enable retina scale factor (#7269)

* enable retina scale factor

* enabled only when there are only one video service running
* scale mouse event
* scale cursor position
* scale remote menu display button
* adjust resolution

Signed-off-by: 21pages <pages21@163.com>

* Update server.rs

---------

Signed-off-by: 21pages <pages21@163.com>
Co-authored-by: RustDesk <71636191+rustdesk@users.noreply.github.com>

flutter/lib/desktop/widgets/remote_toolbar.dart

@@ -759,15 +759,18 @@ class _MonitorMenu extends StatelessWidget {
       final children = <Widget>[];
       for (var i = 0; i < pi.displays.length; i++) {
         final d = pi.displays[i];
-        final fontSize = (d.width * scale < d.height * scale
-                ? d.width * scale
-                : d.height * scale) *
+        double s = d.scale;
+        int dWidth = d.width.toDouble() ~/ s;
+        int dHeight = d.height.toDouble() ~/ s;
+        final fontSize = (dWidth * scale < dHeight * scale
+                ? dWidth * scale
+                : dHeight * scale) *
             0.65;
         children.add(Positioned(
           left: (d.x - rect.left) * scale + startX,
           top: (d.y - rect.top) * scale + startY,
-          width: d.width * scale,
-          height: d.height * scale,
+          width: dWidth * scale,
+          height: dHeight * scale,
           child: Container(
             decoration: BoxDecoration(
               border: Border.all(
@@ -1287,7 +1290,9 @@ class _ResolutionsMenuState extends State<_ResolutionsMenu> {
     if (lastGroupValue == _kCustomResolutionValue) {
       _groupValue = _kCustomResolutionValue;
     } else {
-      _groupValue = '${rect?.width.toInt()}x${rect?.height.toInt()}';
+      var scale = pi.scaleOfDisplay(pi.currentDisplay);
+      _groupValue =
+          '${(rect?.width ?? 0) ~/ scale}x${(rect?.height ?? 0) ~/ scale}';
     }
   }
 
@@ -1386,6 +1391,11 @@ class _ResolutionsMenuState extends State<_ResolutionsMenu> {
     if (display == null) {
       return Offstage();
     }
+    if (!resolutions.any((e) =>
+        e.width == display.originalWidth &&
+        e.height == display.originalHeight)) {
+      return Offstage();
+    }
     return Offstage(
       offstage: !showOriginalBtn,
       child: MenuButton(

flutter/lib/models/model.dart

@@ -138,21 +138,29 @@ class FfiModel with ChangeNotifier {
     sessionId = parent.target!.sessionId;
   }
 
-  Rect? globalDisplaysRect() => _getDisplaysRect(_pi.displays);
-  Rect? displaysRect() => _getDisplaysRect(_pi.getCurDisplays());
-  Rect? _getDisplaysRect(List<Display> displays) {
+  Rect? globalDisplaysRect() => _getDisplaysRect(_pi.displays, true);
+  Rect? displaysRect() => _getDisplaysRect(_pi.getCurDisplays(), false);
+  Rect? _getDisplaysRect(List<Display> displays, bool useDisplayScale) {
     if (displays.isEmpty) {
       return null;
     }
+    int scale(int len, double s) {
+      if (useDisplayScale) {
+        return len.toDouble() ~/ s;
+      } else {
+        return len;
+      }
+    }
+
     double l = displays[0].x;
     double t = displays[0].y;
-    double r = displays[0].x + displays[0].width;
-    double b = displays[0].y + displays[0].height;
+    double r = displays[0].x + scale(displays[0].width, displays[0].scale);
+    double b = displays[0].y + scale(displays[0].height, displays[0].scale);
     for (var display in displays.sublist(1)) {
       l = min(l, display.x);
       t = min(t, display.y);
-      r = max(r, display.x + display.width);
-      b = max(b, display.y + display.height);
+      r = max(r, display.x + scale(display.width, display.scale));
+      b = max(b, display.y + scale(display.height, display.scale));
     }
     return Rect.fromLTRB(l, t, r, b);
   }
@@ -476,6 +484,7 @@ class FfiModel with ChangeNotifier {
         int.tryParse(evt['original_width']) ?? kInvalidResolutionValue;
     newDisplay.originalHeight =
         int.tryParse(evt['original_height']) ?? kInvalidResolutionValue;
+    newDisplay._scale = _pi.scaleOfDisplay(display);
     _pi.displays[display] = newDisplay;
 
     if (!_pi.isSupportMultiUiSession || _pi.currentDisplay == display) {
@@ -890,6 +899,8 @@ class FfiModel with ChangeNotifier {
     d.cursorEmbedded = evt['cursor_embedded'] == 1;
     d.originalWidth = evt['original_width'] ?? kInvalidResolutionValue;
     d.originalHeight = evt['original_height'] ?? kInvalidResolutionValue;
+    double v = (evt['scale']?.toDouble() ?? 100.0) / 100;
+    d._scale = v > 1.0 ? v : 1.0;
     return d;
   }
 
@@ -2384,6 +2395,8 @@ class Display {
   bool cursorEmbedded = false;
   int originalWidth = kInvalidResolutionValue;
   int originalHeight = kInvalidResolutionValue;
+  double _scale = 1.0;
+  double get scale => _scale > 1.0 ? _scale : 1.0;
 
   Display() {
     width = (isDesktop || isWebDesktop)
@@ -2503,6 +2516,13 @@ class PeerInfo with ChangeNotifier {
       }
     }
   }
+
+  double scaleOfDisplay(int display) {
+    if (display >= 0 && display < displays.length) {
+      return displays[display].scale;
+    }
+    return 1.0;
+  }
 }
 
 const canvasKey = 'canvas';