Attachment 4493 Details for Bug 5745 – C source that segfaults because of this bug.

C source that segfaults because of this bug.

xftglyph.c (text/plain), 2.84 KB, created by Gautam Iyer on 2006-01-28 10:03:39 UTC

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Filename:

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Creator: Gautam Iyer

Created: 2006-01-28 10:03:39 UTC

Size: 2.84 KB

patch

obsolete

>#include <X11/Xlib.h>
>#include <stdlib.h>
>#include <unistd.h>
>
>#include <Xft.h>
>
>void die( char *s) {
>    puts( s);
>
>    exit(1);
>}
>
>void expose( Display *dpy, Window win,
>	XftDraw *xftdraw, XftColor *xftcolor, XftFont *xftfont)
>{
>    FT_UInt glyphs[16];
>    FT_UInt i,j;
>
>    XClearWindow( dpy, win);
>
>    for( i=0; i<16; i++) {
>	for( j=0; j<16; j++) {
>	    glyphs[j] = 16*i + j;
>	}
>	XftDrawGlyphs( xftdraw, xftcolor, xftfont, 10,
>		10 + xftfont->ascent + (xftfont->ascent + xftfont->descent)*i,
>		glyphs, 16);
>    }
>    // puts( "drew string");
>}
>
>int main(int argc, char *argv[]) {
>    Display	*dpy;
>    int		screen;
>    Window	win;
>
>    Visual	*visual;
>    Colormap	cmap;
>
>    XftFont	 *xftfont = NULL;
>    XftDraw	 *xftdraw;
>    XRenderColor color;
>    XftColor	 xftcolor;
>
>    XftPattern   *pattern = XftPatternCreate(), *match;
>    XftResult	 fr;
>
>    XEvent	ev;
>
>    char *fontname;
>
>    if( argc > 1)
>	fontname = argv[1];
>    else
>	fontname = "Bitstream Vera Sans Mono";
>
>    if( !(dpy = XOpenDisplay(0)) )
>	die("Could not open display");
>
>    screen = DefaultScreen( dpy);
>    visual = DefaultVisual( dpy, screen);
>    cmap   = DefaultColormap( dpy, screen);
>
>    XftPatternAddString(  pattern, XFT_FAMILY, fontname);
>    XftPatternAddInteger( pattern, XFT_SIZE, 20);
>    XftPatternAddInteger( pattern, XFT_SPACING, XFT_MONO);
>
>    match = XftFontMatch ( dpy, screen, pattern, &fr);
>    FcPatternPrint( match);
>
>    xftfont = XftFontOpenPattern( dpy, match);
>
>    /*
>     * BUG: XftFontOpenPattern() frees the pattern if it returns an already
>     * open font. Thus closing and re-opening the *same* font will cause a
>     * segfault when we attempt to acces the pattern match. Commenting the next
>     * two lines causes perfect execution.
>     */
>    XftFontClose( dpy, xftfont);
>    xftfont = XftFontOpenPattern( dpy, match);
>
>    XftPatternDestroy( match);
>    XftPatternDestroy( pattern);
>
>    win = XCreateSimpleWindow( dpy, DefaultRootWindow(dpy), 0, 0,
>	    20 + xftfont->max_advance_width * 16,
>	    20 + (xftfont->ascent + xftfont->descent) * 16,
>	    0, BlackPixel( dpy, screen), BlackPixel( dpy, screen));
>
>    xftdraw = XftDrawCreate(dpy, win, visual, cmap);
>
>    color.red	= 0xb000;
>    color.blue	= 0xb000;
>    color.green = 0xb000;
>    color.alpha = 0;
>
>    XftColorAllocValue(dpy, visual, cmap, &color, &xftcolor);
>
>    // Wait untill window is mapped
>    XSelectInput( dpy, win, ExposureMask | KeyPressMask );
>    XMapWindow( dpy, win);
>
>    while(1) {
>	XNextEvent( dpy, &ev);
>
>	if( ev.type == KeyPress && ev.xkey.keycode == 24 ) break;
>	else if( ev.type == Expose) {
>	    while( XCheckTypedWindowEvent( dpy, win, ExposureMask, &ev) );
>	    expose(dpy, win, xftdraw, &xftcolor, xftfont);
>	}
>    };
>    
>    XftColorFree( dpy, visual, cmap, &xftcolor);
>    XftDrawDestroy( xftdraw);
>    XftFontClose( dpy, xftfont);
>
>    XCloseDisplay(dpy);
>
>    puts( "Closed.");
>    return 0;
>}

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Attachments on bug 5745: 4493

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