ref: 859ae6aade4832761073231d50052c6c8fc0656f
dir: /src/ipred_prepare.h/
/*
* 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.
*/
#ifndef __DAV1D_SRC_IPRED_PREPARE_H__
#define __DAV1D_SRC_IPRED_PREPARE_H__
#include <stddef.h>
#include <stdint.h>
#include "common/bitdepth.h"
#include "src/env.h"
#include "src/intra_edge.h"
#include "src/levels.h"
/*
* Luma intra edge preparation.
*
* x/y/start/w/h are in luma block (4px) units:
* - x and y are the absolute block positions in the image;
* - start/w/h are the *dependent tile* boundary positions. In practice, start
* is the horizontal tile start, w is the horizontal tile end, the vertical
* tile start is assumed to be 0 and h is the vertical image end.
*
* edge_flags signals which edges are available for this transform-block inside
* the given partition, as well as for the partition inside the superblock
* structure.
*
* dst and stride are pointers to the top/left position of the current block,
* and can be used to locate the top, left, top/left, top/right and bottom/left
* edge pointers also.
*
* angle is the angle_delta [-3..3] on input, and the absolute angle on output.
*
* mode is the intra prediction mode as coded in the bitstream. The return value
* is this same mode, converted to an index in the DSP functions.
*
* tw/th are the size of the transform block in block (4px) units.
*
* topleft_out is a pointer to scratch memory that will be filled with the edge
* pixels. The memory array should have space to be indexed in the [-2*w,2*w]
* range, in the following order:
* - [0] will be the top/left edge pixel;
* - [1..w] will be the top edge pixels (1 being left-most, w being right-most);
* - [w+1..w*w] will be the top/right edge pixels;
* - [-1..-w] will be the left edge pixels (-1 being top-most, -w being bottom-
* most);
* - [-w-1..-2*w] will be the bottom/left edge pixels.
* Each edge may remain uninitialized if it is not used by the returned mode
* index. If edges are not available (because the edge position is outside the
* tile dimensions or because edge_flags indicates lack of edge availability),
* they will be extended from nearby edges as defined by the av1 spec.
*/
enum IntraPredMode
bytefn(dav1d_prepare_intra_edges)(int x, int have_left, int y, int have_top,
int w, int h, enum EdgeFlags edge_flags,
const pixel *dst, ptrdiff_t stride,
const pixel *prefilter_toplevel_sb_edge,
enum IntraPredMode mode, int *angle,
int tw, int th, pixel *topleft_out);
// is or'ed with the angle argument into intra predictors to signal that edges
// are smooth and should use reduced filter strength
#define ANGLE_SMOOTH_EDGE_FLAG 512
static inline int sm_flag(const BlockContext *const b, const int idx) {
if (!b->intra[idx]) return 0;
const enum IntraPredMode m = b->mode[idx];
return (m == SMOOTH_PRED || m == SMOOTH_H_PRED ||
m == SMOOTH_V_PRED) ? ANGLE_SMOOTH_EDGE_FLAG : 0;
}
static inline int sm_uv_flag(const BlockContext *const b, const int idx) {
const enum IntraPredMode m = b->uvmode[idx];
return (m == SMOOTH_PRED || m == SMOOTH_H_PRED ||
m == SMOOTH_V_PRED) ? ANGLE_SMOOTH_EDGE_FLAG : 0;
}
#endif /* __DAV1D_SRC_IPRED_PREPARE_H__ */