[lazarus] ImageList editor and more

andrew johnson acjgenius at earthlink.net
Sat Mar 1 23:40:20 EST 2003

On Thu, 2003-02-27 at 05:28, Jens Arm wrote:
> > Fine update :)
> > 
> > But xpm's which are added and then e.g. shown in a ListView are only as a mix of colors shown.
> > (in the Image List Editor, too. If you open it a second time)
> > 
> In the console I get such an error/warning:
> WARNING: [TgtkObject.LoadFromPixbufData] loading data FAILED!

thats probably because of one of two reasons, a) your gdk-pixbuf is too
old, I would suggest 0.18, but anything >= 0.13 should work. and b) the
bitmap saving code is incomplete, and at best a buggy hack. I haven't
had a chance to look in a long while, but when I wrote it I was just
trying to fill in as much of the blanks with regards to canvas and
graphics components as possible, so full functionality was never

The biggest problem is that in gtk1.2 there is no way to save
information to a file, though it can be loaded via gdk-pixbuf, so the
routine to save it is not correct for various reasons. The most
important reason is that the code is designed around win32 api which is
not a particularly sane way for handling multiple file formats, much
less proper data formatting to save to a file.So right now the code
attempts to dump the proper bitmap header to a file, and grab the bits
into the proper format and dump them as well. Since however the pallette
functionality has not been completed either, this is not entirely

In any event, until such time as palette code can be properly handled in
the gtk interface, and the bitmap code can be more sanely implemented,
or an external library can be found to export GdkPixbuf's to a file,
this is simply not going to work properly for all images. Especially for
non-Index'ed images. 

I would suggest trying to use only indexed 256 color images. Or only
load images at runtime via the image/graphics load from file routines.

Or better yet, finish the code! I have many grandios plans for this, but
the truth being I simply do not have the time to work on any of them,
nor have had for several months,and while eventually I hope to be able
to do many things, especially within the Win32, GTK2 and future GNOME2
interfaces, the biggest stumbling block will be gtk1/gnome1. And though
at this point it almost becomes moot as GTK1 is fast becoming
obsolete,GTK1 is still the main development interface, and thus the most


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