XForms: Image Support

Andrew Davison (davison@caspc1.etl.go.jp)
Thu, 15 Apr 1999 03:01:24 +0900

# To subscribers of the xforms list from Andrew Davison <davison@caspc1.etl.go.jp> :

I have been playing with the image support in the new test release of
XForms and so far I am very impressed (it is easy to use and seems
fast).

Just a few questions/points:

1. I noticed some strange behaviour when trying to read ppm images:
I get a segmentation fault if I call
flimage_load("test.ppm");
straight off, but it works correctly if either
flimage_enable_pnm();
or
flimage_is_supported("test.ppm")
is called first. I thought from the manual that ppm/pgm/pbm formats
should be enabled by default?

2. I couldn't get the PGM greyscale format to work at all, either for
read or write. Is this implemented yet?

3. When using 8-bit greyscale images, must my 8-bit data be copied
into the unsigned short **gray array or is there a byte grayscale
array available somehow?

4. Why does flimage_getmem() not appear in the header file forms.h?
(It links OK though).

Thanks,
Andrew Davison
Electrotechnical Laboratory
Tsukuba, Japan
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