Windows screen DPI autodetect

app/src/processing/app/Theme.java

@@ -122,7 +122,7 @@ static public int getScale() {
         return scale;
     } catch (NumberFormatException ignore) {
     }
-    return 100;
+    return BaseNoGui.getPlatform().getSystemDPI() * 100 / 96;
   }
 
   static public int scale(int size) {

arduino-core/src/processing/app/Platform.java

@@ -333,4 +333,9 @@ public void chmod(File file, int mode) throws IOException, InterruptedException
   public void fixSettingsLocation() throws Exception {
     //noop
   }
+
+  public int getSystemDPI() {
+    return 96;
+  }
+
 }

arduino-core/src/processing/app/windows/Platform.java

@@ -35,6 +35,10 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import com.sun.jna.Native;
+import com.sun.jna.Pointer;
+import com.sun.jna.win32.StdCallLibrary;
+import com.sun.jna.win32.W32APIOptions;
 
 public class Platform extends processing.app.Platform {
 
@@ -240,4 +244,54 @@ public void fixSettingsLocation() throws Exception {
 
     Files.move(oldSettingsFolder, settingsFolder.toPath());
   }
+
+  // Need to extend com.sun.jna.platform.win32.User32 to access
+  // Win32 function GetDpiForSystem()
+  interface ExtUser32 extends StdCallLibrary, com.sun.jna.platform.win32.User32 {
+    ExtUser32 INSTANCE = (ExtUser32) Native.loadLibrary("user32", ExtUser32.class, W32APIOptions.DEFAULT_OPTIONS);
+
+    public int GetDpiForSystem();
+
+    public int SetProcessDpiAwareness(int value);
+
+    public final int DPI_AWARENESS_INVALID = -1;
+    public final int DPI_AWARENESS_UNAWARE = 0;
+    public final int DPI_AWARENESS_SYSTEM_AWARE = 1;
+    public final int DPI_AWARENESS_PER_MONITOR_AWARE = 2;
+
+    public Pointer SetThreadDpiAwarenessContext(Pointer dpiContext);
+
+    public final Pointer DPI_AWARENESS_CONTEXT_UNAWARE = new Pointer(-1);
+    public final Pointer DPI_AWARENESS_CONTEXT_SYSTEM_AWARE = new Pointer(-2);
+    public final Pointer DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE = new Pointer(-3);
+  }
+
+  private static int detected = detectSystemDPI();
+
+  @Override
+  public int getSystemDPI() {
+    if (detected == -1)
+      return super.getSystemDPI();
+    return detected;
+  }
+
+  public static int detectSystemDPI() {
+    try {
+      ExtUser32.INSTANCE.SetProcessDpiAwareness(ExtUser32.DPI_AWARENESS_SYSTEM_AWARE);
+    } catch (Throwable e) {
+      // Ignore error
+    }
+    try {
+      ExtUser32.INSTANCE.SetThreadDpiAwarenessContext(ExtUser32.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE);
+    } catch (Throwable e) {
+      // Ignore error (call valid only on Windows 10)
+    }
+    try {
+      return ExtUser32.INSTANCE.GetDpiForSystem();
+    } catch (Throwable e) {
+      // DPI detection failed, fall back with default
+      System.out.println("DPI detection failed, fallback to 96 dpi");
+      return -1;
+    }
+  }
 }

build/build.xml

@@ -926,17 +926,17 @@
 
   <target name="download-launch4j-windows">
     <antcall target="unzip-with-ant-task">
-      <param name="archive_file" value="windows/launch4j-3.8-win32.zip"/>
-      <param name="archive_url" value="http://downloads.sourceforge.net/project/launch4j/launch4j-3/3.8/launch4j-3.8-win32.zip"/>
+      <param name="archive_file" value="windows/launch4j-3.9-win32.zip"/>
+      <param name="archive_url" value="http://downloads.sourceforge.net/project/launch4j/launch4j-3/3.9/launch4j-3.9-win32.zip"/>
       <param name="final_folder" value="windows/launcher/launch4j"/>
       <param name="dest_folder" value="windows/launcher/"/>
     </antcall>
   </target>
 
   <target name="download-launch4j-linux">
     <antcall target="untar">
-      <param name="archive_file" value="windows/launch4j-3.8-linux.tgz"/>
-      <param name="archive_url" value="http://downloads.sourceforge.net/project/launch4j/launch4j-3/3.8/launch4j-3.8-linux.tgz"/>
+      <param name="archive_file" value="windows/launch4j-3.9-linux.tgz"/>
+      <param name="archive_url" value="http://downloads.sourceforge.net/project/launch4j/launch4j-3/3.9/launch4j-3.9-linux.tgz"/>
       <param name="final_folder" value="windows/launcher/launch4j"/>
       <param name="dest_folder" value="windows/launcher/"/>
     </antcall>
@@ -1026,7 +1026,7 @@
 
     <copy todir="windows/work">
       <fileset dir="windows/launcher"
-	       includes="application.ico, config.xml, config_debug.xml, arduino.l4j.ini"/>
+	       includes="application.ico, config.xml, config_debug.xml, arduino.l4j.ini, wrapper-manifest.xml"/>
     </copy>
     <launch4j configFile="windows/work/config.xml" fileVersion="${revision}.0" txtFileVersion="${revision}" productVersion="${revision}.0" txtProductVersion="${revision}"/>
     <launch4j configFile="windows/work/config_debug.xml" fileVersion="${revision}.0" txtFileVersion="${revision}" productVersion="${revision}.0" txtProductVersion="${revision}"/>

build/windows/launch4j-3.9-linux.tgz.sha

@@ -0,0 +1 @@
+9d4c377af0149389da9ad3c3f1394fc5a655f540

build/windows/launch4j-3.9-win32.zip.sha

@@ -0,0 +1 @@
+da6645d030137672647f576c8358427bc663282e

build/windows/launcher/config.xml

@@ -75,4 +75,5 @@
     <launcherErr>The registry refers to a nonexistent Java Development Kit installation or the runtime is corrupted.</launcherErr>
     <instanceAlreadyExistsMsg>An application instance is already running.</instanceAlreadyExistsMsg>
   </messages>
+  <manifest>wrapper-manifest.xml</manifest>
 </launch4jConfig>

build/windows/launcher/config_debug.xml

@@ -75,4 +75,5 @@
     <launcherErr>The registry refers to a nonexistent Java Development Kit installation or the runtime is corrupted.</launcherErr>
     <instanceAlreadyExistsMsg>An application instance is already running.</instanceAlreadyExistsMsg>
   </messages>
+  <manifest>wrapper-manifest.xml</manifest>
 </launch4jConfig>

build/windows/launcher/wrapper-manifest.xml

@@ -0,0 +1,9 @@
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+
+  <asmv3:application>
+    <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
+      <dpiAware>true</dpiAware>
+    </asmv3:windowsSettings>
+  </asmv3:application>
+
+</assembly>