Re: Drawing 1-bit bitmaps

[John Cupitt <jcupitt gmail com>]

On 11/1/05, Juhana Sadeharju <kouhia nic funet fi> wrote:
> What library can load 1-bit images to a format GTK understands?
> My 1-bit images have been very large, the library should be
> able to extract only a rectangle from the image before converting
> anything to 24-bit.
>
> What library can handle tiled image formats?

I don't think gdkpixbuf can do on-demand conversions like this. It
will load 1-bit images as complete 24-bit images.

The TIFF library can handle 1-bit compressed tiled images and only
convert the areas you need. Perhaps you could call that directly?
ImageMagick has similar facilities: if you call GetImagePixels() it
will, if possible, just decompress that section of the image.

John