From: Clifford Heath <no@...>
Date: 2004-11-20T15:33:09+09:00
Subject: Re: bitmaps, GTK and RMagick.

Joe Van Dyk wrote:
> How can I create a bitmap in Ruby?  I have a bunch of RGBA values, and need
> to convert them into a bitmap or some other picture format.

I wanted the reverse recently, and I used RMagick to read my png
files. It would probably work for what you want also.

I was experimenting with a new image coding method like PNG with
Adam-7 pixel ordering, that yields some nice behaviour for raster
maps in that you can create a 1/Nth scale map (N a power of two)
by reading and decompressing only 1/N^2 of the file.

I'd like to write a viewer for the resultant files, but I need to
work out how to create GTK images using RBG data. Any examples
to look at?

I also want to use dynamic images in a column of a GTK treeview.
It looks like it should be possible, but I've scratched my head
nearly hairless trying.

Nice PNG code Michael, thanks.