generate_patchwork_of_photos.go

/*
 * Generate gift paper from random images.
 */

package main

import (
	"fmt"
	"image"
	"image/jpeg"
	"math/rand"
	"os"
	"path/filepath"
	"sync"
	"time"

	"github.com/deiwin/picasso"
	"github.com/labstack/gommon/log"
)

const (
	Max  = 100
	root = "/Volumes/family_drive/photo/google/Takeout/Google Photos"
)

func main() {
	var wg sync.WaitGroup
	for year := 2017; year <= 2020; year++ {
		wg.Add(1)
		go paper(year, &wg)
	}
	wg.Wait()
}

func paper(year int, wg *sync.WaitGroup) {
	defer wg.Done()
	picks := make([]image.Image, 0)
	q := fmt.Sprintf("%s/%d*", root, year)
	fmt.Println("glob: " + q)
	dirs, err := filepath.Glob(q)
	if err != nil {
		panic(err)
	}
	// shuffle dirs order
	rand.Seed(time.Now().UnixNano())
	rand.Shuffle(len(dirs), func(i, j int) { dirs[i], dirs[j] = dirs[j], dirs[i] })

	// for each directory
	for _, dir := range dirs {
		if len(picks) > Max {
			continue
		}
		photos, err := filepath.Glob(dir + "/*.jpg")
		if err != nil {
			panic(err)
		}
		if len(photos) == 0 {
			continue
		}
		p, err := pick(photos)
		if err != nil {
			log.Error(err)
			continue
		}
		picks = append(picks, p)
	}
	fmt.Printf("found: %d photos\n", len(picks))

	//	gray := color.RGBA{0xaf, 0xaf, 0xaf, 0xff}
	paper := picasso.DrawGridLayout(picks, 2550)
	fn := fmt.Sprintf("paper_%d_%d.jpg", year, Max)
	fh, err := os.Create(fn)
	defer fh.Close()
	if err != nil {
		panic(err)
	}
	jpeg.Encode(fh, paper, nil)
	fmt.Printf("save: %s\n", fn)
}

func pick(photos []string) (image.Image, error) {
	randomIndex := rand.Intn(len(photos))
	pick := photos[randomIndex]
	fh, err := os.Open(pick)
	if err != nil {
		return nil, err
	}
	defer fh.Close()
	return jpeg.Decode(fh)
}