ql-print: add a simple printing tool

ql-print/main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"image"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
+
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"janouch.name/sklad/imgutil"
+	"janouch.name/sklad/ql"
+)
+
+var scale = flag.Int("scale", 1, "integer upscaling")
+var rotate = flag.Bool("rotate", false, "print sideways")
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s IMAGE\n", os.Args[0])
+		flag.PrintDefaults()
+	}
+
+	flag.Parse()
+	if flag.NArg() != 1 {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	// Open the picture.
+	f, err := os.Open(flag.Arg(0))
+	if err != nil {
+		log.Fatalln(err)
+	}
+	defer f.Close()
+
+	// Load and eventually transform the picture.
+	img, _, err := image.Decode(f)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	if *scale > 1 {
+		img = &imgutil.Scale{Image: img, Scale: *scale}
+	}
+	if *rotate {
+		img = &imgutil.LeftRotate{Image: img}
+	}
+
+	// Open and initialize the printer.
+	p, err := ql.Open()
+	if err != nil {
+		log.Fatalln(err)
+	}
+	if p == nil {
+		log.Fatalln("no suitable printer found")
+	}
+	if err := p.Initialize(); err != nil {
+		log.Fatalln(err)
+	}
+	if err := p.UpdateStatus(); err != nil {
+		log.Fatalln(err)
+	}
+
+	// Check the picture against the media in the printer.
+	mi := ql.GetMediaInfo(
+		p.LastStatus.MediaWidthMM(),
+		p.LastStatus.MediaLengthMM(),
+	)
+	if mi == nil {
+		log.Fatalln("unknown media")
+	}
+
+	bounds := img.Bounds()
+	dx, dy := bounds.Dx(), bounds.Dy()
+	if dx > mi.PrintAreaPins {
+		log.Fatalln("the image is too wide,", dx, ">", mi.PrintAreaPins, "pt")
+	}
+	if dy > mi.PrintAreaLength && mi.PrintAreaLength != 0 {
+		log.Fatalln("the image is too high,", dy, ">", mi.PrintAreaLength, "pt")
+	}
+
+	if err := p.Print(img); err != nil {
+		log.Fatalln(err)
+	}
+}