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media/libvpx/vp8/common/reconintra4x4.c@ac0c01689b40 (annotated)

media/libvpx/vp8/common/reconintra4x4.c

Thu, 15 Jan 2015 15:59:08 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 15 Jan 2015 15:59:08 +0100
branch
TOR_BUG_9701
changeset 10
ac0c01689b40
permissions
-rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0 1 /*
michael@0 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0 3 *
michael@0 4 * Use of this source code is governed by a BSD-style license
michael@0 5 * that can be found in the LICENSE file in the root of the source
michael@0 6 * tree. An additional intellectual property rights grant can be found
michael@0 7 * in the file PATENTS. All contributing project authors may
michael@0 8 * be found in the AUTHORS file in the root of the source tree.
michael@0 9 */
michael@0 10
michael@0 11
michael@0 12 #include "vpx_config.h"
michael@0 13 #include "vp8_rtcd.h"
michael@0 14 #include "blockd.h"
michael@0 15
michael@0 16 void vp8_intra4x4_predict_c(unsigned char *Above,
michael@0 17 unsigned char *yleft, int left_stride,
michael@0 18 int _b_mode,
michael@0 19 unsigned char *dst, int dst_stride,
michael@0 20 unsigned char top_left)
michael@0 21 {
michael@0 22 int i, r, c;
michael@0 23 B_PREDICTION_MODE b_mode = (B_PREDICTION_MODE)_b_mode;
michael@0 24 unsigned char Left[4];
michael@0 25 Left[0] = yleft[0];
michael@0 26 Left[1] = yleft[left_stride];
michael@0 27 Left[2] = yleft[2 * left_stride];
michael@0 28 Left[3] = yleft[3 * left_stride];
michael@0 29
michael@0 30 switch (b_mode)
michael@0 31 {
michael@0 32 case B_DC_PRED:
michael@0 33 {
michael@0 34 int expected_dc = 0;
michael@0 35
michael@0 36 for (i = 0; i < 4; i++)
michael@0 37 {
michael@0 38 expected_dc += Above[i];
michael@0 39 expected_dc += Left[i];
michael@0 40 }
michael@0 41
michael@0 42 expected_dc = (expected_dc + 4) >> 3;
michael@0 43
michael@0 44 for (r = 0; r < 4; r++)
michael@0 45 {
michael@0 46 for (c = 0; c < 4; c++)
michael@0 47 {
michael@0 48 dst[c] = expected_dc;
michael@0 49 }
michael@0 50
michael@0 51 dst += dst_stride;
michael@0 52 }
michael@0 53 }
michael@0 54 break;
michael@0 55 case B_TM_PRED:
michael@0 56 {
michael@0 57 /* prediction similar to true_motion prediction */
michael@0 58 for (r = 0; r < 4; r++)
michael@0 59 {
michael@0 60 for (c = 0; c < 4; c++)
michael@0 61 {
michael@0 62 int pred = Above[c] - top_left + Left[r];
michael@0 63
michael@0 64 if (pred < 0)
michael@0 65 pred = 0;
michael@0 66
michael@0 67 if (pred > 255)
michael@0 68 pred = 255;
michael@0 69
michael@0 70 dst[c] = pred;
michael@0 71 }
michael@0 72
michael@0 73 dst += dst_stride;
michael@0 74 }
michael@0 75 }
michael@0 76 break;
michael@0 77
michael@0 78 case B_VE_PRED:
michael@0 79 {
michael@0 80
michael@0 81 unsigned int ap[4];
michael@0 82 ap[0] = (top_left + 2 * Above[0] + Above[1] + 2) >> 2;
michael@0 83 ap[1] = (Above[0] + 2 * Above[1] + Above[2] + 2) >> 2;
michael@0 84 ap[2] = (Above[1] + 2 * Above[2] + Above[3] + 2) >> 2;
michael@0 85 ap[3] = (Above[2] + 2 * Above[3] + Above[4] + 2) >> 2;
michael@0 86
michael@0 87 for (r = 0; r < 4; r++)
michael@0 88 {
michael@0 89 for (c = 0; c < 4; c++)
michael@0 90 {
michael@0 91
michael@0 92 dst[c] = ap[c];
michael@0 93 }
michael@0 94
michael@0 95 dst += dst_stride;
michael@0 96 }
michael@0 97
michael@0 98 }
michael@0 99 break;
michael@0 100
michael@0 101
michael@0 102 case B_HE_PRED:
michael@0 103 {
michael@0 104
michael@0 105 unsigned int lp[4];
michael@0 106 lp[0] = (top_left + 2 * Left[0] + Left[1] + 2) >> 2;
michael@0 107 lp[1] = (Left[0] + 2 * Left[1] + Left[2] + 2) >> 2;
michael@0 108 lp[2] = (Left[1] + 2 * Left[2] + Left[3] + 2) >> 2;
michael@0 109 lp[3] = (Left[2] + 2 * Left[3] + Left[3] + 2) >> 2;
michael@0 110
michael@0 111 for (r = 0; r < 4; r++)
michael@0 112 {
michael@0 113 for (c = 0; c < 4; c++)
michael@0 114 {
michael@0 115 dst[c] = lp[r];
michael@0 116 }
michael@0 117
michael@0 118 dst += dst_stride;
michael@0 119 }
michael@0 120 }
michael@0 121 break;
michael@0 122 case B_LD_PRED:
michael@0 123 {
michael@0 124 unsigned char *ptr = Above;
michael@0 125 dst[0 * dst_stride + 0] = (ptr[0] + ptr[1] * 2 + ptr[2] + 2) >> 2;
michael@0 126 dst[0 * dst_stride + 1] =
michael@0 127 dst[1 * dst_stride + 0] = (ptr[1] + ptr[2] * 2 + ptr[3] + 2) >> 2;
michael@0 128 dst[0 * dst_stride + 2] =
michael@0 129 dst[1 * dst_stride + 1] =
michael@0 130 dst[2 * dst_stride + 0] = (ptr[2] + ptr[3] * 2 + ptr[4] + 2) >> 2;
michael@0 131 dst[0 * dst_stride + 3] =
michael@0 132 dst[1 * dst_stride + 2] =
michael@0 133 dst[2 * dst_stride + 1] =
michael@0 134 dst[3 * dst_stride + 0] = (ptr[3] + ptr[4] * 2 + ptr[5] + 2) >> 2;
michael@0 135 dst[1 * dst_stride + 3] =
michael@0 136 dst[2 * dst_stride + 2] =
michael@0 137 dst[3 * dst_stride + 1] = (ptr[4] + ptr[5] * 2 + ptr[6] + 2) >> 2;
michael@0 138 dst[2 * dst_stride + 3] =
michael@0 139 dst[3 * dst_stride + 2] = (ptr[5] + ptr[6] * 2 + ptr[7] + 2) >> 2;
michael@0 140 dst[3 * dst_stride + 3] = (ptr[6] + ptr[7] * 2 + ptr[7] + 2) >> 2;
michael@0 141
michael@0 142 }
michael@0 143 break;
michael@0 144 case B_RD_PRED:
michael@0 145 {
michael@0 146
michael@0 147 unsigned char pp[9];
michael@0 148
michael@0 149 pp[0] = Left[3];
michael@0 150 pp[1] = Left[2];
michael@0 151 pp[2] = Left[1];
michael@0 152 pp[3] = Left[0];
michael@0 153 pp[4] = top_left;
michael@0 154 pp[5] = Above[0];
michael@0 155 pp[6] = Above[1];
michael@0 156 pp[7] = Above[2];
michael@0 157 pp[8] = Above[3];
michael@0 158
michael@0 159 dst[3 * dst_stride + 0] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
michael@0 160 dst[3 * dst_stride + 1] =
michael@0 161 dst[2 * dst_stride + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
michael@0 162 dst[3 * dst_stride + 2] =
michael@0 163 dst[2 * dst_stride + 1] =
michael@0 164 dst[1 * dst_stride + 0] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
michael@0 165 dst[3 * dst_stride + 3] =
michael@0 166 dst[2 * dst_stride + 2] =
michael@0 167 dst[1 * dst_stride + 1] =
michael@0 168 dst[0 * dst_stride + 0] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
michael@0 169 dst[2 * dst_stride + 3] =
michael@0 170 dst[1 * dst_stride + 2] =
michael@0 171 dst[0 * dst_stride + 1] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
michael@0 172 dst[1 * dst_stride + 3] =
michael@0 173 dst[0 * dst_stride + 2] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
michael@0 174 dst[0 * dst_stride + 3] = (pp[6] + pp[7] * 2 + pp[8] + 2) >> 2;
michael@0 175
michael@0 176 }
michael@0 177 break;
michael@0 178 case B_VR_PRED:
michael@0 179 {
michael@0 180
michael@0 181 unsigned char pp[9];
michael@0 182
michael@0 183 pp[0] = Left[3];
michael@0 184 pp[1] = Left[2];
michael@0 185 pp[2] = Left[1];
michael@0 186 pp[3] = Left[0];
michael@0 187 pp[4] = top_left;
michael@0 188 pp[5] = Above[0];
michael@0 189 pp[6] = Above[1];
michael@0 190 pp[7] = Above[2];
michael@0 191 pp[8] = Above[3];
michael@0 192
michael@0 193
michael@0 194 dst[3 * dst_stride + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
michael@0 195 dst[2 * dst_stride + 0] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
michael@0 196 dst[3 * dst_stride + 1] =
michael@0 197 dst[1 * dst_stride + 0] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
michael@0 198 dst[2 * dst_stride + 1] =
michael@0 199 dst[0 * dst_stride + 0] = (pp[4] + pp[5] + 1) >> 1;
michael@0 200 dst[3 * dst_stride + 2] =
michael@0 201 dst[1 * dst_stride + 1] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
michael@0 202 dst[2 * dst_stride + 2] =
michael@0 203 dst[0 * dst_stride + 1] = (pp[5] + pp[6] + 1) >> 1;
michael@0 204 dst[3 * dst_stride + 3] =
michael@0 205 dst[1 * dst_stride + 2] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
michael@0 206 dst[2 * dst_stride + 3] =
michael@0 207 dst[0 * dst_stride + 2] = (pp[6] + pp[7] + 1) >> 1;
michael@0 208 dst[1 * dst_stride + 3] = (pp[6] + pp[7] * 2 + pp[8] + 2) >> 2;
michael@0 209 dst[0 * dst_stride + 3] = (pp[7] + pp[8] + 1) >> 1;
michael@0 210
michael@0 211 }
michael@0 212 break;
michael@0 213 case B_VL_PRED:
michael@0 214 {
michael@0 215
michael@0 216 unsigned char *pp = Above;
michael@0 217
michael@0 218 dst[0 * dst_stride + 0] = (pp[0] + pp[1] + 1) >> 1;
michael@0 219 dst[1 * dst_stride + 0] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
michael@0 220 dst[2 * dst_stride + 0] =
michael@0 221 dst[0 * dst_stride + 1] = (pp[1] + pp[2] + 1) >> 1;
michael@0 222 dst[1 * dst_stride + 1] =
michael@0 223 dst[3 * dst_stride + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
michael@0 224 dst[2 * dst_stride + 1] =
michael@0 225 dst[0 * dst_stride + 2] = (pp[2] + pp[3] + 1) >> 1;
michael@0 226 dst[3 * dst_stride + 1] =
michael@0 227 dst[1 * dst_stride + 2] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
michael@0 228 dst[0 * dst_stride + 3] =
michael@0 229 dst[2 * dst_stride + 2] = (pp[3] + pp[4] + 1) >> 1;
michael@0 230 dst[1 * dst_stride + 3] =
michael@0 231 dst[3 * dst_stride + 2] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
michael@0 232 dst[2 * dst_stride + 3] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
michael@0 233 dst[3 * dst_stride + 3] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
michael@0 234 }
michael@0 235 break;
michael@0 236
michael@0 237 case B_HD_PRED:
michael@0 238 {
michael@0 239 unsigned char pp[9];
michael@0 240 pp[0] = Left[3];
michael@0 241 pp[1] = Left[2];
michael@0 242 pp[2] = Left[1];
michael@0 243 pp[3] = Left[0];
michael@0 244 pp[4] = top_left;
michael@0 245 pp[5] = Above[0];
michael@0 246 pp[6] = Above[1];
michael@0 247 pp[7] = Above[2];
michael@0 248 pp[8] = Above[3];
michael@0 249
michael@0 250
michael@0 251 dst[3 * dst_stride + 0] = (pp[0] + pp[1] + 1) >> 1;
michael@0 252 dst[3 * dst_stride + 1] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
michael@0 253 dst[2 * dst_stride + 0] =
michael@0 254 dst[3 * dst_stride + 2] = (pp[1] + pp[2] + 1) >> 1;
michael@0 255 dst[2 * dst_stride + 1] =
michael@0 256 dst[3 * dst_stride + 3] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
michael@0 257 dst[2 * dst_stride + 2] =
michael@0 258 dst[1 * dst_stride + 0] = (pp[2] + pp[3] + 1) >> 1;
michael@0 259 dst[2 * dst_stride + 3] =
michael@0 260 dst[1 * dst_stride + 1] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
michael@0 261 dst[1 * dst_stride + 2] =
michael@0 262 dst[0 * dst_stride + 0] = (pp[3] + pp[4] + 1) >> 1;
michael@0 263 dst[1 * dst_stride + 3] =
michael@0 264 dst[0 * dst_stride + 1] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
michael@0 265 dst[0 * dst_stride + 2] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
michael@0 266 dst[0 * dst_stride + 3] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
michael@0 267 }
michael@0 268 break;
michael@0 269
michael@0 270
michael@0 271 case B_HU_PRED:
michael@0 272 {
michael@0 273 unsigned char *pp = Left;
michael@0 274 dst[0 * dst_stride + 0] = (pp[0] + pp[1] + 1) >> 1;
michael@0 275 dst[0 * dst_stride + 1] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
michael@0 276 dst[0 * dst_stride + 2] =
michael@0 277 dst[1 * dst_stride + 0] = (pp[1] + pp[2] + 1) >> 1;
michael@0 278 dst[0 * dst_stride + 3] =
michael@0 279 dst[1 * dst_stride + 1] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
michael@0 280 dst[1 * dst_stride + 2] =
michael@0 281 dst[2 * dst_stride + 0] = (pp[2] + pp[3] + 1) >> 1;
michael@0 282 dst[1 * dst_stride + 3] =
michael@0 283 dst[2 * dst_stride + 1] = (pp[2] + pp[3] * 2 + pp[3] + 2) >> 2;
michael@0 284 dst[2 * dst_stride + 2] =
michael@0 285 dst[2 * dst_stride + 3] =
michael@0 286 dst[3 * dst_stride + 0] =
michael@0 287 dst[3 * dst_stride + 1] =
michael@0 288 dst[3 * dst_stride + 2] =
michael@0 289 dst[3 * dst_stride + 3] = pp[3];
michael@0 290 }
michael@0 291 break;
michael@0 292
michael@0 293 default:
michael@0 294 break;
michael@0 295
michael@0 296 }
michael@0 297 }

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