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ESC/Label: SpeedUp through less delete operations (Z#23124315) #77

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merged 1 commit into from Mar 4, 2024
Merged

ESC/Label: SpeedUp through less delete operations (Z#23124315) #77

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21 changes: 14 additions & 7 deletions pretixprint/app/src/main/java/eu/pretix/pretixprint/byteprotocols/ESCLabel.kt
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Expand Up @@ -11,6 +11,7 @@ import java8.util.concurrent.CompletableFuture
import java.io.ByteArrayOutputStream
import java.io.InputStream
import java.io.OutputStream
import java.util.UUID
import java.util.concurrent.TimeUnit


Expand Down Expand Up @@ -48,25 +49,31 @@ class ESCLabel : StreamByteProtocol<Bitmap> {
//
// Command notes:
// ~DY: Store file to printer memory
// Contrary to the documentation, the file name should also contain the extension

// Delete all files volatile memory
ostream.write("^XA^IDR:*.*^FS^XZ".toByteArray())
// Contrary to the documentation, the file name should also contain the extension.
// Diverging from the sample in the documentation, we are also naming each file
// explicitly, so that we can delete it rather than issue a "delete everything" command
// ~ID: Delete file or files from printer memory
// As confirmed by Ivar, the delete operations take for bloody ever and slow down the
// printer a lot. As such, we diverge from the official documentation/sample and only
// delete the printed file at the end of the job. Should too many prints fail and clog
// up the volatile memory, the user will have manually clear the memory from the
// printer's menu.

// Register image in printer in volatile memory as a PNG
val stream = ByteArrayOutputStream()
img.compress(Bitmap.CompressFormat.PNG, 100, stream)
ostream.write("~DYR:IMAGE.PNG,B,P,${stream.size()},0,".toByteArray())
val filename = UUID.randomUUID().toString().replace("-", "").take(8).uppercase()
ostream.write("~DYR:${filename}.PNG,B,P,${stream.size()},0,".toByteArray())
stream.writeTo(ostream)
img.recycle()

// Create label and print previously transferred image
ostream.write("^XA".toByteArray())
ostream.write("^ILR:IMAGE.PNG^FS".toByteArray())
ostream.write("^ILR:${filename}.PNG^FS".toByteArray())
ostream.write("^XZ".toByteArray())

// Delete the image from the printer again
ostream.write("^XA^IDR:*.*^FS^XZ".toByteArray())
ostream.write("^XA^IDR:${filename}.PNG^FS^XZ".toByteArray())

ostream.flush()
return ostream.toByteArray()
Expand Down