		*/
20
21		#ifndef SWSCALE_OPS_BACKEND_H
22		#define SWSCALE_OPS_BACKEND_H
23
24		/**
25		* Helper macros for the C-based backend.
26		*
27		* To use these macros, the following types must be defined:
28		* - PIXEL_TYPE should be one of SWS_PIXEL_*
29		* - pixel_t should be the type of pixels
30		* - block_t should be the type of blocks (groups of pixels)
31		*/
32
33		#include <assert.h>
34		#include <float.h>
35		#include <stdint.h>
36
37		#include "libavutil/attributes.h"
38		#include "libavutil/mem.h"
39
40		#include "ops_chain.h"
41
42		/**
43		* Internal context holding per-iter execution data. The data pointers will be
44		* directly incremented by the corresponding read/write functions.
45		*/
46		typedef struct SwsOpIter {
47		const uint8_t *in[4];
48		uint8_t *out[4];
49		int x, y;
50		} SwsOpIter;
51
52		#ifdef __clang__
53		# define SWS_FUNC
54	0	# define SWS_LOOP AV_PRAGMA(clang loop vectorize(assume_safety))
55		#elif defined(__GNUC__)
56		# define SWS_FUNC __attribute__((optimize("tree-vectorize")))
57		# define SWS_LOOP AV_PRAGMA(GCC ivdep)
58		#else
59		# define SWS_FUNC
60		# define SWS_LOOP
61		#endif
62
63		/* Miscellaneous helpers */
64	0	#define bitfn2(name, ext) name ## _ ## ext
65	0	#define bitfn(name, ext) bitfn2(name, ext)
66
67		#define FN_SUFFIX AV_JOIN(FMT_CHAR, BIT_DEPTH)
68	0	#define fn(name) bitfn(name, FN_SUFFIX)
69
70	0	#define av_q2pixel(q) ((q).den ? (pixel_t) (q).num / (q).den : 0)
71
72		/* Helper macros to make writing common function signatures less painful */
73		#define DECL_FUNC(NAME, ...) \
74		static av_always_inline void fn(NAME)(SwsOpIter *restrict iter, \
75		const SwsOpImpl *restrict impl, \
76		block_t x, block_t y, \
77		block_t z, block_t w, \
78		__VA_ARGS__)
79
80		#define DECL_READ(NAME, ...) \
81		static av_always_inline void fn(NAME)(SwsOpIter *restrict iter, \
82		const SwsOpImpl *restrict impl, \
83		const pixel_t *restrict in0, \
84		const pixel_t *restrict in1, \
85		const pixel_t *restrict in2, \
86		const pixel_t *restrict in3, \
87		__VA_ARGS__)
88
89		#define DECL_WRITE(NAME, ...) \
90		DECL_FUNC(NAME, pixel_t restrict out0, pixel_t restrict out1, \
91		pixel_t restrict out2, pixel_t restrict out3, \
92		__VA_ARGS__)
93
94		/* Helper macros to call into functions declared with DECL_FUNC_* */
95		#define CALL(FUNC, ...) \
96	0	fn(FUNC)(iter, impl, x, y, z, w, __VA_ARGS__)
97
98		#define CALL_READ(FUNC, ...) \
99	0	fn(FUNC)(iter, impl, (const pixel_t *) iter->in[0], \
100	0	(const pixel_t *) iter->in[1], \
101	0	(const pixel_t *) iter->in[2], \
102	0	(const pixel_t *) iter->in[3], __VA_ARGS__)
103
104		#define CALL_WRITE(FUNC, ...) \
105	0	CALL(FUNC, (pixel_t ) iter->out[0], (pixel_t ) iter->out[1], \
106	0	(pixel_t ) iter->out[2], (pixel_t ) iter->out[3], __VA_ARGS__)
107
108		/* Helper macros to declare continuation functions */
109		#define DECL_IMPL(NAME) \
110		static SWS_FUNC void fn(NAME)(SwsOpIter *restrict iter, \
111		const SwsOpImpl *restrict impl, \
112		block_t x, block_t y, \
113		block_t z, block_t w)
114
115		#define DECL_IMPL_READ(NAME) \
116		static SWS_FUNC void fn(NAME)(SwsOpIter *restrict iter, \
117		const SwsOpImpl *restrict impl)
118
119		/* Helper macro to call into the next continuation with a given type */
120		#define CONTINUE(TYPE, ...) \
121	0	((void ()(SwsOpIter , const SwsOpImpl *, \
122	0	TYPE x, TYPE y, TYPE z, TYPE w)) impl->cont) \
123	0	(iter, &impl[1], __VA_ARGS__)
124
125		/* Helper macros for common op setup code */
126		#define DECL_SETUP(NAME) \
127		static int fn(NAME)(const SwsOp op, SwsOpPriv out)
128
129	0	#define SETUP_MEMDUP(c) ff_setup_memdup(&(c), sizeof(c), out)
130		static inline int ff_setup_memdup(const void c, size_t size, SwsOpPriv out)
131	0	{
132	0	out->ptr = av_memdup(c, size);
133	0	return out->ptr ? 0 : AVERROR(ENOMEM);
134	0	} Unexecuted instantiation: ops_backend.c:ff_setup_memdup Unexecuted instantiation: ops_memcpy.c:ff_setup_memdup
135
136		/* Helper macro for declaring op table entries */
137		#define DECL_ENTRY(NAME, ...) \
138		static const SwsOpEntry fn(op_##NAME) = { \
139		.func = (SwsFuncPtr) fn(NAME), \
140		.type = PIXEL_TYPE, \
141		__VA_ARGS__ \
142		}
143
144		/* Helpers to define functions for common subsets of components */
145		#define DECL_PATTERN(NAME) \
146		DECL_FUNC(NAME, const bool X, const bool Y, const bool Z, const bool W)
147
148		#define WRAP_PATTERN(FUNC, X, Y, Z, W, ...) \
149		DECL_IMPL(FUNC##_##X##Y##Z##W) \
150	0	{ \
151	0	CALL(FUNC, X, Y, Z, W); \
152	0	} \ Unexecuted instantiation: ops_backend.c:expand16_1000_u8 Unexecuted instantiation: ops_backend.c:expand16_1001_u8 Unexecuted instantiation: ops_backend.c:expand16_1110_u8 Unexecuted instantiation: ops_backend.c:expand16_1111_u8 Unexecuted instantiation: ops_backend.c:expand32_1000_u8 Unexecuted instantiation: ops_backend.c:expand32_1001_u8 Unexecuted instantiation: ops_backend.c:expand32_1110_u8 Unexecuted instantiation: ops_backend.c:expand32_1111_u8 Unexecuted instantiation: ops_backend.c:min_1000_u8 Unexecuted instantiation: ops_backend.c:min_1001_u8 Unexecuted instantiation: ops_backend.c:min_1110_u8 Unexecuted instantiation: ops_backend.c:min_1111_u8 Unexecuted instantiation: ops_backend.c:max_1000_u8 Unexecuted instantiation: ops_backend.c:max_1001_u8 Unexecuted instantiation: ops_backend.c:max_1110_u8 Unexecuted instantiation: ops_backend.c:max_1111_u8 Unexecuted instantiation: ops_backend.c:scale_1000_u8 Unexecuted instantiation: ops_backend.c:scale_1001_u8 Unexecuted instantiation: ops_backend.c:scale_1110_u8 Unexecuted instantiation: ops_backend.c:scale_1111_u8 Unexecuted instantiation: ops_backend.c:convert_float_1000_u8 Unexecuted instantiation: ops_backend.c:convert_float_1001_u8 Unexecuted instantiation: ops_backend.c:convert_float_1110_u8 Unexecuted instantiation: ops_backend.c:convert_float_1111_u8 Unexecuted instantiation: ops_backend.c:convert_uint16_1000_u8 Unexecuted instantiation: ops_backend.c:convert_uint16_1001_u8 Unexecuted instantiation: ops_backend.c:convert_uint16_1110_u8 Unexecuted instantiation: ops_backend.c:convert_uint16_1111_u8 Unexecuted instantiation: ops_backend.c:convert_uint32_1000_u8 Unexecuted instantiation: ops_backend.c:convert_uint32_1001_u8 Unexecuted instantiation: ops_backend.c:convert_uint32_1110_u8 Unexecuted instantiation: ops_backend.c:convert_uint32_1111_u8 Unexecuted instantiation: ops_backend.c:swap_bytes_1000_u16 Unexecuted instantiation: ops_backend.c:swap_bytes_1001_u16 Unexecuted instantiation: ops_backend.c:swap_bytes_1110_u16 Unexecuted instantiation: ops_backend.c:swap_bytes_1111_u16 Unexecuted instantiation: ops_backend.c:min_1000_u16 Unexecuted instantiation: ops_backend.c:min_1001_u16 Unexecuted instantiation: ops_backend.c:min_1110_u16 Unexecuted instantiation: ops_backend.c:min_1111_u16 Unexecuted instantiation: ops_backend.c:max_1000_u16 Unexecuted instantiation: ops_backend.c:max_1001_u16 Unexecuted instantiation: ops_backend.c:max_1110_u16 Unexecuted instantiation: ops_backend.c:max_1111_u16 Unexecuted instantiation: ops_backend.c:scale_1000_u16 Unexecuted instantiation: ops_backend.c:scale_1001_u16 Unexecuted instantiation: ops_backend.c:scale_1110_u16 Unexecuted instantiation: ops_backend.c:scale_1111_u16 Unexecuted instantiation: ops_backend.c:convert_float_1000_u16 Unexecuted instantiation: ops_backend.c:convert_float_1001_u16 Unexecuted instantiation: ops_backend.c:convert_float_1110_u16 Unexecuted instantiation: ops_backend.c:convert_float_1111_u16 Unexecuted instantiation: ops_backend.c:lshift_1000_u16 Unexecuted instantiation: ops_backend.c:lshift_1001_u16 Unexecuted instantiation: ops_backend.c:lshift_1110_u16 Unexecuted instantiation: ops_backend.c:lshift_1111_u16 Unexecuted instantiation: ops_backend.c:rshift_1000_u16 Unexecuted instantiation: ops_backend.c:rshift_1001_u16 Unexecuted instantiation: ops_backend.c:rshift_1110_u16 Unexecuted instantiation: ops_backend.c:rshift_1111_u16 Unexecuted instantiation: ops_backend.c:convert_uint8_1000_u16 Unexecuted instantiation: ops_backend.c:convert_uint8_1001_u16 Unexecuted instantiation: ops_backend.c:convert_uint8_1110_u16 Unexecuted instantiation: ops_backend.c:convert_uint8_1111_u16 Unexecuted instantiation: ops_backend.c:convert_uint32_1000_u16 Unexecuted instantiation: ops_backend.c:convert_uint32_1001_u16 Unexecuted instantiation: ops_backend.c:convert_uint32_1110_u16 Unexecuted instantiation: ops_backend.c:convert_uint32_1111_u16 Unexecuted instantiation: ops_backend.c:swap_bytes_1000_u32 Unexecuted instantiation: ops_backend.c:swap_bytes_1001_u32 Unexecuted instantiation: ops_backend.c:swap_bytes_1110_u32 Unexecuted instantiation: ops_backend.c:swap_bytes_1111_u32 Unexecuted instantiation: ops_backend.c:min_1000_u32 Unexecuted instantiation: ops_backend.c:min_1001_u32 Unexecuted instantiation: ops_backend.c:min_1110_u32 Unexecuted instantiation: ops_backend.c:min_1111_u32 Unexecuted instantiation: ops_backend.c:max_1000_u32 Unexecuted instantiation: ops_backend.c:max_1001_u32 Unexecuted instantiation: ops_backend.c:max_1110_u32 Unexecuted instantiation: ops_backend.c:max_1111_u32 Unexecuted instantiation: ops_backend.c:scale_1000_u32 Unexecuted instantiation: ops_backend.c:scale_1001_u32 Unexecuted instantiation: ops_backend.c:scale_1110_u32 Unexecuted instantiation: ops_backend.c:scale_1111_u32 Unexecuted instantiation: ops_backend.c:convert_float_1000_u32 Unexecuted instantiation: ops_backend.c:convert_float_1001_u32 Unexecuted instantiation: ops_backend.c:convert_float_1110_u32 Unexecuted instantiation: ops_backend.c:convert_float_1111_u32 Unexecuted instantiation: ops_backend.c:lshift_1000_u32 Unexecuted instantiation: ops_backend.c:lshift_1001_u32 Unexecuted instantiation: ops_backend.c:lshift_1110_u32 Unexecuted instantiation: ops_backend.c:lshift_1111_u32 Unexecuted instantiation: ops_backend.c:rshift_1000_u32 Unexecuted instantiation: ops_backend.c:rshift_1001_u32 Unexecuted instantiation: ops_backend.c:rshift_1110_u32 Unexecuted instantiation: ops_backend.c:rshift_1111_u32 Unexecuted instantiation: ops_backend.c:convert_uint8_1000_u32 Unexecuted instantiation: ops_backend.c:convert_uint8_1001_u32 Unexecuted instantiation: ops_backend.c:convert_uint8_1110_u32 Unexecuted instantiation: ops_backend.c:convert_uint8_1111_u32 Unexecuted instantiation: ops_backend.c:convert_uint16_1000_u32 Unexecuted instantiation: ops_backend.c:convert_uint16_1001_u32 Unexecuted instantiation: ops_backend.c:convert_uint16_1110_u32 Unexecuted instantiation: ops_backend.c:convert_uint16_1111_u32 Unexecuted instantiation: ops_backend.c:convert_uint8_1000_f32 Unexecuted instantiation: ops_backend.c:convert_uint8_1001_f32 Unexecuted instantiation: ops_backend.c:convert_uint8_1110_f32 Unexecuted instantiation: ops_backend.c:convert_uint8_1111_f32 Unexecuted instantiation: ops_backend.c:convert_uint16_1000_f32 Unexecuted instantiation: ops_backend.c:convert_uint16_1001_f32 Unexecuted instantiation: ops_backend.c:convert_uint16_1110_f32 Unexecuted instantiation: ops_backend.c:convert_uint16_1111_f32 Unexecuted instantiation: ops_backend.c:convert_uint32_1000_f32 Unexecuted instantiation: ops_backend.c:convert_uint32_1001_f32 Unexecuted instantiation: ops_backend.c:convert_uint32_1110_f32 Unexecuted instantiation: ops_backend.c:convert_uint32_1111_f32 Unexecuted instantiation: ops_backend.c:min_1000_f32 Unexecuted instantiation: ops_backend.c:min_1001_f32 Unexecuted instantiation: ops_backend.c:min_1110_f32 Unexecuted instantiation: ops_backend.c:min_1111_f32 Unexecuted instantiation: ops_backend.c:max_1000_f32 Unexecuted instantiation: ops_backend.c:max_1001_f32 Unexecuted instantiation: ops_backend.c:max_1110_f32 Unexecuted instantiation: ops_backend.c:max_1111_f32 Unexecuted instantiation: ops_backend.c:scale_1000_f32 Unexecuted instantiation: ops_backend.c:scale_1001_f32 Unexecuted instantiation: ops_backend.c:scale_1110_f32 Unexecuted instantiation: ops_backend.c:scale_1111_f32 Unexecuted instantiation: ops_backend.c:convert_uint32_1000_u32 Unexecuted instantiation: ops_backend.c:convert_uint32_1001_u32 Unexecuted instantiation: ops_backend.c:convert_uint32_1110_u32 Unexecuted instantiation: ops_backend.c:convert_uint32_1111_u32
153		\
154		DECL_ENTRY(FUNC##_##X##Y##Z##W, \
155		.unused = { !X, !Y, !Z, !W }, \
156		__VA_ARGS__ \
157		)
158
159		#define WRAP_COMMON_PATTERNS(FUNC, ...) \
160		WRAP_PATTERN(FUNC, 1, 0, 0, 0, __VA_ARGS__); \
161		WRAP_PATTERN(FUNC, 1, 0, 0, 1, __VA_ARGS__); \
162		WRAP_PATTERN(FUNC, 1, 1, 1, 0, __VA_ARGS__); \
163		WRAP_PATTERN(FUNC, 1, 1, 1, 1, __VA_ARGS__)
164
165		#define REF_COMMON_PATTERNS(NAME) \
166		&fn(op_##NAME##_1000), \
167		&fn(op_##NAME##_1001), \
168		&fn(op_##NAME##_1110), \
169		&fn(op_##NAME##_1111)
170
171		#endif

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Created: 2026-01-25 07:18