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Exif.php: add helper query functions

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Zankaria 2025-03-22 01:47:50 +01:00
parent e47623cdf6
commit 1a82462d0a
1 changed files with 36 additions and 0 deletions
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36
inc/Data/Exif.php
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@ -21,4 +21,40 @@ class Exif {
public static function exifOrientationOnSide(int $exif_orientation): bool {
return $exif_orientation >= 5 && $exif_orientation <= 8;
}
/**
* Gives the rotation in degrees of the given exif orientation.
*
* @param int $exif_orientation One of the EXIF_ORIENTATION_* constants.
* @return int Rotation in degrees.
*/
public static function exifOrientationDegrees(int $exif_orientation): int {
switch ($exif_orientation) {
case self::EXIF_ORIENTATION_UNDEFINED:
case self::EXIF_ORIENTATION_0_UPRIGHT:
case self::EXIF_ORIENTATION_0_FLIPPED:
return 0;
case self::EXIF_ORIENTATION_180_UPRIGHT:
case self::EXIF_ORIENTATION_180_FLIPPED:
return 180;
case self::EXIF_ORIENTATION_90_UPRIGHT:
case self::EXIF_ORIENTATION_90_FLIPPED:
return 90;
case self::EXIF_ORIENTATION_270_UPRIGHT:
case self::EXIF_ORIENTATION_270_FLIPPED:
return 270;
default:
throw new \RuntimeException("Invalid exif orientation '$exif_orientation'");
}
}
/**
* If the given exif orientation flips the image.
*
* @param int $exif_orientation One of the EXIF_ORIENTATION_* constants.
* @return bool If the image is flipped.
*/
public static function exifOrientationIsFlipped(int $exif_orientation): bool {
return $exif_orientation % 2 == 0;
}
}