images

package
v0.0.0-...-935c85c Latest Latest
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Published: Oct 17, 2020 License: Apache-2.0 Imports: 13 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func FixJpgOrientation

func FixJpgOrientation(data []byte) (oriented []byte)

many code is copied from http://camlistore.org/pkg/images/images.go

func MaybePreprocessImage

func MaybePreprocessImage(filename string, data []byte, width, height int) (resized io.ReadSeeker, w int, h int)

* Preprocess image files on client side. * 1. possibly adjust the orientation * 2. resize the image to a width or height limit * 3. remove the exif data * Call this function on any file uploaded to SeaweedFS *

func Resized

func Resized(ext string, read io.ReadSeeker, width, height int, mode string) (resized io.ReadSeeker, w int, h int)

Types

type DecodeOpts

type DecodeOpts struct {
	// Rotate specifies how to rotate the image.
	// If nil, the image is rotated automatically based on EXIF metadata.
	// If an int, Rotate is the number of degrees to rotate
	// counter clockwise and must be one of 0, 90, -90, 180, or
	// -180.
	Rotate interface{}

	// Flip specifies how to flip the image.
	// If nil, the image is flipped automatically based on EXIF metadata.
	// Otherwise, Flip is a FlipDirection bitfield indicating how to flip.
	Flip interface{}
}

type FlipDirection

type FlipDirection int

The FlipDirection type is used by the Flip option in DecodeOpts to indicate in which direction to flip an image.

const (
	FlipVertical FlipDirection = 1 << iota
	FlipHorizontal
)

FlipVertical and FlipHorizontal are two possible FlipDirections values to indicate in which direction an image will be flipped.

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