Is image masking supported by LispWorks?
I have JPEG and PNG images with a separate greyscale (0-255)
transparency mask.
I need this to work on Mac OSX and Windows and I do not want to
involve OpenGL.
Thanks, Joel
--
http://wagerlabs.com/uptick
I should probably elaborate ...
I'm using LispWorks 4.4.5 on Mac OSX 10.4.2. I can simulate
transparency by combining pixel values of source, target and mask
images by hand. This works but is very slow.
CAPI let me create colors that include an alpha component. I tried
setting the alpha value of every pixel in my source image from the
mask image and then drawing the source image on top of the target.
This is turns out to be 30% faster but the alpha channel is not being
used.
Is the alpha channel in LispWorks just for show and how do I use it
if it's not?
Does anyone know an easy cross-platform way of getting hold of raw
pixel data in LispWorks?
I did this a few months ago but it required separate code for Cocoa
and Windows.
Thanks, Joel
On Aug 6, 2005, at 2:32 AM, Joel Reymont wrote:
> Is image masking supported by LispWorks?
>
> I have JPEG and PNG images with a separate greyscale (0-255)
> transparency mask.
>
> I need this to work on Mac OSX and Windows and I do not want to
> involve OpenGL.