Re: Flex Issue : AS3 FLEX MOBILE APP CRASHING WHEN SCALING IMAGE

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

Paul, did you end up making any progress on this? I'd love to know if there
was any improvement you could find.

On Tue, May 31, 2016 at 6:13 PM Clint M <cm...@gmail.com> wrote:

> Hmmm... if it just crashes you might be hitting the max bitmap data size of
> the operating system that the app is running on.
>
> "Starting with AIR 3 and Flash player 11, the size limits for a BitmapData
> object have been removed. The maximum size of a bitmap is now dependent on
> the operating system."
>
> http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/BitmapData.html
>
> On Tue, May 31, 2016 at 6:42 AM, Paul Moreau <pa...@zutec.com>
> wrote:
>
> > Thanks for the reply Clint but the crash happens while the user is
> zooming
> > on the image, so I cannot call the dispose function as the image needs to
> > remain onscreen while the user pan zooms.
> >
> > Paul
> >
> > On Thu, May 26, 2016 at 5:40 PM, Clint M <cm...@gmail.com> wrote:
> >
> > > My immediate reaction whenever I hear memory problems with images is
> > > somewhere some code is forgetting to call bitmapdata.dispose() before a
> > > bitmapdata object is discarded.
> > >
> > > In situations like this Adobe Scout is your friend.
> > > https://www.adobe.com/products/scout.html
> > > It let's your profile memory (and other things). Although I think you
> > need
> > > to compile it with Flash Builder 4.7 so you can use the advanced
> > telemetry
> > > compiler option.  Although I'm not sure that's required either to do
> > memory
> > > profiling.
> > >
> > > On Thu, May 26, 2016 at 9:14 AM, Paul Moreau <pa...@zutec.com>
> > > wrote:
> > >
> > > > Hi folks,
> > > >
> > > > Apologies if this is the wrong place to be posting this kind of
> thing,
> > > Ive
> > > > also posted on StackOverflow but thought I'd post here as I know
> there
> > > are
> > > > some Flex experts in this forum and haven't had huge feedback on
> > > > StackOverflow on Flex/AIR issues in the past.
> > > >
> > > > AS3 FLEX MOBILE APP CRASHING WHEN SCALING IMAGE
> > > >
> > > > *Problem:*
> > > >
> > > > Zooming in on image by scaling and moving using matrix causes the app
> > to
> > > > run out of memory and crash.
> > > >
> > > > *Additional Libraries used:*
> > > >
> > > > Gestouch - https://github.com/fljot/Gestouch
> > > >
> > > > *Description:*
> > > >
> > > > In my Flex Mobile app I have an Image inside a Group with pan/zoom
> > > enabled
> > > > using the Gestouch library. The zoom works to an extent but causes
> the
> > > app
> > > > to die (not freeze, just exit) with no error message after a certain
> > zoom
> > > > level.
> > > >
> > > > This would be managable except I can’t figure out how to implement a
> > > > threshold to stop the zoom at, as it crashes at a different zoom
> level
> > > > almost every time. I also use dynamic images so the source of the
> image
> > > > could be any size or resolution.
> > > >
> > > > They are usually JPEGS ranging from about 800x600 - 9000x6000.
> > > >
> > > > As of the AS3 docs there is no longer a limit to the size of the
> > > BitmapData
> > > > object so that shouldn't be the issue.
> > > >
> > > > “Starting with AIR 3 and Flash player 11, the size limits for a
> > > BitmapData
> > > > object have been removed. The maximum size of a bitmap is now
> dependent
> > > on
> > > > the operating system.”
> > > >
> > > > The crash mainly happens on iPad Mini and older Android devices.
> > > >
> > > >
> > > > *Things I have tried already tried:*
> > > >
> > > > Using Adobe Scout to pin point when the memory leak occurs.
> > > >
> > > > Debugging to find the exact height and width of the marker layer and
> > > image
> > > > at the time of crash.
> > > >
> > > > Setting a max zoom variable based on the size of the image.
> > > >
> > > > Cropping the image on zoom to only show the visible area. ( crashes
> on
> > > > copyPixels  function and BitmapData.draw() function )
> > > >
> > > > Using imagemagick to make lower quality images ( small images still
> > > crash )
> > > >
> > > > Using imagemagick to make  very low res image and make a grid of
> > smaller
> > > > images . Displaying in the mobile app using a List and Tile layout.
> > > >
> > > >
> > > > Any suggestions would be appreciated.
> > > >
> > > >
> > > > Thanks,
> > > >
> > > >
> > > > Paul
> > > >
> > > > --
> > > >
> > > >
> > > >
> > > >
> > > >
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