Add 'Points' as a unit of measure in Screen Ruler

This adds 'Points' (pt) as a new measurement unit option in Screen Ruler.
Points are commonly used in typography and design (1 point = 1/72 inch).

- Add Point enum value (16) to Measurement::Unit
- Add conversion logic for Points based on pixel-to-mm ratio
- Add 'pt' abbreviation string resource
- Add Points option to Settings UI ComboBox

Fixes #39464

Author: ThanhNguyxn

src/modules/MeasureTool/MeasureToolCore/Measurement.cpp

@@ -34,6 +34,8 @@ namespace
                 return pixels * px2mmRatio / 10.0f;
             case Measurement::Unit::Millimetre:
                 return pixels * px2mmRatio;
+            case Measurement::Unit::Point:
+                return pixels * px2mmRatio / 10.0f / 2.54f * 72.0f;
             default:
                 return pixels;
             }
@@ -50,14 +52,16 @@ namespace
                 return pixels / 96.0f * 2.54f;
             case Measurement::Unit::Millimetre:
                 return pixels / 96.0f / 10.0f * 2.54f;
+            case Measurement::Unit::Point:
+                return pixels / 96.0f * 72.0f;
             default:
                 return pixels;
             }
         }
     }
 }
 
-winrt::hstring Measurement::abbreviations[4]{};
+winrt::hstring Measurement::abbreviations[5]{};
 
 inline float Measurement::Width(const Unit units) const
 {
@@ -81,6 +85,8 @@ Measurement::Unit Measurement::GetUnitFromIndex(int index)
         return Measurement::Unit::Centimetre;
     case 3:
         return Measurement::Unit::Millimetre;
+    case 4:
+        return Measurement::Unit::Point;
     default:
         return Measurement::Unit::Pixel;
     }
@@ -94,6 +100,7 @@ void Measurement::InitResources()
     abbreviations[1] = mm.GetValue(L"Resources/MeasurementUnitAbbrInch").ValueAsString();
     abbreviations[2] = mm.GetValue(L"Resources/MeasurementUnitAbbrCentimetre").ValueAsString();
     abbreviations[3] = mm.GetValue(L"Resources/MeasurementUnitAbbrMillimetre").ValueAsString();
+    abbreviations[4] = mm.GetValue(L"Resources/MeasurementUnitAbbrPoint").ValueAsString();
 }
 
 const wchar_t* Measurement::GetUnitAbbreviation(Measurement::Unit units)
@@ -108,6 +115,8 @@ const wchar_t* Measurement::GetUnitAbbreviation(Measurement::Unit units)
         return abbreviations[2].c_str();
     case Unit::Millimetre:
         return abbreviations[3].c_str();
+    case Unit::Point:
+        return abbreviations[4].c_str();
     default:
         return L"??";
     }
@@ -174,6 +183,13 @@ Measurement::PrintResult Measurement::Print(wchar_t* buf,
                                         L" %s",
                                         Measurement::GetUnitAbbreviation(unit));
 
+            break;
+        case Measurement::Unit::Point:
+            result.strLen += swprintf_s(buf + result.strLen,
+                                        bufSize - result.strLen,
+                                        L" %s",
+                                        Measurement::GetUnitAbbreviation(unit));
+
             break;
         }
         if (paren)
@@ -188,6 +204,7 @@ Measurement::PrintResult Measurement::Print(wchar_t* buf,
         Measurement::Unit::Millimetre,
         Measurement::Unit::Inch,
         Measurement::Unit::Centimetre,
+        Measurement::Unit::Point,
     };
     // We only use two units at most, it would be to long otherwise.
     for each (Measurement::Unit unit in allUnits)

src/modules/MeasureTool/MeasureToolCore/Measurement.h

@@ -13,12 +13,13 @@ struct Measurement
         Inch = 2,
         Centimetre = 4,
         Millimetre = 8,
+        Point = 16,
     };
 
     D2D1_RECT_F rect = {}; // corners are inclusive
 
     float px2mmRatio = 0;
-    static winrt::hstring abbreviations[4]; // Abbreviations of units.
+    static winrt::hstring abbreviations[5]; // Abbreviations of units.
 
     Measurement(const Measurement&) = default;
     Measurement& operator=(const Measurement&) = default;

src/modules/MeasureTool/MeasureToolUI/Strings/en-us/Resources.resw

@@ -78,4 +78,7 @@
     <data name="MeasurementUnitAbbrMillimetre" xml:space="preserve">
         <value>mm</value>
     </data>
+    <data name="MeasurementUnitAbbrPoint" xml:space="preserve">
+        <value>pt</value>
+    </data>
 </root>

src/settings-ui/Settings.UI/SettingsXAML/Views/MeasureToolPage.xaml

@@ -86,6 +86,7 @@
                             <ComboBoxItem x:Uid="MeasureTool_UnitsOfMeasure_Inches" />
                             <ComboBoxItem x:Uid="MeasureTool_UnitsOfMeasure_Centimeters" />
                             <ComboBoxItem x:Uid="MeasureTool_UnitsOfMeasure_Millimeters" />
+                            <ComboBoxItem x:Uid="MeasureTool_UnitsOfMeasure_Points" />
                         </ComboBox>
                     </tkcontrols:SettingsCard>
 

src/settings-ui/Settings.UI/Strings/en-us/Resources.resw

@@ -203,6 +203,9 @@
   <data name="MeasureTool_UnitsOfMeasure_Millimeters.Content" xml:space="preserve">
     <value>Millimeters</value>
   </data>
+  <data name="MeasureTool_UnitsOfMeasure_Points.Content" xml:space="preserve">
+    <value>Points</value>
+  </data>
   <data name="MeasureTool_PixelTolerance.Header" xml:space="preserve">
     <value>Pixel tolerance for edge detection</value>
   </data>