Terminal pixel size

[alexfish]

Hi Peter

Does BaCon have a method of reporting pixel sizes of a terminal ?

in my version of a pseudo terminal I am setting the ioctl using 'struct winsize ws'

Like so
 rc = tcgetattr(fds, &slave_orig_term_settings);

 new_term_settings = slave_orig_term_settings;
 cfmakeraw (&new_term_settings);
 tcsetattr (fds, TCSANOW, &new_term_settings);
memset(&ws, 0, sizeof(ws));
ws.ws_col = TERM_COLS;
ws.ws_row = TERM_ROWS;
   ws.ws_xpixel = TERM_COL_PIXELS;
   ws.ws_ypixel = TERM_ROW_PIXELS;

if (ioctl(fds, TIOCSWINSZ, &ws) < 0) {
Print "Failed"

   }

can get results from bacon using
PRINT "Columns , Rows ", COLUMNS, ",", ROWS
results
Columns , Rows 87,23

if 'No method' , would it be possible for BaCon to Have One.

BR
Alex

[Pjot]

Hi Alex,

It seems that the libc source code does not use those fields.

Console sizes usually are calculated in terms of characters. For pixel sizes, maybe it is better to use a canvas...

BR
Peter

[alexfish]

Hi Peter

Well Think you are correct , since I tried the "TIOCGWINSZ" got a fail on the write to; re the pixels

but since , I also found that the 'struct winsize' shows only two fields

odd ball in this arena is xterm

using this ::

struct winsize sz;
ioctl(0, TIOCGWINSZ, &sz);

this will print all four fields from the xterm , and fails in RPI 'lxterminal' and 'gtk vte'

and yes can do this internally to the pseudo terminal , from the canvas

IE
width  = widget->allocation.width;
height = widget->allocation.height;

this relates in size of char inks : so from the Pango layout draw routine I have those Variables mention above


TERM_ROWS= height/CharHeight;
TERM_COLS= width/CharWidth;
TERM_ROW_PIXELS=TERM_ROWS*CharHeight;
TERM_COL_PIXELS=TERM_COLS*CharWidth;

BR
Alex

Example of pixels :: works in Xterm
PROTO ioctl

LOCAL  ws TYPE struct winsize
ioctl(0, TIOCGWINSZ, &ws)

PRINT "pixels " , ws.ws_xpixel , ":" , ws.ws_ypixel

[alexfish]

decided to hack around the source code of xterm ?

found some bits under HACKS and found these


#if defined(TIOCSWINSZ)
#define USE_STRUCT_WINSIZE 1
#define TTYSIZE_STRUCT struct winsize
#define GET_TTYSIZE(fd, data) ioctl(fd, TIOCGWINSZ, (char *) &data)
#define SET_TTYSIZE(fd, data) ioctl(fd, TIOCSWINSZ, (char *) &data)
#define TTYSIZE_COLS(data) data.ws_col
#define TTYSIZE_ROWS(data) data.ws_row
#endif /* TIOCSWINSZ */
#endif /* TTYSIZE_STRUCT */

#ifndef USE_STRUCT_WINSIZE
#error "There is a configuration error with struct winsize ifdef"
#endif

/* "resize" depends upon order of assignments in this macro */
#ifdef USE_STRUCT_WINSIZE
#define setup_winsize(ts, rows, cols, height, width) \
   (ts).ws_xpixel = (ttySize_t) (width), \
   (ts).ws_ypixel = (ttySize_t) (height), \
   TTYSIZE_ROWS(ts) = (ttySize_t) (rows), \
   TTYSIZE_COLS(ts) = (ttySize_t) (cols)
#else
#define setup_winsize(ts, rows, cols, height, width) \
   TTYSIZE_ROWS(ts) = (ttySize_t) (rows), \
   TTYSIZE_COLS(ts) = (ttySize_t) (cols)
#endif

BR
Alex

[alexfish]

Hi All

do not need the hacks

the code inside the pseudo terminal

  rc = tcgetattr(fds, &slave_orig_term_settings);

 new_term_settings = slave_orig_term_settings;
 cfmakeraw (&new_term_settings);
 tcsetattr (fds, TCSANOW, &new_term_settings);
memset(&ws, 0, sizeof(ws));
ws.ws_col = TERM_COLS;
ws.ws_row = TERM_ROWS;
   ws.ws_xpixel = TERM_COL_PIXELS;
   ws.ws_ypixel = TERM_ROW_PIXELS;

if (ioctl(fds, TIOCSWINSZ, &ws) < 0) {
Print "Failed"

   }

and the bacon code
PROTO ioctl

LOCAL  ws TYPE struct winsize
ioctl(0, TIOCGWINSZ, &ws)

PRINT "pixels " , ws.ws_xpixel , ":" , ws.ws_ypixel


the results

pixels 783:368


& + rows

PROTO ioctl

LOCAL      ws TYPE struct winsize
ioctl(0, TIOCGWINSZ, &ws)

PRINT "pixels " , ws.ws_xpixel , ":" , ws.ws_ypixel
PRINT "col : row " , ws.ws_col , ":" , ws.ws_row

results


pixels 783:368
col : row 87:23

BR
Alex
Picky of first section of code

Attachments:

[Pjot]

Hi Alex,

Good find, but your code seems to work for XTerm only, which is one of the more superior terminal programs around.

However, when I test your code with rxvt, lxterminal, XFCE terminal, Gnome Terminal, or the plain Linux console terminal, your code produces 0,0 for the pixel sizes...

Best regards
Peter

[alexfish]

Hi Peter
xterm yes, also
the code works with
urxvt
ktermrxvt
rxvt-unicode

+ AlexTerm

Forgot this one
mlterm

other term's
stterm
BR
Alex