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package main
import (
"bufio"
"flag"
"fmt"
"image"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
"math"
"os"
"github.com/BurntSushi/graphics-go/graphics"
"github.com/mattn/go-sixel"
)
var (
fBlur = flag.String("blur", "", "Blur image by [Dev,Size]")
fResize = flag.String("resize", "", "Resize image by [WxH]")
fRotate = flag.Float64("rotate", 0.0, "Rotate image by [N] deg")
)
func render(filename string) error {
var f *os.File
var err error
if filename != "-" {
f, err = os.Open(filename)
if err != nil {
return err
}
defer f.Close()
} else {
f = os.Stdin
}
img, _, err := image.Decode(f)
if err != nil {
return err
}
if *fResize != "" {
var w, h uint
fmt.Sscanf(*fResize, "%dx%d", &w, &h)
rx := float64(img.Bounds().Dx()) / float64(w)
ry := float64(img.Bounds().Dy()) / float64(h)
if rx < ry {
w = uint(float64(img.Bounds().Dx()) / ry)
} else {
h = uint(float64(img.Bounds().Dy()) / rx)
}
tmp := image.NewNRGBA64(image.Rect(0, 0, int(w), int(h)))
err = graphics.Scale(tmp, img)
if err != nil {
return err
}
img = tmp
}
if *fRotate != 0.0 {
d := math.Sqrt(math.Pow(float64(img.Bounds().Dx()), 2) + math.Pow(float64(img.Bounds().Dy()), 2))
sin, cos := math.Sincos(math.Atan2(float64(img.Bounds().Dx()), float64(img.Bounds().Dy())) + *fRotate)
if sin < cos {
sin = cos
} else {
cos = sin
}
tmp := image.NewNRGBA64(image.Rect(0, 0, int(cos*d), int(sin*d)))
err = graphics.Rotate(tmp, img, &graphics.RotateOptions{*fRotate})
if err != nil {
return err
}
img = tmp
}
if *fBlur != "" {
var d float64
var s int
fmt.Sscanf(*fBlur, "%f,%d", &d, &s)
tmp := image.NewNRGBA64(img.Bounds())
err = graphics.Blur(tmp, img, &graphics.BlurOptions{d, s})
if err != nil {
return err
}
img = tmp
}
buf := bufio.NewWriter(os.Stdout)
defer buf.Flush()
enc := sixel.NewEncoder(buf)
enc.Dither = true
return enc.Encode(img)
}
func main() {
flag.Usage = func() {
fmt.Println("Usage of " + os.Args[0] + ": gosr [images]")
flag.PrintDefaults()
}
flag.Parse()
if flag.NArg() == 0 {
flag.Usage()
os.Exit(1)
}
for _, arg := range flag.Args() {
err := render(arg)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
}
}
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