Solved

Slow images in NT/W2k/XP

Posted on 2002-03-15
6
155 Views
Last Modified: 2010-04-05
I have an app which loads a proprietry file containing a large number of jpeg images and displays them. The images are decompressed and displayed in standard TImages.
If I run the app under W95/W98 etc I can display up to about 40 images/sec.  If I run it under NT/W2k/XP it slows to about 2 or 3 images/sec. This happens on many different machines including some with very fast processors and high power graphics cards. You can see the images repainting on the screen - it's horrible.
The original app was written in Delphi3. I have just converted it to D6 and compiled it on a W2k machine and it is still exactly the same.
Is there some trick and/or setting to make, either to the OS or to the app or component, to make Timages work faster with NT etc?

This is really bugging me - 200 points to the winner.

Regards,  John
0
Comment
Question by:jellison
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 9

Expert Comment

by:ginsonic
ID: 6867966
listening
0
 
LVL 3

Expert Comment

by:SteveWaite
ID: 6868472
Sounds like too many events setting off.
How are you painting?

Regards,
Steve
0
 
LVL 1

Author Comment

by:jellison
ID: 6868683
I first decompress the jpeg into a hidden image. Then I check the jpeg comment data embedded in it before copying it to a visible image by doing

ImageN.Picture := HiddenImage.Picture;

Regards,  John
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 3

Accepted Solution

by:
SteveWaite earned 200 total points
ID: 6869764
Do you do that in OnPaint?

You say you can see it painting the images, is that flashing or the pixels slowly updating.
I'm thinking along the lines of windows doing loads of unneccesary repaints.

I usually BitBlt() to a TPaintBox because I think TImage is intended to keep the picture where TPaintBox must be updated.

Regards,
Steve
0
 
LVL 1

Author Comment

by:jellison
ID: 6947838
Just tidying up. Haven't solved it yet but I will post another question in a different way.
0
 
LVL 3

Expert Comment

by:SteveWaite
ID: 6949062
Thanks! only wish I could help further. I will keep an ey out for the next q.
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question