Initial commit
This commit is contained in:
402
label-exp/main.go
Normal file
402
label-exp/main.go
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@@ -0,0 +1,402 @@
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package main
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import (
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"errors"
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"html/template"
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"image"
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"image/color"
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"image/draw"
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"image/png"
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"io"
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"log"
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"net/http"
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"os"
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"strconv"
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"time"
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"github.com/boombuler/barcode"
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"github.com/boombuler/barcode/qr"
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"janouch.name/sklad/bdf"
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)
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// scaler is a scaling image.Image wrapper.
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type scaler struct {
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image image.Image
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scale int
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}
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// ColorModel implements image.Image.
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func (s *scaler) ColorModel() color.Model {
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return s.image.ColorModel()
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}
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// Bounds implements image.Image.
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func (s *scaler) Bounds() image.Rectangle {
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r := s.image.Bounds()
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return image.Rect(r.Min.X*s.scale, r.Min.Y*s.scale,
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r.Max.X*s.scale, r.Max.Y*s.scale)
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}
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// At implements image.Image.
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func (s *scaler) At(x, y int) color.Color {
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if x < 0 {
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x = x - s.scale + 1
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}
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if y < 0 {
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y = y - s.scale + 1
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}
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return s.image.At(x/s.scale, y/s.scale)
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}
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// -----------------------------------------------------------------------------
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func decodeBitfieldErrors(b byte, errors [8]string) []string {
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var result []string
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for i := uint(0); i < 8; i++ {
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if b&(1<<i) != 0 {
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result = append(result, errors[i])
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}
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}
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return result
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}
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func printStatusInformation(d []byte) {
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log.Println("-- status")
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// Error information 1.
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for _, e := range decodeBitfieldErrors(d[8], [8]string{
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"no media", "end of media", "cutter jam", "?", "printer in use",
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"printer turned off", "high-voltage adapter", "fan motor error"}) {
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log.Println("error:", e)
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}
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// Error information 2.
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for _, e := range decodeBitfieldErrors(d[9], [8]string{
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"replace media", "expansion buffer full", "communication error",
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"communication buffer full", "cover open", "cancel key",
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"media cannot be fed", "system error"}) {
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log.Println("error:", e)
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}
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// Media width.
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log.Println("media width:", d[10], "mm")
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// Media type.
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switch b := d[11]; b {
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case 0x00:
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log.Println("media: no media")
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case 0x4a:
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log.Println("media: continuous length tape")
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case 0x4b:
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log.Println("media: die-cut labels")
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default:
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log.Println("media:", b)
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}
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// Mode.
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log.Println("mode:", d[15])
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// Media length.
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log.Println("media width:", d[17], "mm")
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// Status type.
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switch b := d[18]; b {
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case 0x00:
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log.Println("status type: reply to status request")
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case 0x01:
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log.Println("status type: printing completed")
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case 0x02:
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log.Println("status type: error occurred")
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case 0x04:
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log.Println("status type: turned off")
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case 0x05:
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log.Println("status type: notification")
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case 0x06:
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log.Println("status type: phase change")
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default:
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log.Println("status type:", b)
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}
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// Phase type.
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switch b := d[19]; b {
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case 0x00:
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log.Println("phase state: receiving state")
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case 0x01:
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log.Println("phase state: printing state")
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default:
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log.Println("phase state:", b)
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}
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// Phase number.
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log.Println("phase number:", int(d[20])*256+int(d[21]))
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// Notification number.
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switch b := d[22]; b {
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case 0x00:
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log.Println("notification number: not available")
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case 0x03:
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log.Println("notification number: cooling (started)")
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case 0x04:
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log.Println("notification number: cooling (finished)")
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default:
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log.Println("notification number:", b)
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}
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}
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// genLabelData converts an image to the printer's raster format.
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func genLabelData(src image.Image, offset int) (data []byte) {
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// TODO: Margins? For 29mm, it's 6 pins from the start, 306 printing pins.
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bounds := src.Bounds()
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pixels := make([]bool, 720)
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for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
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off := offset
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for x := bounds.Max.X - 1; x >= bounds.Min.X; x-- {
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// TODO: Anything to do with the ColorModel?
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r, g, b, a := src.At(x, y).RGBA()
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pixels[off] = r == 0 && g == 0 && b == 0 && a != 0
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off++
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}
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data = append(data, 'g', 0x00, 90)
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for i := 0; i < 90; i++ {
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var b byte
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for j := 0; j < 8; j++ {
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b <<= 1
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if pixels[i*8+j] {
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b |= 1
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}
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}
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data = append(data, b)
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}
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}
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return
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}
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func printLabel(src image.Image) error {
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data := []byte(nil)
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// Raster mode.
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// Should be the only supported mode for QL-800.
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data = append(data, 0x1b, 0x69, 0x61, 0x01)
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// Automatic status mode (though it's the default).
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data = append(data, 0x1b, 0x69, 0x21, 0x00)
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// Print information command.
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dy := src.Bounds().Dy()
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data = append(data, 0x1b, 0x69, 0x7a, 0x02|0x04|0x40|0x80, 0x0a, 29, 0,
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byte(dy), byte(dy>>8), byte(dy>>16), byte(dy>>24), 0, 0x00)
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// Auto cut, each 1 label.
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data = append(data, 0x1b, 0x69, 0x4d, 0x40)
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data = append(data, 0x1b, 0x69, 0x41, 0x01)
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// Cut at end (though it's the default).
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// Not sure what it means, doesn't seem to have any effect to turn it off.
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data = append(data, 0x1b, 0x69, 0x4b, 0x08)
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// 3mm margins along the direction of feed. 0x23 = 35 dots, the minimum.
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data = append(data, 0x1b, 0x69, 0x64, 0x23, 0x00)
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// Compression mode: no compression.
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// Should be the only supported mode for QL-800.
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data = append(data, 0x4d, 0x00)
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// The graphics data itself.
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data = append(data, genLabelData(src, 6)...)
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// Print command with feeding.
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data = append(data, 0x1a)
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// ---
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// Linux usblp module, located in /drivers/usb/class/usblp.c
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// (at least that's where the trails go, I don't understand the code)
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f, err := os.OpenFile("/dev/usb/lp0", os.O_RDWR, 0)
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if err != nil {
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return err
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}
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defer f.Close()
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// Flush any former responses in the printer's queue.
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for {
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dummy := make([]byte, 32)
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if _, err := f.Read(dummy); err == io.EOF {
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break
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}
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}
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// Clear the print buffer.
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invalidate := make([]byte, 400)
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if _, err := f.Write(invalidate); err != nil {
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return err
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}
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// Initialize.
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if _, err := f.WriteString("\x1b\x40"); err != nil {
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return err
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}
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// Request status information.
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if _, err := f.WriteString("\x1b\x69\x53"); err != nil {
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return err
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}
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// We need to poll the device.
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status := make([]byte, 32)
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for {
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if n, err := f.Read(status); err == io.EOF {
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time.Sleep(10 * time.Millisecond)
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} else if err != nil {
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return err
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} else if n < 32 {
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return errors.New("invalid read")
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} else {
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break
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}
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}
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printStatusInformation(status)
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// Print the prepared data.
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if _, err := f.Write(data); err != nil {
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return err
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}
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// TODO: We specifically need to wait for a transition to the receiving
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// state, and try to figure out something from the statuses.
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// We may also receive an error status instead of the transition to
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// the printing state. Or even after it.
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start := time.Now()
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for {
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if time.Now().Sub(start) > 3*time.Second {
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break
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}
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if n, err := f.Read(status); err == io.EOF {
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time.Sleep(100 * time.Millisecond)
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} else if err != nil {
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return err
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} else if n < 32 {
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return errors.New("invalid read")
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} else {
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printStatusInformation(status)
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}
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}
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return nil
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}
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// -----------------------------------------------------------------------------
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var font *bdf.Font
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// TODO: By rotating the label we can make it smaller, as an alternate mode.
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func genLabel(text string, width int) image.Image {
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// Create a scaled bitmap of the QR code.
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qrImg, _ := qr.Encode(text, qr.H, qr.Auto)
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qrImg, _ = barcode.Scale(qrImg, 306, 306)
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qrRect := qrImg.Bounds()
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// Create a scaled bitmap of the text label.
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textRect, _ := font.BoundString(text)
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textImg := image.NewRGBA(textRect)
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draw.Draw(textImg, textRect, image.White, image.ZP, draw.Src)
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font.DrawString(textImg, image.ZP, text)
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// TODO: We can scale as needed to make the text fit.
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scaledTextImg := scaler{image: textImg, scale: 3}
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scaledTextRect := scaledTextImg.Bounds()
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// Combine.
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combinedRect := qrRect
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combinedRect.Max.Y += scaledTextRect.Dy() + 20
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combinedImg := image.NewRGBA(combinedRect)
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draw.Draw(combinedImg, combinedRect, image.White, image.ZP, draw.Src)
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draw.Draw(combinedImg, combinedRect, qrImg, image.ZP, draw.Src)
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target := image.Rect(
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(width-scaledTextRect.Dx())/2, qrRect.Dy()+10,
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combinedRect.Max.X, combinedRect.Max.Y)
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draw.Draw(combinedImg, target, &scaledTextImg, scaledTextRect.Min, draw.Src)
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return combinedImg
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}
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var tmpl = template.Must(template.New("form").Parse(`
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<!DOCTYPE html>
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<html><body>
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<table><tr>
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<td valign=top>
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<img border=1 src='?img&width={{.Width}}&text={{.Text}}'>
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</td>
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<td valign=top>
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<form><fieldset>
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<p><label for=width>Tape width in pt:</label>
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<input id=width name=width value='{{.Width}}'>
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<p><label for=text>Text:</label>
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<input id=text name=text value='{{.Text}}'>
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<p><input type=submit value='Update'>
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<input type=checkbox id=print name=print>
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<label for=print>Print label</label>
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</fieldset></form>
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</td>
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</tr></table>
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</body></html>
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`))
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func handle(w http.ResponseWriter, r *http.Request) {
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if err := r.ParseForm(); err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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var params = struct {
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Width int
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Text string
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}{
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Text: r.FormValue("text"),
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}
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var err error
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params.Width, err = strconv.Atoi(r.FormValue("width"))
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if err != nil {
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params.Width = 306 // Default to 29mm tape.
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}
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label := genLabel(params.Text, params.Width)
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if r.FormValue("print") != "" {
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if err := printLabel(label); err != nil {
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log.Println("print error:", err)
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}
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}
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if _, ok := r.Form["img"]; !ok {
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w.Header().Set("Content-Type", "text/html")
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tmpl.Execute(w, ¶ms)
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return
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}
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w.Header().Set("Content-Type", "image/png")
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if err := png.Encode(w, label); err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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}
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func main() {
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var err error
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fi, err := os.Open("../../ucs-fonts-75dpi100dpi/100dpi/luBS24.bdf")
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if err != nil {
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log.Fatalln(err)
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}
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font, err = bdf.NewFromBDF(fi)
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if err != nil {
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log.Fatalln(err)
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}
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if err := fi.Close(); err != nil {
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log.Fatalln(err)
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}
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log.Println("Starting server")
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http.HandleFunc("/", handle)
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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Reference in New Issue
Block a user