1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "vpx/vpx_image.h"
#include "vpx/vpx_integer.h"
#include "vpx_mem/vpx_mem.h"
static vpx_image_t *img_alloc_helper(vpx_image_t *img, vpx_img_fmt_t fmt,
unsigned int d_w, unsigned int d_h,
unsigned int buf_align,
unsigned int stride_align,
unsigned char *img_data) {
unsigned int h, w, s, xcs, ycs, bps;
unsigned int stride_in_bytes;
unsigned int align;
if (img != NULL) memset(img, 0, sizeof(vpx_image_t));
/* Treat align==0 like align==1 */
if (!buf_align) buf_align = 1;
/* Validate alignment (must be power of 2) */
if (buf_align & (buf_align - 1)) goto fail;
/* Treat align==0 like align==1 */
if (!stride_align) stride_align = 1;
/* Validate alignment (must be power of 2) */
if (stride_align & (stride_align - 1)) goto fail;
/* Get sample size for this format */
switch (fmt) {
case VPX_IMG_FMT_I420:
case VPX_IMG_FMT_YV12:
case VPX_IMG_FMT_NV12: bps = 12; break;
case VPX_IMG_FMT_I422:
case VPX_IMG_FMT_I440: bps = 16; break;
case VPX_IMG_FMT_I444: bps = 24; break;
case VPX_IMG_FMT_I42016: bps = 24; break;
case VPX_IMG_FMT_I42216:
case VPX_IMG_FMT_I44016: bps = 32; break;
case VPX_IMG_FMT_I44416: bps = 48; break;
default: bps = 16; break;
}
/* Get chroma shift values for this format */
// For VPX_IMG_FMT_NV12, xcs needs to be 0 such that UV data is all read at
// one time.
switch (fmt) {
case VPX_IMG_FMT_I420:
case VPX_IMG_FMT_YV12:
case VPX_IMG_FMT_I422:
case VPX_IMG_FMT_I42016:
case VPX_IMG_FMT_I42216: xcs = 1; break;
default: xcs = 0; break;
}
switch (fmt) {
case VPX_IMG_FMT_I420:
case VPX_IMG_FMT_NV12:
case VPX_IMG_FMT_I440:
case VPX_IMG_FMT_YV12:
case VPX_IMG_FMT_I42016:
case VPX_IMG_FMT_I44016: ycs = 1; break;
default: ycs = 0; break;
}
/* Calculate storage sizes. If the buffer was allocated externally, the width
* and height shouldn't be adjusted. */
w = d_w;
h = d_h;
s = (fmt & VPX_IMG_FMT_PLANAR) ? w : bps * w / 8;
s = (s + stride_align - 1) & ~(stride_align - 1);
stride_in_bytes = (fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? s * 2 : s;
/* Allocate the new image */
if (!img) {
img = (vpx_image_t *)calloc(1, sizeof(vpx_image_t));
if (!img) goto fail;
img->self_allocd = 1;
}
img->img_data = img_data;
if (!img_data) {
uint64_t alloc_size;
/* Calculate storage sizes given the chroma subsampling */
align = (1 << xcs) - 1;
w = (d_w + align) & ~align;
align = (1 << ycs) - 1;
h = (d_h + align) & ~align;
s = (fmt & VPX_IMG_FMT_PLANAR) ? w : bps * w / 8;
s = (s + stride_align - 1) & ~(stride_align - 1);
stride_in_bytes = (fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? s * 2 : s;
alloc_size = (fmt & VPX_IMG_FMT_PLANAR) ? (uint64_t)h * s * bps / 8
: (uint64_t)h * s;
if (alloc_size != (size_t)alloc_size) goto fail;
img->img_data = (uint8_t *)vpx_memalign(buf_align, (size_t)alloc_size);
img->img_data_owner = 1;
}
if (!img->img_data) goto fail;
img->fmt = fmt;
img->bit_depth = (fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 16 : 8;
img->w = w;
img->h = h;
img->x_chroma_shift = xcs;
img->y_chroma_shift = ycs;
img->bps = bps;
/* Calculate strides */
img->stride[VPX_PLANE_Y] = img->stride[VPX_PLANE_ALPHA] = stride_in_bytes;
img->stride[VPX_PLANE_U] = img->stride[VPX_PLANE_V] = stride_in_bytes >> xcs;
/* Default viewport to entire image */
if (!vpx_img_set_rect(img, 0, 0, d_w, d_h)) return img;
fail:
vpx_img_free(img);
return NULL;
}
vpx_image_t *vpx_img_alloc(vpx_image_t *img, vpx_img_fmt_t fmt,
unsigned int d_w, unsigned int d_h,
unsigned int align) {
return img_alloc_helper(img, fmt, d_w, d_h, align, align, NULL);
}
vpx_image_t *vpx_img_wrap(vpx_image_t *img, vpx_img_fmt_t fmt, unsigned int d_w,
unsigned int d_h, unsigned int stride_align,
unsigned char *img_data) {
/* By setting buf_align = 1, we don't change buffer alignment in this
* function. */
return img_alloc_helper(img, fmt, d_w, d_h, 1, stride_align, img_data);
}
int vpx_img_set_rect(vpx_image_t *img, unsigned int x, unsigned int y,
unsigned int w, unsigned int h) {
if (x <= UINT_MAX - w && x + w <= img->w && y <= UINT_MAX - h &&
y + h <= img->h) {
img->d_w = w;
img->d_h = h;
/* Calculate plane pointers */
if (!(img->fmt & VPX_IMG_FMT_PLANAR)) {
img->planes[VPX_PLANE_PACKED] =
img->img_data + x * img->bps / 8 + y * img->stride[VPX_PLANE_PACKED];
} else {
const int bytes_per_sample =
(img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 2 : 1;
unsigned char *data = img->img_data;
if (img->fmt & VPX_IMG_FMT_HAS_ALPHA) {
img->planes[VPX_PLANE_ALPHA] =
data + x * bytes_per_sample + y * img->stride[VPX_PLANE_ALPHA];
data += img->h * img->stride[VPX_PLANE_ALPHA];
}
img->planes[VPX_PLANE_Y] =
data + x * bytes_per_sample + y * img->stride[VPX_PLANE_Y];
data += img->h * img->stride[VPX_PLANE_Y];
if (img->fmt == VPX_IMG_FMT_NV12) {
img->planes[VPX_PLANE_U] =
data + (x >> img->x_chroma_shift) +
(y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
img->planes[VPX_PLANE_V] = img->planes[VPX_PLANE_U] + 1;
} else if (!(img->fmt & VPX_IMG_FMT_UV_FLIP)) {
img->planes[VPX_PLANE_U] =
data + (x >> img->x_chroma_shift) * bytes_per_sample +
(y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
data += (img->h >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
img->planes[VPX_PLANE_V] =
data + (x >> img->x_chroma_shift) * bytes_per_sample +
(y >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
} else {
img->planes[VPX_PLANE_V] =
data + (x >> img->x_chroma_shift) * bytes_per_sample +
(y >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
data += (img->h >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
img->planes[VPX_PLANE_U] =
data + (x >> img->x_chroma_shift) * bytes_per_sample +
(y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
}
}
return 0;
}
return -1;
}
void vpx_img_flip(vpx_image_t *img) {
/* Note: In the calculation pointer adjustment calculation, we want the
* rhs to be promoted to a signed type. Section 6.3.1.8 of the ISO C99
* standard indicates that if the adjustment parameter is unsigned, the
* stride parameter will be promoted to unsigned, causing errors when
* the lhs is a larger type than the rhs.
*/
img->planes[VPX_PLANE_Y] += (signed)(img->d_h - 1) * img->stride[VPX_PLANE_Y];
img->stride[VPX_PLANE_Y] = -img->stride[VPX_PLANE_Y];
img->planes[VPX_PLANE_U] += (signed)((img->d_h >> img->y_chroma_shift) - 1) *
img->stride[VPX_PLANE_U];
img->stride[VPX_PLANE_U] = -img->stride[VPX_PLANE_U];
img->planes[VPX_PLANE_V] += (signed)((img->d_h >> img->y_chroma_shift) - 1) *
img->stride[VPX_PLANE_V];
img->stride[VPX_PLANE_V] = -img->stride[VPX_PLANE_V];
img->planes[VPX_PLANE_ALPHA] +=
(signed)(img->d_h - 1) * img->stride[VPX_PLANE_ALPHA];
img->stride[VPX_PLANE_ALPHA] = -img->stride[VPX_PLANE_ALPHA];
}
void vpx_img_free(vpx_image_t *img) {
if (img) {
if (img->img_data && img->img_data_owner) vpx_free(img->img_data);
if (img->self_allocd) free(img);
}
}
|
