Text Alignment using Adafruit GFX fonts off by a few pixels.

[Pconti31]

As you know I've been porting Adafruit's Font code to Java for the Builder and also porting your alignment code.
Having completed the port for reading and writing these fonts I found what I think is a small bug within the GUIslice API gslc_DrawTxtBase() routine.

I have attached a small sample program that shows the alignment that I believe is incorrect. I have tried this program with various GFX fonts and sizes and they all behave the same.

I think the problem is within gslc_DrawTxtBase() routine line number 2982:

    nTxtX += nTxtOffsetX;

If you modify this to

    nTxtX -= nTxtOffsetX;

I believe you will find the text lining up correctly. Note that these nTxtOffsets are only used by GFX fonts. The glcd built-in fonts set these offsets to zeroes.

Paul--
test-align.zip

[ImpulseAdventure]

Thank you very much Paul for reporting this and supplying an example to demonstrate the behavior.

I have now merged the proposed fix.
thx