change resolution, macos needs more tests

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/platform/mod.rs

@@ -44,6 +44,24 @@ pub fn breakdown_callback() {
     crate::input_service::release_device_modifiers();
 }
 
+#[cfg(not(any(target_os = "android", target_os = "ios")))]
+pub fn change_resolution(name: &str, width: usize, height: usize) -> ResultType<()> {
+    hbb_common::log::warn!("Change resolution of '{}' to ({},{})", name, width, height);
+
+    let cur_resolution = current_resolution(name)?;
+    // For MacOS
+    // to-do: Make sure the following comparison works. 
+    // For Linux
+    // Just run "xrandr", dpi may not be taken into consideration.
+    // For Windows
+    // dmPelsWidth and dmPelsHeight is the same to width and height
+    // Because this process is running in dpi awareness mode.
+    if cur_resolution.width as usize == width && cur_resolution.height as usize == height {
+        return Ok(());
+    }
+    change_resolution_directly(name, width, height)
+}
+
 // Android
 #[cfg(target_os = "android")]
 pub fn get_active_username() -> String {