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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"
typedef struct MemcpyPriv {
int num_planes;
int index[4]; /* or -1 to clear plane */
uint8_t clear_value[4];
} MemcpyPriv;
/* Memcpy backend for trivial cases */
static void process(const SwsOpExec *exec, const void *priv,
int x_start, int y_start, int x_end, int y_end)
{
const MemcpyPriv *p = priv;
const int lines = y_end - y_start;
av_assert1(x_start == 0 && x_end == exec->width);
for (int i = 0; i < p->num_planes; i++) {
uint8_t *out = exec->out[i];
const int idx = p->index[i];
if (idx < 0) {
memset(out, p->clear_value[i], exec->out_stride[i] * lines);
} else if (exec->out_stride[i] == exec->in_stride[idx]) {
memcpy(out, exec->in[idx], exec->out_stride[i] * lines);
} else {
const int bytes = x_end * exec->block_size_out;
const uint8_t *in = exec->in[idx];
for (int y = y_start; y < y_end; y++) {
memcpy(out, in, bytes);
out += exec->out_stride[i];
in += exec->in_stride[idx];
}
}
}
}
static int compile(SwsContext *ctx, SwsOpList *ops, SwsCompiledOp *out)
{
MemcpyPriv p = {0};
for (int n = 0; n < ops->num_ops; n++) {
const SwsOp *op = &ops->ops[n];
switch (op->op) {
case SWS_OP_READ:
if ((op->rw.packed && op->rw.elems != 1) || op->rw.frac)
return AVERROR(ENOTSUP);
for (int i = 0; i < op->rw.elems; i++)
p.index[i] = i;
break;
case SWS_OP_SWIZZLE: {
const MemcpyPriv orig = p;
for (int i = 0; i < 4; i++) {
/* Explicitly exclude swizzle masks that contain duplicates,
* because these are wasteful to implement as a memcpy */
for (int j = 0; j < i; j++) {
if (op->swizzle.in[i] == op->swizzle.in[j])
return AVERROR(ENOTSUP);
}
p.index[i] = orig.index[op->swizzle.in[i]];
}
break;
}
case SWS_OP_CLEAR:
for (int i = 0; i < 4; i++) {
if (!op->c.q4[i].den)
continue;
if (op->c.q4[i].den != 1)
return AVERROR(ENOTSUP);
/* Ensure all bytes to be cleared are the same, because we
* can't memset on multi-byte sequences */
uint8_t val = op->c.q4[i].num & 0xFF;
uint32_t ref = val;
switch (ff_sws_pixel_type_size(op->type)) {
case 2: ref *= 0x101; break;
case 4: ref *= 0x1010101; break;
}
if (ref != op->c.q4[i].num)
return AVERROR(ENOTSUP);
p.clear_value[i] = val;
p.index[i] = -1;
}
break;
case SWS_OP_WRITE:
if ((op->rw.packed && op->rw.elems != 1) || op->rw.frac)
return AVERROR(ENOTSUP);
p.num_planes = op->rw.elems;
break;
default:
return AVERROR(ENOTSUP);
}
}
*out = (SwsCompiledOp) {
.block_size = 1,
.func = process,
.priv = av_memdup(&p, sizeof(p)),
.free = av_free,
};
return out->priv ? 0 : AVERROR(ENOMEM);
}
const SwsOpBackend backend_murder = {
.name = "memcpy",
.compile = compile,
};
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