Re: [Plplot-devel] gd driver and dlopen() flags

[Alan W. I. <ir...@be...>]

On Mon, 16 Sep 2002, [iso-8859-1] Jo=E3o Cardoso wrote:

> Plplot library version: 5.1.0
> plLoadDriver: Device not loaded!
> plLoadDriver: tag=3Dpng, drvidx=3D4
> plLoadDriver: Trying to load gdd_drv.so on ./drivers/gdd_drv.so
> plLoadDriver: Local dlopen failed because of the following reason:
> ./drivers/gdd_drv.so: undefined symbol: gdImagePalettePixel

I am so glad to see this error message finally deliver something meaningful=
!

> [jcard@feup] rpm -q gd
> gd-1.8.4-238
>
> And gdImagePalettePixel() does not exists in the gd library.

I have investigated further, and it is an undocumented but small
macro in version 2.0.1 of libgd which I presume is not in 1.8.4 since
Joao's compiler didn't find it.

#define gdImagePalettePixel(im, x, y) (im)->pixels[(y)][(x)]

Andrew, I am not sufficiently familiar with libgd to know whether this macr=
o
would work for version 1.84.  If you know it would work, we could put this
macro definition into gd.c.  Alternatively, we could just drop
plD_gd_optimise with #ifdefine if the GD version is not greater than 2.
Please make whichever change you feel is appropriate.

Alan