image2

README

image2

Package image2 fixes problems of the image package within the standard library with decoding JPEG images that are corrupt or broken.

For discussion, see: https://github.com/golang/go/issues/10447

This patch is mainly due to the suggestion of "whorfin" in this comment: https://github.com/golang/go/issues/10447#issuecomment-843447295 and some code and tests of mine

Usage is like the normal jpeg sub package of image, just with a different path (see the example test).

License

MIT

Documentation

Overview

Package image2 fixes problems of the image package within the standard library with decoding JPEG images that are corrupt or broken.

For discussion, see: https://github.com/golang/go/issues/10447

This patch is mainly due to the suggestion of "whorfin" in this comment: https://github.com/golang/go/issues/10447#issuecomment-843447295 and some code and tests of mine

Usage is like the normal jpeg sub package of image, just with a different path (see the example test).

Example

package main

import (
	"encoding/base64"
	"fmt"
	"image"
	"log"
	"strings"

	// Package image/jpeg is not used explicitly in the code below,
	// but is imported for its initialization side-effect, which allows
	// image.Decode to understand JPEG formatted images. Uncomment these
	// two lines to also understand GIF and PNG images:
	// _ "image/gif"
	// _ "image/png"
	_ "gitlab.com/golang-utils/image2/jpeg"
)

func main() {
	// Decode the JPEG data. If reading from file, create a reader with
	//
	// reader, err := os.Open("testdata/video-001.q50.420.jpeg")
	// if err != nil {
	//     log.Fatal(err)
	// }
	// defer reader.Close()
	reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data))
	m, _, err := image.Decode(reader)
	if err != nil {
		log.Fatal(err)
	}
	bounds := m.Bounds()

	// Calculate a 16-bin histogram for m's red, green, blue and alpha components.
	//
	// An image's bounds do not necessarily start at (0, 0), so the two loops start
	// at bounds.Min.Y and bounds.Min.X. Looping over Y first and X second is more
	// likely to result in better memory access patterns than X first and Y second.
	var histogram [16][4]int
	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
		for x := bounds.Min.X; x < bounds.Max.X; x++ {
			r, g, b, a := m.At(x, y).RGBA()
			// A color's RGBA method returns values in the range [0, 65535].
			// Shifting by 12 reduces this to the range [0, 15].
			histogram[r>>12][0]++
			histogram[g>>12][1]++
			histogram[b>>12][2]++
			histogram[a>>12][3]++
		}
	}

	// Print the results.
	fmt.Printf("%-14s %6s %6s %6s %6s\n", "bin", "red", "green", "blue", "alpha")
	for i, x := range histogram {
		fmt.Printf("0x%04x-0x%04x: %6d %6d %6d %6d\n", i<<12, (i+1)<<12-1, x[0], x[1], x[2], x[3])
	}
}

const data = `
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0HwyBXGeRjmrcUhMg2ghezd//rUUVcTKW5s2jZtY/QDaOKKKK8ip8bPRj8KP/9k=
`

Output:

bin               red  green   blue  alpha
0x0000-0x0fff:    364    790   7242      0
0x1000-0x1fff:    645   2967   1039      0
0x2000-0x2fff:   1072   2299    979      0
0x3000-0x3fff:    820   2266    980      0
0x4000-0x4fff:    537   1305    541      0
0x5000-0x5fff:    319    962    261      0
0x6000-0x6fff:    322    375    177      0
0x7000-0x7fff:    601    279    214      0
0x8000-0x8fff:   3478    227    273      0
0x9000-0x9fff:   2260    234    329      0
0xa000-0xafff:    921    282    373      0
0xb000-0xbfff:    321    335    397      0
0xc000-0xcfff:    229    388    298      0
0xd000-0xdfff:    260    414    277      0
0xe000-0xefff:    516    428    298      0
0xf000-0xffff:   2785   1899   1772  15450

Example (DecodeConfig)

package main

import (
	"encoding/base64"
	"fmt"
	"image"
	"log"
	"strings"

	// Package image/jpeg is not used explicitly in the code below,
	// but is imported for its initialization side-effect, which allows
	// image.Decode to understand JPEG formatted images. Uncomment these
	// two lines to also understand GIF and PNG images:
	// _ "image/gif"
	// _ "image/png"
	_ "gitlab.com/golang-utils/image2/jpeg"
)

func main() {
	reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data))
	config, format, err := image.DecodeConfig(reader)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println("Width:", config.Width, "Height:", config.Height, "Format:", format)
}

const data = `
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