This change should make the UI Icon Size setting dynamic, clearing all cached icons when the size changes (in the settings UI) so if they have a dynamic size the best is selected.

Greenshot/Controls/ContextMenuToolStripProfessionalRenderer.cs

@@ -34,7 +34,10 @@ namespace Greenshot.Controls {
 		private static Image scaledCheckbox;
 
 		protected override void OnRenderItemCheck(ToolStripItemImageRenderEventArgs e) {
-			if (scaledCheckbox == null) {
+			if (scaledCheckbox == null || scaledCheckbox.Size != coreConfiguration.IconSize) {
+				if (scaledCheckbox != null) {
+					scaledCheckbox.Dispose();
+				}
 				scaledCheckbox = ImageHelper.ResizeImage(e.Image, true, coreConfiguration.IconSize.Width, coreConfiguration.IconSize.Height, null);
 			}
 			Rectangle old = e.ImageRectangle;

Greenshot/Forms/MainForm.Designer.cs

@@ -105,7 +105,6 @@ namespace Greenshot {
 			this.contextMenu.Name = "contextMenu";
 			this.contextMenu.Closing += new System.Windows.Forms.ToolStripDropDownClosingEventHandler(this.ContextMenuClosing);
 			this.contextMenu.Opening += new System.ComponentModel.CancelEventHandler(this.ContextMenuOpening);
-			this.contextMenu.ImageScalingSize = coreConfiguration.IconSize;
 			this.contextMenu.Renderer = new Greenshot.Controls.ContextMenuToolStripProfessionalRenderer();
 			// 
 			// contextmenu_capturearea

Greenshot/Forms/MainForm.cs

@@ -388,6 +388,8 @@ namespace Greenshot {
 			}
 			SoundHelper.Initialize();
 
+			MainForm.ResetImageScalingSize();
+
 			// Set the Greenshot icon visibility depending on the configuration. (Added for feature #3521446)
 			// Setting it to true this late prevents Problems with the context menu
 			notifyIcon.Visible = !_conf.HideTrayicon;
@@ -549,6 +551,15 @@ namespace Greenshot {
 			}
 		}
 
+		/// <summary>
+		/// Reset ImageScalingSize
+		/// </summary>
+		/// <returns>Used for fixing scaling issues</returns>
+		public static void ResetImageScalingSize() {
+			MainForm thisForm = MainForm.Instance;
+			thisForm.contextMenu.ImageScalingSize = coreConfiguration.IconSize;
+		}
+
 		/// <summary>
 		/// Registers all hotkeys as configured, displaying a dialog in case of hotkey conflicts with other tools.
 		/// </summary>

Greenshot/Forms/SettingsForm.cs

@@ -414,7 +414,14 @@ namespace Greenshot {
 			coreConfiguration.DWMBackgroundColor = colorButton_window_background.SelectedColor;
 			coreConfiguration.UpdateCheckInterval = (int)numericUpDown_daysbetweencheck.Value;
 
+			Size previousValue = coreConfiguration.IconSize;
 			coreConfiguration.IconSize = new Size((int)numericUpdownIconSize.Value, (int)numericUpdownIconSize.Value);
+
+			// Clear caches when changing the settings
+			if (previousValue != coreConfiguration.IconSize) {
+				PluginUtils.ClearExeIconCache();
+				MainForm.ResetImageScalingSize();
+			}
 			coreConfiguration.FixIconSize();
 			try {
 				if (checkbox_autostartshortcut.Checked) {

Greenshot/Forms/ToolStripMenuSelectList.cs

@@ -35,7 +35,8 @@ namespace Greenshot.Forms {
 		private static CoreConfiguration coreConfiguration = IniConfig.GetIniSection<CoreConfiguration>();
 		private bool multiCheckAllowed = false;
 		private bool updateInProgress = false;
-		private static Image defaultImage = ImageHelper.CreateEmpty(coreConfiguration.IconSize.Width, coreConfiguration.IconSize.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb, Color.Transparent, 96f, 96f);
+		private static Image defaultImage;
+
 		/// <summary>
 		/// Occurs when one of the list's child element's Checked state changes.
 		/// </summary>
@@ -49,10 +50,16 @@ namespace Greenshot.Forms {
 			Identifier = identifier;
 			CheckOnClick = false;
 			multiCheckAllowed = allowMultiCheck;
+			if (defaultImage == null || defaultImage.Size != coreConfiguration.IconSize) {
+				if (defaultImage != null) {
+					defaultImage.Dispose();
+				}
+				defaultImage = ImageHelper.CreateEmpty(coreConfiguration.IconSize.Width, coreConfiguration.IconSize.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb, Color.Transparent, 96f, 96f);
+			}
 			Image = defaultImage;
 		}
 		public ToolStripMenuSelectList() : this(null,false) {}
-		public ToolStripMenuSelectList(Object identifier) : this(identifier,false) {}
+		public ToolStripMenuSelectList(object identifier) : this(identifier,false) {}
 
 		/// <summary>
 		/// gets or sets the currently checked item

GreenshotExternalCommandPlugin/ExternalCommandPlugin.cs

@@ -126,7 +126,7 @@ namespace ExternalCommand {
 			try {
 				string exePath = PluginUtils.GetExePath("cmd.exe");
 				if (exePath != null && File.Exists(exePath)) {
-					itemPlugInRoot.Image = PluginUtils.GetExeIcon(exePath, 0);
+					itemPlugInRoot.Image = PluginUtils.GetCachedExeIcon(exePath, 0);
 				}
 			} catch (Exception ex) {
 				LOG.Warn("Couldn't get the cmd.exe image", ex);

GreenshotExternalCommandPlugin/IconCache.cs

@@ -7,29 +7,21 @@ using GreenshotPlugin.Core;
 
 namespace ExternalCommand {
 	public static class IconCache {
-		private static Dictionary<string, Image> iconCache = new Dictionary<string, Image>();
 		private static ExternalCommandConfiguration config = IniConfig.GetIniSection<ExternalCommandConfiguration>();
 		private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(IconCache));
 
 		public static Image IconForCommand(string commandName) {
+			Image icon = null;
 			if (commandName != null) {
-				if (!iconCache.ContainsKey(commandName)) {
-					Image icon = null;
-					if (config.commandlines.ContainsKey(commandName) && File.Exists(config.commandlines[commandName])) {
-						try {
-							icon = PluginUtils.GetExeIcon(config.commandlines[commandName], 0);
-						} catch (Exception ex) {
-							LOG.Warn("Problem loading icon for " + config.commandlines[commandName], ex);
-						}
+				if (config.commandlines.ContainsKey(commandName) && File.Exists(config.commandlines[commandName])) {
+					try {
+						icon = PluginUtils.GetCachedExeIcon(config.commandlines[commandName], 0);
+					} catch (Exception ex) {
+						LOG.Warn("Problem loading icon for " + config.commandlines[commandName], ex);
 					}
-					// Also add null to the cache if nothing is found
-					iconCache.Add(commandName, icon);
-				}
-				if (iconCache.ContainsKey(commandName)) {
-					return iconCache[commandName];
 				}
 			}
-			return null;
+			return icon;
 		}
 	}
 }

GreenshotOCRPlugin/OCRDestination.cs

@@ -33,16 +33,8 @@ namespace GreenshotOCR {
 		private static OCRConfiguration config = IniConfig.GetIniSection<OCRConfiguration>();
 		private const int MIN_WIDTH = 130;
 		private const int MIN_HEIGHT = 130;
-		private static Image icon = null;
 		private OcrPlugin plugin;
 		
-		static OCRDestination() {
-			string exePath = PluginUtils.GetExePath("MSPVIEW.EXE");
-			if (exePath != null && File.Exists(exePath)) {
-				icon = PluginUtils.GetExeIcon(exePath, 0);
-			}
-		}
-
 		public override string Designation {
 			get {
 				return "OCR";
@@ -57,7 +49,11 @@ namespace GreenshotOCR {
 
 		public override Image DisplayIcon {
 			get {
-				return icon;
+				string exePath = PluginUtils.GetExePath("MSPVIEW.EXE");
+				if (exePath != null && File.Exists(exePath)) {
+					return PluginUtils.GetCachedExeIcon(exePath, 0);
+				}
+				return null;
 			}
 		}
 

GreenshotOfficePlugin/Destinations/ExcelDestination.cs

@@ -36,16 +36,14 @@ namespace GreenshotOfficePlugin {
 	/// </summary>
 	public class ExcelDestination : AbstractDestination {
 		private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(ExcelDestination));
+		private const int ICON_APPLICATION = 0;
+		private const int ICON_WORKBOOK = 1;
 		private static string exePath = null;
-		private static Image applicationIcon = null;
-		private static Image workbookIcon = null;
 		private string workbookName = null;
 
 		static ExcelDestination() {
 			exePath = PluginUtils.GetExePath("EXCEL.EXE");
 			if (exePath != null && File.Exists(exePath)) {
-				applicationIcon = PluginUtils.GetExeIcon(exePath, 0);
-				workbookIcon = PluginUtils.GetExeIcon(exePath, 1);
 				WindowDetails.AddProcessToExcludeFromFreeze("excel");
 			} else {
 				exePath = null;
@@ -96,9 +94,9 @@ namespace GreenshotOfficePlugin {
 		public override Image DisplayIcon {
 			get {
 				if (!string.IsNullOrEmpty(workbookName)) {
-					return workbookIcon;
+					return PluginUtils.GetCachedExeIcon(exePath, ICON_WORKBOOK);
 				}
-				return applicationIcon;
+				return PluginUtils.GetCachedExeIcon(exePath, ICON_APPLICATION);
 			}
 		}
 

GreenshotOfficePlugin/Destinations/OneNoteDestination.cs

@@ -18,32 +18,26 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
+using Greenshot.Interop.Office;
+using Greenshot.Plugin;
+using GreenshotPlugin.Core;
 using System;
 using System.Collections.Generic;
 using System.Drawing;
-using System.Drawing.Imaging;
 using System.IO;
-using System.Windows.Forms;
-
-using GreenshotPlugin.Core;
-using Greenshot.Plugin;
-using Greenshot.Interop.Office;
-using Greenshot.IniFile;
 
 namespace GreenshotOfficePlugin {
 	public class OneNoteDestination : AbstractDestination {
 		private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(WordDestination));
+		private const int ICON_APPLICATION = 0;
 		public const string DESIGNATION = "OneNote";
 		private static string exePath = null;
-		private static Image applicationIcon = null;
-		private static Image notebookIcon = null;
 		private OneNotePage page = null;
 
 		static OneNoteDestination() {
 			exePath = PluginUtils.GetExePath("ONENOTE.EXE");
 			if (exePath != null && File.Exists(exePath)) {
-				applicationIcon = PluginUtils.GetExeIcon(exePath, 0);
-				notebookIcon = PluginUtils.GetExeIcon(exePath, 0);
 				WindowDetails.AddProcessToExcludeFromFreeze("onenote");
 			} else {
 				exePath = null;
@@ -94,10 +88,7 @@ namespace GreenshotOfficePlugin {
 
 		public override Image DisplayIcon {
 			get {
-				if (page != null) {
-					return notebookIcon;
-				}
-				return applicationIcon;
+				return PluginUtils.GetCachedExeIcon(exePath, ICON_APPLICATION);
 			}
 		}
 

GreenshotOfficePlugin/Destinations/OutlookDestination.cs

@@ -18,29 +18,29 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-using System;
+
+using Greenshot.IniFile;
+using Greenshot.Interop.Office;
+using Greenshot.Plugin;
+using GreenshotPlugin.Core;
 using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
 using System.Text.RegularExpressions;
 using System.Windows.Forms;
 
-using Greenshot.Interop.Office;
-using Greenshot.Plugin;
-using GreenshotPlugin.Core;
-using Greenshot.IniFile;
-
 namespace GreenshotOfficePlugin {
 	/// <summary>
 	/// Description of OutlookDestination.
 	/// </summary>
 	public class OutlookDestination : AbstractDestination {
 		private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(OutlookDestination));
+		private const int ICON_APPLICATION = 0;
+		private const int ICON_MEETING = 2;
+
+		private static Image mailIcon = GreenshotPlugin.Core.GreenshotResources.getImage("Email.Image");
 		private static OfficeConfiguration conf = IniConfig.GetIniSection<OfficeConfiguration>();
 		private static string exePath = null;
-		private static Image applicationIcon = null;
-		private static Image mailIcon = GreenshotPlugin.Core.GreenshotResources.getImage("Email.Image");
-		private static Image meetingIcon = null;
 		private static bool isActiveFlag = false;
 		private static string mapiClient = "Microsoft Outlook";
 		public const string DESIGNATION = "Outlook";
@@ -53,11 +53,7 @@ namespace GreenshotOfficePlugin {
 			}
 			exePath = PluginUtils.GetExePath("OUTLOOK.EXE");
 			if (exePath != null && File.Exists(exePath)) {
-				applicationIcon = PluginUtils.GetExeIcon(exePath, 0);
 				WindowDetails.AddProcessToExcludeFromFreeze("outlook");
-				if (conf.OutlookAllowExportInMeetings) {
-					meetingIcon = PluginUtils.GetExeIcon(exePath, 2);
-				}
 			} else {
 				exePath = null;
 			}
@@ -119,15 +115,12 @@ namespace GreenshotOfficePlugin {
 				if (outlookInspectorCaption != null) {
 					if (OlObjectClass.olAppointment.Equals(outlookInspectorType)) {
 						// Make sure we loaded the icon, maybe the configuration has been changed!
-						if (meetingIcon == null) {
-							meetingIcon = PluginUtils.GetExeIcon(exePath, 2);
-						}
-						return meetingIcon;
+						return PluginUtils.GetCachedExeIcon(exePath, ICON_MEETING);
 					} else {
 						return mailIcon;
 					}
 				} else {
-					return applicationIcon;
+					return PluginUtils.GetCachedExeIcon(exePath, ICON_APPLICATION);
 				}
 			}
 		}

GreenshotOfficePlugin/Destinations/PowerpointDestination.cs

@@ -36,16 +36,15 @@ namespace GreenshotOfficePlugin {
 	/// </summary>
 	public class PowerpointDestination : AbstractDestination {
 		private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(PowerpointDestination));
+		private const int ICON_APPLICATION = 0;
+		private const int ICON_PRESENTATION = 1;
+
 		private static string exePath = null;
-		private static Image applicationIcon = null;
-		private static Image presentationIcon = null;
 		private string presentationName = null;
 		
 		static PowerpointDestination() {
 			exePath = PluginUtils.GetExePath("POWERPNT.EXE");
 			if (exePath != null && File.Exists(exePath)) {
-				applicationIcon = PluginUtils.GetExeIcon(exePath, 0);
-				presentationIcon = PluginUtils.GetExeIcon(exePath, 1);
 				WindowDetails.AddProcessToExcludeFromFreeze("powerpnt");
 			} else {
 				exePath = null;
@@ -96,10 +95,10 @@ namespace GreenshotOfficePlugin {
 		public override Image DisplayIcon {
 			get {
 				if (!string.IsNullOrEmpty(presentationName)) {
-					return presentationIcon;
+					return PluginUtils.GetCachedExeIcon(exePath, ICON_PRESENTATION);
 				}
 
-				return applicationIcon;
+				return PluginUtils.GetCachedExeIcon(exePath, ICON_APPLICATION);
 			}
 		}
 

GreenshotOfficePlugin/Destinations/WordDestination.cs

@@ -18,17 +18,14 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
+using Greenshot.Interop.Office;
+using Greenshot.Plugin;
+using GreenshotPlugin.Core;
 using System;
 using System.Collections.Generic;
 using System.Drawing;
-using System.Drawing.Imaging;
 using System.IO;
-using System.Windows.Forms;
-
-using GreenshotPlugin.Core;
-using Greenshot.Plugin;
-using Greenshot.Interop.Office;
-using Greenshot.IniFile;
 using System.Text.RegularExpressions;
 
 namespace GreenshotOfficePlugin {
@@ -37,17 +34,14 @@ namespace GreenshotOfficePlugin {
 	/// </summary>
 	public class WordDestination : AbstractDestination {
 		private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(WordDestination));
+		private const int ICON_APPLICATION = 0;
+		private const int ICON_DOCUMENT = 1;
 		private static string exePath = null;
-		private static Image applicationIcon = null;
-		private static Image documentIcon = null;
 		private string documentCaption = null;
 
 		static WordDestination() {
 			exePath = PluginUtils.GetExePath("WINWORD.EXE");
-			if (exePath != null && File.Exists(exePath)) {
-				applicationIcon = PluginUtils.GetExeIcon(exePath, 0);
-				documentIcon = PluginUtils.GetExeIcon(exePath, 1);
-			} else {
+			if (exePath != null && !File.Exists(exePath)) {
 				exePath = null;
 			}
 		}
@@ -97,9 +91,9 @@ namespace GreenshotOfficePlugin {
 		public override Image DisplayIcon {
 			get {
 				if (!string.IsNullOrEmpty(documentCaption)) {
-					return documentIcon;
+					return PluginUtils.GetCachedExeIcon(exePath, ICON_DOCUMENT);
 				}
-				return applicationIcon;
+				return PluginUtils.GetCachedExeIcon(exePath, ICON_APPLICATION);
 			}
 		}
 

GreenshotPlugin/Core/PluginUtils.cs

@@ -25,6 +25,7 @@ using GreenshotPlugin.UnmanagedHelpers;
 using log4net;
 using Microsoft.Win32;
 using System;
+using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
 using System.Windows.Forms;
@@ -37,6 +38,7 @@ namespace GreenshotPlugin.Core {
 		private static readonly ILog LOG = LogManager.GetLogger(typeof(PluginUtils));
 		private static CoreConfiguration conf = IniConfig.GetIniSection<CoreConfiguration>();
 		private const string PATH_KEY = @"SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\";
+		private static IDictionary<string, Image> exeIconCache = new Dictionary<string, Image>();
 
 		/// <summary>
 		/// Simple global property to get the Greenshot host
@@ -46,6 +48,21 @@ namespace GreenshotPlugin.Core {
 			set;
 		}
 
+		public static void ClearExeIconCache() {
+			List<Image> cachedImages = new List<Image>();
+			lock (exeIconCache) {
+				foreach (string key in exeIconCache.Keys) {
+					cachedImages.Add(exeIconCache[key]);
+				}
+				exeIconCache.Clear();
+			}
+			foreach (Image cachedImage in cachedImages) {
+				if (cachedImage != null) {
+					cachedImage.Dispose();
+				}
+			}
+		}
+
 		/// <summary>
 		/// Get the path of an executable
 		/// </summary>
@@ -71,13 +88,35 @@ namespace GreenshotPlugin.Core {
 			return null;
 		}
 		
+		/// <summary>
+		/// Get icon for executable, from the cache
+		/// </summary>
+		/// <param name="path">path to the exe or dll</param>
+		/// <param name="index">index of the icon</param>
+		/// <returns>Bitmap with the icon or null if something happended</returns>
+		public static Image GetCachedExeIcon(string path, int index) {
+			string cacheKey = string.Format("{0}:{1}", path, index);
+			Image returnValue;
+			if (!exeIconCache.TryGetValue(cacheKey, out returnValue)) {
+				lock (exeIconCache) {
+					if (!exeIconCache.TryGetValue(cacheKey, out returnValue)) {
+						returnValue = GetExeIcon(path, index);
+						if (returnValue != null) {
+							exeIconCache.Add(cacheKey, returnValue);
+						}
+					}
+				}
+			}
+			return returnValue;
+		}
+
 		/// <summary>
 		/// Get icon for executable
 		/// </summary>
 		/// <param name="path">path to the exe or dll</param>
 		/// <param name="index">index of the icon</param>
 		/// <returns>Bitmap with the icon or null if something happended</returns>
-		public static Bitmap GetExeIcon(string path, int index) {
+		private static Bitmap GetExeIcon(string path, int index) {
 			if (!File.Exists(path)) {
 				return null;
 			}

GreenshotPlugin/Core/WindowsHelper.cs

@@ -170,7 +170,6 @@ namespace GreenshotPlugin.Core  {
 		private static Dictionary<string, List<string>> classnameTree = new Dictionary<string, List<string>>();
 		private static CoreConfiguration conf = IniConfig.GetIniSection<CoreConfiguration>();
 		private static List<IntPtr> ignoreHandles = new List<IntPtr>();
-		private static Dictionary<string, Image> iconCache = new Dictionary<string, Image>();
 		private static List<string> excludeProcessesFromFreeze = new List<string>();
 		private static IAppVisibility appVisibility = null;
 		
@@ -204,7 +203,6 @@ namespace GreenshotPlugin.Core  {
 			}
 		}
 		
-		
 		public bool isGutter {
 			get {
 				return METRO_GUTTER_CLASS.Equals(ClassName);
@@ -307,17 +305,7 @@ namespace GreenshotPlugin.Core  {
 					return null;
 				}
 				try {
-					string filename = ProcessPath;
-					if (!iconCache.ContainsKey(filename)) {
-						Image icon = null;
-						using (Icon appIcon = Shell32.ExtractAssociatedIcon(filename)) {
-							if (appIcon != null) {
-								icon = appIcon.ToBitmap();
-							}
-						}
-						iconCache.Add(filename, icon);
-					}
-					return iconCache[filename];
+					return PluginUtils.GetCachedExeIcon(ProcessPath, 0);
 				} catch (Exception ex) {
 					LOG.WarnFormat("Couldn't get icon for window {0} due to: {1}", Text, ex.Message);
 					LOG.Warn(ex);