/src/libavif/apps/shared/avifexif.c
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1 | | // Copyright 2022 Google LLC |
2 | | // SPDX-License-Identifier: BSD-2-Clause |
3 | | |
4 | | #include "avifexif.h" |
5 | | #include "avif/avif.h" |
6 | | |
7 | | uint8_t avifImageGetExifOrientationFromIrotImir(const avifImage * image) |
8 | 0 | { |
9 | 0 | if ((image->transformFlags & AVIF_TRANSFORM_IROT) && (image->irot.angle == 1)) { |
10 | 0 | if (image->transformFlags & AVIF_TRANSFORM_IMIR) { |
11 | 0 | if (image->imir.axis) { |
12 | 0 | return 7; // 90 degrees anti-clockwise then swap left and right. |
13 | 0 | } |
14 | 0 | return 5; // 90 degrees anti-clockwise then swap top and bottom. |
15 | 0 | } |
16 | 0 | return 8; // 90 degrees anti-clockwise. |
17 | 0 | } |
18 | 0 | if ((image->transformFlags & AVIF_TRANSFORM_IROT) && (image->irot.angle == 2)) { |
19 | 0 | if (image->transformFlags & AVIF_TRANSFORM_IMIR) { |
20 | 0 | if (image->imir.axis) { |
21 | 0 | return 4; // 180 degrees anti-clockwise then swap left and right. |
22 | 0 | } |
23 | 0 | return 2; // 180 degrees anti-clockwise then swap top and bottom. |
24 | 0 | } |
25 | 0 | return 3; // 180 degrees anti-clockwise. |
26 | 0 | } |
27 | 0 | if ((image->transformFlags & AVIF_TRANSFORM_IROT) && (image->irot.angle == 3)) { |
28 | 0 | if (image->transformFlags & AVIF_TRANSFORM_IMIR) { |
29 | 0 | if (image->imir.axis) { |
30 | 0 | return 5; // 270 degrees anti-clockwise then swap left and right. |
31 | 0 | } |
32 | 0 | return 7; // 270 degrees anti-clockwise then swap top and bottom. |
33 | 0 | } |
34 | 0 | return 6; // 270 degrees anti-clockwise. |
35 | 0 | } |
36 | 0 | if (image->transformFlags & AVIF_TRANSFORM_IMIR) { |
37 | 0 | if (image->imir.axis) { |
38 | 0 | return 2; // Swap left and right. |
39 | 0 | } |
40 | 0 | return 4; // Swap top and bottom. |
41 | 0 | } |
42 | 0 | return 1; // Default orientation ("top-left", no-op). |
43 | 0 | } |
44 | | |
45 | | avifResult avifSetExifOrientation(avifRWData * exif, uint8_t orientation) |
46 | 235 | { |
47 | 235 | size_t offset; |
48 | 235 | const avifResult result = avifGetExifOrientationOffset(exif->data, exif->size, &offset); |
49 | 235 | if (result != AVIF_RESULT_OK) { |
50 | 133 | return result; |
51 | 133 | } |
52 | 102 | if (offset < exif->size) { |
53 | 59 | exif->data[offset] = orientation; |
54 | 59 | return AVIF_RESULT_OK; |
55 | 59 | } |
56 | | // No Exif orientation was found. |
57 | 43 | if (orientation == 1) { |
58 | | // The default orientation is 1, so if the given orientation is 1 too, do nothing. |
59 | 43 | return AVIF_RESULT_OK; |
60 | 43 | } |
61 | | // Adding an orientation tag to an Exif payload is involved. |
62 | 0 | return AVIF_RESULT_NOT_IMPLEMENTED; |
63 | 43 | } |