Small performances improvement

tiny-engine/src/commonMain/kotlin/com/github/minigdx/tiny/graphic/PixelArray.kt

@@ -55,7 +55,7 @@ class PixelArray(val width: Pixel, val height: Pixel, val pixelFormat: Int = Pix
         assert(x in 0 until width) { "x ($x) has to be between 0 and $width (excluded)" }
         assert(y in 0 until height) { "y ($y) has to be between 0 and $height (excluded)" }
         val position = (x + y * width) * pixelFormat
-        tmp.forEachIndexed { index, _ ->
+        (0 until pixelFormat).forEach { index ->
             tmp[index] = pixels[position + index]
         }
         return tmp

tiny-engine/src/commonMain/kotlin/com/github/minigdx/tiny/lua/MapLib.kt

@@ -128,7 +128,7 @@ class MapLib(private val resourceAccess: GameResourceAccess, private val spriteS
                 arg1.checkint() to arg2.checkint()
             }
 
-            return LuaTable().apply {
+            return LuaTable(2, 2).apply {
                 set("x", valueOf(cx * spriteSize.first.toDouble()))
                 set("y", valueOf(cy * spriteSize.second.toDouble()))
             }
@@ -152,7 +152,7 @@ class MapLib(private val resourceAccess: GameResourceAccess, private val spriteS
                 arg1.checkint() to arg2.checkint()
             }
 
-            return LuaTable().apply {
+            return LuaTable(2, 2).apply {
                 set("cx", valueOf(floor(x / spriteSize.first.toDouble())))
                 set("cy", valueOf(floor(y / spriteSize.second.toDouble())))
             }

tiny-engine/src/commonMain/kotlin/com/github/minigdx/tiny/lua/ShapeLib.kt

@@ -658,7 +658,7 @@ class ShapeLib(private val resourceAccess: GameResourceAccess) : TwoArgFunction(
             }
             dither.call(previous)
 
-            return NONE
+            return NIL
         }
     }
 }