Grx February 2000

grx@gnu.de

4 participants
6 discussions

Pixmap and SubContext
by Josu Onandia 17 May '00

17 May '00

>Josu Onandia wrote: >> I would like to 'gray' the screen, as in Windows when you shut-down. >> Can anyone suggest an efficient way to do this?. >What about ANDing the screen with a pattern of alternating bits? >Hope this helps, > Peter Thank you, Peter. It works perfectly. But now I've run into another problem: I'm applying the pixmap to a SubContext, not to the whole screen. It seems that the function GrPatternFilledBox doesn´t take this into account, and starts painting at left corner of the screen, not of the SubContext. I suspect that the line (file patfbox.c, function GrPatternFilledBox): (*bltfun)( &CURC->gc_frame,xpos,y1, &p->gp_pxp_source,xcuroff,yoff,fillw,fillh, p->gp_pxp_oper ); should be: (*bltfun)( &CURC->gc_frame, xpos+CURC->gc_xoffset, //adding the subcontext offset y1+CURC->gc_yoffset, //adding the subcontext offset &p->gp_pxp_source,xcuroff,yoff,fillw,fillh, p->gp_pxp_oper ); I've implemented the change, and it works. I wonder if it's a bug or it's something else I'm doing wrong. Josu

3 9

Problems with GrCursor
by Josu Onandia 23 Apr '00

23 Apr '00

Hi all, I've been having problems with the GrDisplayCursor function. In my case, sometimes the cursor is drawn partially. I think I've found the error in GrDisplayCursor. If the cursor is 8 pixels wide, the work area is 16 pixels wide. Let's supose a call to GrDisplayCursor with C->xcord = 323: C->xcord = 323; C->xoffs = 0; C->xsize = 8; C->xwork = 16; ----------------------- call GrDisplayCursor xpos = 323; xsiz = 16; xwrk = 312; ... (save bitmap from 312 to 327) [our cursor goes from 323 to 330] ... xpos = 11; xsiz = 8; if(xsiz > (C->xwork - xpos)) xsiz = C->xwork - xpos; ====> xsiz = 5; (draw a cursor 5 pixels wide) IMHO this is a bug. I think GrDisplayCursor tries to place the cursor in the middle of the work area, but in a coordinate multiple of 8: xwrk = (xpos - (C->xsize >> 1)) & ~7; but sometimes the result lets the cursor partially outside the work area. I think after this line is necesary a correction: if((xpos + C->size) > (xwrk + xsiz)) xwrk += 8; The same applies to vertical coordinates. What do you think about it? Josu Onandia Dpto. I+D Software. e-mail: jonandia(a)fagorautomation.es ---------------------------------------------------- Fagor Automation, S.Coop. Barrio San Andres, s/n - P.O. Box. 144 Mondragon 20500 - SPAIN http://www.fagorautomation.mcc.es

2 1

Asking for suggestions
by Josu Onandia 22 Feb '00

22 Feb '00

Hi, I would like to 'gray' the screen, as in Windows when you shut-down. Can anyone suggest an efficient way to do this?. Any idea would be wellcomed. Thanks Josu Onandia

2 1

Problems with color table with linux
by DAANEN Vincent 21 Feb '00

21 Feb '00

Hi there I meet a strange problem with grx23 version of linux. I'll try to explain it the better I can My default resolution is 1024*768. The problem occurs in either mode (24 bits, 16 bits, 8 bits) - I run my prog, asking for a 8 bit depth color - I create a gray-level color table - When I display images, I obtain stange colors ( pink,green, blue,... ) and when my prog window losses the focus, colors are well displayed. - I tried to used GrSetDriver("xwin::privcmap") but it does nothing. What's the bug ?

1 0

background of an image delete the previous image..
by Leonardo Alejandro Bustos Wallace 12 Feb '00

12 Feb '00

Hi! I work whith grx20 in DOS, and I create an image using Context and bitmap: GrImageBuild (2 ways, seperately). I don't know how put the image with the background of the image (black) without deleting the previous image. I think that's the problem itsn't big, but I try in all the ways. Can someone help me? chao! ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

2 1

List archive working again
by Anja Drewitz 08 Feb '00

08 Feb '00

Hello, the list archive at should be working again now. The URL is http://www.gnu.de/archive/wilma.cgi/grx and http://www.gnu.de/archive/wilma.cgi/grx-announce respectively. Best wishes, Anja

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Grx February 2000