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Fixed printing when image is too short

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This commit is contained in:
Ignacio Rivero 2025-06-22 00:51:15 -03:00
parent 452c70401e
commit 0ef02331b4
1 changed files with 15 additions and 7 deletions
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22
main.go
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@ -25,6 +25,8 @@ import (
dither "github.com/makeworld-the-better-one/dither" dither "github.com/makeworld-the-better-one/dither"
) )
const minLines = 86 // firmware refuses to print anything shorter
var ( var (
mainServiceUUID = ble.MustParse("ae30") mainServiceUUID = ble.MustParse("ae30")
printCharacteristic = ble.MustParse("ae01") printCharacteristic = ble.MustParse("ae01")
@ -39,13 +41,6 @@ var (
ditherType = flag.String("dither", "none", "Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn") ditherType = flag.String("dither", "none", "Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn")
) )
func min(a, b int) int {
if a < b {
return a
}
return b
}
func dumpCharacteristics(client ble.Client, svc *ble.Service) { func dumpCharacteristics(client ble.Client, svc *ble.Service) {
chars, err := client.DiscoverCharacteristics(nil, svc) chars, err := client.DiscoverCharacteristics(nil, svc)
if err != nil { if err != nil {
@ -269,6 +264,18 @@ func sendImageBufferToPrinter(client ble.Client, dataChr, printChr *ble.Characte
return nil return nil
} }
func padImageToMinLines(img image.Image, minLines int) image.Image {
bounds := img.Bounds()
if bounds.Dy() >= minLines {
return img
}
// Create a new white image
dst := imaging.New(bounds.Dx(), minLines, color.White)
// Paste the original image at the top
dst = imaging.Paste(dst, img, image.Pt(0, 0))
return dst
}
func main() { func main() {
flag.Parse() flag.Parse()
if flag.NArg() < 1 { if flag.NArg() < 1 {
@ -302,6 +309,7 @@ func main() {
if err != nil { if err != nil {
log.Fatalf("Image load error: %v", err) log.Fatalf("Image load error: %v", err)
} }
img = padImageToMinLines(img, minLines)
var pixels []byte var pixels []byte
var height int var height int