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Patrick Quinn
United Kingdom
81 Posts |
 Posted - Aug 21 2011 : 15:42:26
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To show images full-screen in my viewer program, I use a borderless maximised form with an ImageENView aligned to alClient.
The user can cycle through full screen images of the main form ImageEnMview thumbnails, using the keyboard, with a transition at each image change.
This works very well - the transitions looks great - but on large images there is a noticeable lag between pressing the keyboard and the ImageEnView starting the transition, as it has to load the image from disk.
To get rid of this lag, I have tried using two TIEBitmaps (both with a TImageEnIO attached), and pre-loading the previous and next images into these.
I then then use:
ImageEnView.PrepareTransition
ImageEnView.IEBitmap.AssignImage(My TIEBitmap)
ImageEnView.RunTransition(xxx, xxx).
This gets rid of the time lag, but introduces a new problem - the ImageEnView doesn't autofit the image until the transition has finished, causing the image to jerk as it resizes when the transition finishes.
I guess assigning the new image to the ImageEnView.IEBitmap is wrong?
Is there a correct way of pre-loading an image then using transitions?
I hope I've explained this ok.
regards
Patrick |
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fab
1310 Posts |
Posted - Aug 21 2011 : 22:48:25
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Hello,
call Update() just after AssignImage:
ImageEnView.PrepareTransition();
ImageEnView.IEBitmap.AssignImage(My TIEBitmap);
ImageEnView.Update(); <----
ImageEnView.RunTransition(xxx, xxx); |
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Patrick Quinn
United Kingdom
81 Posts |
Posted - Aug 22 2011 : 01:33:11
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fabrizio
Thank you very much for your very quick reply.
Yes, that works!
(I should have thought of trying Update, but am still learning ImageEn. The more I learn, the more I realise how powerful ImageEn is. There is a lot to learn, though...)
regards
Patrick |
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fab
1310 Posts |
Posted - Aug 22 2011 : 01:46:12
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Actually ImageEnView.Update() is necessary whenever you change the internal IEBitmap (or Bitmap), but not for ImageEnView.Proc.etc calls. For example:
// update necessary
ImageEnView.IEBitmap.Fill(clBlack);
ImageEnView.Update();
// update not necessary
ImageEnView.Proc.Fill(clBlack); |
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Assign to ImageENView with Transition?
