Fixed some dpi scaling bugs that occurred when changing "Control Panel\Appearance and Personalization\Display" to 125% text size or 150% text size.

GUI/MainForm.Designer.cs

@@ -436,8 +436,7 @@ namespace OpenHardwareMonitor.GUI {
       this.treeView.NodeControls.Add(this.nodeTextBoxText);
       this.treeView.NodeControls.Add(this.nodeTextBoxValue);
       this.treeView.NodeControls.Add(this.nodeTextBoxMin);
-      this.treeView.NodeControls.Add(this.nodeTextBoxMax);
-      this.treeView.RowHeight = 18;
+      this.treeView.NodeControls.Add(this.nodeTextBoxMax);      
       this.treeView.SelectedNode = null;
       this.treeView.Size = new System.Drawing.Size(386, 354);
       this.treeView.TabIndex = 0;

GUI/MainForm.cs

@@ -91,6 +91,7 @@ namespace OpenHardwareMonitor.GUI {
       this.Font = SystemFonts.MessageBoxFont;
       treeView.Font = SystemFonts.MessageBoxFont;
       plotPanel.Font = SystemFonts.MessageBoxFont;
+      treeView.RowHeight = treeView.Font.Height;      
       
       nodeCheckBox.IsVisibleValueNeeded += nodeCheckBox_IsVisibleValueNeeded;
       nodeCheckBox.CheckStateChanged += UpdatePlotSelection;

GUI/SensorGadget.cs

@@ -54,6 +54,7 @@ namespace OpenHardwareMonitor.GUI {
     private const int leftBorder = 6;
     private const int rightBorder = 7;
 
+    private readonly float scale;
     private float fontSize;
     private int iconSize;
     private int hardwareLineHeight;
@@ -108,6 +109,11 @@ namespace OpenHardwareMonitor.GUI {
         settings.SetValue("sensorGadget.Location.Y", Location.Y);
       };
 
+      // get the custom to default dpi ratio
+      using (Bitmap b = new Bitmap(1, 1)) {
+        scale = b.HorizontalResolution / 96.0f;
+      }
+
       SetFontSize(settings.GetValue("sensorGadget.FontSize", 7.5f));
       Resize(settings.GetValue("sensorGadget.Width", Size.Width));
       
@@ -329,15 +335,18 @@ namespace OpenHardwareMonitor.GUI {
       fontSize = size;
       largeFont = CreateFont(fontSize, FontStyle.Bold);
       smallFont = CreateFont(fontSize, FontStyle.Regular);
-      iconSize = (int)Math.Round(1.5 * fontSize);
-      hardwareLineHeight = (int)Math.Round(1.66 * fontSize);
-      sensorLineHeight = (int)Math.Round(1.33 * fontSize);      
-      leftMargin = leftBorder + (int)Math.Round(0.3 * fontSize);
-      rightMargin = rightBorder + (int)Math.Round(0.3 * fontSize);
+      
+      double scaledFontSize = fontSize * scale;
+      iconSize = (int)Math.Round(1.5 * scaledFontSize);
+      hardwareLineHeight = (int)Math.Round(1.66 * scaledFontSize);
+      sensorLineHeight = (int)Math.Round(1.33 * scaledFontSize);
+      leftMargin = leftBorder + (int)Math.Round(0.3 * scaledFontSize);
+      rightMargin = rightBorder + (int)Math.Round(0.3 * scaledFontSize);
       topMargin = topBorder;
-      bottomMargin = bottomBorder + (int)Math.Round(0.3 * fontSize);
-      progressWidth = (int)Math.Round(5.3 * fontSize);
-      Resize((int)Math.Round(17.3 * fontSize));
+      bottomMargin = bottomBorder + (int)Math.Round(0.3 * scaledFontSize);
+      progressWidth = (int)Math.Round(5.3 * scaledFontSize);
+
+      Resize((int)Math.Round(17.3 * scaledFontSize));
     }
 
     private void Resize() {

GUI/SensorNotifyIcon.cs

@@ -112,7 +112,22 @@ namespace OpenHardwareMonitor.GUI {
         sensorSystemTray.SendHideShowCommand();
       };
 
-      this.bitmap = new Bitmap(16, 16, PixelFormat.Format32bppArgb);
+      // get the default dpi to create an icon with the correct size
+      float dpiX, dpiY;
+      using (Bitmap b = new Bitmap(1, 1, PixelFormat.Format32bppArgb)) {
+        dpiX = b.HorizontalResolution;
+        dpiY = b.VerticalResolution;
+      }
+
+      // adjust the size of the icon to current dpi (default is 16x16 at 96 dpi) 
+      int width = (int)Math.Round(16 * dpiX / 96);
+      int height = (int)Math.Round(16 * dpiY / 96);
+
+      // make sure it does never get smaller than 16x16
+      width = width < 16 ? 16: width;
+      height = height < 16 ? 16: height;
+
+      this.bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);      
       this.graphics = Graphics.FromImage(this.bitmap);
 
       if (Environment.OSVersion.Version.Major > 5) {
@@ -211,7 +226,8 @@ namespace OpenHardwareMonitor.GUI {
         bytes[i + 3] = (byte)(0.3 * red + 0.59 * green + 0.11 * blue);
       }
 
-      return IconFactory.Create(bytes, 16, 16, PixelFormat.Format32bppArgb);
+      return IconFactory.Create(bytes, bitmap.Width, bitmap.Height, 
+        PixelFormat.Format32bppArgb);
     }
 
     private Icon CreatePercentageIcon() {      
@@ -220,10 +236,10 @@ namespace OpenHardwareMonitor.GUI {
       } catch (ArgumentException) {
         graphics.Clear(Color.Black);
       }
-      graphics.FillRectangle(darkBrush, 0.5f, -0.5f, 14, 16);
+      graphics.FillRectangle(darkBrush, 0.5f, -0.5f, bitmap.Width - 2, bitmap.Height);
       float y = 0.16f * (100 - sensor.Value.Value);
-      graphics.FillRectangle(brush, 0.5f, -0.5f + y, 14, 16 - y);
-      graphics.DrawRectangle(pen, 1, 0, 13, 15);
+      graphics.FillRectangle(brush, 0.5f, -0.5f + y, bitmap.Width - 2, bitmap.Height - y);
+      graphics.DrawRectangle(pen, 1, 0, bitmap.Width - 3, bitmap.Height - 1);
 
       BitmapData data = bitmap.LockBits(
         new Rectangle(0, 0, bitmap.Width, bitmap.Height),
@@ -232,7 +248,8 @@ namespace OpenHardwareMonitor.GUI {
       Marshal.Copy(data.Scan0, bytes, 0, bytes.Length);
       bitmap.UnlockBits(data);
 
-      return IconFactory.Create(bytes, 16, 16, PixelFormat.Format32bppArgb);
+      return IconFactory.Create(bytes, bitmap.Width, bitmap.Height, 
+        PixelFormat.Format32bppArgb);
     }
 
     public void Update() {

Properties/AssemblyVersion.cs

@@ -37,5 +37,5 @@
 
 using System.Reflection;
 
-[assembly: AssemblyVersion("0.2.1.10")]
-[assembly: AssemblyInformationalVersion("0.2.1.10 Alpha")]
+[assembly: AssemblyVersion("0.2.1.11")]
+[assembly: AssemblyInformationalVersion("0.2.1.11 Alpha")]