images

Documentation

Index

• func Cropped(ext string, read io.ReadSeeker, x1, y1, x2, y2 int) (cropped io.ReadSeeker, err error)
• func FixJpgOrientation(data []byte) (oriented []byte)
• func MaybePreprocessImage(filename string, data []byte, width, height int) (resized io.ReadSeeker, w int, h int)
• func Resized(ext string, read io.ReadSeeker, width, height int, mode string) (resized io.ReadSeeker, w int, h int)
• type DecodeOpts
• type FlipDirection

Functions

func Cropped

func Cropped(ext string, read io.ReadSeeker, x1, y1, x2, y2 int) (cropped io.ReadSeeker, err error)

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.