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OrbWorks Community Forum • View topic - Reading Pixels
Page 1 of 1

PostPosted: Tue Jul 13, 2004 5:33 pm
by reguser
I would like to take a snapshot of a rectangle on the screen, and store it in a buffer. Is it possible, using the off-screen buffers, or by any other means, to read in the pixels (one by one, or as a larger rectangle) on the screen?
Tom

PostPosted: Tue Jul 13, 2004 6:52 pm
by FrankG
Is a buffer copy the kind of thing you're looking for? It can go from screen buffer to offscreen buffer and vice versa. I haven't played with them much but I suspect saving the buffers might be a trick. Don't know if that can be done but it gets you started, I think.

Frank

PostPosted: Wed Jul 14, 2004 10:23 am
by reguser
Frank,
Thanks for the reply.
Yes what you mentioned (on screen buffer <--> off screen buffer) would do the trick. But in reading the procedure definitions it seems like I can't copy from the screen ... rather it looks like I have to write directly to the buffer, then 'paste' to the screen.
Tom

PostPosted: Wed Jul 14, 2004 1:43 pm
by FrankG
Tom,

In the language function reference where it discusses the bucopyrect function, it says

"bucopyrect(int sid, int xs, int ys, int w, int h, int did, int xd, int yd, int mode)
- copy the rectangle at (xs,ys) with the given width and height from buffer sid to buffer did (or 0 for screen) "

So to copy from screen to buffer, you can
bucopyrect(0,xscreen,yscreen,w,h, destbuffer,xbuff,ybuff,mode)
since a buffer 0 as the source buffer ID indicates copy from screen.

bucopy works similarly for the whole screen.

Or am I misunderstanding your requirement?

Regards,
Frank

PostPosted: Wed Jul 14, 2004 5:42 pm
by reguser
Frank,
You are completely right, I never clued into the '0' for screen option. I haven't tried it out yet, but I'll give it a shot.
Thanks for your help!
Tom