make sure `pkg-config pangocairo --cflags --libs` prints something, otherwise some -dev packages should be installed given your distribution

demo.go

package main

// #cgo pkg-config: pangocairo
// #include <pango/pangocairo.h>
// void draw(const char *font, const char *text, const char *output) {
//   int width, height;
//   PangoFontDescription *font_description = pango_font_description_from_string(font);
//   {
//     cairo_surface_t *cairo_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 0, 0);
//     cairo_t *cr = cairo_create(cairo_surface);
//     PangoLayout *pango_layout = pango_cairo_create_layout(cr);
//     pango_layout_set_font_description(pango_layout, font_description);
//     pango_layout_set_text(pango_layout, text, -1);
//     pango_layout_set_auto_dir(pango_layout, 1);
//     pango_layout_get_pixel_size(pango_layout, &width, &height);
//     cairo_destroy(cr);
//     cairo_surface_destroy(cairo_surface);
//   }
//   {
//     cairo_surface_t *cairo_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
//     cairo_t *cr = cairo_create(cairo_surface);
//     PangoLayout *pango_layout = pango_cairo_create_layout(cr);
//     pango_layout_set_font_description(pango_layout, font_description);
//     pango_layout_set_text(pango_layout, text, -1);
//     pango_layout_set_auto_dir(pango_layout, 1);
//     cairo_set_source_rgba(cr, 0, 0, 0, 0);
//     cairo_rectangle(cr, 0, 0, width, height);
//     cairo_fill(cr);
//     cairo_set_source_rgb(cr, 1, 1, 1);
//     pango_cairo_show_layout(cr, pango_layout);
//     cairo_surface_write_to_png(cairo_surface, output);
//     cairo_surface_destroy(cairo_surface);
//     cairo_destroy(cr);
//   }
//   pango_font_description_free(font_description);
// }
import "C"
import "unsafe"

func main() {
	font := C.CString("Noto Naskh Arabic 600")
	defer C.free(unsafe.Pointer(font))

	text := C.CString("سلام")
	defer C.free(unsafe.Pointer(text))

	output := C.CString("out.png")
	defer C.free(unsafe.Pointer(output))

	C.draw(font, text, output)
}