JAL-3609 system properties to force a scale, or automatically choose based on OS...

[jalview.git] / getdown / src / getdown / core / src / main / java / jalview / bin / HiDPISetting.java

diff --git a/getdown/src/getdown/core/src/main/java/jalview/bin/HiDPISetting.java b/getdown/src/getdown/core/src/main/java/jalview/bin/HiDPISetting.java
index 5e20d76..770fb27 100644 (file)
--- a/getdown/src/getdown/core/src/main/java/jalview/bin/HiDPISetting.java
+++ b/getdown/src/getdown/core/src/main/java/jalview/bin/HiDPISetting.java
@@ -4,45 +4,121 @@ import java.awt.Toolkit;
 
 public class HiDPISetting
 {
-  public static final int dpi;
+  private static final int hidpiThreshold = 130;
 
-  public static final int scale;
+  private static final int tallScreenThreshold = 1300;
 
-  private static final int hidpi = 110;
+  private static final String scalePropertyName = "sun.java2d.uiScale";
 
-  private static final String scaleProperty = "sun.java2d.uiScale";
+  private static final boolean isAMac;
 
-  private static final boolean isAMac = System.getProperty("os.name")
-          .indexOf("Mac") > -1;
+  private static final boolean isLinux;
 
-  private static final boolean isLinux = System.getProperty("os.name")
-          .toLowerCase().indexOf("linux") > -1;
+  private static final boolean isWindows;
 
-  private static final boolean isWindows = System.getProperty("os.name")
-          .toLowerCase().indexOf("windows") > -1;
+  public static final String forceHiDPISettingPropertyName = "forceHiDPISetting";
+
+  public static final String forceHiDPISettingScalePropertyName = "forceHiDPISettingScale";
+
+  private static final boolean forceHiDPISetting;
+
+  private static final int forceHiDPISettingScale;
+
+  public static int dpi = 0;
+
+  public static int height = 0;
+
+  public static int scale = 0;
+
+  private static boolean doneInit = false;
+
+  private static boolean allowScalePropertyArg = false;
 
   static
   {
-    dpi = Toolkit.getDefaultToolkit().getScreenResolution();
-    scale = dpi / hidpi + 1;
-    if (scale > 1 && isLinux)
+    isAMac = System.getProperty("os.name").indexOf("Mac") > -1;
+    isLinux = System.getProperty("os.name").toLowerCase()
+            .indexOf("linux") > -1;
+    isWindows = System.getProperty("os.name").toLowerCase()
+            .indexOf("windows") > -1;
+
+    String forceHiDPISettingProperty = System
+            .getProperty(forceHiDPISettingPropertyName);
+    forceHiDPISetting = forceHiDPISettingProperty != null
+            && forceHiDPISettingProperty.equalsIgnoreCase("true");
+
+    int tryForceHiDPISettingScale = 0;
+    String forceHiDPISettingScaleProperty = System
+            .getProperty(forceHiDPISettingScalePropertyName);
+    if (forceHiDPISettingScaleProperty != null)
     {
-      System.out.println("DPI detected as " + dpi
-              + ". Scaling factor set to " + scale + ".");
+      try
+      {
+        tryForceHiDPISettingScale = Integer
+                .parseInt(forceHiDPISettingScaleProperty);
+      } catch (NumberFormatException e)
+      {
+        System.err.println(forceHiDPISettingScalePropertyName
+                + " property give (" + forceHiDPISettingScaleProperty
+                + ") but not parseable as integer");
+      }
     }
+    forceHiDPISettingScale = tryForceHiDPISettingScale;
   }
 
-  public static String getScalePropertyArg()
+  private void init()
   {
-    // HiDPI setting. Just looking at Linux to start with. Test with Windows.
-    if (!isLinux)
+    if (doneInit)
     {
-      return null;
+      return;
     }
-    if (scale > 1)
+
+    // try and get screen resolution
+    try
     {
-      return "-D" + scaleProperty + "=" + scale;
+      dpi = Toolkit.getDefaultToolkit().getScreenResolution();
+    } catch (Throwable t)
+    {
+      System.err.println("Cannot get screen resolution");
     }
-    return null;
+
+    // try and get screen size height
+    try
+    {
+      height = Toolkit.getDefaultToolkit().getScreenSize().height;
+    } catch (Throwable t)
+    {
+      System.err.println("Cannot get screen size height");
+    }
+
+    if (forceHiDPISetting && forceHiDPISettingScale > 0)
+    {
+      scale = forceHiDPISettingScale;
+    }
+    else
+    {
+      // attempt at a formula for scaling based on screen dpi and height. scale
+      // will be an integer >=1
+      scale = Math.min(dpi / hidpiThreshold, height / tallScreenThreshold)
+              + 1;
+    }
+
+    allowScalePropertyArg = (scale > 1 && isLinux) || forceHiDPISetting;
+
+    if (allowScalePropertyArg)
+    {
+      System.out.println("boolean forceHiDPISetting=" + forceHiDPISetting);
+      System.out.println("DPI detected as " + dpi
+              + ". Scaling factor set to " + scale + ".");
+    }
+
+    doneInit = true;
+  }
+
+  public static synchronized String getScalePropertyArg()
+  {
+    // HiDPI setting. Just looking at Linux to start with. Test with Windows.
+    return allowScalePropertyArg ? "-D" + scalePropertyName + "=" + scale
+            : null;
   }
 }