This isn't important, but I am puzzled by why cargo fmt wants to put a load of parameters on different lines here, but in the previous function further up it is quite happy to have lots on the same line.

    /// Draw image on page.
    pub fn draw(&self, page: &mut Page, x: f32, y: f32, scale: f32) {
        let obj = self.obj;
        let w = (self.width as f32) * scale;
        let h = (self.height as f32) * scale;
        page.xobjs.insert(obj);
        let _ = wb!(
            &mut page.os,
            b"\nq {} 0 0 {} {} {} cm /X{} Do Q",
            w,
            h,
            x,
            y,
            obj
        );
    }

The function before:

        let _ = wb!(
            &mut w.b,
            b"<</Type/XObject/Subtype/Image/Width {}/Height {}/ColorSpace{}/BitsPerComponent {}/Length {}{}>>stream\n",
            s.width, s.height, s.color_space, s.bits_per_component, s.data.len(), s.other
        );

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