ImageEn Forum - m_segmentbuffer in iexVirtaulbitmaps is always NIL

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m_segmentbuffer in iexVirtaulbitmaps is always NIL

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harry stahl

Germany
62 Posts

Posted - Dec 21 2021 : 13:29:40

While your photosphere demo is working fine, I have problems to take it over in my application.

THere is an ImagenEnView (iView), that displays images (legay bitmap is used).

Now there is a 360% image, that I want to display. User can press a button to activate this. In onclick-Event I do the following:

iProvider.IO.LoadFromFile (fn);
iProvider.Update;

iview.IEBitmap.VirtualBitmapProvider := TIEEquirectangularRenderer.Create(iProvider);
iView.Update;

In the mousemoveEvent is your source. But app crashes, in unit iexVirtualbitmaps, in func "TIEEquirectangularRenderer.GetSegment", because m_segmentBuffer is NIL.

Is there a special setting neccessary, that this works also in my app?

edit: if I copy your template and use this, it works. But I create and use all my ImageEnview in this unit at runtime, so what special settings I have to set here?

HS

xequte

38611 Posts

Posted - Dec 21 2021 : 22:46:32

Hi Harry

Actually, it looks like GetSegment is not properly initialized (because it is not used by default).

Can you try changing iexVirtualBitmaps.pas as follows:


function TIEEquirectangularRenderer.GetSegment(Container: TIEBitmap; Row: integer; Col: integer; Width: integer): pointer;
...
begin
  if not assigned( m_segmentBuffer ) then
    m_segmentBuffer := TIEBitmap.Create();
  if (m_segmentBuffer.Width <> Width) or (m_segmentBuffer.Height <> 1) then
    m_segmentBuffer.Allocate(Width, 1);
...
end;

Nigel
Xequte Software
www.imageen.com

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