You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: glyph.rs
    path of file: ./repos/emacs-ng/rust_src/crates/gl-renderer/src
    
    the code of the file until where you have to start completion: use crate::emacs::number::LNumber;
use crate::image::ImageRef;
use emacs::lglyph::LGlyph;
use emacs::lglyph::LGlyphString;
use emacs::lisp::LispObject;
use euclid::Scale;

use webrender::{self, api::units::*, api::*};

use crate::frame::FrameExtGlRendererCommon;

use font::{FontInfo, FontInfoRef};

use emacs::{

    
    fn automatic_composite_glyph_instances(self) -> Vec<GlyphInstance> {
        let mut instances: Vec<GlyphInstance> = vec![];
        let lgstring = self.get_lgstring();
        let mut composite_lglyph = |lglyph: LispObject, x: i32, y: i32| {
            let code = lglyph.lglyph_code().as_fixnum_or_error();
            let index: webrender::api::GlyphIndex = code.try_into().unwrap();
            let glyph_instance = GlyphInstance {
                index,
                point: LayoutPoint::new(x as f32, y as f32),
            };
            log::warn!("automatic composite glyph instance {glyph_instance:?}");
            instances.push(glyph_instance);
        };

        let mut x = self.x() as u32;

        let y = self.ybase;
        let mut width = 0;

        let cmp_from = self.cmp_from;
        let cmp_to = self.cmp_to;

        let mut i = cmp_from;
        let mut j = cmp_from;

        for n in cmp_from..cmp_to {
            let lglyph = lgstring.lgstring_glyph(n as u32);
            if lglyph.lglyph_adjustment().is_nil() {
                width += lglyph.lglyph_width().xfixnum();
            } else {
                if j < i {
                    composite_lglyph(lglyph, x as i32, y);
                    x += width as u32;
                }
                let xoff = lglyph.lglyph_xoff() as u32;
                let yoff = lglyph.lglyph_yoff() as u32;
                let wadjust = lglyph.lglyph_wadjust() as u32;
                composite_lglyph(lglyph, x as i32 + xoff as i32, y + yoff as i32);

                x += wadjust;
                j = i + 1;
                width = 0;
            }
            i = i + 1;
        }
        if j < i {
            for n in j..i {
                let lglyph = lgstring.lgstring_glyph(n as u32);
                composite_lglyph(lglyph, x as i32, y);
                x += width as u32;
            }
        }

        instances
    }