imageutil

package

v0.1.0 Latest Latest Go to latest Published: Mar 15, 2018 License: MIT Imports: 10 Imported by: 3

Details

Valid go.mod file

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Repository

github.com/go-oss/image

Links

Open Source Insights

Documentation ¶

Overview ¶

Package imageutil wrapper for jpeg.DecodeWithQuality & remove exif, apply orientation.

Example ¶

// This example demonstrates decoding a JPEG image and remove EXIF, apply orientation.
package main

import (
	"encoding/base64"
	"fmt"
	"io/ioutil"
	"log"
	"strings"

	"github.com/go-oss/image/imageutil"
)

func main() {
	reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data))
	img, err := imageutil.Decode(reader)
	if err != nil {
		log.Fatal(err)
	}

	// print metadata
	fmt.Printf("Original MIME Type: %s\n", img.OriginalMIMEType)
	fmt.Printf("Original Image Quality: %d\n", img.Quality)

	// crop square
	img.FitCrop()

	// encode to jpeg image same original image quality
	err = img.EncodeJPEG(ioutil.Discard)
	if err != nil {
		log.Fatal(err)
	}
}

const data = `
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`

Output:

Index ¶

Variables
func FitCrop(img image.Image) image.Image
func RemoveExif(r io.Reader) (io.Reader, error)
type Image
- func Decode(file io.Reader) (*Image, error)
- func (img *Image) EncodeJPEG(writer io.Writer) error
- func (img *Image) FitCrop()
type MIMEType
- func DetectMimeType(fileHeader []byte) MIMEType
- func MIMETypeByType(typ string) MIMEType
- func (m MIMEType) Ext() string
- func (m MIMEType) String() string

Examples ¶

Package

Constants ¶

This section is empty.

Variables ¶

View Source

var (
	// ErrUnsupportedFileType represents unsupported error.
	ErrUnsupportedFileType = errors.New("unsupported file type")
)

Functions ¶

func FitCrop ¶

func FitCrop(img image.Image) image.Image

FitCrop fit to narrow side of image and crop square.

func RemoveExif ¶

func RemoveExif(r io.Reader) (io.Reader, error)

RemoveExif remove JPEG EXIF metadata and rotate image for orientation tag.

Types ¶

type Image ¶

type Image struct {
	Image            image.Image
	Quality          int
	OriginalMIMEType MIMEType
}

Image represents image.Image wrapper.

func Decode ¶

func Decode(file io.Reader) (*Image, error)

Decode image file.

func (*Image) EncodeJPEG ¶

func (img *Image) EncodeJPEG(writer io.Writer) error

EncodeJPEG encodes image struct to jpeg image.

func (*Image) FitCrop ¶

func (img *Image) FitCrop()

FitCrop for Image struct.

type MIMEType ¶

type MIMEType uint8

MIMEType represents MIME type for image file.

const (
	// UndefinedType represents unknown image type.
	UndefinedType MIMEType = iota
	// JPEG represents jpeg image type.
	JPEG
	// PNG represents png image type.
	PNG
	// GIF represents gif image type.
	GIF
	// WEBP represents webp image type.
	WEBP
)

func DetectMimeType ¶

func DetectMimeType(fileHeader []byte) MIMEType

DetectMimeType detects MIMEType for image file.

func MIMETypeByType ¶

func MIMETypeByType(typ string) MIMEType

MIMETypeByType returns MIMEType by type string.

func (MIMEType) Ext ¶

func (m MIMEType) Ext() string

Ext returns file extension.

func (MIMEType) String ¶

func (m MIMEType) String() string

Source Files ¶

View all Source files

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