mirror of
https://github.com/axllent/goptimize.git
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First commit
This commit is contained in:
Ralph Slooten
260
goptimize.go
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260
goptimize.go
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@@ -0,0 +1,260 @@
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package main
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import (
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"fmt"
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"image/gif"
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"image/jpeg"
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"image/png"
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"io"
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"io/ioutil"
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"math"
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"os"
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"os/exec"
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"path/filepath"
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"github.com/disintegration/imaging"
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"golang.org/x/image/bmp"
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"golang.org/x/image/tiff"
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)
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// Goptimize downscales and optimizes an existing image
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func Goptimize(file string) {
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info, err := os.Stat(file)
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if err != nil {
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fmt.Printf("%s doesn't exist\n", file)
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return
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}
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if !info.Mode().IsRegular() {
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// not a file
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fmt.Printf("%s is not a file\n", file)
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return
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}
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// open original, rotate if neccesary
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src, err := imaging.Open(file, imaging.AutoOrientation(true))
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if err != nil {
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fmt.Printf("%v (%s)\n", err, file)
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return
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}
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format, err := imaging.FormatFromFilename(file)
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if err != nil {
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fmt.Printf("Cannot detect format: %v\n", err)
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return
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}
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outFilename := filepath.Base(file)
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outDir := filepath.Dir(file)
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dstFile := filepath.Join(outDir, outFilename)
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if outputDir != "" {
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dstFile = filepath.Join(outputDir, outFilename)
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}
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// get original image size
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srcBounds := src.Bounds()
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srcW := srcBounds.Dx()
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srcH := srcBounds.Dy()
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// Ensure scaling does not upscale image
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imgMaxW := maxWidth
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if imgMaxW == 0 || imgMaxW > srcW {
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imgMaxW = srcW
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}
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imgMaxH := maxHeight
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if imgMaxH == 0 || imgMaxH > srcH {
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imgMaxH = srcH
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}
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resized := imaging.Fit(src, imgMaxW, imgMaxH, imaging.Lanczos)
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dstBounds := resized.Bounds()
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resultW := dstBounds.Dx()
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resultH := dstBounds.Dy()
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tmpFile, err := ioutil.TempFile(os.TempDir(), "Goptimized-")
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if err != nil {
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fmt.Printf("Cannot create temporary file: %v\n", err)
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return
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}
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defer os.Remove(tmpFile.Name())
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if format.String() == "JPEG" {
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err = jpeg.Encode(tmpFile, resized, &jpeg.Options{Quality: quality})
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} else if format.String() == "PNG" {
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err = png.Encode(tmpFile, resized)
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} else if format.String() == "GIF" {
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err = gif.Encode(tmpFile, resized, nil)
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} else if format.String() == "TIFF" {
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err = tiff.Encode(tmpFile, resized, nil)
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} else if format.String() == "BMP" {
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err = bmp.Encode(tmpFile, resized)
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} else {
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fmt.Printf("Cannot Goptimize %s files\n", format.String())
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return
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}
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if err != nil {
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fmt.Printf("Error saving output file: %v\n", err)
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return
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}
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// get the tempoary filename before closing
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tmpFilename := tmpFile.Name()
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// close the temp file to release pointers so we can
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// modify it with system processes
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tmpFile.Close()
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// optimize
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if format.String() == "JPEG" {
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// run one or the other, both don't do anything
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if jpegtran != "" {
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RunOptimiser(tmpFilename, true, jpegtran, "-optimize", "-outfile")
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} else if jpegoptim != "" {
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RunOptimiser(tmpFilename, false, jpegoptim, "-f", "-s", "-o")
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}
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} else if format.String() == "PNG" {
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if pngquant != "" {
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RunOptimiser(tmpFilename, true, pngquant, "-f", "--output")
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}
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if optipng != "" {
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RunOptimiser(tmpFilename, true, optipng, "-out")
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}
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} else if format.String() == "GIF" {
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if gifsicle != "" {
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RunOptimiser(tmpFilename, true, gifsicle, "-o")
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}
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}
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// re-open potentiall modified temporary file
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tmpFile, err = os.Open(tmpFilename)
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if err != nil {
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fmt.Printf("Error reopening temporary file: %v\n", err)
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return
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}
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defer tmpFile.Close()
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// original file stats
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srcStat, _ := os.Stat(file)
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srcSize := srcStat.Size()
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// optimized file stats
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dstStat, _ := tmpFile.Stat()
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dstSize := dstStat.Size()
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// transfer the original file permissions to the new file
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if err = os.Chmod(tmpFile.Name(), srcStat.Mode()); err != nil {
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fmt.Printf("Error setting file permissions: %v\n", err)
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return
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}
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if !skipPreserveModTimes {
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// transfer original modification times
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mtime := srcStat.ModTime()
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atime := mtime // use mtime as we cannot get atime
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if err := os.Chtimes(tmpFile.Name(), atime, mtime); err != nil {
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fmt.Printf("Error setting file timestamp: %v\n", err)
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}
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}
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savedPercent := 100 - math.Round(float64(dstSize)/float64(srcSize)*100)
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if dstSize < srcSize {
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// output is smaller
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if err := os.Rename(tmpFile.Name(), dstFile); err != nil {
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fmt.Printf("Error renaming file: %v\n", err)
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return
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}
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fmt.Printf("Goptimized %s (%dx%d %s/%s %v%%)\n", dstFile, resultW, resultH, ByteCountSI(dstSize), ByteCountSI(srcSize), savedPercent)
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} else {
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if outputDir != "" {
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// just copy the original
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if err := os.Rename(file, dstFile); err != nil {
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fmt.Printf("Error renaming file: %v\n", err)
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return
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}
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}
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// we didn't actually any scaling optimizing
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fmt.Printf("Goptimized %s (%dx%d %s/%s %v%%)\n", dstFile, srcW, srcH, ByteCountSI(srcSize), ByteCountSI(srcSize), 0)
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}
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}
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// RunOptimiser will run the specified command on a copy of the original file
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// and overwrite if the output is smaller than the original
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func RunOptimiser(src string, outfile bool, args ...string) {
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// create a new temp file
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tmpFile, err := ioutil.TempFile(os.TempDir(), "Goptimized-")
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if err != nil {
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fmt.Printf("Cannot create temporary file: %v\n", err)
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return
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}
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defer os.Remove(tmpFile.Name())
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source, err := os.Open(src)
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// s, _ := source.Stat()
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// log.Printf("%v\n", s.Size())
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if err != nil {
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fmt.Printf("Cannot open temporary file: %v\n", err)
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return
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}
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defer source.Close()
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if _, err := io.Copy(tmpFile, source); err != nil {
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fmt.Printf("Cannot copy source file: %v\n", err)
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return
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}
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// add the filename to the args
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args = append(args, tmpFile.Name())
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if outfile {
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// most commands require a second filename to overwrite the original
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args = append(args, tmpFile.Name())
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}
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// fmt.Println(args)
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// execute the command
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cmd := exec.Command(args[0], args[1:]...)
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err = cmd.Run()
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// out, err := cmd.Output()
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if err != nil {
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// there was an error
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fmt.Printf("%s: %v\n", args[0], err)
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return
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}
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// fmt.Println(string(out))
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tmpFilename := tmpFile.Name()
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srcStat, _ := source.Stat()
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srcSize := srcStat.Size()
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dstStat, _ := os.Stat(tmpFilename)
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dstSize := dstStat.Size()
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// ensure file pointers are closed before renaming
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tmpFile.Close()
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source.Close()
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if dstSize < srcSize {
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if err := os.Rename(tmpFilename, src); err != nil {
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fmt.Printf("Error renaming file: %v\n", err)
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return
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}
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// fmt.Println(args[0], "=", srcSize, "to", dstSize, "(wrote to", source.Name(), ")")
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} else {
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// fmt.Println(args[0], "!=", srcSize, "to", dstSize)
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}
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}
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// ByteCountSI returns a human readable size from int64 bytes
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func ByteCountSI(b int64) string {
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const unit = 1000
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if b < unit {
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return fmt.Sprintf("%dB", b)
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}
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div, exp := int64(unit), 0
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for n := b / unit; n >= unit; n /= unit {
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div *= unit
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exp++
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}
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return fmt.Sprintf("%.1f%cB", float64(b)/float64(div), "kMGTPE"[exp])
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}
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