#include <X11/extensions/Xrender.h>

static char glyph_data[] = {
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};

int main()
{
	Display *dpy = XOpenDisplay(NULL);
	XSetWindowAttributes attr;
	Window w;
	Picture pict;
	Picture grad;
	XLinearGradient gradient;
	XFixed stops[2];
	XRenderColor colors[2];
	GlyphSet glyphs;
	Glyph g = 0x43;
	XGlyphInfo ginfo;

	gradient.p1.x = 0;
	gradient.p1.y = 0;
	gradient.p2.x = 100 << 16;
	gradient.p2.y = 100 << 16;
	stops[0] = 0;
	stops[1] = 1 << 16;
	colors[0].red  = colors[0].green = 0x8000;
	colors[0].blue = colors[0].alpha = 0xffff;
	colors[1].blue = colors[1].green = 0x8000;
	colors[1].red  = colors[1].alpha = 0xffff;
	ginfo.width = 9;
	ginfo.height = 11;
	ginfo.x = 0;
	ginfo.y = 0;
	ginfo.xOff = 0;
	ginfo.yOff = 0;
	attr.override_redirect = True;
	attr.event_mask = ExposureMask;

	grad = XRenderCreateLinearGradient(dpy, &gradient, &stops[0], &colors[0], 2);
	glyphs = XRenderCreateGlyphSet(dpy, XRenderFindStandardFormat(dpy, PictStandardA8));
	XRenderAddGlyphs(dpy, glyphs, &g, &ginfo, 1, glyph_data, sizeof(glyph_data));

	w = XCreateWindow(dpy, DefaultRootWindow(dpy),
			0, 0, 100, 100, 0,
			DefaultDepth(dpy, 0), InputOutput,
			DefaultVisual(dpy, 0),
			CWOverrideRedirect | CWEventMask,
			&attr);
	pict = XRenderCreatePicture(dpy, w,
			XRenderFindVisualFormat(dpy, DefaultVisual(dpy, 0)),
			0, NULL);

	XMapWindow(dpy, w);

	while (True) {
		XEvent e;
		XNextEvent(dpy, &e);

		if (e.type == Expose) {
			XRenderComposite(dpy, PictOpSrc, grad, 0, pict, 0, 0, 0, 0,
					0, 0, 100, 100);
			XRenderCompositeString8(dpy, PictOpSrc, grad, pict, NULL,
					glyphs, 30, 30, 30, 30, "C", 1);
		}
	}
}