x11-init.c

在x86平台上运行不可信任代码的sandbox。

	_x.gccopy	= xgc(_x.screenpm, -1, -1);
	_x.gcsimplesrc 	= xgc(_x.screenpm, FillStippled, -1);
	_x.gczero	= xgc(_x.screenpm, -1, -1);
	_x.gcreplsrc	= xgc(_x.screenpm, FillTiled, -1);

	pmid = XCreatePixmap(_x.display, _x.drawable, 1, 1, 1);
	_x.gcfill0	= xgc(pmid, FillSolid, 0);
	_x.gccopy0	= xgc(pmid, -1, -1);
	_x.gcsimplesrc0	= xgc(pmid, FillStippled, -1);
	_x.gczero0	= xgc(pmid, -1, -1);
	_x.gcreplsrc0	= xgc(pmid, FillTiled, -1);
	XFreePixmap(_x.display, pmid);

	termreplacescreenimage(_x.screenimage);
	return _x.screenimage;

err0:
	/*
	 * Should do a better job of cleaning up here.
	 */
	XCloseDisplay(_x.display);
	return nil;
}

int
_xsetlabel(char *label)
{
	XTextProperty name;

	/*
	 * Label and other properties required by ICCCCM.
	 */
	memset(&name, 0, sizeof name);
	if(label == nil)
		label = "pjw-face-here";
	name.value = (uchar*)label;
	name.encoding = XA_STRING;
	name.format = 8;
	name.nitems = strlen((char*)name.value);

	XSetWMProperties(
		_x.display,	/* display */
		_x.drawable,	/* window */
		&name,		/* XA_WM_NAME property */
		&name,		/* XA_WM_ICON_NAME property */
		nil,		/* XA_WM_COMMAND */
		0,		/* argc */
		nil,		/* XA_WM_NORMAL_HINTS */
		nil,		/* XA_WM_HINTS */
		nil	/* XA_WM_CLASSHINTS */
	);
	XFlush(_x.display);
	return 0;
}

/*
 * Create a GC with a particular fill style and XXX.
 * Disable generation of GraphicsExpose/NoExpose events in the GC.
 */
static XGC
xgc(XDrawable d, int fillstyle, int foreground)
{
	XGC gc;
	XGCValues v;

	memset(&v, 0, sizeof v);
	v.function = GXcopy;
	v.graphics_exposures = False;
	gc = XCreateGC(_x.display, d, GCFunction|GCGraphicsExposures, &v);
	if(fillstyle != -1)
		XSetFillStyle(_x.display, gc, fillstyle);
	if(foreground != -1)
		XSetForeground(_x.display, gc, 0);
	return gc;
}

/*
 * Initialize map with the Plan 9 rgbv color map.
 */
static void
plan9cmap(void)
{
	int r, g, b, cr, cg, cb, v, num, den, idx, v7, idx7;
	static int once;

	if(once)
		return;
	once = 1;

	for(r=0; r!=4; r++)
	for(g = 0; g != 4; g++)
	for(b = 0; b!=4; b++)
	for(v = 0; v!=4; v++){
		den=r;
		if(g > den)
			den=g;
		if(b > den)
			den=b;
		/* divide check -- pick grey shades */
		if(den==0)
			cr=cg=cb=v*17;
		else {
			num=17*(4*den+v);
			cr=r*num/den;
			cg=g*num/den;
			cb=b*num/den;
		}
		idx = r*64 + v*16 + ((g*4 + b + v - r) & 15);
		_x.map[idx].red = cr*0x0101;
		_x.map[idx].green = cg*0x0101;
		_x.map[idx].blue = cb*0x0101;
		_x.map[idx].pixel = idx;
		_x.map[idx].flags = DoRed|DoGreen|DoBlue;

		v7 = v >> 1;
		idx7 = r*32 + v7*16 + g*4 + b;
		if((v & 1) == v7){
			_x.map7to8[idx7][0] = idx;
			if(den == 0) { 		/* divide check -- pick grey shades */
				cr = ((255.0/7.0)*v7)+0.5;
				cg = cr;
				cb = cr;
			}
			else {
				num=17*15*(4*den+v7*2)/14;
				cr=r*num/den;
				cg=g*num/den;
				cb=b*num/den;
			}
			_x.map7[idx7].red = cr*0x0101;
			_x.map7[idx7].green = cg*0x0101;
			_x.map7[idx7].blue = cb*0x0101;
			_x.map7[idx7].pixel = idx7;
			_x.map7[idx7].flags = DoRed|DoGreen|DoBlue;
		}
		else
			_x.map7to8[idx7][1] = idx;
	}
}

/*
 * Initialize and install the rgbv color map as a private color map
 * for this application.  It gets the best colors when it has the
 * cursor focus.
 *
 * We always choose the best depth possible, but that might not
 * be the default depth.  On such "suboptimal" systems, we have to allocate an
 * empty color map anyway, according to Axel Belinfante.
 */
static int 
setupcmap(XWindow w)
{
	char buf[30];
	int i;
	u32int p, pp;
	XColor c;

	if(_x.depth <= 1)
		return 0;

	if(_x.depth >= 24) {
		if(_x.usetable == 0)
			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocNone); 

		/*
		 * The pixel value returned from XGetPixel needs to
		 * be converted to RGB so we can call rgb2cmap()
		 * to translate between 24 bit X and our color. Unfortunately,
		 * the return value appears to be display server endian 
		 * dependant. Therefore, we run some heuristics to later
		 * determine how to mask the int value correctly.
		 * Yeah, I know we can look at _x.vis->byte_order but 
		 * some displays say MSB even though they run on LSB.
		 * Besides, this is more anal.
		 */
		c = _x.map[19];	/* known to have different R, G, B values */
		if(!XAllocColor(_x.display, _x.cmap, &c)){
			werrstr("XAllocColor: %r");
			return -1;
		}
		p  = c.pixel;
		pp = rgb2cmap((p>>16)&0xff,(p>>8)&0xff,p&0xff);
		if(pp != _x.map[19].pixel) {
			/* check if endian is other way */
			pp = rgb2cmap(p&0xff,(p>>8)&0xff,(p>>16)&0xff);
			if(pp != _x.map[19].pixel){
				werrstr("cannot detect X server byte order");
				return -1;
			}

			switch(_x.chan){
			case RGB24:
				_x.chan = BGR24;
				break;
			case XRGB32:
				_x.chan = XBGR32;
				break;
			default:
				werrstr("cannot byteswap channel %s",
					chantostr(buf, _x.chan));
				break;
			}
		}
	}else if(_x.vis->class == TrueColor || _x.vis->class == DirectColor){
		/*
		 * Do nothing.  We have no way to express a
		 * mixed-endian 16-bit screen, so pretend they don't exist.
		 */
		if(_x.usetable == 0)
			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocNone);
	}else if(_x.vis->class == PseudoColor){
		if(_x.usetable == 0){
			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocAll); 
			XStoreColors(_x.display, _x.cmap, _x.map, 256);
			for(i = 0; i < 256; i++){
				_x.tox11[i] = i;
				_x.toplan9[i] = i;
			}
		}else{
			for(i = 0; i < 128; i++){
				c = _x.map7[i];
				if(!XAllocColor(_x.display, _x.cmap, &c)){
					werrstr("can't allocate colors in 7-bit map");
					return -1;
				}
				_x.tox11[_x.map7to8[i][0]] = c.pixel;
				_x.tox11[_x.map7to8[i][1]] = c.pixel;
				_x.toplan9[c.pixel] = _x.map7to8[i][0];
			}
		}
	}else{
		werrstr("unsupported visual class %d", _x.vis->class);
		return -1;
	}
	return 0;
}

void
flushmemscreen(Rectangle r)
{
	static Lock flushlock;

	if(up && !up->nlocks.ref && _x.nextscreenpm != _x.screenpm){
		qlock(&_x.screenlock);
		XSync(_x.display, False);
		XFreePixmap(_x.display, _x.screenpm);
		_x.screenpm = _x.nextscreenpm;
		qunlock(&_x.screenlock);
	}

	if(r.min.x >= r.max.x || r.min.y >= r.max.y)
		return;
	lock(&flushlock);
	XCopyArea(_x.display, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
		Dx(r), Dy(r), r.min.x, r.min.y);
	XFlush(_x.display);
	unlock(&flushlock);
}

void
_xexpose(XEvent *e)
{
	XExposeEvent *xe;
	Rectangle r;

	qlock(&_x.screenlock);
	if(_x.screenpm != _x.nextscreenpm){
		qunlock(&_x.screenlock);
		return;
	}
	xe = (XExposeEvent*)e;
	r.min.x = xe->x;
	r.min.y = xe->y;
	r.max.x = xe->x+xe->width;
	r.max.y = xe->y+xe->height;
	XCopyArea(_x.display, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
		Dx(r), Dy(r), r.min.x, r.min.y);
	XSync(_x.display, False);
	qunlock(&_x.screenlock);
}

int
_xdestroy(XEvent *e)
{
	XDestroyWindowEvent *xe;

	xe = (XDestroyWindowEvent*)e;
	if(xe->window == _x.drawable){
		_x.destroyed = 1;
		return 1;
	}
	return 0;
}

int
_xconfigure(XEvent *e)
{
	Rectangle r;
	XConfigureEvent *xe = (XConfigureEvent*)e;

	if(!fullscreen){
		int rx, ry;
		XWindow w;
		if(XTranslateCoordinates(_x.kmcon, _x.drawable, DefaultRootWindow(_x.display), 0, 0, &rx, &ry, &w))
			windowrect = Rect(rx, ry, rx+xe->width, ry+xe->height);
	}

	if(xe->width == Dx(_x.screenr) && xe->height == Dy(_x.screenr))
		return 0;
	r = Rect(0, 0, xe->width, xe->height);
	mouserect = r;

	qlock(&_x.screenlock);
	if(_x.screenpm != _x.nextscreenpm){
		XCopyArea(_x.display, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
			Dx(r), Dy(r), r.min.x, r.min.y);
		XSync(_x.display, False);
	}
	qunlock(&_x.screenlock);
	_x.newscreenr = r;
	return 1;
}

int
_xreplacescreenimage(void)
{
	Memimage *m;
	XDrawable pixmap;
	Rectangle r;

	r = _x.newscreenr;

	pixmap = XCreatePixmap(_x.display, _x.drawable, Dx(r), Dy(r), _x.depth);
	m = _xallocmemimage(r, _x.chan, pixmap);
	if(_x.nextscreenpm != _x.screenpm)
		XFreePixmap(_x.display, _x.nextscreenpm);
	_x.nextscreenpm = pixmap;
	_x.screenr = r;
	_x.screenimage = m;
	termreplacescreenimage(m);
	drawreplacescreenimage(m);
	_x.screenpm = _x.nextscreenpm;
	return 1;
}

static int
parsewinsize(char *s, Rectangle *r, int *havemin)
{
	char c, *os;
	int i, j, k, l;

	os = s;
	*havemin = 0;
	*r = Rect(0,0,0,0);
	if(!isdigit((uchar)*s))
		goto oops;
	i = strtol(s, &s, 0);
	if(*s == 'x'){
		s++;
		if(!isdigit((uchar)*s))
			goto oops;
		j = strtol(s, &s, 0);
		r->max.x = i;
		r->max.y = j;
		if(*s == 0)
			return 0;
		if(*s != '@')
			goto oops;

		s++;
		if(!isdigit((uchar)*s))
			goto oops;
		i = strtol(s, &s, 0);
		if(*s != ',' && *s != ' ')
			goto oops;
		s++;
		if(!isdigit((uchar)*s))
			goto oops;
		j = strtol(s, &s, 0);
		if(*s != 0)
			goto oops;
		*r = rectaddpt(*r, Pt(i,j));
		*havemin = 1;
		return 0;
	}

	c = *s;
	if(c != ' ' && c != ',')
		goto oops;
	s++;
	if(!isdigit((uchar)*s))
		goto oops;
	j = strtol(s, &s, 0);
	if(*s != c)
		goto oops;
	s++;
	if(!isdigit((uchar)*s))
		goto oops;
	k = strtol(s, &s, 0);
	if(*s != c)
		goto oops;
	s++;
	if(!isdigit((uchar)*s))
		goto oops;
	l = strtol(s, &s, 0);
	if(*s != 0)
		goto oops;
	*r = Rect(i,j,k,l);
	*havemin = 1;
	return 0;

oops:
	werrstr("bad syntax in window size '%s'", os);
	return -1;
}