rotate

package

v1.2.3 Latest Latest Go to latest Published: Jan 6, 2024 License: BSD-3-Clause Imports: 10 Imported by: 2

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Package rotate provides methods for rotating images.

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func GetImageOrientation(ctx context.Context, r io.Reader) (string, error)

GetImageOrientation returns the string representation of the image orientation (0-8) in 'r'.

func NewRotateTransformation(ctx context.Context, uri string) (transform.Transformation, error)

NewRotateWriter returns a new `RotateTransformation` instance configure by 'uri' in the form of:

rotate://?orientation={ORIENTATION}

Where {ORIENTATION} is expected to be a valid EXIF orientation string (1-8).

func RotateImageWithDegrees(ctx context.Context, im image.Image, degrees float64) (image.Image, error)

RotateImageWithOrientation will rotate 'im' by 'degrees' degrees. Currently only values in units of 90 degrees or 0 are supported.

func RotateImageWithOrientation(ctx context.Context, im image.Image, orientation string) (image.Image, error)

RotateImageWithOrientation will rotate 'im' based on EXIF orientation value defined in 'orientation'.

type RotateTransformation struct {
	transform.Transformation
	// contains filtered or unexported fields
}

RotateTransformation is a struct that implements the `Transformation` interface for rotating images.

func (tr *RotateTransformation) Transform(ctx context.Context, im image.Image) (image.Image, error)

Transform will rotate 'im' and return a new `image.Image` instance.