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implement Window::hidpi_factor() for X11.

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Yasuhiro Fujii 2017-03-03 21:25:26 +09:00
parent 4c6e4e827a
commit d72a345878
1 changed files with 8 additions and 2 deletions
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10
src/api/x11/window.rs
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@ -956,9 +956,15 @@ impl Window {
} }
} }
#[inline]
pub fn hidpi_factor(&self) -> f32 { pub fn hidpi_factor(&self) -> f32 {
1.0 unsafe {
let x_px = (self.x.display.xlib.XDisplayWidth)(self.x.display.display, self.x.screen_id);
let y_px = (self.x.display.xlib.XDisplayHeight)(self.x.display.display, self.x.screen_id);
let x_mm = (self.x.display.xlib.XDisplayWidthMM)(self.x.display.display, self.x.screen_id);
let y_mm = (self.x.display.xlib.XDisplayHeightMM)(self.x.display.display, self.x.screen_id);
let ppmm = ((x_px as f32 * y_px as f32) / (x_mm as f32 * y_mm as f32)).sqrt();
((ppmm * (12.0 * 25.4 / 96.0)).round() / 12.0).max(1.0) // quantize with 1/12 step size.
}
} }
pub fn set_cursor_position(&self, x: i32, y: i32) -> Result<(), ()> { pub fn set_cursor_position(&self, x: i32, y: i32) -> Result<(), ()> {