ipred_prepare.h (4988B)
1 /* 2 * Copyright © 2018, VideoLAN and dav1d authors 3 * Copyright © 2018, Two Orioles, LLC 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright notice, this 10 * list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef DAV1D_SRC_IPRED_PREPARE_H 29 #define DAV1D_SRC_IPRED_PREPARE_H 30 31 #include <stddef.h> 32 #include <stdint.h> 33 34 #include "common/bitdepth.h" 35 36 #include "src/env.h" 37 #include "src/intra_edge.h" 38 #include "src/levels.h" 39 40 /* 41 * Luma intra edge preparation. 42 * 43 * x/y/start/w/h are in luma block (4px) units: 44 * - x and y are the absolute block positions in the image; 45 * - start/w/h are the *dependent tile* boundary positions. In practice, start 46 * is the horizontal tile start, w is the horizontal tile end, the vertical 47 * tile start is assumed to be 0 and h is the vertical image end. 48 * 49 * edge_flags signals which edges are available for this transform-block inside 50 * the given partition, as well as for the partition inside the superblock 51 * structure. 52 * 53 * dst and stride are pointers to the top/left position of the current block, 54 * and can be used to locate the top, left, top/left, top/right and bottom/left 55 * edge pointers also. 56 * 57 * angle is the angle_delta [-3..3] on input, and the absolute angle on output. 58 * 59 * mode is the intra prediction mode as coded in the bitstream. The return value 60 * is this same mode, converted to an index in the DSP functions. 61 * 62 * tw/th are the size of the transform block in block (4px) units. 63 * 64 * topleft_out is a pointer to scratch memory that will be filled with the edge 65 * pixels. The memory array should have space to be indexed in the [-2*w,2*w] 66 * range, in the following order: 67 * - [0] will be the top/left edge pixel; 68 * - [1..w] will be the top edge pixels (1 being left-most, w being right-most); 69 * - [w+1..2*w] will be the top/right edge pixels; 70 * - [-1..-w] will be the left edge pixels (-1 being top-most, -w being bottom- 71 * most); 72 * - [-w-1..-2*w] will be the bottom/left edge pixels. 73 * Each edge may remain uninitialized if it is not used by the returned mode 74 * index. If edges are not available (because the edge position is outside the 75 * tile dimensions or because edge_flags indicates lack of edge availability), 76 * they will be extended from nearby edges as defined by the av1 spec. 77 */ 78 enum IntraPredMode 79 bytefn(dav1d_prepare_intra_edges)(int x, int have_left, int y, int have_top, 80 int w, int h, enum EdgeFlags edge_flags, 81 const pixel *dst, ptrdiff_t stride, 82 const pixel *prefilter_toplevel_sb_edge, 83 enum IntraPredMode mode, int *angle, 84 int tw, int th, int filter_edge, 85 pixel *topleft_out HIGHBD_DECL_SUFFIX); 86 87 // These flags are OR'd with the angle argument into intra predictors. 88 // ANGLE_USE_EDGE_FILTER_FLAG signals that edges should be convolved 89 // with a filter before using them to predict values in a block. 90 // ANGLE_SMOOTH_EDGE_FLAG means that edges are smooth and should use 91 // reduced filter strength. 92 #define ANGLE_USE_EDGE_FILTER_FLAG 1024 93 #define ANGLE_SMOOTH_EDGE_FLAG 512 94 95 static inline int sm_flag(const BlockContext *const b, const int idx) { 96 if (!b->intra[idx]) return 0; 97 const enum IntraPredMode m = b->mode[idx]; 98 return (m == SMOOTH_PRED || m == SMOOTH_H_PRED || 99 m == SMOOTH_V_PRED) ? ANGLE_SMOOTH_EDGE_FLAG : 0; 100 } 101 102 static inline int sm_uv_flag(const BlockContext *const b, const int idx) { 103 const enum IntraPredMode m = b->uvmode[idx]; 104 return (m == SMOOTH_PRED || m == SMOOTH_H_PRED || 105 m == SMOOTH_V_PRED) ? ANGLE_SMOOTH_EDGE_FLAG : 0; 106 } 107 108 #endif /* DAV1D_SRC_IPRED_PREPARE_H */