Hello everyone,
I have an app that captures a user's signature from a Panel used as a canvas and saves it to a PNG file:
I then print that image with the EscPOSPRINTER class together with other content in a 40‑column report.
On B4A 12.80 everything works as expected. After updating to 13.40, it looks like the image transparency is lost: the printout shows solid/filled rectangles instead of the signature over a transparent background.
This seems to be related to how the image is saved. If I capture and save the signature using an APK compiled with 12.80, then update the app to the exact same code compiled with 13.40, the printout remains correct (no dark rectangles, transparency preserved). If I capture and save the signature with the 13.40 build, I get the dark smudges.
Any ideas ?
I have an app that captures a user's signature from a Panel used as a canvas and saves it to a PNG file:
Save Signature code:
Sub Save(SD As SignatureData, Dir As String, Name As String)
Dim out As OutputStream
out = File.OpenOutput(Dir, Name, False)
SD.Canvas.Bitmap.WriteToStream(out, 100, "PNG")
out.Close
End SubI then print that image with the EscPOSPRINTER class together with other content in a 40‑column report.
On B4A 12.80 everything works as expected. After updating to 13.40, it looks like the image transparency is lost: the printout shows solid/filled rectangles instead of the signature over a transparent background.
This seems to be related to how the image is saved. If I capture and save the signature using an APK compiled with 12.80, then update the app to the exact same code compiled with 13.40, the printout remains correct (no dark rectangles, transparency preserved). If I capture and save the signature with the 13.40 build, I get the dark smudges.
Any ideas ?
