better support for win7

libs/scrap/src/common/dxgi.rs

@@ -62,13 +62,23 @@ pub struct Display(dxgi::Display);
 
 impl Display {
     pub fn primary() -> io::Result<Display> {
-        match dxgi::Displays::new()?.next() {
-            Some(inner) => Ok(Display(inner)),
-            None => Err(NotFound.into()),
-        }
+        // not implemented yet
+        Err(NotFound.into())
     }
 
     pub fn all() -> io::Result<Vec<Display>> {
+        let tmp = Self::all_().unwrap_or(Default::default());
+        if tmp.is_empty() {
+            println!("Display got from gdi");
+            return Ok(dxgi::Displays::get_from_gdi()
+                .drain(..)
+                .map(Display)
+                .collect::<Vec<_>>());
+        }
+        Ok(tmp)
+    }
+
+    fn all_() -> io::Result<Vec<Display>> {
         Ok(dxgi::Displays::new()?.map(Display).collect::<Vec<_>>())
     }
 
@@ -92,13 +102,12 @@ impl Display {
         self.0.is_online()
     }
 
-    pub fn origin(&self) -> (usize, usize) {
-        let o = self.0.origin();
-        (o.0 as usize, o.1 as usize)
+    pub fn origin(&self) -> (i32, i32) {
+        self.0.origin()
     }
 
-    // to-do: not found primary display api for dxgi
     pub fn is_primary(&self) -> bool {
-        self.name() == Self::primary().unwrap().name()
+        // https://docs.microsoft.com/en-us/windows/win32/api/wingdi/ns-wingdi-devmodea
+        self.origin() == (0, 0)
     }
 }

libs/scrap/src/common/quartz.rs

@@ -114,9 +114,9 @@ impl Display {
         self.0.is_online()
     }
 
-    pub fn origin(&self) -> (usize, usize) {
+    pub fn origin(&self) -> (i32, i32) {
         let o = self.0.bounds().origin;
-        (o.x as usize, o.y as usize)
+        (o.x as _, o.y as _)
     }
 
     pub fn is_primary(&self) -> bool {

libs/scrap/src/common/x11.rs

@@ -68,7 +68,7 @@ impl Display {
         self.0.rect().h as usize
     }
 
-    pub fn origin(&self) -> (usize, usize) {
+    pub fn origin(&self) -> (i32, i32) {
         let r = self.0.rect();
         (r.x as _, r.y as _)
     }