316cde2569
* Remove disintegration/imaging dependency * Simplify FillCenter logic --------- Co-authored-by: Mattermost Build <build@mattermost.com>
78 строки
2.2 KiB
Go
78 строки
2.2 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package imaging
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import (
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"fmt"
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"image"
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"io"
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"github.com/anthonynsimon/bild/transform"
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"github.com/rwcarlsen/goexif/exif"
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)
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const (
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/*
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EXIF Image Orientations
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1 2 3 4 5 6 7 8
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888888 888888 88 88 8888888888 88 88 8888888888
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88 88 88 88 88 88 88 88 88 88 88 88
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8888 8888 8888 8888 88 8888888888 8888888888 88
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88 88 88 88
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88 88 888888 888888
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*/
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Upright = iota + 1
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UprightMirrored
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UpsideDown
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UpsideDownMirrored
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RotatedCWMirrored
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RotatedCCW
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RotatedCCWMirrored
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RotatedCW
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)
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// MakeImageUpright changes the orientation of the given image.
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func MakeImageUpright(img image.Image, orientation int) image.Image {
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switch orientation {
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case UprightMirrored:
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return transform.FlipH(img)
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case UpsideDown:
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return transform.Rotate(img, 180, &transform.RotationOptions{ResizeBounds: true})
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case UpsideDownMirrored:
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return transform.FlipV(img)
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case RotatedCWMirrored:
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return transform.Rotate(transform.FlipH(img), -90, &transform.RotationOptions{ResizeBounds: true})
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case RotatedCCW:
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return transform.Rotate(img, 90, &transform.RotationOptions{ResizeBounds: true})
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case RotatedCCWMirrored:
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return transform.Rotate(transform.FlipV(img), -90, &transform.RotationOptions{ResizeBounds: true})
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case RotatedCW:
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return transform.Rotate(img, 270, &transform.RotationOptions{ResizeBounds: true})
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default:
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return img
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}
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}
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// GetImageOrientation reads the input data and returns the EXIF encoded
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// image orientation.
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func GetImageOrientation(input io.Reader) (int, error) {
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exifData, err := exif.Decode(input)
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if err != nil {
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return Upright, fmt.Errorf("failed to decode exif data: %w", err)
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}
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tag, err := exifData.Get("Orientation")
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if err != nil {
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return Upright, fmt.Errorf("failed to get orientation field from exif data: %w", err)
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}
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orientation, err := tag.Int(0)
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if err != nil {
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return Upright, fmt.Errorf("failed to get value from exif tag: %w", err)
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}
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return orientation, nil
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}
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