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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
*/
#include "libavutil/avassert.h"
#include "ops_backend.h"
#ifndef BIT_DEPTH
# define BIT_DEPTH 32
#endif
#if BIT_DEPTH == 32
# define PIXEL_TYPE SWS_PIXEL_F32
# define PIXEL_MAX FLT_MAX
# define PIXEL_MIN FLT_MIN
# define pixel_t float
# define block_t f32block_t
# define px f32
#else
# error Invalid BIT_DEPTH
#endif
#define IS_FLOAT 1
#define FMT_CHAR f
#include "ops_tmpl_common.c"
DECL_SETUP(setup_dither)
{
const int size = 1 << op->dither.size_log2;
if (size == 1) {
/* We special case this value */
av_assert1(!av_cmp_q(op->dither.matrix[0], av_make_q(1, 2)));
out->ptr = NULL;
return 0;
}
const int width = FFMAX(size, SWS_BLOCK_SIZE);
pixel_t *matrix = out->ptr = av_malloc(sizeof(pixel_t) * size * width);
if (!matrix)
return AVERROR(ENOMEM);
static_assert(sizeof(out->ptr) <= sizeof(uint8_t[8]), ">8 byte pointers not supported");
int8_t *offset = &out->i8[8];
for (int i = 0; i < 4; i++)
offset[i] = op->dither.y_offset[i];
for (int y = 0; y < size; y++) {
for (int x = 0; x < size; x++)
matrix[y * width + x] = av_q2pixel(op->dither.matrix[y * size + x]);
for (int x = size; x < width; x++) /* pad to block size */
matrix[y * width + x] = matrix[y * width + (x % size)];
}
return 0;
}
DECL_FUNC(dither, const int size_log2)
{
const pixel_t *restrict matrix = impl->priv.ptr;
const int8_t *restrict offset = &impl->priv.i8[8];
const int mask = (1 << size_log2) - 1;
const int y_line = iter->y;
const int size = 1 << size_log2;
const int width = FFMAX(size, SWS_BLOCK_SIZE);
const int base = iter->x & ~(SWS_BLOCK_SIZE - 1) & (size - 1);
#define DITHER_COMP(VAR, IDX) \
if (offset[IDX] >= 0) { \
const int row = (y_line + offset[IDX]) & mask; \
SWS_LOOP \
for (int i = 0; i < SWS_BLOCK_SIZE; i++) \
VAR[i] += size_log2 ? matrix[row * width + base + i] : (pixel_t) 0.5; \
}
DITHER_COMP(x, 0)
DITHER_COMP(y, 1)
DITHER_COMP(z, 2)
DITHER_COMP(w, 3)
CONTINUE(block_t, x, y, z, w);
}
#define WRAP_DITHER(N) \
DECL_IMPL(dither##N) \
{ \
CALL(dither, N); \
} \
\
DECL_ENTRY(dither##N, \
.op = SWS_OP_DITHER, \
.dither_size = N, \
.setup = fn(setup_dither), \
.free = av_free, \
);
WRAP_DITHER(0)
WRAP_DITHER(1)
WRAP_DITHER(2)
WRAP_DITHER(3)
WRAP_DITHER(4)
WRAP_DITHER(5)
WRAP_DITHER(6)
WRAP_DITHER(7)
WRAP_DITHER(8)
typedef struct {
/* Stored in split form for convenience */
pixel_t m[4][4];
pixel_t k[4];
} fn(LinCoeffs);
DECL_SETUP(setup_linear)
{
fn(LinCoeffs) c;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++)
c.m[i][j] = av_q2pixel(op->lin.m[i][j]);
c.k[i] = av_q2pixel(op->lin.m[i][4]);
}
return SETUP_MEMDUP(c);
}
/**
* Fully general case for a 5x5 linear affine transformation. Should never be
* called without constant `mask`. This function will compile down to the
* appropriately optimized version for the required subset of operations when
* called with a constant mask.
*/
DECL_FUNC(linear_mask, const uint32_t mask)
{
const fn(LinCoeffs) c = *(const fn(LinCoeffs) *) impl->priv.ptr;
SWS_LOOP
for (int i = 0; i < SWS_BLOCK_SIZE; i++) {
const pixel_t xx = x[i];
const pixel_t yy = y[i];
const pixel_t zz = z[i];
const pixel_t ww = w[i];
x[i] = (mask & SWS_MASK_OFF(0)) ? c.k[0] : 0;
x[i] += (mask & SWS_MASK(0, 0)) ? c.m[0][0] * xx : xx;
x[i] += (mask & SWS_MASK(0, 1)) ? c.m[0][1] * yy : 0;
x[i] += (mask & SWS_MASK(0, 2)) ? c.m[0][2] * zz : 0;
x[i] += (mask & SWS_MASK(0, 3)) ? c.m[0][3] * ww : 0;
y[i] = (mask & SWS_MASK_OFF(1)) ? c.k[1] : 0;
y[i] += (mask & SWS_MASK(1, 0)) ? c.m[1][0] * xx : 0;
y[i] += (mask & SWS_MASK(1, 1)) ? c.m[1][1] * yy : yy;
y[i] += (mask & SWS_MASK(1, 2)) ? c.m[1][2] * zz : 0;
y[i] += (mask & SWS_MASK(1, 3)) ? c.m[1][3] * ww : 0;
z[i] = (mask & SWS_MASK_OFF(2)) ? c.k[2] : 0;
z[i] += (mask & SWS_MASK(2, 0)) ? c.m[2][0] * xx : 0;
z[i] += (mask & SWS_MASK(2, 1)) ? c.m[2][1] * yy : 0;
z[i] += (mask & SWS_MASK(2, 2)) ? c.m[2][2] * zz : zz;
z[i] += (mask & SWS_MASK(2, 3)) ? c.m[2][3] * ww : 0;
w[i] = (mask & SWS_MASK_OFF(3)) ? c.k[3] : 0;
w[i] += (mask & SWS_MASK(3, 0)) ? c.m[3][0] * xx : 0;
w[i] += (mask & SWS_MASK(3, 1)) ? c.m[3][1] * yy : 0;
w[i] += (mask & SWS_MASK(3, 2)) ? c.m[3][2] * zz : 0;
w[i] += (mask & SWS_MASK(3, 3)) ? c.m[3][3] * ww : ww;
}
CONTINUE(block_t, x, y, z, w);
}
#define WRAP_LINEAR(NAME, MASK) \
DECL_IMPL(linear_##NAME) \
{ \
CALL(linear_mask, MASK); \
} \
\
DECL_ENTRY(linear_##NAME, \
.op = SWS_OP_LINEAR, \
.setup = fn(setup_linear), \
.free = av_free, \
.linear_mask = (MASK), \
);
WRAP_LINEAR(luma, SWS_MASK_LUMA)
WRAP_LINEAR(alpha, SWS_MASK_ALPHA)
WRAP_LINEAR(lumalpha, SWS_MASK_LUMA | SWS_MASK_ALPHA)
WRAP_LINEAR(dot3, 0x7)
WRAP_LINEAR(row0, SWS_MASK_ROW(0))
WRAP_LINEAR(row0a, SWS_MASK_ROW(0) | SWS_MASK_ALPHA)
WRAP_LINEAR(diag3, SWS_MASK_DIAG3)
WRAP_LINEAR(diag4, SWS_MASK_DIAG4)
WRAP_LINEAR(diagoff3, SWS_MASK_DIAG3 | SWS_MASK_OFF3)
WRAP_LINEAR(matrix3, SWS_MASK_MAT3)
WRAP_LINEAR(affine3, SWS_MASK_MAT3 | SWS_MASK_OFF3)
WRAP_LINEAR(affine3a, SWS_MASK_MAT3 | SWS_MASK_OFF3 | SWS_MASK_ALPHA)
WRAP_LINEAR(matrix4, SWS_MASK_MAT4)
WRAP_LINEAR(affine4, SWS_MASK_MAT4 | SWS_MASK_OFF4)
static const SwsOpTable fn(op_table_float) = {
.block_size = SWS_BLOCK_SIZE,
.entries = {
REF_COMMON_PATTERNS(convert_uint8),
REF_COMMON_PATTERNS(convert_uint16),
REF_COMMON_PATTERNS(convert_uint32),
&fn(op_clear_1110),
REF_COMMON_PATTERNS(min),
REF_COMMON_PATTERNS(max),
REF_COMMON_PATTERNS(scale),
&fn(op_dither0),
&fn(op_dither1),
&fn(op_dither2),
&fn(op_dither3),
&fn(op_dither4),
&fn(op_dither5),
&fn(op_dither6),
&fn(op_dither7),
&fn(op_dither8),
&fn(op_clear_1110),
&fn(op_clear_0111),
&fn(op_clear_0011),
&fn(op_linear_luma),
&fn(op_linear_alpha),
&fn(op_linear_lumalpha),
&fn(op_linear_dot3),
&fn(op_linear_row0),
&fn(op_linear_row0a),
&fn(op_linear_diag3),
&fn(op_linear_diag4),
&fn(op_linear_diagoff3),
&fn(op_linear_matrix3),
&fn(op_linear_affine3),
&fn(op_linear_affine3a),
&fn(op_linear_matrix4),
&fn(op_linear_affine4),
NULL
},
};
#undef PIXEL_TYPE
#undef PIXEL_MAX
#undef PIXEL_MIN
#undef pixel_t
#undef block_t
#undef px
#undef FMT_CHAR
#undef IS_FLOAT
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