GB use more memory for Bitmap object?? (more than froyo)

[Neo]

I found that gb use more memory than froyo.
When we make Bitmap object, image buffer is located in native heap.
Decoder in skia library is using malloc.(for jpeg, bimap or png )
But, the size is reported to vm. So, It could influence total vm oject
creation.
In worst case, many Bitmap object could cause a out of memory
exception.

I am using same apk, but total size of native heap is different.
GB use about 30% more memory than froyo.
So, I am facing OOM exception more frequently.

I guess it is result of Bitmap change in android source
code(BitmapFactory.java).
Default loading option could influence the native heap size?

If my guessing is reasonable,
It could cause a problem when i change default option from ARGB_8888
to RGB_565?
If there is no issue, I'd like to change the default config for
Bitmap.

from Froyo (BitmapFactory.java)
public Bitmap.Config inPreferredConfig;

to GB (BitmapFactory.java)
public Bitmap.Config inPreferredConfig = Bitmap.Config.ARGB_8888;

[Romain Guy]

Gingerbread uses ARGB_8888 by default but do *not* change it. Apps
will now expect this format starting with 2.3 and this would be an
incompatible change.

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[Neo]

If apps are expect ARGB_888 by default in Gingerbread,
Is there any backward compatibility for applications developed under
2.2.
Previous application would expect RGB_565.

If this change of default option could cause a lack of memory.
Such a change is so irresponsible.

[Romain Guy]

That's why we also increased the maximum heap size in Gingerbread.