src/x/font_context.rs


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use crate::x::*;

use std::sync::Arc;

use x11::xft::{ XftDraw, XftDrawCreate, XftDrawDestroy };
use xcb::{ Xid };


pub struct FontGraphicContext {
  display: Arc<Display>,
  context_state: *mut XftDraw,
}


impl FontGraphicContext {
  pub fn new(window: &Window) -> xcb::Result<FontGraphicContext> {
    let display = Arc::clone(window.display());
    let xlib_display = display.connection().get_xlib_display();

    let x_visual = unsafe {
      x11::xlib::XDefaultVisual(xlib_display, display.screen_index())
    };

    let colormap = window.screen().default_colormap();

    let context_state = unsafe {
      XftDrawCreate(xlib_display,
                    window.window_id().resource_id() as u64,
                    x_visual,
                    colormap.resource_id() as u64)
    };

    Ok(FontGraphicContext { display, context_state })
  }

  pub fn get_xft_draw(&self) -> *mut XftDraw {
    self.context_state
  }
}

impl Drop for FontGraphicContext {
  fn drop(&mut self) {
    unsafe { XftDrawDestroy(self.context_state) };
  }
}