Added: Guess rows and cols based on the texture

Author: kleber-swf

Editor/BitmapFontCreator.cs

@@ -83,7 +83,6 @@ private static CharacterInfo[] CreateCharacters(ExecutionData data, Dictionary<c
 			int xMin, xMax, advance;
 			int largestAdvance = 0;
 
-			// horizontal
 			for (var row = 0; row < data.Rows; row++)
 			{
 				for (var col = 0; col < data.Cols; col++)
@@ -174,5 +173,67 @@ private static void CreateOrReplaceAsset<T>(T asset, string path) where T : Obje
 				AssetDatabase.SaveAssets();
 			}
 		}
+
+		public static Vector2Int GuessRowsAndCols(Texture2D tex)
+		{
+			var rows = 0;
+			var cols = 0;
+
+			uint state = 0;   // 0 = looking for not transparent, 1 = looking for transparent
+			bool foundNonTransparentPixel;
+
+			for (var x = 0; x < tex.width; x++)
+			{
+				foundNonTransparentPixel = false;
+				for (var y = 0; y < tex.height; y++)
+				{
+					if (tex.GetPixel(x, y).a == 0) continue;
+					foundNonTransparentPixel = true;
+					break;
+				}
+
+				if (state == 0)
+				{
+					if (foundNonTransparentPixel)
+					{
+						state = 1;
+						cols++;
+					}
+				}
+				else
+				{
+					if (!foundNonTransparentPixel)
+						state = 0;
+				}
+			}
+
+			state = 0;
+			for (var y = 0; y < tex.height; y++)
+			{
+				foundNonTransparentPixel = false;
+				for (var x = 0; x < tex.width; x++)
+				{
+					if (tex.GetPixel(x, y).a == 0) continue;
+					foundNonTransparentPixel = true;
+					break;
+				}
+
+				if (state == 0)
+				{
+					if (foundNonTransparentPixel)
+					{
+						state = 1;
+						rows++;
+					}
+				}
+				else
+				{
+					if (!foundNonTransparentPixel)
+						state = 0;
+				}
+			}
+
+			return new(rows, cols);
+		}
 	}
 }

Editor/UI/BitmapFontCreatorEditor.cs

@@ -17,10 +17,12 @@ public class BitmapFontCreatorEditor : EditorWindow
 		private Vector2 _mainScrollPos = Vector2.zero;
 		private int _selectedCharacterSetIndex = 0;
 
+		private static Vector2Int _guessCache;
+
 		[MenuItem(MenuItemPath)]
 		public static void ShowWindow()
 		{
-			var size = new Vector2(300, 550);
+			var size = new Vector2(300, 580);
 			var window = GetWindowWithRect<BitmapFontCreatorEditor>(
 				new Rect((Screen.width - size.x) * 0.5f, (Screen.height - size.y) * 0.5f, size.x, size.y),
 				false,
@@ -52,11 +54,18 @@ private void OnGUI()
 			_mainScrollPos = GUILayout.BeginScrollView(_mainScrollPos, false, false, GUIStyle.none, GUI.skin.verticalScrollbar, GUILayout.ExpandHeight(true));
 			GUILayout.BeginVertical();
 
-			_data.Texture = EditorGUILayout.ObjectField(UI.Texture, _data.Texture, typeof(Texture2D), false) as Texture2D;
-			_data.Orientation = (Orientation)EditorGUILayout.EnumPopup(UI.Orientation, _data.Orientation);
+			DrawTextureField();
 
 			_data.Cols = EditorGUILayout.IntField(UI.Cols, _data.Cols);
 			_data.Rows = EditorGUILayout.IntField(UI.Rows, _data.Rows);
+
+			GUILayout.BeginHorizontal();
+			GUILayout.Space(EditorGUIUtility.labelWidth);
+			if (GUILayout.Button(UI.GuessButton)) GuessRowsAndCols();
+			GUILayout.EndHorizontal();
+
+			EditorGUILayout.Space();
+			_data.Orientation = (Orientation)EditorGUILayout.EnumPopup(UI.Orientation, _data.Orientation);
 			_data.AlphaThreshold = EditorGUILayout.Slider(UI.AlphaThreshold, _data.AlphaThreshold, 0f, 1f);
 			_data.Monospaced = EditorGUILayout.Toggle(UI.Monospaced, _data.Monospaced);
 
@@ -82,6 +91,14 @@ private void OnGUI()
 			DrawBottomMenu();
 		}
 
+		private void DrawTextureField()
+		{
+			EditorGUI.BeginChangeCheck();
+			_data.Texture = EditorGUILayout.ObjectField(UI.Texture, _data.Texture, typeof(Texture2D), false) as Texture2D;
+			if (EditorGUI.EndChangeCheck())
+				_guessCache = Vector2Int.zero;
+		}
+
 		private void DrawCharacterSetDropDown()
 		{
 			_selectedCharacterSetIndex = EditorGUILayout.Popup(UI.CharacterSet, _selectedCharacterSetIndex, CharacterSets.Names);
@@ -140,5 +157,21 @@ private void RollbackSettings()
 			var profile = (BitmapFontCreatorData)_settings.Profiles.Selected ?? ExecutionData.Default;
 			profile.CopyTo(_data);
 		}
+
+		private void GuessRowsAndCols()
+		{
+			if (_data.Texture == null)
+			{
+				Debug.LogWarning("Texture cannot be null");
+				return;
+			}
+
+			_guessCache = _guessCache.x == 0 || _guessCache.y == 0
+				? BitmapFontCreator.GuessRowsAndCols(_data.Texture)
+				: _guessCache;
+
+			_data.Cols = _guessCache.y;
+			_data.Rows = _guessCache.x;
+		}
 	}
 }

Editor/UI/UIModel.cs

@@ -27,6 +27,7 @@ internal static class UI
 		public static readonly GUIContent Orientation = new("Orientation", "Order to look up for characters in the texture");
 		public static readonly GUIContent Cols = new("Cols", "Number of columns in the texture");
 		public static readonly GUIContent Rows = new("Rows", "Number of rows in the texture");
+		public static readonly GUIContent GuessButton = new("Guess", "Guess Rows and Cols");
 		public static readonly GUIContent AlphaThreshold = new("Alpha Threshold", "Alpha threshold to identify characters bounds");
 		public static readonly GUIContent Monospaced = new("Monospaced", "Whether the result font should be monospaced");
 		public static readonly GUIContent CharacterSet = new("Character Set", "Predefined character set to use");