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/*
netrik -- The ANTRIK Internet Viewer
Copyright (C) Olaf D. Buddenhagen AKA antrik, et al (see AUTHORS)
Published under the GNU GPL; see LICENSE for details.
*/
/*
* screen.c -- all screen handling functions (curses wrappers).
*
* (C) 2001, 2002, 2003 antrik
*
* Presently the full screen functions aren't used by the main program...
*/
#include <ncursesw/curses.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ncursesw/term.h>
#include "cfg.h"
#include "screen.h"
#include "winch.h"
/* init curses full screen mode;
* includes initializing color mode and color pairs */
void start_curses(void)
{
initscr(); /* init curses */
/* set options */
if((cfg.color && start_color()==ERR)
|| cbreak()==ERR /* unbuffered input */
|| noecho()==ERR /* no key echo */
|| intrflush(stdscr, FALSE)==ERR /* don't flush output on signals */
|| keypad(stdscr, TRUE)==ERR /* translate function key sequences */
) {
endwin();
fprintf(stderr, "error initializing curses in fullscreen mode\n");
exit(1);
}
nonl(); /* don't mess with cr on keyboard input */
idlok(stdscr, TRUE); /* allow hardware scrolling */
/* prepare color pairs */
if(cfg.color) {
int pair; /* currently processed color pair */
for(pair=1; pair<64; ++pair) { /* 8x8 color pairs (all combinations of fg and bg color); pair 0 is hard-wired (to white on black instead of black on black) */
int fg, bg;
fg=(pair+7)%8; bg=pair/8; /* fg colorspace rotated, so white on black will be mapped to pair 0 */
if(!cfg.force_colors) {
if(use_default_colors()!=ERR) { /* can use default colors */
if(bg==COLOR_BLACK)
bg=-1; /* use terminal default */
if(fg==COLOR_WHITE)
fg=-1;
}
}
if(init_pair(pair, fg, bg)==ERR) { /* set foreground and background of pair */
endwin();
fprintf(stderr, "error initializing curses in fullscreen mode (can't set color pair %d)\n", pair);
exit(1);
}
}
if(cfg.force_colors)
bkgdset(COLOR_PAIR(0));
}
}
/* set screen attributes (color, bold)
* (standard colors for white foreground/black background are handled in init) */
void set_color(color)
int color;
{
int attrs=A_NORMAL;
int fg=(color+1)&0x07; /* foreground color */
int bg=(color&0x70)>>4; /* background */
if(!cfg.color)
return;
/* prepare attributes */
if(color&0x80) { /* bright background */
if(cfg.inverse_bold) { /* can obtain bright background only with reverse video */
attrs|=A_BOLD|A_REVERSE; /* set bright background (reversed bright foreground) */
fg^=bg; bg^=fg; fg^=bg; /* swap */
bg=(bg-1)&7; fg=(fg+1)&7; /* undo color rotation for new background (old forground) and apply to new forground instead */
} else /* can set bright background directly */
attrs|=A_BLINK;
}
if(color&0x08) /* bright foreground */
attrs|=A_BOLD;
attrs|=COLOR_PAIR(bg<<3|fg);
attrset(attrs);
}
/* leave curses full screen mode (possibly temporarily) */
void end_fullscreen(void)
{
/* free bottom line (scroll one line) */
move(0,0);
deleteln();
refresh();
endwin();
enable_winch(); /* allow SIGWINCH outside fullscreen mode, so it can be handled by readline() (curses will adapt when restarting fullscreen) */
}
/* terminal control sequences */
static char *setaf; /* foreground color */
static char *setab; /* background color */
/* init curses (not full screen) and read some control sequence strings
* return screen width */
int init_curses(void)
{
int width;
if(setupterm(NULL, 1, NULL)==ERR) { /* init */
fprintf(stderr, "Error initializing curses in raw mode.\n");
exit(1);
}
width=tigetnum("cols");
if(width<=0) {
fprintf(stderr, "Error initializing curses in raw mode. (Can't get screen size.)\n");
exit(1);
}
if(cfg.color) {
setaf=tigetstr("setaf"); /* set foreground color */
setab=tigetstr("setab"); /* background color */
if(setaf==NULL || setab==NULL) {
cfg.color=0;
fprintf(stderr, "Can't get color capabilities -- starting in monochrome mode.\n\nIf this is what you want, use --monochrome option to suppress this warning. Otherwise, please check your $TERM environment variable. (See README for details.)\n\nPress <return> to continue.\n");
getchar();
}
/* determine whether terminal needs workaround to display bright background colors */
if(cfg.inverse_bold < 0) { /* not forced by command line option -> guess */
char *term;
term=getenv("TERM");
if(term==NULL)
term="";
cfg.inverse_bold=(strstr(term, "xterm")!=NULL); /* xterm needs it */
}
}
return width;
}
/* set screen attributes (color, bold) in raw mode
* color white is not set; standard attributes are kept instead;
* likewise for black background */
void set_color_raw(color)
int color;
{
chtype attrs=A_NORMAL;
int fg=color&0x07; /* foreground color */
int bg=(color&0x70)>>4; /* background */
if(!cfg.color)
return;
/* prepare attributes */
if(color&0x80) { /* bright background */
if(cfg.inverse_bold) { /* can obtain bright background only with reverse video */
attrs|=A_BOLD|A_REVERSE; /* set bright background (reversed bright foreground) */
fg^=bg; bg^=fg; fg^=bg; /* swap */
} else /* can set bright background directly */
attrs|=A_BLINK;
}
if(color&0x08) /* bright foreground */
attrs|=A_BOLD;
/* set */
vidattr(attrs);
if(bg!=COLOR_BLACK) /* not black (or force_colors) -> set background */
putp(tparm(setab, bg));
if(fg!=COLOR_WHITE) /* not white (or force_colors) -> set color */
putp(tparm(setaf, fg));
}
/* reset screen attributes to default */
void reset_color_raw(void)
{
if(!cfg.color)
return;
vidattr(A_BOLD); vidattr(A_NORMAL); /* force reset (curses doesn't know about color changes in raw mode...) */
}
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