I finally found a sliver of time to do something I've been itchin' to try. I wrote a very small app that uses libXft and freetype2 to draw anti-aliased text in a X window. It is pure X and doesn't require Xt or any toolkit like Motif, GTK+ or Qt. Basically, Keith Packard has replaced the core X font calls with equivalents. Here's the little app, which I post here because there doesn't seem to be anything like it on the web. The closest is here:
http://www.keithp.com/~keithp/render/Xft.tutorial
xfthello.c
and the (GNU) Makefile that will built it.
Note: you have to uncomment one line if you want to build it on the Mac. Also, it builds two versions. The old X11 style fonts (xhello) and the new Xft anti-alised fonts (xfthello). Have a peek at the results.
What am I going to do with this newly acquired knowledge?....Only time will let!
Cheers!
xfthello.c
Code: Select all
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#ifdef HAVE_XFT
#include <Xft/Xft.h>
#endif
#define DEFAULT_BDWIDTH 1 /* border width */
#ifdef HAVE_XFT
char *text = "Hello Xft";
#else
char *text = "Hello X11";
#endif
Display *dpy;
int main( int argc, char *argv[] )
{
int ytext, wtext, htext, gravity, geo_mask;
int Done = 0, highlight = 0, force_expose = 0;
XSizeHints xsh;
XWMHints xwmh;
unsigned long fgpix, bgpix;
Window mainW;
XSetWindowAttributes xswa;
#ifdef HAVE_XFT
XftFont *font;
XftDraw *xftdraw;
XRenderColor xrcolor;
XftColor xftcolor, hlcolor;
XGlyphInfo extents;
#else
GC gc;
XGCValues gcvals;
XFontStruct *font;
#endif
XEvent event;
char user_geo[80];
/* open connection to X display */
dpy = XOpenDisplay( NULL );
/* set up font */
#ifdef HAVE_XFT
font = XftFontOpenName( dpy, DefaultScreen( dpy ), "morpheus-18" );
#else
font = XLoadQueryFont( dpy, "-*-helvetica-medium-r-normal--20-*-*-*-p-100-iso8859-1" );
#endif
/* colors */
fgpix = BlackPixel( dpy, DefaultScreen( dpy ) );
bgpix = WhitePixel( dpy, DefaultScreen( dpy ) );
/* position and size of top window (XSizeHints) */
#ifdef HAVE_XFT
XftTextExtents8( dpy, font, (XftChar8 *)text, strlen(text), &extents );
ytext = extents.height - extents.y;
wtext = extents.width - extents.x;
#else
ytext = font->max_bounds.ascent + font->max_bounds.descent;
wtext = font->max_bounds.width / 2 + XTextWidth( font, text, strlen(text) + 4 );
#endif
htext = ytext + 4;
xsh.flags = ( PPosition | PSize | PMinSize );
xsh.height = htext + 10;
xsh.min_height = xsh.height;
xsh.width = wtext;
xsh.min_width = xsh.width;
xsh.x = 50;
xsh.y = 50;
/* construct a geometry string */
sprintf( user_geo, "%dx%d+%d+%d", xsh.width, xsh.height, xsh.x, xsh.y );
/* process geometry specification */
geo_mask = XWMGeometry( dpy, DefaultScreen(dpy), user_geo, NULL/*def_geo*/,
DEFAULT_BDWIDTH, &xsh, &xsh.x, &xsh.y, &xsh.width, &xsh.height,
&gravity );
/* check geometry bitmask and set size hints */
if ( geo_mask & (XValue|YValue) ) xsh.flags |= USPosition;
if ( geo_mask & (WidthValue|HeightValue) ) xsh.flags |= USSize;
/* create top level window */
mainW = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), xsh.x, xsh.y,
xsh.width, xsh.height, DEFAULT_BDWIDTH, fgpix, bgpix );
/* set window manager properties */
XSetStandardProperties( dpy, mainW, "xhello", "xhello", None, argv, argc, &xsh );
/* set window manager hints */
xwmh.flags = (InputHint|StateHint);
xwmh.input = False;
xwmh.initial_state = NormalState;
XSetWMHints( dpy, mainW, &xwmh );
#ifdef HAVE_XFT
/* Xft draw context */
xftdraw = XftDrawCreate( dpy, mainW, DefaultVisual(dpy,DefaultScreen(dpy)),
DefaultColormap( dpy, DefaultScreen(dpy) ) );
/* Xft text color */
xrcolor.red = 0x0;
xrcolor.green = 0x0;
xrcolor.blue = 0x0;
xrcolor.alpha = 0xffff;
XftColorAllocValue( dpy, DefaultVisual(dpy,DefaultScreen(dpy)),
DefaultColormap( dpy, DefaultScreen(dpy) ), &xrcolor, &xftcolor );
/* Xft highlight color */
xrcolor.red = 0xafff;
xrcolor.green = 0xafff;
xrcolor.blue = 0xffff;
xrcolor.alpha = 0xffff;
XftColorAllocValue( dpy, DefaultVisual(dpy,DefaultScreen(dpy)),
DefaultColormap( dpy, DefaultScreen(dpy) ), &xrcolor, &hlcolor );
#else
/* create graphics context */
gcvals.font = font->fid;
gcvals.foreground = fgpix;
gcvals.background = bgpix;
gc = XCreateGC( dpy, mainW, (GCFont|GCForeground|GCBackground), &gcvals );
#endif
/* set window attributes */
xswa.colormap = DefaultColormap( dpy, DefaultScreen(dpy) );
xswa.bit_gravity = CenterGravity;
XChangeWindowAttributes( dpy, mainW, (CWColormap|CWBitGravity), &xswa );
/* select inputs */
XSelectInput( dpy, mainW, ExposureMask|ButtonPressMask|EnterWindowMask|LeaveWindowMask );
/* make window visible */
XMapWindow( dpy, mainW );
printf("click on the window to exit\n");
/* retrieve and process events */
while ( !Done ) {
XNextEvent( dpy, &event );
if ( event.xany.window == mainW ) {
switch ( event.type ) {
case EnterNotify:
case LeaveNotify:
if ( event.type==EnterNotify) highlight = 1;
else highlight = 0;
force_expose = 1;
case Expose:
if ( event.xexpose.count == 0 || force_expose ) {
int x, y, itmp;
unsigned int w, h, utmp;
Window wtmp;
if ( XGetGeometry( dpy, mainW, &wtmp, &itmp, &itmp, &w, &h, &utmp, &utmp )==0 )
break;
XClearWindow( dpy, mainW );
#ifdef HAVE_XFT
x = ( w - extents.width ) / 2;
y = htext + ( h - htext + extents.height )/2;
if (highlight) XftDrawRect( xftdraw, &hlcolor, x, y-extents.height, wtext, extents.height );
XftDrawString8( xftdraw, &xftcolor, font, x, y, (XftChar8 *)text, strlen(text) );
#else
x = ( w - XTextWidth( font, text, strlen(text) ) ) / 2;
y = htext + ( h - htext + font->max_bounds.ascent - font->max_bounds.descent )/2;
XDrawString( dpy, mainW, gc, x, y, text, strlen(text) );
#endif
force_expose = 0;
}
break;
case ButtonPress:
Done = 1;
printf("good-bye!\n");
break;
default:
break;
}
}
}
/* close connection to display */
#ifdef HAVE_XFT
XftDrawDestroy( xftdraw );
XftColorFree( dpy, DefaultVisual(dpy,DefaultScreen(dpy)),
DefaultColormap( dpy, DefaultScreen(dpy) ), &xftcolor );
XftColorFree( dpy, DefaultVisual(dpy,DefaultScreen(dpy)),
DefaultColormap( dpy, DefaultScreen(dpy) ), &hlcolor );
#else
XFreeGC( dpy, gc );
#endif
XDestroyWindow( dpy, mainW );
XCloseDisplay( dpy );
return(0);
}
and the (GNU) Makefile that will built it.
Code: Select all
SHELL = /bin/sh
CFLAGS = -O0 -g -Wall
CPPFLAGS = -I. -I/usr/X11R6/include -L/usr/X11R6/lib
XFTFLAGS = -DHAVE_XFT -I/usr/nekoware/include -I/usr/nekoware/include/freetype2 -I/usr/nekoware/include/X11 -L/usr/nekoware/lib -Wl,-rpath -Wl,/usr/nekoware/lib
# uncomment for Apple OS X
#XFTFLAGS = -DHAVE_XFT -I/usr/X11R6/include/X11 -I/usr/X11R6/include/freetype2
LDFLAGS = -L. -L..
LIBS = -lX11
XFTLIBS = -lXft
%.o: %.c
$(CC) -c $(CFLAGS) $(CPPFLAGS) $(XM) -o $@ $<
.PHONY: all
all: xhello xfthello
xhello: $(OBJS) xhello.c
$(CC) $(CFLAGS) $(CPPFLAGS) xhello.c -o xhello $(LDFLAGS) $(LIBS);
xfthello: $(OBJS) xhello.c
$(CC) $(CFLAGS) $(CPPFLAGS) $(XFTFLAGS) xhello.c -o xfthello $(LDFLAGS) $(XFTLIBS) $(LIBS);
.PHONY: clean
clean:
rm -f ./*.o; rm -f ./xhello ./xfthello;
Note: you have to uncomment one line if you want to build it on the Mac. Also, it builds two versions. The old X11 style fonts (xhello) and the new Xft anti-alised fonts (xfthello). Have a peek at the results.
What am I going to do with this newly acquired knowledge?....Only time will let!
Cheers!
.
J5600, 2 x Mac, 3 x SUN, Alpha DS20E, Alpha 800 5/550, 3 x RS/6000, Amiga 4000 VideoToaster, Amiga4000 -030, 733MHz Sam440 AmigaOS 4.1 update 1.
Tandem Himalaya S-Series Nonstop S72000 ServerNet.
Or, all too often, they are the times I wail and lament that I'm not more consistent in capturing/documenting things as I go...
...
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