[SDL] SDL_Image patch for ILBM Amiga images

[David Raulo]

Hi all,

Here's a patch for SDL_Image, adding support for classic Amiga ILBM formats:
- fixes a small bug with stencil (images with a transparent color but no
stencil/mask plane could not be read)
- fixes colormap for EHB ("Extra Half Brite") mode (these images have 6
bitplanes, but the colormap only contains 32 colors. The second half of the
colormap has to be a copy of the first one, with brightness divided by 2)
- adds support for HAM ("Hold And Modify") and HAM8 modes. These are
converted to 24bits images.

Detailed information about these formats can be found on
http://netghost.narod.ru/gff/graphics/summary/iff.htm

The attached patch is a unidiff against SDL_Image version 1.2.3.  I tried it
on 2 debian/testing systems (x86 and PPC), seems to work great.  Please
contact me if this patch needs some work in order to be accepted.

Bye!

David.


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