FTL (e.g. TextBlock) source code

[Mihai Chira <mi...@gmail.com>]

Hi,


I found a (really complicated) way to reproduce a bug in Label.as (the one
that caused FLEX-33747 <https://issues.apache.org/jira/browse/FLEX-33747>),
and as I'm trying to discover its cause I find myself stuck seeing
different behaviours of TextBlock.recreateTextLine(). When it's buggy it
returns a TextLine (and then 9 more after that, in the same loop), while in
the bug-free scenario it returns null.

(How) Can I access the source code of that function? How about the rest of
TLF? It will help me produce a bug report, as I need to find a way to
isolate those conditions. It would be great to have it in for the 4.11
release.


Many thanks,
Mihai

Re: FTL (e.g. TextBlock) source code

[Mihai Chira <mi...@gmail.com>]

Thanks, Alex.

In the meantime I did find a way to reproduce that
mandelbug<http://en.wikipedia.org/wiki/Unusual_software_bug>,
and I've described it here<https://issues.apache.org/jira/browse/FLEX-33779> on
the Apache Flex Jira. It's a hell of a bug in terms of necessary
prerequisites. If I could see the source of TextBlock or if I were a font
expert I could probably go further with the investigation, but that's where
I had to leave it.

I hope some of you have ideas around it. If it is, indeed, related to code
in TextBlock, then it might even be a Flash Player issue. Or it could
simply be a badly formed ttf file (though I did download the same ttf from
multiple sources, but you never know). Whatever it is, I am very curious.


On 24 September 2013 17:44, Alex Harui <ah...@adobe.com> wrote:

>
>
> On 9/24/13 8:39 AM, "Mihai Chira" <mi...@gmail.com> wrote:
>
> >Hi,
> >
> >
> >I found a (really complicated) way to reproduce a bug in Label.as (the one
> >that caused FLEX-33747
> ><https://issues.apache.org/jira/browse/FLEX-33747>),
> >and as I'm trying to discover its cause I find myself stuck seeing
> >different behaviours of TextBlock.recreateTextLine(). When it's buggy it
> >returns a TextLine (and then 9 more after that, in the same loop), while
> >in
> >the bug-free scenario it returns null.
> >
> >(How) Can I access the source code of that function? How about the rest of
> >TLF? It will help me produce a bug report, as I need to find a way to
> >isolate those conditions. It would be great to have it in for the 4.11
> >release.
> TLF is in Apache Flex Git in the flex-tlf repo.
>
> TextBlock and other flash.text.engine classes are part of the Adobe
> runtimes.  They are written in C++ and the source is not available.
>
> In my limited experience with TLF, TextBlock.recreateTextLine gets
> involved when the compose width and/or TextElement changes.  So it is
> usually other code that is causing TextBlock to do different things.
>
> -Alex
>
>

Re: FTL (e.g. TextBlock) source code

[Alex Harui <ah...@adobe.com>]

On 9/24/13 8:39 AM, "Mihai Chira" <mi...@gmail.com> wrote:

>Hi,
>
>
>I found a (really complicated) way to reproduce a bug in Label.as (the one
>that caused FLEX-33747
><https://issues.apache.org/jira/browse/FLEX-33747>),
>and as I'm trying to discover its cause I find myself stuck seeing
>different behaviours of TextBlock.recreateTextLine(). When it's buggy it
>returns a TextLine (and then 9 more after that, in the same loop), while
>in
>the bug-free scenario it returns null.
>
>(How) Can I access the source code of that function? How about the rest of
>TLF? It will help me produce a bug report, as I need to find a way to
>isolate those conditions. It would be great to have it in for the 4.11
>release.
TLF is in Apache Flex Git in the flex-tlf repo.

TextBlock and other flash.text.engine classes are part of the Adobe
runtimes.  They are written in C++ and the source is not available.

In my limited experience with TLF, TextBlock.recreateTextLine gets
involved when the compose width and/or TextElement changes.  So it is
usually other code that is causing TextBlock to do different things.

-Alex