warlock@csuchico.edu (John Kennedy) (03/03/90)
I'm looking for the "best" way to transfer user-defined data (say an array of char) and put it into a drawable (color). The only way I can see now with the current X11R4 Xlib documentation is to convert the drawable into an XImage and the get at the data field. In addition, I have the following situation: Running on a Sun 3/60 or SPARC using cgfour and cgsix frame buffers. X11R4 (Standard distribution) We're looking for *speed* out of this operation The operation will be used to copy the contents of the frame buffer memory into a drawable so the screen can be fully managed by X when we aren't using speedy frame-buffer functions (for those in the know, the cgfour is too slow to alter quickly using window-related functions, so a program I wrote directly accesses frame buffer memory, leaving the screen with incorrect contents as far as X is concerned). Basically, I want to take the image on the screen and store it in the drawable so X has the same image. The area X and I are sharing is a 769 by 769 square. Warlock, AKA +---------------------------------------------------- John Kennedy | uucp: lampoon!warlock@csuchico.edu CSCI Student | internet: warlock@csuchico.edu CSU Chico +---------------------------------------------------- -- Warlock, AKA +---------------------------------------------------- John Kennedy | uucp: lampoon!warlock@csuchico.edu CSCI Student | internet: warlock@csuchico.edu CSU Chico +----------------------------------------------------
rws@EXPO.LCS.MIT.EDU (Bob Scheifler) (03/06/90)
I'm probably just not awake yet, but I found your message very confusing.
for those in the know, the cgfour is too slow to
alter quickly using window-related functions,
I'm in the know, and I don't know that. :-) That's rather a blanket
statement, more particulars to back up the statement would be nice.
I can't even tell if you're talking about graphics functions or
window tree manipulation functions, or what.
so a program I wrote directly accesses frame buffer memory, leaving the
screen with incorrect contents as far as X is concerned
If you're just manipulating the "insides" of a window (i.e. the graphic
content), then the server doesn't really care what you've done.
Basically, I want to take the image on the screen and
store it in the drawable so X has the same image.
Perhaps you don't understand, what's on the screen *is* all that "X has"
(unless backing-store/save-unders are involved) for window contents.