fix: nbsp not typesetted correctly

src/net/torvald/terrarumsansbitmap/MovableType.kt

@@ -6,6 +6,7 @@ import com.badlogic.gdx.utils.Disposable
 import net.torvald.terrarumsansbitmap.gdx.CodePoint
 import net.torvald.terrarumsansbitmap.gdx.CodepointSequence
 import net.torvald.terrarumsansbitmap.gdx.TerrarumSansBitmap
+import net.torvald.terrarumsansbitmap.gdx.TerrarumSansBitmap.Companion.FIXED_BLOCK_1
 import net.torvald.terrarumsansbitmap.gdx.TerrarumSansBitmap.Companion.getHash
 import kotlin.math.*
 import kotlin.properties.Delegates
@@ -67,7 +68,7 @@ class MovableType(
 //        println("Paper width: $paperWidth")
 
         val lines = inputText.tokenise()
-//        lines.debugprint()
+        lines.debugprint()
 
         lines.forEachIndexed { linenum, it ->
 //            println("Processing input text line ${linenum + 1} (word count: ${it.size})...")
@@ -913,6 +914,8 @@ class MovableType(
                 "{SHY}"
             else if (it == ZWSP)
                 "{ZWSP}"
+            else if (it in FIXED_BLOCK_1..FIXED_BLOCK_1+15)
+                " <block ${it - FIXED_BLOCK_1 + 1}>"
             else if (it in GLUE_NEGATIVE_ONE..GLUE_POSITIVE_SIXTEEN)
                 " <glue ${it.glueCharToGlueSize()}> "
             else if (it in 0xF0541..0xF055A) {

src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt

@@ -192,6 +192,7 @@ class TerrarumSansBitmap(
 
     /** Props of all printable Unicode points. */
     private val glyphProps = HashMap<CodePoint, GlyphProps>()
+    private val textReplaces = HashMap<CodePoint, CodePoint>()
     private val sheets: Array<PixmapRegionPack>
 
 //    private var charsetOverride = 0
@@ -267,6 +268,8 @@ class TerrarumSansBitmap(
             buildWidthTableFixed()
             buildWidthTableInternal()
 
+            setupDynamicTextReplacer()
+
             glyphProps[0xAD] = GlyphProps(-15) // what the fuck's going on that made this necessary??
 
 
@@ -772,6 +775,13 @@ class TerrarumSansBitmap(
         }
     }
 
+    private fun setupDynamicTextReplacer() {
+        // replace NBSP into a block of same width
+        val spaceWidth = glyphProps[32]?.width ?: throw IllegalStateException()
+        if (spaceWidth > 16) throw InternalError("Space (U+0020) character is too wide ($spaceWidth)")
+        textReplaces[0xA0] = FIXED_BLOCK_1 + (spaceWidth - 1)
+    }
+
     fun getWidth(text: String) = getWidthNormalised(text.toCodePoints())
     fun getWidth(s: CodepointSequence) = getWidthNormalised(s.normalise())
 
@@ -1055,9 +1065,14 @@ class TerrarumSansBitmap(
 
         seq0.add(0)
         while (i < dis.size) {
-            val c = dis[i]
+            var c = dis[i]
             val cNext = dis.getOrElse(i+1) { -1 }
 
+            // replace characters in-line
+            textReplaces[c]?.let {
+                c = it
+            }
+
             // turn Unicode Devanagari consonants into the internal counterpart
             if (c in 0x0915..0x0939 || c in 0x0958..0x095F)
                 if (cNext == DEVANAGARI_NUQTA) {