nanogui: regions
Subject:
Re: regions
From:
####@####.####
Date:
20 Dec 2000 02:05:09 -0000
Message-Id: <001001c06a29$8ce47640$36c809c0@sunyong>
Sr,
I don't know how the 'Bands' arraying in a 'Region' ,
and how the 'Rectangles' arraying in a 'Band' .
I have studied the source code ,
but it's much difficult to master the arithmetic .
For example ,
Can the Regions can array like that :
00000000000000000000
0 0
0000000000000000000000000000 0000000000
0 0 0
0
0 0 0000000000
0 0
000000000
Or like this:
00000000000000000000
BAND 0
0 0
0000000000000000000000000000 0000000000 BAND 1
0 0 0
0
000000000 0000000000
BAND 2
0 0
000000000
Regards,
FindSun
----- Original Message -----
From: "Greg Haerr" ####@####.####
To: ####@####.####
Cc: "nanogui" ####@####.####
Sent: Wednesday, December 20, 2000 8:19 AM
Subject: regions
> The region code for Microwindows builds a dynamic
> array of non-overlapping rectangles which can completely
> specify any set of pixels on a display surface. Both
> the Nano-X API and Win32 fully support user-based
> regions as well as the visible clip region for a window. When
> a user-based region is used, it is intersected with the
> window's visible clip region for the final clip region.
>
> In addition, Microwindows' win32 API keeps up the
> notion of an "update region" which is a potential subset
> of the visible region that has been invalidated through
> InvalidateRect or InvalidateRegion. This additional
> feature allows flicker-free redrawing for areas of a window
> when a window is fully repainted but doesn't need it.
>
> Regards,
>
> Greg
