Resize multiple images with Caire.

caire_batch.go

package main

import (
	"fmt"
	"log"
	"math/rand"
	"os"
	"runtime"
	"strconv"
	"time"

	"github.com/esimov/caire"
)

func main() {
	// Below is an example of using our PrintMemUsage() function
	// Print our starting memory usage (should be around 0mb)
	PrintMemUsage()

	files := []string{"waterfall.png", "sample-image.jpeg", "lighthouse.jpg", "landscape.jpg"}
	for _, filename := range files {
		f, err := os.OpenFile("../caire/input/"+filename, os.O_RDWR, 0666)
		if err != nil {
			log.Println("Read file error:", err.Error())
			log.Println(filename)
			return
		}

		f_write, err := os.OpenFile("file_"+strconv.Itoa(rand.Int())+".jpg", os.O_RDWR|os.O_CREATE, 0666)
		if err != nil {
			log.Fatal("Read file error:", err.Error())
		}

		p := &caire.Processor{
			NewWidth:   300,
			Percentage: false,
			Square:     true,
		}

		err = p.Process(f, f_write)
		if err != nil {
			log.Println("Failed to apply seam carving to the image", err.Error())
			return
		}
		f.Close()
		f_write.Close()

		// Print our memory usage at each interval
		PrintMemUsage()
		runtime.GC()
		PrintMemUsage()
		fmt.Println("=============================")
		time.Sleep(time.Second)
	}
}

// PrintMemUsage outputs the current, total and OS memory being used. As well as the number
// of garage collection cycles completed.
func PrintMemUsage() {
	var m runtime.MemStats
	runtime.ReadMemStats(&m)
	// For info on each, see: https://golang.org/pkg/runtime/#MemStats
	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))
	fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc))
	fmt.Printf("\tSys = %v MiB", bToMb(m.Sys))
	fmt.Printf("\tNumGC = %v\n", m.NumGC)
}

func bToMb(b uint64) uint64 {
	return b / 1024 / 1024
}