On Tue, Oct 11, 2005 at 06:21:25PM +1000, Emil Mikulic wrote:
> On Tue, Oct 11, 2005 at 05:10:53PM +0900, Carsten Haitzler wrote:
> > aah - but theres 2 bits of endianess handling to be done. 1 at the
> > rgbaimage level which is what that is fidldign with. the OTHER is at
> > the ximage ouptut level.
>
> That's what I thought. Problem at the X interface, not the image
> loader.
>
> > try display form that ppc box onto your fbsd x86 box :)
>
> Sorry if the previous mail was vague, but we don't have a PPC here.
> Geoff said that PPC works on the basis of Googling around. =)
>
Not quite, I based it on a code comment in loader_png.c line 125:
/* note form raster: */
/* thanks to mustapha for helping debug this on PPC Linux remotely by */
/* sending across screenshots all the tiem and me figuring out form them */
/* what the hell was up with the colors */
/* now png loading shoudl work on big endian machines nicely */
#ifdef WORDS_BIGENDIAN
png_set_swap_alpha(png_ptr);
png_set_filler(png_ptr, 0xff, PNG_FILLER_BEFORE);
#else
png_set_bgr(png_ptr);
png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
#endif
I have no idea if swapping the alpha channel around fixes anything with regard
to endianess but it apparently works for someone :/
One final note, we have an 8-bit greyscale PNG which both endian-versions
display in blue, which I guess hints slightly more at the display side of
things causing problems. (this image isn't in the aforementioned test image
sets however)
--Geoff
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