Re: 1-Bit Bitmap

["James Morris" <james jwm-art net>]

I recently wrote a window-placement-like algorithm for a 128x128 grid
using bit manipulation. You might find some of the code useful for writing
your own library code to do what you require. It does not have any
functions to set individual bits in the array, but it does have a function
to unset areas in the 2d array, and another function to locate an unset
area of width x height dimension, then set it, and return its coordinates.

http://jwm-art.net/boxyseq/freespace_grid.tar.bz2

There's probably being no license info within the archive, but please
assume GNU GPLv3.

James.


On Tue, June 1, 2010 03:45, Asad Jibran Ahmed wrote:
> On Mon, 2010-05-31 at 20:59 +0200, Tadej Borovšak wrote:
> > Hello.
> >
> > > I'm looking to create an application that requires using 1-bit bitmaps
> > > to store a monochrome printing pattern. But I've looked at both
> > Pixmaps
> > > and Pixbufs, but Pixbufs doesn't offer direct access to the bits (I
> > need
> > > to set and read them) and Pixmaps doesn't support 1-Bit pixels (at
> > least
> > > that's what I understand from my reading of the docs).
> > > Any suggestions?
> >
> > cairo_image_surface_t can have a depth of one bit (CAIRO_FORMAT_A1)
> > and offers direct access to pixel values.
> >
> > Tadej
>
> Thanks for the info, but thats not what I was looking for. cairo
> surface_t offers direct access to the data of the image, from which I'll
> have to pick out the bits one by one. I'm hoping a library will be able
> to do this for me.
> Any library that you can think of that offers bit by bit access without
> me needing to write a separate function to shift the bits out one by one
> from a 32-Bit int? Kind of like a bitarray?
>
> --
> JB :: http://www.asadjb.com
>
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