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use std::ffi::CString;
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use x11::xft::{XftColor, XftDraw, XftDrawStringUtf8, XftFont, XftFontOpenName};
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use x11::xlib::{Colormap, Display, Drawable, Visual};
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use x11::xrender::XRenderColor;
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use crate::errors::X11Error;
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pub struct Font {
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xft_font: *mut XftFont,
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display: *mut Display,
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}
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impl Font {
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pub fn new(display: *mut Display, screen: i32, font_name: &str) -> Result<Self, X11Error> {
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let font_name_cstr =
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CString::new(font_name).map_err(|_| X11Error::FontLoadFailed(font_name.to_string()))?;
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let xft_font = unsafe { XftFontOpenName(display, screen, font_name_cstr.as_ptr()) };
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if xft_font.is_null() {
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return Err(X11Error::FontLoadFailed(font_name.to_string()));
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}
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Ok(Font { xft_font, display })
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}
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pub fn height(&self) -> u16 {
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unsafe {
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let font = &*self.xft_font;
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font.height as u16
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}
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}
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pub fn ascent(&self) -> i16 {
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unsafe {
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let font = &*self.xft_font;
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font.ascent as i16
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}
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}
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pub fn text_width(&self, text: &str) -> u16 {
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unsafe {
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let mut extents = std::mem::zeroed();
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x11::xft::XftTextExtentsUtf8(
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self.display,
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self.xft_font,
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text.as_ptr(),
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text.len() as i32,
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&mut extents,
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);
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extents.width
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}
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}
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}
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impl Drop for Font {
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fn drop(&mut self) {
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unsafe {
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if !self.xft_font.is_null() {
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x11::xft::XftFontClose(self.display, self.xft_font);
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}
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}
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}
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}
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pub struct FontDraw {
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xft_draw: *mut XftDraw,
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}
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impl FontDraw {
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pub fn new(
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display: *mut Display,
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drawable: Drawable,
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visual: *mut Visual,
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colormap: Colormap,
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) -> Result<Self, X11Error> {
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let xft_draw = unsafe { x11::xft::XftDrawCreate(display, drawable, visual, colormap) };
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if xft_draw.is_null() {
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return Err(X11Error::DrawCreateFailed);
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}
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Ok(FontDraw { xft_draw })
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}
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pub fn draw_text(&self, font: &Font, color: u32, x: i16, y: i16, text: &str) {
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let red = ((color >> 16) & 0xFF) as u16;
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let green = ((color >> 8) & 0xFF) as u16;
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let blue = (color & 0xFF) as u16;
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let render_color = XRenderColor {
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red: red << 8 | red,
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green: green << 8 | green,
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blue: blue << 8 | blue,
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alpha: 0xFFFF,
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};
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let mut xft_color: XftColor = unsafe { std::mem::zeroed() };
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unsafe {
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x11::xft::XftColorAllocValue(
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x11::xft::XftDrawDisplay(self.xft_draw),
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x11::xft::XftDrawVisual(self.xft_draw),
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x11::xft::XftDrawColormap(self.xft_draw),
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&render_color,
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&mut xft_color,
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);
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XftDrawStringUtf8(
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self.xft_draw,
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&xft_color,
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font.xft_font,
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x as i32,
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y as i32,
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text.as_ptr(),
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text.len() as i32,
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);
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x11::xft::XftColorFree(
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x11::xft::XftDrawDisplay(self.xft_draw),
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x11::xft::XftDrawVisual(self.xft_draw),
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x11::xft::XftDrawColormap(self.xft_draw),
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&mut xft_color,
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);
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}
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}
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pub fn flush(&self) {
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unsafe {
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let display = x11::xft::XftDrawDisplay(self.xft_draw);
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x11::xlib::XFlush(display);
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}
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}
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}
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impl Drop for FontDraw {
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fn drop(&mut self) {
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unsafe {
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if !self.xft_draw.is_null() {
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x11::xft::XftDrawDestroy(self.xft_draw);
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}
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}
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}
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}
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