images

Documentation

Index

• func Asset(name string) ([]byte, error)
• func AssetDir(name string) ([]string, error)
• func AssetInfo(name string) (os.FileInfo, error)
• func AssetNames() []string
• func FixJpgOrientation(data []byte) (oriented []byte)
• func MaybePreprocessImage(filename string, data []byte, width, height int) (resized []byte, w int, h int)
• func MustAsset(name string) []byte
• func Resized(ext string, data []byte, width, height int, mode string) (resized []byte, w int, h int)
• func RestoreAsset(dir, name string) error
• func RestoreAssets(dir, name string) error
• type DecodeOpts
• type FlipDirection

Functions

func Asset

func Asset(name string) ([]byte, error)

Asset loads and returns the asset for the given name. It returns an error if the asset could not be found or could not be loaded.

func AssetDir

func AssetDir(name string) ([]string, error)

AssetDir returns the file names below a certain directory embedded in the file by go-bindata. For example if you run go-bindata on data/... and data contains the following hierarchy:

data/
  foo.txt
  img/
    a.png
    b.png

then AssetDir("data") would return []string{"foo.txt", "img"} AssetDir("data/img") would return []string{"a.png", "b.png"} AssetDir("foo.txt") and AssetDir("notexist") would return an error AssetDir("") will return []string{"data"}.

func AssetInfo

func AssetInfo(name string) (os.FileInfo, error)

AssetInfo loads and returns the asset info for the given name. It returns an error if the asset could not be found or could not be loaded.

func AssetNames

func AssetNames() []string

AssetNames returns the names of the assets.

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 []byte, 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 MustAsset

func MustAsset(name string) []byte

MustAsset is like Asset but panics when Asset would return an error. It simplifies safe initialization of global variables.

func Resized

func Resized(ext string, data []byte, width, height int, mode string) (resized []byte, w int, h int)

func RestoreAsset

func RestoreAsset(dir, name string) error

RestoreAsset restores an asset under the given directory

func RestoreAssets

func RestoreAssets(dir, name string) error

RestoreAssets restores an asset under the given directory recursively

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.