curioustorvald/Terrarum-sans-bitmap
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contextual devanagari anusvara positioning

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minjaesong
2026-03-01 10:46:39 +09:00
parent b78b4711fb
commit 95fafe51a9
6 changed files with 197 additions and 9 deletions
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src/assets/devanagari_variable.tga LFS
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32
src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt
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@@ -1235,7 +1235,10 @@ class TerrarumSansBitmap(
if (!itsProp.diacriticsAnchors[diacriticsType].xUsed) itsProp.width.div(2) else itsProp.diacriticsAnchors[diacriticsType].x
if (itsProp.alignWhere == GlyphProps.ALIGN_RIGHT) {
posXbuffer[nonDiacriticCounter] + anchorPoint + (itsProp.width + 1).div(2)
if (thisChar in 0x900..0x902)
posXbuffer[nonDiacriticCounter] + anchorPoint + (itsProp.width - 1).div(2)
else
posXbuffer[nonDiacriticCounter] + anchorPoint + (itsProp.width + 1).div(2)
} else {
if (thisChar in 0x900..0x902)
posXbuffer[nonDiacriticCounter] + anchorPoint - (W_VAR_INIT + 1) / 2
@@ -1246,6 +1249,19 @@ class TerrarumSansBitmap(
else -> throw InternalError("Unsupported alignment: ${thisProp.alignWhere}")
}
// Lower Anusvara: shift right when after certain vowels or reph
if (thisChar == DEVANAGARI_ANUSVARA_LOWER) {
val prev = str.getOrElse(charIndex - 1) { -1 }
val hasSimpleReph = prev == DEVANAGARI_RA_SUPER
val hasComplexReph = prev == DEVANAGARI_RA_SUPER_COMPLEX
val hasReph = hasSimpleReph || hasComplexReph
val effectivePrev = if (hasReph) str.getOrElse(charIndex - 2) { -1 } else prev
if (effectivePrev == 0x094F || hasComplexReph) {
posXbuffer[charIndex] += 3
} else if (effectivePrev in intArrayOf(0x093A, 0x0948, 0x094C) || hasSimpleReph) {
posXbuffer[charIndex] += 2
}
}
// set Y pos according to diacritics position
when (thisProp.stackWhere) {
@@ -1873,6 +1889,17 @@ class TerrarumSansBitmap(
seq4[i] = 0xF012F - ((w+1).coerceIn(4,19) - 4)
}
// Contextual Anusvara: use lower variant after certain vowels/reph
else if (c == 0x0902) {
val hasReph = cPrev == DEVANAGARI_RA_SUPER || cPrev == DEVANAGARI_RA_SUPER_COMPLEX
val effectivePrev = if (hasReph) seq4.getOrElse(i - 2) { -1 } else cPrev
// 094E (prishthamatra) is reordered before the consonant cluster,
// so scan backward to find it
val hasPrishthamatra = (1..5).any { j -> seq4.getOrElse(i - j) { -1 } == 0x094E }
if (effectivePrev in intArrayOf(0x093E, 0x0948, 0x094C, 0x094F) || hasPrishthamatra || hasReph) {
seq4[i] = DEVANAGARI_ANUSVARA_LOWER
}
}
i++
@@ -2770,10 +2797,13 @@ class TerrarumSansBitmap(
private const val MARWARI_LIG_DD_DD = 0xF01BA
private const val MARWARI_LIG_DD_DDH = 0xF01BB
// F016D is assigned as MARWARI_HALF_DD, referenced by compiler directives for MARWARI_LIG_DD_Y and MARWARI_HALFLIG_DD_Y
private const val MARWARI_LIG_DD_Y = 0xF016E
private const val MARWARI_HALFLIG_DD_Y = 0xF016F
private const val MARWARI_LIG_DD_R = 0xF010E
private const val DEVANAGARI_ANUSVARA_LOWER = 0xF016C
private const val SUNDANESE_ING = 0xF0500
private const val SUNDANESE_ENG = 0xF0501
private const val SUNDANESE_EUNG = 0xF0502