[mcclim-devel] Image-reading in McCLIM

[Troels Henriksen]

David Lichteblau <david at lichteblau.com> writes:

> 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.

I don't see much point in making it completely CLIM-independent, you
can't use the loaded images for anything but displaying them.

> 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.

Ah, so we have two image-like things, CLIM patterns and RGB images? I
guess the LOAD-IMAGE function would then be specified as returning a
design object, with the actual implementation for each image type
deciding upon what is most convenient. Perhaps it could even be
checked dynamically - a JPEG image that is mostly monochrome might be
efficiently represented as an indexed image.

-- 
\  Troels
/\ Henriksen