Re: XForms: Problems with image functions

T.C. Zhao (tc_zhao@yahoo.com)
Wed, 29 Sep 1999 08:08:06 -0700 (PDT)

# To subscribers of the xforms list from "T.C. Zhao" <tc_zhao@yahoo.com> :

Hi Frank,
Thank you very much for the message. It's exactly
the kind of feedback I was looking for. I'll be looking
into these issues very shortly.
Regards, -TC

--- Frank Hartung <F.Hartung@material.physik.uni-goettingen.de> wrote:
> # To subscribers of the xforms list from Frank Hartung
> <F.Hartung@material.physik.uni-goettingen.de> :
>
> Hi,
>
> I am using XForms Version 0.89 on Linux (glibc2.1) and Digital Unix.
> The
> X-Server on the machines work in Pseudocolor Mode. I found some the
> image support doesnt work right in all situation. I found so far the
> following things (most tests done with 8 and 16bit grayscale images).
>
> 1. The FL_IMAGE field sh und sw doesnt work right in
> flimage_display.
> sh is ignored. sw does clipping in both directions. This was tested
> with
> version glibc2.1 / Sep 27 and Digital Unix 4.x by changing the
> ibrowser.c program (insert a image->sh/sw = (float)image->h/w / 2.0
> in
> load_and_show function and load an image).
>
> 2. flimage_display ignores fl_set_clipping window and draws always
> the
> whole image (glibc2.1 / Sep 27).
>
> 3. flimage_display has problems with double buffering. I used
> flimage_display in a cavanas and the image was always drawn direct to
> the screen (also in double buffer mode). Then I wrote an new object
> an
> but flimage_draw in the draw section of my event handler. This works
> in
> non double buffer mode. When i enable double buffer (-double option
> in
> command line), the program terminates with the following XWindows
> error:
>
> X Error of failed request: BadWindow (invalid Window parameter)
> Major opcode of failed request: 3 (X_GetWindowAttributes)
> Resource id in failed request: 0x80003d
> Serial number of failed request: 812
> Current serial number in output stream: 813
>
> (message of glibc2.1 / Sep 27 XForm Libary, similar message on
> Digital
> Unix System).
>
> 4. flimage_display writes on screen when form update (fl_form_...) is
> disabled.
>
>
> Here are some informations about my system:
>
> glibc2.1 System: Suse Linux 6.2 (Kernel 2.2.7), Pseudocolos (256, S3
> Card, XServer xsvga), XForms 0.89 / Sep 27.
> Digital Unix 4.0e: Dec Alpha 21064 CPU, Pseudocolor (256, direct and
> via
> PC X-Server), XForms 0.89.
>
> So what can i do? I would like to help debugging (especially the
> image
> support), which i need for reimplementation of our image processing
> tool.
>
> Thanks.
>
> Frank Hartung
>
> --
> Dipl. Phys. Frank Hartung
>
> Institut fuer Materialphysik der Universitaet Goettingen
> Hospitalstr. 3-7
> D-37073 Goettingen GERMANY
>
> E-Mail: F.Hartung@material.physik.uni-goettingen.de
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