Implement public API for high-DPI (#319)

* Implement public API for high-DPI #105

* Recover get_inner_size_points and get_inner_size_pixels and change their implementation assuming get_inner_size() returns size in pixels

* Update changelog for high-DPI changes

src/platform/linux/mod.rs

@@ -94,6 +94,11 @@ impl MonitorId {
             &MonitorId::Wayland(ref m) => m.get_position(),
         }
     }
+
+    #[inline]
+    pub fn get_hidpi_factor(&self) -> f32 {
+        1.0
+    }
 }
 
 impl Window {

src/platform/linux/wayland/context.rs

@@ -407,6 +407,11 @@ impl MonitorId {
         // if we reach here, this monitor does not exist any more
         (0,0)
     }
+
+    #[inline]
+    pub fn get_hidpi_factor(&self) -> f32 {
+        1.0
+    }
 }
 
 // a handler to release the ressources acquired to draw the initial white screen as soon as

src/platform/linux/x11/monitor.rs

@@ -101,4 +101,9 @@ impl MonitorId {
     pub fn get_position(&self) -> (u32, u32) {
         self.position
     }
+
+    #[inline]
+    pub fn get_hidpi_factor(&self) -> f32 {
+        1.0
+    }
 }

src/platform/linux/x11/window.rs

@@ -473,7 +473,7 @@ impl Window2 {
 
     #[inline]
     pub fn get_inner_size(&self) -> Option<(u32, u32)> {
-        self.get_geometry().map(|(_, _, w, h, _)| ((w as f32 / self.hidpi_factor()) as u32, (h as f32 / self.hidpi_factor()) as u32))
+        self.get_geometry().map(|(_, _, w, h, _)| (w, h))
     }
 
     #[inline]