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 Maximum IEBitmap Size		  New Topic  Reply to Topic
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w2m

USA
1990 Posts
Posted - Jul 14 2013 :  09:12:49  Show Profile  Reply
I am drawing thumbnails to very large IEBitmaps and occasionally the drawing fails because the bitmap is too large. Is there a way to estimate the maximum size of a TIEBitmap so I can trap this kind of error?


William Miller

fab

1310 Posts
Posted - Jul 17 2013 :  12:52:37  Show Profile  Reply
How do you draw the thumbnails? If you use TCanvas (or TIECanvas) the limitation is the same of a TBitmap.
Otherwise the limitation is related to the allocable memory (see the other "2GB" topic).
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w2m

USA
1990 Posts
Posted - Jul 17 2013 :  15:48:56  Show Profile  Reply
Are you saying that when drawing on large IEBitmaps it is better to use 
iIEBitmap.RenderToTIEBitmapEx(Form1.ImageEnView1.IEBitmap, x, y, iMaxX, iMaxY, 0, 0, iMaxX, iMaxY, 255, rfNone);
rather than
iIEBitmap.DrawToCanvas(Form1.ImageEnView1.Bitmap.Canvas, x, y);
?

Does it do any good to use {$SetPEFlags IMAGE_FILE_LARGE_ADDRESS_AWARE}
to provide up to a maximum of 4 GB memory in 32-Bit application?

William Miller
Adirondack Software & Graphics
Email: w2m@frontiernet.net
EBook: http://www.imageen.com/ebook/
Apprehend: http://www.frontiernet.net/~w2m/index.html
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fab

1310 Posts
Posted - Jul 18 2013 :  14:07:03  Show Profile  Reply
Yes, it is better to use TIEBitmap.RenderToTIEBitmapEx. It doesn't require a canvas doing the job directly inside the buffers.

It is good to use {$SetPEFlags IMAGE_FILE_LARGE_ADDRESS_AWARE}, of course, otherwise there is still the 2GB limitation.
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