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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include "./av1_rtcd.h"
#include "./cdef.h"
#include "aom/aom_image.h"
#include "aom_dsp/aom_dsp_common.h"
static int clpf_sample(int X, int A, int B, int C, int D, int E, int F, int G,
int H, int s, unsigned int dmp) {
int delta = 1 * constrain(A - X, s, dmp) + 3 * constrain(B - X, s, dmp) +
1 * constrain(C - X, s, dmp) + 3 * constrain(D - X, s, dmp) +
3 * constrain(E - X, s, dmp) + 1 * constrain(F - X, s, dmp) +
3 * constrain(G - X, s, dmp) + 1 * constrain(H - X, s, dmp);
return (8 + delta - (delta < 0)) >> 4;
}
static int clpf_hsample(int X, int A, int B, int C, int D, int s,
unsigned int dmp) {
int delta = 1 * constrain(A - X, s, dmp) + 3 * constrain(B - X, s, dmp) +
3 * constrain(C - X, s, dmp) + 1 * constrain(D - X, s, dmp);
return (4 + delta - (delta < 0)) >> 3;
}
void aom_clpf_block_c(uint8_t *dst, const uint16_t *src, int dstride,
int sstride, int sizex, int sizey, unsigned int strength,
unsigned int damping) {
int x, y;
for (y = 0; y < sizey; y++) {
for (x = 0; x < sizex; x++) {
const int X = src[y * sstride + x];
const int A = src[(y - 2) * sstride + x];
const int B = src[(y - 1) * sstride + x];
const int C = src[y * sstride + x - 2];
const int D = src[y * sstride + x - 1];
const int E = src[y * sstride + x + 1];
const int F = src[y * sstride + x + 2];
const int G = src[(y + 1) * sstride + x];
const int H = src[(y + 2) * sstride + x];
const int delta =
clpf_sample(X, A, B, C, D, E, F, G, H, strength, damping);
dst[y * dstride + x] = X + delta;
}
}
}
// Identical to aom_clpf_block_c() apart from "dst".
void aom_clpf_block_hbd_c(uint16_t *dst, const uint16_t *src, int dstride,
int sstride, int sizex, int sizey,
unsigned int strength, unsigned int damping) {
int x, y;
for (y = 0; y < sizey; y++) {
for (x = 0; x < sizex; x++) {
const int X = src[y * sstride + x];
const int A = src[(y - 2) * sstride + x];
const int B = src[(y - 1) * sstride + x];
const int C = src[y * sstride + x - 2];
const int D = src[y * sstride + x - 1];
const int E = src[y * sstride + x + 1];
const int F = src[y * sstride + x + 2];
const int G = src[(y + 1) * sstride + x];
const int H = src[(y + 2) * sstride + x];
const int delta =
clpf_sample(X, A, B, C, D, E, F, G, H, strength, damping);
dst[y * dstride + x] = X + delta;
}
}
}
// Vertically restricted filter
void aom_clpf_hblock_c(uint8_t *dst, const uint16_t *src, int dstride,
int sstride, int sizex, int sizey, unsigned int strength,
unsigned int damping) {
int x, y;
for (y = 0; y < sizey; y++) {
for (x = 0; x < sizex; x++) {
const int X = src[y * sstride + x];
const int A = src[y * sstride + x - 2];
const int B = src[y * sstride + x - 1];
const int C = src[y * sstride + x + 1];
const int D = src[y * sstride + x + 2];
const int delta = clpf_hsample(X, A, B, C, D, strength, damping);
dst[y * dstride + x] = X + delta;
}
}
}
void aom_clpf_hblock_hbd_c(uint16_t *dst, const uint16_t *src, int dstride,
int sstride, int sizex, int sizey,
unsigned int strength, unsigned int damping) {
int x, y;
for (y = 0; y < sizey; y++) {
for (x = 0; x < sizex; x++) {
const int X = src[y * sstride + x];
const int A = src[y * sstride + x - 2];
const int B = src[y * sstride + x - 1];
const int C = src[y * sstride + x + 1];
const int D = src[y * sstride + x + 2];
const int delta = clpf_hsample(X, A, B, C, D, strength, damping);
dst[y * dstride + x] = X + delta;
}
}
}
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