nanogui: Thread: Transparent bound for polygon window draw

Dear All,

I want to draw a polygon window like tux. After studied tux.c I found a
way to do that, it's using a GrNewBitmapRegion to mask the visible
region. The mask data tuxmask_bits was generated by convbmp.
But since my background image can be change by user(it's a skin). So,
the mask data must be generated up to user's skin image when the program
loading the skin. 
So, any other easy way to do that? Or how can I generate a mask data in
my program according user's BMP?
Any ideas from you? Thanks!

Alex

:) I have got the way, just use GrNewRegionFromPixmap to load a mask
bmp. It works!

On Thu, 2006-11-09 at 14:47 +0800, ####@####.#### wrote:
> Dear All,
> 
> I want to draw a polygon window like tux. After studied tux.c I found a
> way to do that, it's using a GrNewBitmapRegion to mask the visible
> region. The mask data tuxmask_bits was generated by convbmp.
> But since my background image can be change by user(it's a skin). So,
> the mask data must be generated up to user's skin image when the program
> loading the skin. 
> So, any other easy way to do that? Or how can I generate a mask data in
> my program according user's BMP?
> Any ideas from you? Thanks!
> 
> Alex