Re: problem with drawing 32bit image to 16bit screen (works with 32/24 bit screen)

[Patrick Sung <phsung ualberta ca>]

Hi,

I have made a XImage dump to a file and compared both the output from 
the 32bit and 16bit systems.  Well, it seems like the capture card 
library is not doing the things I want it to do.  In the 16bit system, 
the bitmap seems to in 16 bpp while the 32bit system gives me a 32bpp 
bitmap (I already called a function to change the output bitmap to 32bit 
regardless of what depth the system has).

There has been some work that use native X windows calls (non-gtk app, 
but openmotif app) and it works seamlessly in both systems.  Should I do 
that, and if so how?  The prototype for XPutImage is:

XPutImage (Display *display, Drawable drawable, GC gc, XImage 
*image_buf, src_x, src_y, dest_x, dest_y, width, height)

if not, should I get a gray scale (not packed 8bit per pixel) and 
convert them on the fly to packed 8 bpp and use gdk_draw_gray_image()? 
(this looks slow to me because I need to display live video stream).

Regards,
Patrick