Synced opentype.c to AAT and more TODOs.

common/opentype.c

@@ -2,7 +2,8 @@
 #include "../ui.h"
 #include "uipriv.h"
 
-// note: each tag should only appear in quotes once; this allows automated tools to determine what we cover and don't cover
+// Notes:
+// - Each tag should only appear in quotes once; this allows automated tools to determine what we cover and don't cover
 
 typedef void (*specToOpenTypeEnumFunc)(const char *featureTag, uint32_t param, void *data);
 
@@ -15,6 +16,15 @@ static void boolspec(uiAttributeSpec *spec, const char *featureTag, specToOpenTy
 	(*f)(featureTag, 0, data);
 }
 
+static void boolspecnot(uiAttributeSpec *spec, const char *featureTag, specToOpenTypeEnumFunc f, void *data)
+{
+	if (spec->Value == 0) {
+		(*f)(featureTag, 1, data);
+		return;
+	}
+	(*f)(featureTag, 0, data);
+}
+
 void specToOpenType(uiAttributeSpec *spec, specToOpenTypeEnumFunc f, void *data)
 {
 	switch (spec->Type) {
@@ -32,11 +42,25 @@ void specToOpenType(uiAttributeSpec *spec, specToOpenTypeEnumFunc f, void *data)
 		return;
 	case uiAttributeHistoricalLigatures:
 		boolspec(spec, "hlig", f, data);
+		// This technically isn't what is meant by "historical ligatures", but Core Text's internal AAT-to-OpenType mapping says to include it, so we include it too
+		boolspec(spec, "hist", f, data);
 		return;
 	case uiAttributeUnicase:
 		boolspec(spec, "unic", f, data);
 		return;
 	// TODO is this correct or should we explicitly switch the rest off too?
+	case uiAttributeNumberSpacings:
+		// TODO does Core Text set both? do we?
+		switch (spec->Value) {
+		case uiAttributeNumberSpacingProportional:
+			(*f)("pnum", 1, data);
+			break;
+		case uiAttributeNumberSpacingTitling:
+			(*f)("tnum", 1, data);
+			break;
+		}
+		return;
+	// TODO is this correct or should we explicitly switch the rest off too?
 	case uiAttributeSuperscripts:
 		switch (spec->Value) {
 		case uiAttributeSuperscriptSuperscript:
@@ -73,6 +97,9 @@ void specToOpenType(uiAttributeSpec *spec, specToOpenTypeEnumFunc f, void *data)
 	case uiAttributeOrnamentalForms:
 		(*f)("ornm", (uint32_t) (spec->Value), data);
 		return;
+	case uiAttributeSpecificCharacterForm:
+		(*f)("aalt", (uint32_t) (spec->Value), data);
+		return;
 	case uiAttributeTitlingCapitalForms:
 		boolspec(spec, "titl", data);
 		return;
@@ -113,6 +140,12 @@ void specToOpenType(uiAttributeSpec *spec, specToOpenTypeEnumFunc f, void *data)
 		return;
 	case uiAttributeLowercaseNumbers:
 		boolspec(spec, "onum", data);
+		// Core Text's internal AAT-to-OpenType mapping says to include this, so we include it too
+		// TODO is it always set?
+		boolspecnot(spec, "lnum", data);
+		return;
+	case uiAttributeHanjaToHangul:
+		boolspec(spec, "hngl", data);
 		return;
 	case uiAttributeGlyphAnnotations:
 		(*f)("nalt", (uint32_t) (spec->Value), data);
@@ -225,3 +258,26 @@ void specToOpenType(uiAttributeSpec *spec, specToOpenTypeEnumFunc f, void *data)
 		return;
 	}
 }
+
+// TODO missing that AAT uses directly:
+// - pkna, pwid, fwid, hwid, twid, qwid, palt, valt, vpal, halt, vhal, kern, vkrn (CJK width control)
+// - ruby
+// missing that AAT knows about:
+// - abvf, abvm, abvs, blwf, blwm, blws (baselines)
+// - akhn, dist, half, haln, nukt, rkrf, rphf, vatu (Devanagari support)
+// - ccmp (compositions)
+// - cjct, pres, pstf, psts (Indic script support)
+// - curs (cursive positioning)
+// - dnom, numr (fraction parts)
+// - falt, fina, init, isol, jalt, medi, mset (Arabic support)
+// 	- rclt (required contextual alternates)
+// - fin2, fin3, med2 (Syriac script support)
+// - lfbd, opbd, rtbd (optical bounds support)
+// - ljmo, tjmo, vjmo (Hangul Jamo support)
+// - locl (Cyrillic support)
+// - ltra, ltrm, rtla, rtlm (bidi support)
+// - mark, mkmk (mark positioning)
+// - pref (Khmer support)
+// - rand (random glyph selection candidates)
+// - salt (stylistic alternatives)
+// - size (sizing info)

ui_attrstr.h

@@ -76,11 +76,8 @@ _UI_ENUM(uiAttribute) {
 
 	// TODO uiAttributeLinguisticRearrangement,	// 0 = off, 1 = on
 
-	// AAT: if off, "monospaced number spacing"; if on, "proportional number spacing"
+	// TODO rename this
-	// OpenType: non-proportional numbers are called "tabular"
+	uiAttributeNumberSpacings,		// enum uiAttributeNumberSpacing
-	// TODO uiAttributeProportionalNumbers,	// 0 = off, 1 = on
-		// TODO kNumberSpacingType 0 or 1
-			// TODO really?
 
 	// TODO kSmartSwashType
 
@@ -106,7 +103,13 @@ _UI_ENUM(uiAttribute) {
 	uiAttributeOrnamentalForms,		// an integer from 0 to a font-specified upper bound
 	// TODO provide a function to get the upper bound?
 
-	// TODO kCharacterAlternativesType
+	// AAT calls this "character alternatives" and defines the
+	// following values:
+	// 0 = none
+	// OpenType calls this "access all alternates".
+	// TODO doesn't OpenType do the same about 0?
+	uiAttributeSpecificCharacterForm,	// an integer from 0 to a font-specified upper bound
+	// TODO provide a function to get the upper bound?
 
 	uiAttributeTitlingCapitalForms,		// 0 = off, 1 = on
 
@@ -119,7 +122,7 @@ _UI_ENUM(uiAttribute) {
 	// TODO kTextSpacingType
 	// see kKanaSpacingType below
 
-	// TODO kTransliterationType
+	uiAttributeHanjaToHangul,		// 0 = off, 1 = on
 
 	// AAT defines the following values:
 	// 0 = none
@@ -139,7 +142,7 @@ _UI_ENUM(uiAttribute) {
 
 	// TODO kKanaSpacingType
 	// TODO kIdeographicSpacingType
-	// should these be provided? CAN they be provided?
+	// can they be provided independently of kTextSpacingType? Core Text doesn't seem to
 
 	// TODO kUnicodeDecompositionType
 
@@ -211,6 +214,12 @@ _UI_ENUM(uiDrawUnderlineColor) {
 	uiDrawUnderlineColorAuxiliary,	// for instance, the color used by smart replacements on OS X
 };
 
+_UI_ENUM(uiAttributeNumberSpacing) {
+	uiAttributeNumberSpacingProportional,
+	// AAT calls this "monospaced"
+	uiAttributeNumberSpacingTabular,
+};
+
 _UI_ENUM(uiAttributeSuperscript) {
 	uiAttributeSuperscriptNone,
 	uiAttributeSuperscriptSuperscript,		// AAT: "superior"