Add variant selector to remove notches for equality ligations (#1425).

changes/16.3.0.md

@@ -1 +1,2 @@
+ * Add variant selector to remove notches for equality ligations (#1425).
  * Fix `cv40`'s application to CYRILLIC SMALL LETTER ER (`U+0440`) (#1426).

font-src/glyphs/symbol/ligation.ptl

@@ -255,100 +255,43 @@ glyph-block Symbol-Ligation : begin
 		glyph-block-import Symbol-Math-Relation-Common : EqualHalfSpace
 		glyph-block-import Symbol-Math-Relation-Equal : EqualShape EqualHole IdentShape IdentHole
 		define joiningOverlap (-Width / 6)
-		create-glyph 'equal.fc' : glyph-proc
-			Joining.set currentGlyph Joining.Classes.Right
-			include : difference
-				EqualShape SB (Width - joiningOverlap)
-				EqualHole Width
 
-		create-glyph 'equal.cf' : glyph-proc
+		define SymbolConfig : object
-			Joining.set currentGlyph Joining.Classes.Left
+			"equal"  { EqualShape EqualHole }
-			include : difference
+			"ident"  { IdentShape IdentHole }
-				EqualShape joiningOverlap RightSB
-				EqualHole 0
 
-		create-glyph 'equal.jf' : glyph-proc
+		define JoinConfig : object
-			Joining.set currentGlyph Joining.Classes.Left
+		    #          Shape Left                          Shape Right               Hole positions
-			include : difference
+			"fc"     { SB                                  (Width - joiningOverlap)  { Width }       }
-				EqualShape (RightSB - Width + joiningOverlap) RightSB
+			"cf"     { joiningOverlap                      RightSB                   { 0 }           }
-				EqualHole 0
+			"jf"     { (RightSB - Width + joiningOverlap)  RightSB                   { 0 }           }
+			"cc"     { joiningOverlap                      (Width - joiningOverlap)  { 0 Width }     }
+			"fc+cc"  { (SB - Width)                        (Width - joiningOverlap)  { 0 Width }     }
+			"fc+cf"  { (SB - Width)                        RightSB                   { 0 }           }
+			"cc+cf"  { (joiningOverlap - Width)            RightSB                   { (-Width) 0 }  }
 
-		create-glyph 'equal.cc' : glyph-proc
+		define NotchConfig : object
-			Joining.set currentGlyph Joining.Classes.Mid
+			withNotch    { true  }
-			include : difference
+			withoutNotch { false }
-				EqualShape joiningOverlap (Width - joiningOverlap)
-				EqualHole 0
-				EqualHole Width
 
-		create-glyph 'equal.fc+cc' : glyph-proc
+		foreach { prefix { Shape Hole } } [Object.entries SymbolConfig] : do
-			Joining.set currentGlyph Joining.Classes.Mid
+			foreach { infix { shapeLeft shapeRight xHoles } } [Object.entries JoinConfig] : do
-			include : difference
+				local joinCls 0
-				EqualShape (SB - Width) (Width - joiningOverlap)
+				if (shapeLeft  < 0)     : set joinCls : joinCls + Joining.Classes.Left
-				EqualHole 0
+				if (shapeRight > Width) : set joinCls : joinCls + Joining.Classes.Right
-				EqualHole Width
 
-		create-glyph 'equal.fc+cf' : glyph-proc
+				foreach { suffix { doNotch } } [Object.entries NotchConfig] : do
-			Joining.set currentGlyph Joining.Classes.Left
+					create-glyph "\(prefix).\(infix).\(suffix)" : glyph-proc
+						Joining.set currentGlyph joinCls
 						include : difference
-				EqualShape (SB - Width) RightSB
+							Shape shapeLeft shapeRight
-				EqualHole 0
+							if doNotch
+							: then : union.apply null [xHoles.map Hole]
+							: else : glyph-proc
 
-		create-glyph 'equal.cc+cf' : glyph-proc
+				select-variant "\(prefix).\(infix)" (follow -- "lig-\(prefix)")
-			Joining.set currentGlyph Joining.Classes.Left
-			include : difference
-				EqualShape (joiningOverlap - Width) RightSB
-				EqualHole (-Width)
-				EqualHole 0
-
-		create-glyph 'ident.fc' : glyph-proc
-			Joining.set currentGlyph Joining.Classes.Right
-			include : difference
-				IdentShape SB (Width - joiningOverlap)
-				IdentHole Width
-
-		create-glyph 'ident.cf' : glyph-proc
-			Joining.set currentGlyph Joining.Classes.Left
-			include : difference
-				IdentShape joiningOverlap RightSB
-				IdentHole 0
-
-		create-glyph 'ident.jf' : glyph-proc
-			Joining.set currentGlyph Joining.Classes.Left
-			include : difference
-				IdentShape (RightSB - Width + joiningOverlap) RightSB
-				IdentHole 0
-
-		create-glyph 'ident.cc' : glyph-proc
-			Joining.set currentGlyph Joining.Classes.Mid
-			include : difference
-				IdentShape joiningOverlap (Width - joiningOverlap)
-				IdentHole 0
-				IdentHole Width
-
-		create-glyph 'ident.fc+cc' : glyph-proc
-			Joining.set currentGlyph Joining.Classes.Mid
-			include : difference
-				IdentShape (SB - Width) (Width - joiningOverlap)
-				IdentHole 0
-				IdentHole Width
-
-		create-glyph 'ident.fc+cf' : glyph-proc
-			Joining.set currentGlyph Joining.Classes.Left
-			include : difference
-				IdentShape (SB - Width) RightSB
-				IdentHole 0
-
-		create-glyph 'ident.cc+cf' : glyph-proc
-			Joining.set currentGlyph Joining.Classes.Left
-			include : difference
-				IdentShape (joiningOverlap - Width) RightSB
-				IdentHole (-Width)
-				IdentHole 0
 
 		### Inequality
-
-
-
 		define Neq : namespace
 			export : define Sw   OperatorStroke
 			export : define Dr : Sw / Stroke * DotRadius

params/variants.toml

@@ -6690,6 +6690,25 @@ selector."neq.bar-only"  = "moreSlanted"
 
 
 
+[prime.lig-equal-chain]
+sampler = "== "
+samplerExplain = "Equality ligations"
+tag = "VXAG"
+
+[prime.lig-equal-chain.variants.with-notch]
+rank = 1
+description = "The bars in equality (`==`, etc.) ligation have notches in the middle"
+selector."lig-equal" = "withNotch"
+selector."lig-ident"  = "withNotch"
+
+[prime.lig-equal-chain.variants.without-notch]
+rank = 2
+description = "The bars in equality (`==`, etc.) ligation do not have notches in the middle"
+selector."lig-equal" = "withoutNotch"
+selector."lig-ident"  = "withoutNotch"
+
+
+
 # This is a special variant selector that controls digit form
 [prime.digit-form]
 isSpecial = true
@@ -6824,6 +6843,7 @@ question = "smooth"
 punctuation-dot = "round"
 diacritic-dot = "round"
 lig-neq = "slightly-slanted"
+lig-equal-chain = "with-notch"
 
 # m, n, h has tailed variant, but not very ideal
 # Do not make them default
@@ -7209,6 +7229,7 @@ at = "short"
 cent = "open"
 percent = "rings-continuous-slash"
 lig-ltgteq = "slanted"
+lig-equal-chain = "without-notch"
 
 [composite.ss05.slab-override.design]
 capital-d = "more-rounded-bilateral-serifed"
@@ -7366,6 +7387,7 @@ at = "threefold"
 dollar = "open"
 cent = "open"
 percent = "dots"
+lig-equal-chain = "without-notch"
 
 [composite.ss08.italic]
 g = "single-storey-serifless"
@@ -7666,6 +7688,7 @@ percent = "rings-continuous-slash"
 lig-ltgteq = "slanted"
 question = "corner-flat-hooked"
 lig-neq = "more-slanted"
+lig-equal-chain = "without-notch"
 
 [composite.ss14.italic]
 a = "single-storey-serifless"

utility/generate-samples/templates/package-sample.mjs

@@ -5,7 +5,7 @@ const ssStrings = [
 	["ABC.DEF.GHI.JKL.MNO.PQRS.TUV.WXYZ", "abc.def.ghi.jkl.mno.pqrs.tuv.wxyz"],
 	["¢ ſß ΓΛΔ αδιλμξ КУЗЯЖэльфязычникж", "float il1[]={1-2/3.4,5+6=7/8%90};"],
 	["1234567890 ,._-+= >< ¯-¬_ >~–÷+×<", "{}[]()<>`+-=$*/#_%^@\\&|~?'\" !,.;:"],
-	["!iIlL17|¦ coO08BbDQ $5SZ2zsz 96G&", [..."dbqp E3 g9q CGQ vvw VVW ", "<=", " ", "!=", " ", ">="]]
+	["!iIlL17|¦ coO08BbDQ $5SZ2zsz 96G&", [..."dbqp E3 g9qCGQ vvwVVW ", "<=", " ", "!="," ","==", " ", ">="]]
 ];
 
 function* makeSample(lbm, hotChars) {

utility/generate-samples/templates/stylistic-set.mjs

@@ -5,7 +5,7 @@ const ssStrings = [
 	["ABC.DEF.GHI.JKL.MNO.PQRS.TUV.WXYZ", "abc.def.ghi.jkl.mno.pqrs.tuv.wxyz"],
 	["¢ ſß ΓΛΔ αδιλμξ КУЗЯЖэльфязычникж", "float il1[]={1-2/3.4,5+6=7/8%90};"],
 	["1234567890 ,._-+= >< ¯-¬_ >~–÷+×<", "{}[]()<>`+-=$*/#_%^@\\&|~?'\" !,.;:"],
-	["!iIlL17|¦ coO08BbDQ $5SZ2zsz 96G&", [..."dbqp E3 g9q CGQ vvw VVW ", "<=", " ", "!=", " ", ">="]]
+	["!iIlL17|¦ coO08BbDQ $5SZ2zsz 96G&", [..."dbqp E3 g9qCGQ vvwVVW ", "<=", " ", "!="," ","==", " ", ">="]]
 ];
 
 function* makeSample(theme, lbm, features, hotChars) {