Bitmap Assets Question

hey everyone,
I've been developing an app for iPhone, and have been using the standard resolution as a base for my app.
Using bitmaps works perfect on Standard resolution. But when I port it over with High resolution settings, the iPhone 4 seems to be encountering some major lag issues, I suspect it's due to the double-pixelation to scale up the app to fit the iPhone 4's resolution.
I was wondering, would it be wise to create all my bitmap assets base on the iPhone 4's retina display and then scale it down? Or is there another way in handling the multiple screen support.
My theory is by creating my bitmap assets basing on Iphone's 640 x 960 resolution, when it comes to up-scaling, instead of double pixelation, iPhone 4 would instead stretch the image back to it's original size.
I had a read through http://www.adobe.com/devnet/air/articles/multiple-screen-sizes.html
But doesn't seem to be much of a help with interms of graphics usage.
Hopefully you guys can clear things up for this newbie here.
Thanks!

Hi,
I see no points you have to have a bitmap index on this column if you are having just one bitmap index for this table. Are other columns also a good candidate for bitmap index?
For such a small record 20,000 per year (Assuming size of each row is normal) and with four distinct values, I doubt you would gain any performance benefit between full table scan and bitmap scan.
Even with 20,000 rows and four distinct values and are populated at a same time you can create a b tree index on it such that the clustering factor is very low. Still it would not give much benefit.
And if most searches would be running against this table, I see it as a good candidate for keep bool in buffer cache.
Regards
Anurag

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ChaosAD wrote:
I have a star schema database setup with a bunch of definition tables with 2-10 values in each. Most things I read say to use bitmap only in data warehousing, but in the same breath talk about tables exactly like I have them set up. So my question is, do bitmap indexes ever have a use outside of data warehouse? We don't do millions of transactions on hr, but it is an asset management front end run using php. So the main data tables is getting updated, inserted, and deleted during the day. I'd say on average we have about 30 users at any given time performing actions on the tables or pulling reports.
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1 Centre Street, Suite 204 (781) 665-0053
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In article <f2chss$g92$[email protected]>,
"Rothrock" <[email protected]> wrote:
> I'm seeing it in some of my projects as well. I seem to
recall that when
> previous versions of Flash came out there was a similar
problem and then it
> went away quietly. Of course I could just be losing my
mind?
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nor that
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> I'm not even drawing the BitmapData to screen ? this is
using CS3,
> publishing for Flash 8 and AS2, but played back in the 9
player.
I'm not even using a BitmapData; I'm just moving a Bitmap
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posted a
report on the Adobe Feature Request/Bug Report form at
<
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Suitable Systems
http://www.suitable.com/
1 Centre Street, Suite 204 (781) 665-0053
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Hello,
I'm creating my first mobile air app, to start with it's going to be on ios then I hope to launch on Android and other platforms. I'm wondering is it a good idea to load my bitmap assets during runtime as and when I need them or is it advised to load them all at once upfront and store in memory?
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Thanks is advance!

If your object pooling (creating assets up from before game play), I don't think there is any performance gain from embedding or loading a bitmap from an external source, with the exception of file size if your loading tons of bitmaps and dont want to package them with the application. I could be wrong though!!!
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Depending on what your doing, you may want to load your bitmaps first to store in memory (create a pool)... if they are going to be used soon enough that is.
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Message was edited by: boat5 // spelling

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In my experience, the second solution here: actionscript 3 - Bitmaps Being Cached As Bitmaps - Stack Overflow is the one that gave me best results thus far, even when loading a swf (as opposed to a bitmap) which contains bitmaps inside. To avoid this decompressing on the run (on demand) you can instead request flash to decompress it on load. This will increase the load time but improve the perceived performance of the app since a separate thread takes care of the decompressing. This of course means no jitter or skip when the image hits the screen:
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Embedded images (via code) are not supposed to be compressed, so this problem shouldn't occur with applications that do so. However, if you are like me, and you use the Flash Pro IDE to import PNGs or other bitmap assets, Flash Pro compresses them as JPG by default, using the setting provided by the image itself.
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In my experience the frame rate average dropped only by one frame per second, but it's much more consistent without any skips or lags which is essential for games.
See: http://help.adobe.com/en_US/as3/dev/WS52621785137562065a8e668112d98c8c4df-8000.html
And
http://www.bytearray.org/?p=2931

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But -target-player=25 didn't have any effect either.
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Have I missed a secret setting somewhere?
How can I tell the AIR runtime to simply run as pixel-dense as possible? When the workarounds listed below are performed, my app looks fantastic on high-density displays. But its the pixel scaling that is making everything look bad, and I desperately want to get this fixed.
Workarounds?
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Any other workaround ideas are appreciated too.
Cheers,
Doug

It took me a while to figure out (without much help from Adobe, grrr!), since some internet writeups were terse and implied somehow that AIR's Retina support (setting your app descriptor's <initialWindow/requestedDisplayResolution> to high) would also work on Windows. They don't.
On OSX, the steps to disable pixel-doubling are:
update your app descriptor to AIR 14
set initialWindow/requestedDisplayResolution = high
compile with SWF version 25 or greater
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On Windows, the pixel-doubling kicks in when you have a HiDPI scaling set to about 150% or greater (hiDPI scaling was introduced in Win7). There is no way to detect from within an AIR app when Windows is doing its HiDPI scaling. stage.contentsScaleFactor is always 1, under all configurations.
The only thing you can do for AIR apps on Windows is explicitly disable display scaling (like you have done) and update your app to manually scale all UI elements at runtime (that's really gross and hard, and it what I working on right now).
For my app, I updated our Windows installer to set the registry to disable hiDPI scaling, for all users, just for our app. Here's how you do that:
Key = HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
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If you only want to change the setting for the current user (not all users), the KEY root is HKEY_CURRENT_USER instead of HKEY_LOCAL_MACHINE.
If you don't have an explicit installer for your AIR app (ie. if you are deploying from the web via a badge installer), then you're even more messed up, and you will need to tell your users to disable the scaling manually.
I know, it's a total pain. I hope this helps.
Cheers,
Doug
PS: Adobe devs, if you are listening ...

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