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Re: New bitmap code - testers required
From: |
Charles Philip Chan |
Subject: |
Re: New bitmap code - testers required |
Date: |
Wed, 30 Jan 2002 16:45:10 -0500 |
On Wed, 30 Jan 2002 20:03:40 +0000
Pete French <pete@twisted.org.uk> wrote:
Hello Pete:
> > (1) It crashes sometimes. Please see attached file for a backtraces.
>
> Hmm, thats interesting - the crash is in a piece of code I didnt touch at
> all, so the behaviour should be no different. Possibly I am corrupting
> memory somewhere along the way ? Does this always happen on the same
> image,
After further testing it looks like the crash is caused by the rounding
error as discussed in previous thread:
Coordinate transformatioins [Was: Release of gui libraries]
as the images that crashes the program are the same. Also, I am not too
sure how accurate the backtrace is because every time I load the debug
version of Gworkspace.app it crashes on the first image (any) that I load
into the Content Inspector.
> Are you drawing a large image into a very small space every time ? It
> shouldnt be any slower than before to display a normal 8 bit image, but
> minification will slow it down considerably, as will reading from any
> oddly aligned bitmap structure. Cacheing a created thumbnail is probably
> a very good idea in general.
Yes, I am. I was testing it by scrolling through a directory of large
images with the Content Inspector open in Gworkspace.app- it was painful.
Also, images that are smaller than the Content Inspector are being scaled
up which is not a good behaviour.
Please also deregard my png comment, I thought that the images that I had
in a certain directory were png's but in fact they were jpeg's. Still no
png's in the Content Inspector :-(.
> and if so could you send me that image so I can see how the
> decoding is being done and to verify that it is doing that part properly
I will send one to you privately. I don't want to send large attachments to
the list.
Regards,
Charles
--
The box saids Windows XP or better, so I installed Linux
Message not available
Re: New bitmap code - testers required, Willem Rein Oudshoorn, 2002/01/31