ref: e071d257cae01c07d2204478dcc489200df66750
dir: /src/cdef_tmpl.c/
/*
* Copyright © 2018, VideoLAN and dav1d authors
* Copyright © 2018, Two Orioles, LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <assert.h>
#include <stdlib.h>
#include "common/intops.h"
#include "src/cdef.h"
static inline int constrain(const int diff, const int threshold,
const int damping)
{
if (!threshold) return 0;
const int shift = imax(0, damping - ulog2(threshold));
return apply_sign(imin(abs(diff), imax(0, threshold - (abs(diff) >> shift))),
diff);
}
static inline void fill(uint16_t *tmp, const ptrdiff_t stride,
const int w, const int h)
{
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++)
tmp[x] = INT16_MAX;
tmp += stride;
}
}
static void padding(uint16_t *tmp, const ptrdiff_t tmp_stride,
const pixel *src, const ptrdiff_t src_stride,
const pixel (*left)[2], pixel *const top[2],
const int w, const int h,
const enum CdefEdgeFlags edges)
{
// fill extended input buffer
int x_start = -2, x_end = w + 2, y_start = -2, y_end = h + 2;
if (!(edges & HAVE_TOP)) {
fill(tmp - 2 - 2 * tmp_stride, tmp_stride, w + 4, 2);
y_start = 0;
}
if (!(edges & HAVE_BOTTOM)) {
fill(tmp + h * tmp_stride - 2, tmp_stride, w + 4, 2);
y_end -= 2;
}
if (!(edges & HAVE_LEFT)) {
fill(tmp + y_start * tmp_stride - 2, tmp_stride, 2, y_end - y_start);
x_start = 0;
}
if (!(edges & HAVE_RIGHT)) {
fill(tmp + y_start * tmp_stride + w, tmp_stride, 2, y_end - y_start);
x_end -= 2;
}
for (int y = y_start; y < 0; y++)
for (int x = x_start; x < x_end; x++)
tmp[x + y * tmp_stride] = top[y & 1][x];
for (int y = 0; y < h; y++)
for (int x = x_start; x < 0; x++)
tmp[x + y * tmp_stride] = left[y][2 + x];
for (int y = 0; y < y_end; y++) {
for (int x = (y < h) ? 0 : x_start; x < x_end; x++)
tmp[x] = src[x];
src += PXSTRIDE(src_stride);
tmp += tmp_stride;
}
}
static NOINLINE void
cdef_filter_block_c(pixel *dst, const ptrdiff_t dst_stride,
const pixel (*left)[2], /*const*/ pixel *const top[2],
const int w, const int h, const int pri_strength,
const int sec_strength, const int dir,
const int damping, const enum CdefEdgeFlags edges)
{
static const int8_t cdef_directions[8 /* dir */][2 /* pass */] = {
{ -1 * 12 + 1, -2 * 12 + 2 },
{ 0 * 12 + 1, -1 * 12 + 2 },
{ 0 * 12 + 1, 0 * 12 + 2 },
{ 0 * 12 + 1, 1 * 12 + 2 },
{ 1 * 12 + 1, 2 * 12 + 2 },
{ 1 * 12 + 0, 2 * 12 + 1 },
{ 1 * 12 + 0, 2 * 12 + 0 },
{ 1 * 12 + 0, 2 * 12 - 1 }
};
static const uint8_t cdef_pri_taps[2][2] = { { 4, 2 }, { 3, 3 } };
static const uint8_t sec_taps[2] = { 2, 1 };
const ptrdiff_t tmp_stride = 12;
assert((w == 4 || w == 8) && (h == 4 || h == 8));
uint16_t tmp_buf[144]; // 12*12 is the maximum value of tmp_stride * (h + 4)
uint16_t *tmp = tmp_buf + 2 * tmp_stride + 2;
const uint8_t *const pri_taps = cdef_pri_taps[(pri_strength >> (BITDEPTH - 8)) & 1];
padding(tmp, tmp_stride, dst, dst_stride, left, top, w, h, edges);
// run actual filter
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
int sum = 0;
const int px = dst[x];
int max = px, min = px;
for (int k = 0; k < 2; k++) {
const int off1 = cdef_directions[dir][k];
const int p0 = tmp[x + off1];
const int p1 = tmp[x - off1];
sum += pri_taps[k] * constrain(p0 - px, pri_strength, damping);
sum += pri_taps[k] * constrain(p1 - px, pri_strength, damping);
if (p0 != INT16_MAX) max = imax(p0, max);
if (p1 != INT16_MAX) max = imax(p1, max);
min = imin(p0, min);
min = imin(p1, min);
const int off2 = cdef_directions[(dir + 2) & 7][k];
const int s0 = tmp[x + off2];
const int s1 = tmp[x - off2];
const int off3 = cdef_directions[(dir + 6) & 7][k];
const int s2 = tmp[x + off3];
const int s3 = tmp[x - off3];
if (s0 != INT16_MAX) max = imax(s0, max);
if (s1 != INT16_MAX) max = imax(s1, max);
if (s2 != INT16_MAX) max = imax(s2, max);
if (s3 != INT16_MAX) max = imax(s3, max);
min = imin(s0, min);
min = imin(s1, min);
min = imin(s2, min);
min = imin(s3, min);
sum += sec_taps[k] * constrain(s0 - px, sec_strength, damping);
sum += sec_taps[k] * constrain(s1 - px, sec_strength, damping);
sum += sec_taps[k] * constrain(s2 - px, sec_strength, damping);
sum += sec_taps[k] * constrain(s3 - px, sec_strength, damping);
}
dst[x] = iclip(px + ((8 + sum - (sum < 0)) >> 4), min, max);
}
dst += PXSTRIDE(dst_stride);
tmp += tmp_stride;
}
}
#define cdef_fn(w, h) \
static void cdef_filter_block_##w##x##h##_c(pixel *const dst, \
const ptrdiff_t stride, \
const pixel (*left)[2], \
/*const*/ pixel *const top[2], \
const int pri_strength, \
const int sec_strength, \
const int dir, \
const int damping, \
const enum CdefEdgeFlags edges) \
{ \
cdef_filter_block_c(dst, stride, left, top, w, h, pri_strength, sec_strength, \
dir, damping, edges); \
}
cdef_fn(4, 4);
cdef_fn(4, 8);
cdef_fn(8, 8);
static int cdef_find_dir_c(const pixel *img, const ptrdiff_t stride,
unsigned *const var)
{
int partial_sum_hv[2][8] = { { 0 } };
int partial_sum_diag[2][15] = { { 0 } };
int partial_sum_alt[4][11] = { { 0 } };
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 8; x++) {
const int px = (img[x] >> (BITDEPTH - 8)) - 128;
partial_sum_diag[0][ y + x ] += px;
partial_sum_alt [0][ y + (x >> 1)] += px;
partial_sum_hv [0][ y ] += px;
partial_sum_alt [1][3 + y - (x >> 1)] += px;
partial_sum_diag[1][7 + y - x ] += px;
partial_sum_alt [2][3 - (y >> 1) + x ] += px;
partial_sum_hv [1][ x ] += px;
partial_sum_alt [3][ (y >> 1) + x ] += px;
}
img += PXSTRIDE(stride);
}
unsigned cost[8] = { 0 };
for (int n = 0; n < 8; n++) {
cost[2] += partial_sum_hv[0][n] * partial_sum_hv[0][n];
cost[6] += partial_sum_hv[1][n] * partial_sum_hv[1][n];
}
cost[2] *= 105;
cost[6] *= 105;
static const uint16_t div_table[7] = { 840, 420, 280, 210, 168, 140, 120 };
for (int n = 0; n < 7; n++) {
const int d = div_table[n];
cost[0] += (partial_sum_diag[0][n] * partial_sum_diag[0][n] +
partial_sum_diag[0][14 - n] * partial_sum_diag[0][14 - n]) * d;
cost[4] += (partial_sum_diag[1][n] * partial_sum_diag[1][n] +
partial_sum_diag[1][14 - n] * partial_sum_diag[1][14 - n]) * d;
}
cost[0] += partial_sum_diag[0][7] * partial_sum_diag[0][7] * 105;
cost[4] += partial_sum_diag[1][7] * partial_sum_diag[1][7] * 105;
for (int n = 0; n < 4; n++) {
unsigned *const cost_ptr = &cost[n * 2 + 1];
for (int m = 0; m < 5; m++)
*cost_ptr += partial_sum_alt[n][3 + m] * partial_sum_alt[n][3 + m];
*cost_ptr *= 105;
for (int m = 0; m < 3; m++) {
const int d = div_table[2 * m + 1];
*cost_ptr += (partial_sum_alt[n][m] * partial_sum_alt[n][m] +
partial_sum_alt[n][10 - m] * partial_sum_alt[n][10 - m]) * d;
}
}
int best_dir = 0;
unsigned best_cost = cost[0];
for (int n = 1; n < 8; n++) {
if (cost[n] > best_cost) {
best_cost = cost[n];
best_dir = n;
}
}
*var = (best_cost - (cost[best_dir ^ 4])) >> 10;
return best_dir;
}
void bitfn(dav1d_cdef_dsp_init)(Dav1dCdefDSPContext *const c) {
c->dir = cdef_find_dir_c;
c->fb[0] = cdef_filter_block_8x8_c;
c->fb[1] = cdef_filter_block_4x8_c;
c->fb[2] = cdef_filter_block_4x4_c;
#if HAVE_ASM && ARCH_X86 && BITDEPTH == 8
bitfn(dav1d_cdef_dsp_init_x86)(c);
#endif
}