1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include <stdlib.h> 12 #include <string.h> 13 14 #include "vpx/vpx_image.h" 15 #include "vpx/vpx_integer.h" 16 #include "vpx_mem/vpx_mem.h" 17 18 static vpx_image_t *img_alloc_helper(vpx_image_t *img, vpx_img_fmt_t fmt, 19 unsigned int d_w, unsigned int d_h, 20 unsigned int buf_align, 21 unsigned int stride_align, 22 unsigned char *img_data) { 23 unsigned int h, w, s, xcs, ycs, bps; 24 unsigned int stride_in_bytes; 25 int align; 26 27 /* Treat align==0 like align==1 */ 28 if (!buf_align) buf_align = 1; 29 30 /* Validate alignment (must be power of 2) */ 31 if (buf_align & (buf_align - 1)) goto fail; 32 33 /* Treat align==0 like align==1 */ 34 if (!stride_align) stride_align = 1; 35 36 /* Validate alignment (must be power of 2) */ 37 if (stride_align & (stride_align - 1)) goto fail; 38 39 /* Get sample size for this format */ 40 switch (fmt) { 41 case VPX_IMG_FMT_RGB32: 42 case VPX_IMG_FMT_RGB32_LE: 43 case VPX_IMG_FMT_ARGB: 44 case VPX_IMG_FMT_ARGB_LE: bps = 32; break; 45 case VPX_IMG_FMT_RGB24: 46 case VPX_IMG_FMT_BGR24: bps = 24; break; 47 case VPX_IMG_FMT_RGB565: 48 case VPX_IMG_FMT_RGB565_LE: 49 case VPX_IMG_FMT_RGB555: 50 case VPX_IMG_FMT_RGB555_LE: 51 case VPX_IMG_FMT_UYVY: 52 case VPX_IMG_FMT_YUY2: 53 case VPX_IMG_FMT_YVYU: bps = 16; break; 54 case VPX_IMG_FMT_I420: 55 case VPX_IMG_FMT_YV12: 56 case VPX_IMG_FMT_VPXI420: 57 case VPX_IMG_FMT_VPXYV12: bps = 12; break; 58 case VPX_IMG_FMT_I422: 59 case VPX_IMG_FMT_I440: bps = 16; break; 60 case VPX_IMG_FMT_I444: bps = 24; break; 61 case VPX_IMG_FMT_I42016: bps = 24; break; 62 case VPX_IMG_FMT_I42216: 63 case VPX_IMG_FMT_I44016: bps = 32; break; 64 case VPX_IMG_FMT_I44416: bps = 48; break; 65 default: bps = 16; break; 66 } 67 68 /* Get chroma shift values for this format */ 69 switch (fmt) { 70 case VPX_IMG_FMT_I420: 71 case VPX_IMG_FMT_YV12: 72 case VPX_IMG_FMT_VPXI420: 73 case VPX_IMG_FMT_VPXYV12: 74 case VPX_IMG_FMT_I422: 75 case VPX_IMG_FMT_I42016: 76 case VPX_IMG_FMT_I42216: xcs = 1; break; 77 default: xcs = 0; break; 78 } 79 80 switch (fmt) { 81 case VPX_IMG_FMT_I420: 82 case VPX_IMG_FMT_I440: 83 case VPX_IMG_FMT_YV12: 84 case VPX_IMG_FMT_VPXI420: 85 case VPX_IMG_FMT_VPXYV12: 86 case VPX_IMG_FMT_I42016: 87 case VPX_IMG_FMT_I44016: ycs = 1; break; 88 default: ycs = 0; break; 89 } 90 91 /* Calculate storage sizes given the chroma subsampling */ 92 align = (1 << xcs) - 1; 93 w = (d_w + align) & ~align; 94 align = (1 << ycs) - 1; 95 h = (d_h + align) & ~align; 96 s = (fmt & VPX_IMG_FMT_PLANAR) ? w : bps * w / 8; 97 s = (s + stride_align - 1) & ~(stride_align - 1); 98 stride_in_bytes = (fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? s * 2 : s; 99 100 /* Allocate the new image */ 101 if (!img) { 102 img = (vpx_image_t *)calloc(1, sizeof(vpx_image_t)); 103 104 if (!img) goto fail; 105 106 img->self_allocd = 1; 107 } else { 108 memset(img, 0, sizeof(vpx_image_t)); 109 } 110 111 img->img_data = img_data; 112 113 if (!img_data) { 114 const uint64_t alloc_size = (fmt & VPX_IMG_FMT_PLANAR) 115 ? (uint64_t)h * s * bps / 8 116 : (uint64_t)h * s; 117 118 if (alloc_size != (size_t)alloc_size) goto fail; 119 120 img->img_data = (uint8_t *)vpx_memalign(buf_align, (size_t)alloc_size); 121 img->img_data_owner = 1; 122 } 123 124 if (!img->img_data) goto fail; 125 126 img->fmt = fmt; 127 img->bit_depth = (fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 16 : 8; 128 img->w = w; 129 img->h = h; 130 img->x_chroma_shift = xcs; 131 img->y_chroma_shift = ycs; 132 img->bps = bps; 133 134 /* Calculate strides */ 135 img->stride[VPX_PLANE_Y] = img->stride[VPX_PLANE_ALPHA] = stride_in_bytes; 136 img->stride[VPX_PLANE_U] = img->stride[VPX_PLANE_V] = stride_in_bytes >> xcs; 137 138 /* Default viewport to entire image */ 139 if (!vpx_img_set_rect(img, 0, 0, d_w, d_h)) return img; 140 141 fail: 142 vpx_img_free(img); 143 return NULL; 144 } 145 146 vpx_image_t *vpx_img_alloc(vpx_image_t *img, vpx_img_fmt_t fmt, 147 unsigned int d_w, unsigned int d_h, 148 unsigned int align) { 149 return img_alloc_helper(img, fmt, d_w, d_h, align, align, NULL); 150 } 151 152 vpx_image_t *vpx_img_wrap(vpx_image_t *img, vpx_img_fmt_t fmt, unsigned int d_w, 153 unsigned int d_h, unsigned int stride_align, 154 unsigned char *img_data) { 155 /* By setting buf_align = 1, we don't change buffer alignment in this 156 * function. */ 157 return img_alloc_helper(img, fmt, d_w, d_h, 1, stride_align, img_data); 158 } 159 160 int vpx_img_set_rect(vpx_image_t *img, unsigned int x, unsigned int y, 161 unsigned int w, unsigned int h) { 162 unsigned char *data; 163 164 if (x + w <= img->w && y + h <= img->h) { 165 img->d_w = w; 166 img->d_h = h; 167 168 /* Calculate plane pointers */ 169 if (!(img->fmt & VPX_IMG_FMT_PLANAR)) { 170 img->planes[VPX_PLANE_PACKED] = 171 img->img_data + x * img->bps / 8 + y * img->stride[VPX_PLANE_PACKED]; 172 } else { 173 const int bytes_per_sample = 174 (img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 2 : 1; 175 data = img->img_data; 176 177 if (img->fmt & VPX_IMG_FMT_HAS_ALPHA) { 178 img->planes[VPX_PLANE_ALPHA] = 179 data + x * bytes_per_sample + y * img->stride[VPX_PLANE_ALPHA]; 180 data += img->h * img->stride[VPX_PLANE_ALPHA]; 181 } 182 183 img->planes[VPX_PLANE_Y] = 184 data + x * bytes_per_sample + y * img->stride[VPX_PLANE_Y]; 185 data += img->h * img->stride[VPX_PLANE_Y]; 186 187 if (!(img->fmt & VPX_IMG_FMT_UV_FLIP)) { 188 img->planes[VPX_PLANE_U] = 189 data + (x >> img->x_chroma_shift) * bytes_per_sample + 190 (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U]; 191 data += (img->h >> img->y_chroma_shift) * img->stride[VPX_PLANE_U]; 192 img->planes[VPX_PLANE_V] = 193 data + (x >> img->x_chroma_shift) * bytes_per_sample + 194 (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_V]; 195 } else { 196 img->planes[VPX_PLANE_V] = 197 data + (x >> img->x_chroma_shift) * bytes_per_sample + 198 (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_V]; 199 data += (img->h >> img->y_chroma_shift) * img->stride[VPX_PLANE_V]; 200 img->planes[VPX_PLANE_U] = 201 data + (x >> img->x_chroma_shift) * bytes_per_sample + 202 (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U]; 203 } 204 } 205 return 0; 206 } 207 return -1; 208 } 209 210 void vpx_img_flip(vpx_image_t *img) { 211 /* Note: In the calculation pointer adjustment calculation, we want the 212 * rhs to be promoted to a signed type. Section 6.3.1.8 of the ISO C99 213 * standard indicates that if the adjustment parameter is unsigned, the 214 * stride parameter will be promoted to unsigned, causing errors when 215 * the lhs is a larger type than the rhs. 216 */ 217 img->planes[VPX_PLANE_Y] += (signed)(img->d_h - 1) * img->stride[VPX_PLANE_Y]; 218 img->stride[VPX_PLANE_Y] = -img->stride[VPX_PLANE_Y]; 219 220 img->planes[VPX_PLANE_U] += (signed)((img->d_h >> img->y_chroma_shift) - 1) * 221 img->stride[VPX_PLANE_U]; 222 img->stride[VPX_PLANE_U] = -img->stride[VPX_PLANE_U]; 223 224 img->planes[VPX_PLANE_V] += (signed)((img->d_h >> img->y_chroma_shift) - 1) * 225 img->stride[VPX_PLANE_V]; 226 img->stride[VPX_PLANE_V] = -img->stride[VPX_PLANE_V]; 227 228 img->planes[VPX_PLANE_ALPHA] += 229 (signed)(img->d_h - 1) * img->stride[VPX_PLANE_ALPHA]; 230 img->stride[VPX_PLANE_ALPHA] = -img->stride[VPX_PLANE_ALPHA]; 231 } 232 233 void vpx_img_free(vpx_image_t *img) { 234 if (img) { 235 if (img->img_data && img->img_data_owner) vpx_free(img->img_data); 236 237 if (img->self_allocd) free(img); 238 } 239 } 240
