[p900] direct screen P900
- From: Alfonso Martone <a.martone@xxxxxxxxxxx>
- To: p900@xxxxxxxxxxxxx
- Date: Fri, 16 Apr 2004 23:34:01 +0200
Studying the e32frodo code I found that one *can* use the UIQ screen
directly, as the Good Old DOS/VGA times, when men were men and wrote
directly in the graphics card buffer, without asking permission to the
underlying operating system, and without caring of portability issues
:-)
#define SCREEN unsigned short // as of gcc539arm-epoc-pe this is 16 bit
SCREEN *screenpointer() // YES, this code was successfully tested
{
TPckgBuf<TScreenInfoV01> info;
UserSvr::ScreenInfo(info);
return (SCREEN*)(info().iScreenAddress);
}
void directscreen() // YAY!!! this just runs on my P900!!!
{
SCREEN *ptr=screenpointer(); // initialize once
ptr[208*305+197]=0x001f; // write a full blue pixel at (197,305)
SCREEN pixel=ptr[208*4+15]; // read pixel value at (15,4)
}
The TScreenInfoV01 object is defined in e32svr.h but the official
documentation does not cover its usage. Anyways, the directscreen()
function above does what you expect, and this is sufficient to say to
you all "have fun with it" :-) You only need to remember that the bit
mapping is 5-6-5 (5 least significant bits for blue, 6 center bits for
green, 5 most significant bits for red). Don't forget that external
events (for example a flip-close) set up a screen redraw for some
OS-managed window (you could use one of those direct-screen classes to
tell the system what you are doing, but I didn't investigate this yet).
Oops: little investigation here (one single link!!!)
http://developer.sonyericsson.com/site/global/techsupport/
tipstrickscode/symbian/p_dectectwhenp800screencoveropens.jsp
Other related posts:
- » [p900] direct screen P900
