XDrawString(), XDrawString16() - draw text characters
XDrawString (Display *display, Drawable d, GC gc, int x,
int y, char *string, int length)
XDrawString16 (Display *display, Drawable d, GC gc, int x,
int y, XChar2b *string, int length)
Each character image, as defined by the font in the GC, is treated as an additional mask for a fill operation on the drawable. The drawable is modified only where the font character has a bit set to 1. For fonts defined with 2-byte matrix indexing and used with XDrawString16(3), each byte is used as a byte2 with a byte1 of zero.
Both functions use these GC components: function, plane-mask, fill-style, font, subwindow-mode, clip-x-origin, clip-y-origin, and clip-mask. They also use these GC mode-dependent components: foreground, background, tile, stipple, tile-stipple-x-origin, and tile-stipple-y-origin.
XDrawString(3) and XDrawString16(3) can generate BadDrawable, BadGC, and BadMatch errors.
Xlib