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/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
#include "mathops.h"
#include "huffyuvdsp.h"
// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
#define pb_7f (~0UL / 255 * 0x7f)
#define pb_80 (~0UL / 255 * 0x80)
static void add_bytes_c(uint8_t *dst, uint8_t *src, int w)
{
long i;
for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
long a = *(long *) (src + i);
long b = *(long *) (dst + i);
*(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
}
for (; i < w; i++)
dst[i + 0] += src[i + 0];
}
static void add_hfyu_median_pred_c(uint8_t *dst, const uint8_t *src1,
const uint8_t *diff, int w,
int *left, int *left_top)
{
int i;
uint8_t l, lt;
l = *left;
lt = *left_top;
for (i = 0; i < w; i++) {
l = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i];
lt = src1[i];
dst[i] = l;
}
*left = l;
*left_top = lt;
}
static int add_hfyu_left_pred_c(uint8_t *dst, const uint8_t *src, int w,
int acc)
{
int i;
for (i = 0; i < w - 1; i++) {
acc += src[i];
dst[i] = acc;
i++;
acc += src[i];
dst[i] = acc;
}
for (; i < w; i++) {
acc += src[i];
dst[i] = acc;
}
return acc;
}
#if HAVE_BIGENDIAN
#define B 3
#define G 2
#define R 1
#define A 0
#else
#define B 0
#define G 1
#define R 2
#define A 3
#endif
static void add_hfyu_left_pred_bgr32_c(uint8_t *dst, const uint8_t *src,
int w, int *red, int *green,
int *blue, int *alpha)
{
int i, r = *red, g = *green, b = *blue, a = *alpha;
for (i = 0; i < w; i++) {
b += src[4 * i + B];
g += src[4 * i + G];
r += src[4 * i + R];
a += src[4 * i + A];
dst[4 * i + B] = b;
dst[4 * i + G] = g;
dst[4 * i + R] = r;
dst[4 * i + A] = a;
}
*red = r;
*green = g;
*blue = b;
*alpha = a;
}
#undef B
#undef G
#undef R
#undef A
av_cold void ff_huffyuvdsp_init(HuffYUVDSPContext *c)
{
c->add_bytes = add_bytes_c;
c->add_hfyu_median_pred = add_hfyu_median_pred_c;
c->add_hfyu_left_pred = add_hfyu_left_pred_c;
c->add_hfyu_left_pred_bgr32 = add_hfyu_left_pred_bgr32_c;
if (ARCH_X86)
ff_huffyuvdsp_init_x86(c);
}
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