blob: 13fe8bfc73002fa70531c5f043b1c5f7c428de8e [file] [log] [blame]
// Copyright 2022 Google LLC
// SPDX-License-Identifier: BSD-2-Clause
#include "avifexif.h"
#include "avif/avif.h"
uint8_t avifImageGetExifOrientationFromIrotImir(const avifImage * image)
{
if ((image->transformFlags & AVIF_TRANSFORM_IROT) && (image->irot.angle == 1)) {
if (image->transformFlags & AVIF_TRANSFORM_IMIR) {
if (image->imir.axis) {
return 7; // 90 degrees anti-clockwise then swap left and right.
}
return 5; // 90 degrees anti-clockwise then swap top and bottom.
}
return 6; // 90 degrees anti-clockwise.
}
if ((image->transformFlags & AVIF_TRANSFORM_IROT) && (image->irot.angle == 2)) {
if (image->transformFlags & AVIF_TRANSFORM_IMIR) {
if (image->imir.axis) {
return 4; // 180 degrees anti-clockwise then swap left and right.
}
return 2; // 180 degrees anti-clockwise then swap top and bottom.
}
return 3; // 180 degrees anti-clockwise.
}
if ((image->transformFlags & AVIF_TRANSFORM_IROT) && (image->irot.angle == 3)) {
if (image->transformFlags & AVIF_TRANSFORM_IMIR) {
if (image->imir.axis) {
return 5; // 270 degrees anti-clockwise then swap left and right.
}
return 7; // 270 degrees anti-clockwise then swap top and bottom.
}
return 8; // 270 degrees anti-clockwise.
}
if (image->transformFlags & AVIF_TRANSFORM_IMIR) {
if (image->imir.axis) {
return 2; // Swap left and right.
}
return 4; // Swap top and bottom.
}
return 1; // Default orientation ("top-left", no-op).
}
avifResult avifSetExifOrientation(avifRWData * exif, uint8_t orientation)
{
size_t offset;
const avifResult result = avifGetExifOrientationOffset(exif->data, exif->size, &offset);
if (result != AVIF_RESULT_OK) {
return result;
}
if (offset < exif->size) {
exif->data[offset] = orientation;
return AVIF_RESULT_OK;
}
// No Exif orientation was found.
if (orientation == 1) {
// The default orientation is 1, so if the given orientation is 1 too, do nothing.
return AVIF_RESULT_OK;
}
// Adding an orientation tag to an Exif payload is involved.
return AVIF_RESULT_NOT_IMPLEMENTED;
}