Adapting to Retina/HiDPI

General
1

I never had to deal with Retina or HiDPI (sic), but now I guess I have to.

I have lots of graphics, all PNG. Some naturally have Alpha channels, some don’t. I 99.99% of the time have two graphics for every one; e.g. mypic and mypic_mask. But mypic may have a Alpha channel anyway. And mypic always has Transparant=White.

So once I turn on Enable Hi-DPI, when I start my app I get lots of UnsupportedOperation Exception errors, “The Transparent property cannot be used with Pictures with alpha channels”, and this is simply caused by referencing the object.

I found I can either get rid of this by setting Transparant=None on all these pictures or perhaps I can get rid of all the Alpha channels on the offending picture files.

What is the best way of dealing with this?

2

Images with embedded alpha channel is the current standard.

1 Like
3

So the suggestion would be to:

  1. Take all my [mypic, mypic_mask] pairs and make a single mypic with the _mask as the embedded alpha channel
  2. Remove the _mask graphics, as they are now never used
  3. Change all the Transparent properties of the mypic’s to =NONE.

(I should say that I had all these mypic/mypic_mask pairs because of how REAL/Xojo worked in the past.)

Do I have that correct?

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4

Me, I’ve rmvd all the _mask graphics, plus had to re-create the picts with embedded transparency.

Remember to do a right-click onto a graphics object, then select “Convert to Image Set” to get the Retina capability.