ref: a32c50862831c9f74ad38acf5764dac30a15a718
dir: /src/ipred_prepare.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 <stdint.h>
#include <string.h>
#include "common/intops.h"
#include "src/ipred_prepare.h"
static const uint8_t av1_mode_conv[N_INTRA_PRED_MODES]
[2 /* have_left */][2 /* have_top */] =
{
[DC_PRED] = { { DC_128_PRED, TOP_DC_PRED },
{ LEFT_DC_PRED, DC_PRED } },
[PAETH_PRED] = { { DC_128_PRED, VERT_PRED },
{ HOR_PRED, PAETH_PRED } },
};
static const uint8_t av1_mode_to_angle_map[8] = {
90, 180, 45, 135, 113, 157, 203, 67
};
static const struct {
uint8_t needs_left:1;
uint8_t needs_top:1;
uint8_t needs_topleft:1;
uint8_t needs_topright:1;
uint8_t needs_bottomleft:1;
} av1_intra_prediction_edges[N_IMPL_INTRA_PRED_MODES] = {
[DC_PRED] = { .needs_top = 1, .needs_left = 1 },
[VERT_PRED] = { .needs_top = 1 },
[HOR_PRED] = { .needs_left = 1 },
[LEFT_DC_PRED] = { .needs_left = 1 },
[TOP_DC_PRED] = { .needs_top = 1 },
[DC_128_PRED] = { 0 },
[Z1_PRED] = { .needs_top = 1, .needs_topright = 1,
.needs_topleft = 1 },
[Z2_PRED] = { .needs_left = 1, .needs_top = 1, .needs_topleft = 1 },
[Z3_PRED] = { .needs_left = 1, .needs_bottomleft = 1,
.needs_topleft = 1 },
[SMOOTH_PRED] = { .needs_left = 1, .needs_top = 1 },
[SMOOTH_V_PRED] = { .needs_left = 1, .needs_top = 1 },
[SMOOTH_H_PRED] = { .needs_left = 1, .needs_top = 1 },
[PAETH_PRED] = { .needs_left = 1, .needs_top = 1, .needs_topleft = 1 },
[FILTER_PRED] = { .needs_left = 1, .needs_top = 1, .needs_topleft = 1 },
};
enum IntraPredMode
bytefn(dav1d_prepare_intra_edges)(const int x, const int have_left,
const int y, const int have_top,
const int w, const int h,
const enum EdgeFlags edge_flags,
const pixel *const dst,
const ptrdiff_t stride,
const pixel *prefilter_toplevel_sb_edge,
enum IntraPredMode mode, int *const angle,
const int tw, const int th,
pixel *const topleft_out)
{
assert(y < h && x < w);
switch (mode) {
case VERT_PRED:
case HOR_PRED:
case DIAG_DOWN_LEFT_PRED:
case DIAG_DOWN_RIGHT_PRED:
case VERT_RIGHT_PRED:
case HOR_DOWN_PRED:
case HOR_UP_PRED:
case VERT_LEFT_PRED: {
*angle = av1_mode_to_angle_map[mode - VERT_PRED] + 3 * *angle;
if (*angle < 90) {
mode = have_top ? Z1_PRED : VERT_PRED;
} else if (*angle == 90) {
mode = VERT_PRED;
} else if (*angle < 180) {
mode = Z2_PRED;
} else if (*angle == 180) {
mode = HOR_PRED;
} else {
mode = have_left ? Z3_PRED : HOR_PRED;
}
break;
}
case DC_PRED:
case PAETH_PRED:
mode = av1_mode_conv[mode][have_left][have_top];
break;
default:
break;
}
const pixel *dst_top;
if (have_top &&
(av1_intra_prediction_edges[mode].needs_top ||
av1_intra_prediction_edges[mode].needs_topleft ||
(av1_intra_prediction_edges[mode].needs_left && !have_left)))
{
if (prefilter_toplevel_sb_edge) {
dst_top = &prefilter_toplevel_sb_edge[x * 4];
} else {
dst_top = &dst[-PXSTRIDE(stride)];
}
}
if (av1_intra_prediction_edges[mode].needs_left) {
const int sz = th << 2;
pixel *const left = &topleft_out[-sz];
if (have_left) {
const int px_have = imin(sz, (h - y) << 2);
for (int i = 0; i < px_have; i++)
left[sz - 1 - i] = dst[PXSTRIDE(stride) * i - 1];
if (px_have < sz)
pixel_set(left, left[sz - px_have], sz - px_have);
} else {
pixel_set(left, have_top ? *dst_top : ((1 << BITDEPTH) >> 1) + 1, sz);
}
if (av1_intra_prediction_edges[mode].needs_bottomleft) {
const int have_bottomleft = (!have_left || y + th >= h) ? 0 :
(edge_flags & EDGE_I444_LEFT_HAS_BOTTOM);
if (have_bottomleft) {
const int px_have = imin(sz, (h - y - th) << 2);
for (int i = 0; i < px_have; i++)
left[-(i + 1)] = dst[(sz + i) * PXSTRIDE(stride) - 1];
if (px_have < sz)
pixel_set(left - sz, left[-px_have], sz - px_have);
} else {
pixel_set(left - sz, left[0], sz);
}
}
}
if (av1_intra_prediction_edges[mode].needs_top) {
const int sz = tw << 2;
pixel *const top = &topleft_out[1];
if (have_top) {
const int px_have = imin(sz, (w - x) << 2);
pixel_copy(top, dst_top, px_have);
if (px_have < sz)
pixel_set(top + px_have, top[px_have - 1], sz - px_have);
} else {
pixel_set(top, have_left ? dst[-1] : ((1 << BITDEPTH) >> 1) - 1, sz);
}
if (av1_intra_prediction_edges[mode].needs_topright) {
const int have_topright = (!have_top || x + tw >= w) ? 0 :
(edge_flags & EDGE_I444_TOP_HAS_RIGHT);
if (have_topright) {
const int px_have = imin(sz, (w - x - tw) << 2);
pixel_copy(top + sz, &dst_top[sz], px_have);
if (px_have < sz)
pixel_set(top + sz + px_have, top[sz + px_have - 1],
sz - px_have);
} else {
pixel_set(top + sz, top[sz - 1], sz);
}
}
}
if (av1_intra_prediction_edges[mode].needs_topleft) {
if (have_left) {
*topleft_out = have_top ? dst_top[-1] : dst[-1];
} else {
*topleft_out = have_top ? *dst_top : (1 << BITDEPTH) >> 1;
}
if (mode == Z2_PRED && tw + th >= 6)
*topleft_out = (topleft_out[-1] * 5 + topleft_out[0] * 6 +
topleft_out[1] * 5 + 8) >> 4;
}
return mode;
}