[mono-android] Larger memory footprint when using BitmapFactory.DecodeFile in C# (and huge memory for tiny image)

[Matthew Leibowitz]

Hi all,


I just want to see if anyone else has noticed that when loading images into
memory, the exact same C# code uses more memory to hold the images (~1.5x
the amount in Java).

This Java code results in a total memory size of *105.5 MB*:

Bitmap[] bitmaps = new Bitmap[100];

for (int i = 0; i < 100; i++)
{
    String root =
Environment.getExternalStorageDirectory().getAbsolutePath();
    String imagePath = "/evolution/threesixty/216/Edaphosaurus_001.jpg";

    bitmaps[i] = BitmapFactory.decodeFile(root + imagePath);
}

This C# code results in *148.1 MB*:

Bitmap[] bitmaps = new Bitmap[100];
 for (int i = 0; i < 100; i++)
{
    string root = Environment.ExternalStorageDirectory.AbsolutePath;
    string imagePath = "/evolution/threesixty/216/Edaphosaurus_001.jpg";

    bitmaps[i] = BitmapFactory.DecodeFile(root + imagePath);
}

Does anyone have any ideas as to why? I understand that the .NET wrappers
may use a little more to hold extra binding data or things, but surely not
that much?

Also, as a side question:
Each image is only *60 KB** *on disk, why is the in-memory version *1 MB*?
I know that my loading method does not do any sampling/density checking,
but that was not the aim. Surely loading a <100KB image should not exceed
100KB memory space?


Regards,
Matthew
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