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media/libvpx/vpx/src/vpx_image.c@ac0c01689b40 (annotated)

media/libvpx/vpx/src/vpx_image.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 <stdlib.h>
michael@0 13 #include <string.h>
michael@0 14 #include "vpx/vpx_image.h"
michael@0 15
michael@0 16 #define ADDRESS_STORAGE_SIZE sizeof(size_t)
michael@0 17 /*returns an addr aligned to the byte boundary specified by align*/
michael@0 18 #define align_addr(addr,align) (void*)(((size_t)(addr) + ((align) - 1)) & (size_t)-(align))
michael@0 19
michael@0 20 /* Memalign code is copied from vpx_mem.c */
michael@0 21 static void *img_buf_memalign(size_t align, size_t size) {
michael@0 22 void *addr,
michael@0 23 * x = NULL;
michael@0 24
michael@0 25 addr = malloc(size + align - 1 + ADDRESS_STORAGE_SIZE);
michael@0 26
michael@0 27 if (addr) {
michael@0 28 x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, (int)align);
michael@0 29 /* save the actual malloc address */
michael@0 30 ((size_t *)x)[-1] = (size_t)addr;
michael@0 31 }
michael@0 32
michael@0 33 return x;
michael@0 34 }
michael@0 35
michael@0 36 static void img_buf_free(void *memblk) {
michael@0 37 if (memblk) {
michael@0 38 void *addr = (void *)(((size_t *)memblk)[-1]);
michael@0 39 free(addr);
michael@0 40 }
michael@0 41 }
michael@0 42
michael@0 43 static vpx_image_t *img_alloc_helper(vpx_image_t *img,
michael@0 44 vpx_img_fmt_t fmt,
michael@0 45 unsigned int d_w,
michael@0 46 unsigned int d_h,
michael@0 47 unsigned int buf_align,
michael@0 48 unsigned int stride_align,
michael@0 49 unsigned char *img_data) {
michael@0 50
michael@0 51 unsigned int h, w, s, xcs, ycs, bps;
michael@0 52 int align;
michael@0 53
michael@0 54 /* Treat align==0 like align==1 */
michael@0 55 if (!buf_align)
michael@0 56 buf_align = 1;
michael@0 57
michael@0 58 /* Validate alignment (must be power of 2) */
michael@0 59 if (buf_align & (buf_align - 1))
michael@0 60 goto fail;
michael@0 61
michael@0 62 /* Treat align==0 like align==1 */
michael@0 63 if (!stride_align)
michael@0 64 stride_align = 1;
michael@0 65
michael@0 66 /* Validate alignment (must be power of 2) */
michael@0 67 if (stride_align & (stride_align - 1))
michael@0 68 goto fail;
michael@0 69
michael@0 70 /* Get sample size for this format */
michael@0 71 switch (fmt) {
michael@0 72 case VPX_IMG_FMT_RGB32:
michael@0 73 case VPX_IMG_FMT_RGB32_LE:
michael@0 74 case VPX_IMG_FMT_ARGB:
michael@0 75 case VPX_IMG_FMT_ARGB_LE:
michael@0 76 bps = 32;
michael@0 77 break;
michael@0 78 case VPX_IMG_FMT_RGB24:
michael@0 79 case VPX_IMG_FMT_BGR24:
michael@0 80 bps = 24;
michael@0 81 break;
michael@0 82 case VPX_IMG_FMT_RGB565:
michael@0 83 case VPX_IMG_FMT_RGB565_LE:
michael@0 84 case VPX_IMG_FMT_RGB555:
michael@0 85 case VPX_IMG_FMT_RGB555_LE:
michael@0 86 case VPX_IMG_FMT_UYVY:
michael@0 87 case VPX_IMG_FMT_YUY2:
michael@0 88 case VPX_IMG_FMT_YVYU:
michael@0 89 bps = 16;
michael@0 90 break;
michael@0 91 case VPX_IMG_FMT_I420:
michael@0 92 case VPX_IMG_FMT_YV12:
michael@0 93 case VPX_IMG_FMT_VPXI420:
michael@0 94 case VPX_IMG_FMT_VPXYV12:
michael@0 95 bps = 12;
michael@0 96 break;
michael@0 97 default:
michael@0 98 bps = 16;
michael@0 99 break;
michael@0 100 }
michael@0 101
michael@0 102 /* Get chroma shift values for this format */
michael@0 103 switch (fmt) {
michael@0 104 case VPX_IMG_FMT_I420:
michael@0 105 case VPX_IMG_FMT_YV12:
michael@0 106 case VPX_IMG_FMT_VPXI420:
michael@0 107 case VPX_IMG_FMT_VPXYV12:
michael@0 108 xcs = 1;
michael@0 109 break;
michael@0 110 default:
michael@0 111 xcs = 0;
michael@0 112 break;
michael@0 113 }
michael@0 114
michael@0 115 switch (fmt) {
michael@0 116 case VPX_IMG_FMT_I420:
michael@0 117 case VPX_IMG_FMT_YV12:
michael@0 118 case VPX_IMG_FMT_VPXI420:
michael@0 119 case VPX_IMG_FMT_VPXYV12:
michael@0 120 ycs = 1;
michael@0 121 break;
michael@0 122 default:
michael@0 123 ycs = 0;
michael@0 124 break;
michael@0 125 }
michael@0 126
michael@0 127 /* Calculate storage sizes given the chroma subsampling */
michael@0 128 align = (1 << xcs) - 1;
michael@0 129 w = (d_w + align) & ~align;
michael@0 130 align = (1 << ycs) - 1;
michael@0 131 h = (d_h + align) & ~align;
michael@0 132 s = (fmt & VPX_IMG_FMT_PLANAR) ? w : bps * w / 8;
michael@0 133 s = (s + stride_align - 1) & ~(stride_align - 1);
michael@0 134
michael@0 135 /* Allocate the new image */
michael@0 136 if (!img) {
michael@0 137 img = (vpx_image_t *)calloc(1, sizeof(vpx_image_t));
michael@0 138
michael@0 139 if (!img)
michael@0 140 goto fail;
michael@0 141
michael@0 142 img->self_allocd = 1;
michael@0 143 } else {
michael@0 144 memset(img, 0, sizeof(vpx_image_t));
michael@0 145 }
michael@0 146
michael@0 147 img->img_data = img_data;
michael@0 148
michael@0 149 if (!img_data) {
michael@0 150 img->img_data = img_buf_memalign(buf_align, ((fmt & VPX_IMG_FMT_PLANAR) ?
michael@0 151 h * s * bps / 8 : h * s));
michael@0 152 img->img_data_owner = 1;
michael@0 153 }
michael@0 154
michael@0 155 if (!img->img_data)
michael@0 156 goto fail;
michael@0 157
michael@0 158 img->fmt = fmt;
michael@0 159 img->w = w;
michael@0 160 img->h = h;
michael@0 161 img->x_chroma_shift = xcs;
michael@0 162 img->y_chroma_shift = ycs;
michael@0 163 img->bps = bps;
michael@0 164
michael@0 165 /* Calculate strides */
michael@0 166 img->stride[VPX_PLANE_Y] = img->stride[VPX_PLANE_ALPHA] = s;
michael@0 167 img->stride[VPX_PLANE_U] = img->stride[VPX_PLANE_V] = s >> xcs;
michael@0 168
michael@0 169 /* Default viewport to entire image */
michael@0 170 if (!vpx_img_set_rect(img, 0, 0, d_w, d_h))
michael@0 171 return img;
michael@0 172
michael@0 173 fail:
michael@0 174 vpx_img_free(img);
michael@0 175 return NULL;
michael@0 176 }
michael@0 177
michael@0 178 vpx_image_t *vpx_img_alloc(vpx_image_t *img,
michael@0 179 vpx_img_fmt_t fmt,
michael@0 180 unsigned int d_w,
michael@0 181 unsigned int d_h,
michael@0 182 unsigned int align) {
michael@0 183 return img_alloc_helper(img, fmt, d_w, d_h, align, align, NULL);
michael@0 184 }
michael@0 185
michael@0 186 vpx_image_t *vpx_img_wrap(vpx_image_t *img,
michael@0 187 vpx_img_fmt_t fmt,
michael@0 188 unsigned int d_w,
michael@0 189 unsigned int d_h,
michael@0 190 unsigned int stride_align,
michael@0 191 unsigned char *img_data) {
michael@0 192 /* By setting buf_align = 1, we don't change buffer alignment in this
michael@0 193 * function. */
michael@0 194 return img_alloc_helper(img, fmt, d_w, d_h, 1, stride_align, img_data);
michael@0 195 }
michael@0 196
michael@0 197 int vpx_img_set_rect(vpx_image_t *img,
michael@0 198 unsigned int x,
michael@0 199 unsigned int y,
michael@0 200 unsigned int w,
michael@0 201 unsigned int h) {
michael@0 202 unsigned char *data;
michael@0 203
michael@0 204 if (x + w <= img->w && y + h <= img->h) {
michael@0 205 img->d_w = w;
michael@0 206 img->d_h = h;
michael@0 207
michael@0 208 /* Calculate plane pointers */
michael@0 209 if (!(img->fmt & VPX_IMG_FMT_PLANAR)) {
michael@0 210 img->planes[VPX_PLANE_PACKED] =
michael@0 211 img->img_data + x * img->bps / 8 + y * img->stride[VPX_PLANE_PACKED];
michael@0 212 } else {
michael@0 213 data = img->img_data;
michael@0 214
michael@0 215 if (img->fmt & VPX_IMG_FMT_HAS_ALPHA) {
michael@0 216 img->planes[VPX_PLANE_ALPHA] =
michael@0 217 data + x + y * img->stride[VPX_PLANE_ALPHA];
michael@0 218 data += img->h * img->stride[VPX_PLANE_ALPHA];
michael@0 219 }
michael@0 220
michael@0 221 img->planes[VPX_PLANE_Y] = data + x + y * img->stride[VPX_PLANE_Y];
michael@0 222 data += img->h * img->stride[VPX_PLANE_Y];
michael@0 223
michael@0 224 if (!(img->fmt & VPX_IMG_FMT_UV_FLIP)) {
michael@0 225 img->planes[VPX_PLANE_U] = data
michael@0 226 + (x >> img->x_chroma_shift)
michael@0 227 + (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
michael@0 228 data += (img->h >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
michael@0 229 img->planes[VPX_PLANE_V] = data
michael@0 230 + (x >> img->x_chroma_shift)
michael@0 231 + (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
michael@0 232 } else {
michael@0 233 img->planes[VPX_PLANE_V] = data
michael@0 234 + (x >> img->x_chroma_shift)
michael@0 235 + (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
michael@0 236 data += (img->h >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
michael@0 237 img->planes[VPX_PLANE_U] = data
michael@0 238 + (x >> img->x_chroma_shift)
michael@0 239 + (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
michael@0 240 }
michael@0 241 }
michael@0 242
michael@0 243 return 0;
michael@0 244 }
michael@0 245
michael@0 246 return -1;
michael@0 247 }
michael@0 248
michael@0 249 void vpx_img_flip(vpx_image_t *img) {
michael@0 250 /* Note: In the calculation pointer adjustment calculation, we want the
michael@0 251 * rhs to be promoted to a signed type. Section 6.3.1.8 of the ISO C99
michael@0 252 * standard indicates that if the adjustment parameter is unsigned, the
michael@0 253 * stride parameter will be promoted to unsigned, causing errors when
michael@0 254 * the lhs is a larger type than the rhs.
michael@0 255 */
michael@0 256 img->planes[VPX_PLANE_Y] += (signed)(img->d_h - 1) * img->stride[VPX_PLANE_Y];
michael@0 257 img->stride[VPX_PLANE_Y] = -img->stride[VPX_PLANE_Y];
michael@0 258
michael@0 259 img->planes[VPX_PLANE_U] += (signed)((img->d_h >> img->y_chroma_shift) - 1)
michael@0 260 * img->stride[VPX_PLANE_U];
michael@0 261 img->stride[VPX_PLANE_U] = -img->stride[VPX_PLANE_U];
michael@0 262
michael@0 263 img->planes[VPX_PLANE_V] += (signed)((img->d_h >> img->y_chroma_shift) - 1)
michael@0 264 * img->stride[VPX_PLANE_V];
michael@0 265 img->stride[VPX_PLANE_V] = -img->stride[VPX_PLANE_V];
michael@0 266
michael@0 267 img->planes[VPX_PLANE_ALPHA] += (signed)(img->d_h - 1) * img->stride[VPX_PLANE_ALPHA];
michael@0 268 img->stride[VPX_PLANE_ALPHA] = -img->stride[VPX_PLANE_ALPHA];
michael@0 269 }
michael@0 270
michael@0 271 void vpx_img_free(vpx_image_t *img) {
michael@0 272 if (img) {
michael@0 273 if (img->img_data && img->img_data_owner)
michael@0 274 img_buf_free(img->img_data);
michael@0 275
michael@0 276 if (img->self_allocd)
michael@0 277 free(img);
michael@0 278 }
michael@0 279 }

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