LB Booster - Blitting blank screen.

LB Booster

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Compatibility with LB4 (Moderator: Richard Russell)

Blitting blank screen.

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Topic: Blitting blank screen. (Read 814 times)

Richard Russell
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Re: Blitting blank screen.
« Reply #3 on: Mar 6^th, 2014, 08:21am »

on Mar 5^th, 2014, 9:53pm, Richard Russell wrote:

The most straightforward workaround is to forcibly bring #1.gb in front of #1.sk

Here's a simpler workaround: just reverse the order of the STYLEBITS commands:

Code:

    stylebits #1.gb, 0, _WS_BORDER, 0, 0
    stylebits #1.sk, 0, _WS_BORDER, 0, 0

The order of the STYLEBITS commands shouldn't be significant, so this seems to be a bug in LBB. I will investigate.

Richard.

« Last Edit: Mar 6^th, 2014, 11:04am by Richard Russell »

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Richard Russell
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Posts: 1348

Re: Blitting blank screen.
« Reply #4 on: Mar 6^th, 2014, 4:13pm »

on Mar 6^th, 2014, 08:21am, Richard Russell wrote:

this seems to be a bug in LBB. I will investigate.

I can confirm it was a bug, although an extremely obscure one. I have uploaded a fixed version of LBB (2.51) to the usual place:

http://lbbooster.com/LBB.exe
http://lbbooster.com/LBBRUN.exe

You were very unlucky to encounter this bug. It only had an effect if all the following conditions were met:

You create two controls whose Z-order matters (which is usually the case only if they overlap).
Both controls have STYLEBITS statements.
The STYLEBITS statements appear before the statements which create the controls.
The order in which the STYLEBITS statements appear in the program is different from the order in which the controls themselves are created.

Your betty.bas meets those conditions, but it's not very surprising that the bug - which has been present in all versions of LBB to date - has never been spotted previously!

Richard.

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