47 lines
1 KiB
Go
47 lines
1 KiB
Go
package thumb
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import (
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"image"
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"github.com/disintegration/imaging"
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)
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const (
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OrientationUnspecified int = 0
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OrientationNormal = 1
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OrientationFlipH = 2
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OrientationRotate180 = 3
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OrientationFlipV = 4
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OrientationTranspose = 5
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OrientationRotate270 = 6
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OrientationTransverse = 7
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OrientationRotate90 = 8
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)
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// Rotate rotates an image based on the Exif orientation.
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func Rotate(img image.Image, o int) image.Image {
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switch o {
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case OrientationUnspecified:
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// Do nothing.
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case OrientationNormal:
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// Do nothing.
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case OrientationFlipH:
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img = imaging.FlipH(img)
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case OrientationFlipV:
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img = imaging.FlipV(img)
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case OrientationRotate90:
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img = imaging.Rotate90(img)
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case OrientationRotate180:
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img = imaging.Rotate180(img)
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case OrientationRotate270:
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img = imaging.Rotate270(img)
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case OrientationTranspose:
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img = imaging.Transpose(img)
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case OrientationTransverse:
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img = imaging.Transverse(img)
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default:
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log.Debugf("thumb: invalid orientation %d (rotate)", o)
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}
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return img
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}
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