Quoting Troels Henriksen (athas@sigkill.dk):
To rectify this, I think we should bundle some simple library with
Good idea.
I wonder whether that library could be external to McCLIM, so that other applications could also use it. As long as it just returns arrays of colors in the format CLIM wants, it would plug right into our image drawing routines and still not have to depend on CLIM internals itself.
McCLIM for converting image files to CLIM patterns, just like CLIM-INTERNALS::XPM-PARSE-FILE does.
The indexed pattern code would be used for images with a palette, like GIF and XPM.
(I see something called rgb-image.lisp in mcclim/Extensions, what is it used for?)
That's the second image format we would want to support, for 24 bit RGB colors (plus alpha channel), originally from Closure.
RGB-IMAGE is the right class to return when parsing JPEG or one of the formats that might or might not have a palette (PNG, BMP).
The format-specific image library could just return the (unsigned-byte 32) array as needed for RGB-IMAGE, with the latter being wrapped around it by CLIM code.
d.