Skiko changes needed to ramp up compose/native Text (#197)

* Skiko changes needed to ramp up compose/native Text
* Typed interop  array return on native in particular

skiko/src/commonMain/cpp/common.h

@@ -50,10 +50,16 @@ namespace skija {
     namespace RRect {
         SkRRect toSkRRect(KFloat left, KFloat top, KFloat right, KFloat bottom, KFloat* jradii, KInt size);
     }
+
+    namespace FontStyle {
+        SkFontStyle fromKotlin(KInt style);
+        KInt toKotlin(const SkFontStyle& fs);
+    }
 }
 
 std::unique_ptr<SkMatrix> skMatrix(KFloat* matrixArray);
 std::unique_ptr<SkM44> skM44(KFloat* matrixArray);
+SkString skString(KNativePointer str);
 
 template <typename T>
 inline T interopToPtr(KNativePointer ptr) {

skiko/src/commonMain/cpp/common_interop.cc

@@ -101,6 +101,15 @@ std::unique_ptr<SkM44> skM44(KFloat* matrixArray) {
     }
 }
 
+SkString skString(KInteropPointer s) {
+    char* str = reinterpret_cast<char *>(s);
+    if (str == nullptr) {
+        return SkString();
+    } else {
+        return SkString(str);
+    }
+}
+
 namespace skija {
     namespace RRect {
         SkRRect toSkRRect(KFloat left, KFloat top, KFloat right, KFloat bottom, KFloat* radii, KInt radiiSize) {
@@ -127,4 +136,13 @@ namespace skija {
             return rrect;
         }
     }
+    namespace FontStyle {
+        SkFontStyle fromKotlin(KInt style) {
+            return SkFontStyle(style & 0xFFFF, (style >> 16) & 0xFF, static_cast<SkFontStyle::Slant>((style >> 24) & 0xFF));
+        }
+
+        KInt toKotlin(const SkFontStyle& fs) {
+            return (static_cast<int>(fs.slant()) << 24)| (fs.width() << 16) | fs.weight();
+        }
+    }
 }

skiko/src/commonMain/cpp/generated/ManagedString.cc

@@ -13,21 +13,11 @@ SKIKO_EXPORT KNativePointer org_jetbrains_skia_ManagedString__1nGetFinalizer
     return reinterpret_cast<KNativePointer>((&deleteString));
 }
 
-
 SKIKO_EXPORT KNativePointer org_jetbrains_skia_ManagedString__1nMake
   (KInteropPointer textStr) {
-    TODO("implement org_jetbrains_skia_ManagedString__1nMake");
-}
-     
-#if 0 
-SKIKO_EXPORT KNativePointer org_jetbrains_skia_ManagedString__1nMake
-  (KInteropPointer textStr) {
-    SkString* text = new SkString(skString(env, textStr));
+    SkString* text = new SkString(skString(textStr));
     return reinterpret_cast<KNativePointer>(text);
 }
-#endif
-
-
 
 SKIKO_EXPORT KInteropPointer org_jetbrains_skia_ManagedString__1nToString
   (KNativePointer ptr) {
@@ -58,21 +48,11 @@ SKIKO_EXPORT void org_jetbrains_skia_ManagedString__1nInsert
 }
 #endif
 
-
-
-SKIKO_EXPORT void org_jetbrains_skia_ManagedString__1nAppend
-  (KNativePointer ptr, KInteropPointer s) {
-    TODO("implement org_jetbrains_skia_ManagedString__1nAppend");
-}
-     
-#if 0 
 SKIKO_EXPORT void org_jetbrains_skia_ManagedString__1nAppend
   (KNativePointer ptr, KInteropPointer s) {
     SkString* instance = reinterpret_cast<SkString*>((ptr));
-    instance->append(skString(env, s));
+    instance->append(skString(s));
 }
-#endif
-
 
 SKIKO_EXPORT void org_jetbrains_skia_ManagedString__1nRemoveSuffix
   (KNativePointer ptr, KInt from) {

skiko/src/commonMain/cpp/generated/paragraph/FontCollection.cc

@@ -20,37 +20,38 @@ SKIKO_EXPORT KInt org_jetbrains_skia_paragraph_FontCollection__1nGetFontManagers
     return instance->getFontManagersCount();
 }
 
-
-SKIKO_EXPORT void org_jetbrains_skia_paragraph_FontCollection__1nSetAssetFontManager
-  (KNativePointer ptr, KNativePointer fontManagerPtr, KInteropPointer defaultFamilyNameStr) {
-    TODO("implement org_jetbrains_skia_paragraph_FontCollection__1nSetAssetFontManager");
-}
-     
-#if 0 
 SKIKO_EXPORT void org_jetbrains_skia_paragraph_FontCollection__1nSetAssetFontManager
   (KNativePointer ptr, KNativePointer fontManagerPtr, KInteropPointer defaultFamilyNameStr) {
     FontCollection* instance = reinterpret_cast<FontCollection*>((ptr));
     SkFontMgr* fontManager = reinterpret_cast<SkFontMgr*>((fontManagerPtr));
     instance->setAssetFontManager(sk_ref_sp(fontManager));
 }
-#endif
-
-
 
 SKIKO_EXPORT void org_jetbrains_skia_paragraph_FontCollection__1nSetDynamicFontManager
-  (KNativePointer ptr, KNativePointer fontManagerPtr, KInteropPointer defaultFamilyNameStr) {
-    TODO("implement org_jetbrains_skia_paragraph_FontCollection__1nSetDynamicFontManager");
+  (KNativePointer ptr, KNativePointer fontManagerPtr, KNativePointer defaultFamilyNameStr) {
+    FontCollection* instance = reinterpret_cast<FontCollection*>((ptr));
+    SkFontMgr* fontManager = reinterpret_cast<SkFontMgr*>((fontManagerPtr));
+    instance->setDynamicFontManager(sk_ref_sp(fontManager));
 }
 
 SKIKO_EXPORT void org_jetbrains_skia_paragraph_FontCollection__1nSetTestFontManager
-  (KNativePointer ptr, KNativePointer fontManagerPtr, KInteropPointer defaultFamilyNameStr) {
-    TODO("implement org_jetbrains_skia_paragraph_FontCollection__1nSetTestFontManager");
+  (KNativePointer ptr, KNativePointer fontManagerPtr, KNativePointer defaultFamilyNameStr) {
+    FontCollection* instance = reinterpret_cast<FontCollection*>((ptr));
+    SkFontMgr* fontManager = reinterpret_cast<SkFontMgr*>((fontManagerPtr));
+    instance->setTestFontManager(sk_ref_sp(fontManager));
 }
 
-
 SKIKO_EXPORT void org_jetbrains_skia_paragraph_FontCollection__1nSetDefaultFontManager
-  (KNativePointer ptr, KNativePointer fontManagerPtr, KInteropPointer defaultFamilyNameStr) {
-    TODO("implement org_jetbrains_skia_paragraph_FontCollection__1nSetDefaultFontManager");
+  (KNativePointer ptr, KNativePointer fontManagerPtr, KNativePointer defaultFamilyNameStr) {
+    FontCollection* instance = reinterpret_cast<FontCollection*>((ptr));
+    SkFontMgr* fontManager = reinterpret_cast<SkFontMgr*>((fontManagerPtr));
+
+    if (defaultFamilyNameStr == nullptr)
+        instance->setDefaultFontManager(sk_ref_sp(fontManager));
+    else {
+        SkString defaultFamilyName = skString(defaultFamilyNameStr);
+        instance->setDefaultFontManager(sk_ref_sp(fontManager), defaultFamilyName.c_str());
+    }
 }
 
 SKIKO_EXPORT KNativePointer org_jetbrains_skia_paragraph_FontCollection__1nGetFallbackManager

skiko/src/commonMain/cpp/generated/paragraph/LineMetrics.cc

+#include "Paragraph.h"
+using namespace std;
+using namespace skia::textlayout;
+#include "common.h"
+
+SKIKO_EXPORT KInt org_jetbrains_skia_paragraph_LineMetrics__1nGetArraySize
+    (KNativePointer blob) {
+
+    std::vector<LineMetrics>* vect = reinterpret_cast<std::vector<LineMetrics> *>(blob);
+    return static_cast<KInt>(vect->size());
+}
+
+SKIKO_EXPORT void org_jetbrains_skia_paragraph_LineMetrics__1nDisposeArray
+    (KNativePointer blob) {
+
+    std::vector<LineMetrics>* vect = reinterpret_cast<std::vector<LineMetrics> *>(blob);
+    delete vect;
+}
+
+SKIKO_EXPORT void org_jetbrains_skia_paragraph_LineMetrics__1nGetArrayElement
+    (KNativePointer blob, KInt index, KNativePointer longArgs, KNativePointer doubleArgs) {
+
+    std::vector<LineMetrics>* vect = reinterpret_cast<std::vector<LineMetrics> *>(blob);
+    float* longs = reinterpret_cast<float *>(longArgs);
+    int* doubles = reinterpret_cast<int *>(doubleArgs);
+
+    LineMetrics lm = vect->at(index);
+
+    longs[0] = lm.fStartIndex;
+    longs[1] = lm.fEndIndex;
+    longs[2] = lm.fEndExcludingWhitespaces;
+    longs[3] = lm.fEndIncludingNewline;
+    longs[4] = lm.fHardBreak;
+    longs[5] = lm.fLineNumber;
+
+    doubles[0] = lm.fAscent;
+    doubles[1] = lm.fDescent;
+    doubles[2] = lm.fUnscaledAscent;
+    doubles[3] = lm.fHeight;
+    doubles[4] = lm.fWidth;
+    doubles[5] = lm.fLeft;
+    doubles[6] = lm.fBaseline;
+}

skiko/src/commonMain/cpp/generated/paragraph/Paragraph.cc

@@ -100,29 +100,12 @@ SKIKO_EXPORT KInteropPointerArray org_jetbrains_skia_paragraph_Paragraph__1nGetR
 }
 #endif
 
-
-
-SKIKO_EXPORT KInteropPointerArray org_jetbrains_skia_paragraph_Paragraph__1nGetRectsForPlaceholders
-  (KNativePointer ptr) {
-    TODO("implement org_jetbrains_skia_paragraph_Paragraph__1nGetRectsForPlaceholders");
-}
-     
-#if 0 
 SKIKO_EXPORT KInteropPointerArray org_jetbrains_skia_paragraph_Paragraph__1nGetRectsForPlaceholders
   (KNativePointer ptr) {
     Paragraph* instance = reinterpret_cast<Paragraph*>((ptr));
-    std::vector<TextBox> rects = instance->getRectsForPlaceholders();
-    KInteropPointerArray rectsArray = env->NewObjectArray((jsize) rects.size(), skija::paragraph::TextBox::cls, nullptr);
-    for (int i = 0; i < rects.size(); ++i) {
-        TextBox box = rects[i];
-        KInteropPointer boxObj = env->NewObject(skija::paragraph::TextBox::cls, skija::paragraph::TextBox::ctor, box.rect.fLeft, box.rect.fTop, box.rect.fRight, box.rect.fBottom, static_cast<KInt>(box.direction));
-        env->SetObjectArrayElement(rectsArray, i, boxObj);
-        env->DeleteLocalRef(boxObj);
-    }
-    return rectsArray;
+    std::vector<TextBox> *vect = new std::vector<TextBox>(instance->getRectsForPlaceholders());
+    return vect;
 }
-#endif
-
 
 SKIKO_EXPORT KInt org_jetbrains_skia_paragraph_Paragraph__1nGetGlyphPositionAtCoordinate
   (KNativePointer ptr, KFloat dx, KFloat dy) {
@@ -144,7 +127,12 @@ SKIKO_EXPORT KLong org_jetbrains_skia_paragraph_Paragraph__1nGetWordBoundary
 
 SKIKO_EXPORT KInteropPointerArray org_jetbrains_skia_paragraph_Paragraph__1nGetLineMetrics
   (KNativePointer ptr, KNativePointer textPtr) {
-    TODO("implement org_jetbrains_skia_paragraph_Paragraph__1nGetLineMetrics");
+    Paragraph* instance = reinterpret_cast<Paragraph*>((ptr));
+    SkString* text = reinterpret_cast<SkString*>((textPtr));
+
+    std::vector<LineMetrics>* res = new std::vector<LineMetrics>;
+    instance->getLineMetrics(*res);
+    return res;
 }
      
 SKIKO_EXPORT KInt org_jetbrains_skia_paragraph_Paragraph__1nGetLineNumber

skiko/src/commonMain/cpp/generated/paragraph/ParagraphBuilder.cc

@@ -38,21 +38,12 @@ SKIKO_EXPORT void org_jetbrains_skia_paragraph_ParagraphBuilder__1nPopStyle
     instance->pop();
 }
 
-
-SKIKO_EXPORT void org_jetbrains_skia_paragraph_ParagraphBuilder__1nAddText
-  (KNativePointer ptr, KInteropPointer textString) {
-    TODO("implement org_jetbrains_skia_paragraph_ParagraphBuilder__1nAddText");
-}
-     
-#if 0 
 SKIKO_EXPORT void org_jetbrains_skia_paragraph_ParagraphBuilder__1nAddText
   (KNativePointer ptr, KInteropPointer textString) {
     ParagraphBuilder* instance = reinterpret_cast<ParagraphBuilder*>((ptr));
-    SkString text = skString(env, textString);
+    SkString text = skString(textString);
     instance->addText(text.c_str(), text.size());
 }
-#endif
-
 
 SKIKO_EXPORT void org_jetbrains_skia_paragraph_ParagraphBuilder__1nAddPlaceholder
   (KNativePointer ptr, KFloat width, KFloat height, KInt alignment, KInt baselinePosition, KFloat baseline) {

skiko/src/commonMain/cpp/generated/paragraph/TextBox.cc

+#include "Paragraph.h"
+using namespace std;
+using namespace skia::textlayout;
+#include "common.h"
+
+SKIKO_EXPORT KInt org_jetbrains_skia_paragraph_TextBox__1nGetArraySize
+    (KNativePointer blob) {
+
+    std::vector<TextBox>* vect = reinterpret_cast<std::vector<TextBox> *>(blob);
+    return static_cast<KInt>(vect->size());
+}
+
+SKIKO_EXPORT void org_jetbrains_skia_paragraph_TextBox__1nDisposeArray
+    (KNativePointer blob) {
+
+    std::vector<TextBox>* vect = reinterpret_cast<std::vector<TextBox> *>(blob);
+    delete vect;
+}
+
+SKIKO_EXPORT void org_jetbrains_skia_paragraph_TextBox__1nGetArrayElement
+    (KNativePointer blob, KInt index, KNativePointer rectangleArray, KNativePointer directionArray) {
+
+    std::vector<TextBox>* vect = reinterpret_cast<std::vector<TextBox> *>(blob);
+    float* rectangle = reinterpret_cast<float *>(rectangleArray);
+    int* direction = reinterpret_cast<int *>(directionArray);
+
+    TextBox box = vect->at(index);
+    rectangle[0] = box.rect.fLeft;
+    rectangle[1] = box.rect.fTop;
+    rectangle[2] = box.rect.fRight;
+    rectangle[3] = box.rect.fBottom;
+    direction[0] = static_cast<int>(box.direction);
+}
+

skiko/src/commonMain/cpp/generated/paragraph/TextStyle.cc

@@ -123,36 +123,17 @@ SKIKO_EXPORT void org_jetbrains_skia_paragraph_TextStyle__1nSetDecorationStyle
     instance->setDecorationThicknessMultiplier(thicknessMultiplier);
 }
 
-
-SKIKO_EXPORT KInt org_jetbrains_skia_paragraph_TextStyle__1nGetFontStyle
-  (KNativePointer ptr) {
-    TODO("implement org_jetbrains_skia_paragraph_TextStyle__1nGetFontStyle");
-}
-     
-#if 0 
 SKIKO_EXPORT KInt org_jetbrains_skia_paragraph_TextStyle__1nGetFontStyle
   (KNativePointer ptr) {
     TextStyle* instance = reinterpret_cast<TextStyle*>((ptr));
-    return skija::FontStyle::toJava(instance->getFontStyle());
+    return skija::FontStyle::toKotlin(instance->getFontStyle());
 }
-#endif
-
-
 
-SKIKO_EXPORT void org_jetbrains_skia_paragraph_TextStyle__1nSetFontStyle
-  (KNativePointer ptr, KInt fontStyleValue) {
-    TODO("implement org_jetbrains_skia_paragraph_TextStyle__1nSetFontStyle");
-}
-     
-#if 0 
 SKIKO_EXPORT void org_jetbrains_skia_paragraph_TextStyle__1nSetFontStyle
   (KNativePointer ptr, KInt fontStyleValue) {
     TextStyle* instance = reinterpret_cast<TextStyle*>((ptr));
-    instance->setFontStyle(skija::FontStyle::fromJava(fontStyleValue));
+    instance->setFontStyle(skija::FontStyle::fromKotlin(fontStyleValue));
 }
-#endif
-
-
 
 SKIKO_EXPORT KInteropPointerArray org_jetbrains_skia_paragraph_TextStyle__1nGetShadows
   (KNativePointer ptr) {

skiko/src/commonMain/kotlin/org/jetbrains/skia/impl/Native.kt

@@ -38,6 +38,7 @@ expect class InteropScope() {
     fun InteropPointer.fromInterop(result: NativePointerArray)
     fun toInterop(stringArray: Array<String>?): InteropPointer
     fun InteropPointer.fromInteropNativePointerArray(): NativePointerArray
+    inline fun <reified T> InteropPointer.fromInterop(decoder: ArrayInteropDecoder<T>): Array<T>
     fun release()
 }
 
@@ -70,3 +71,9 @@ inline fun withResult(result: NativePointerArray, block: (InteropPointer) -> Uni
     handle.fromInterop(result)
     result
 }
+
+interface ArrayInteropDecoder<T> {
+    fun getArrayElement(array: InteropPointer, index: Int): T
+    fun getArraySize(array: InteropPointer): Int
+    fun disposeArray(array: InteropPointer)
+}

skiko/src/commonMain/kotlin/org/jetbrains/skia/paragraph/FontCollection.kt

@@ -65,11 +65,13 @@ class FontCollection internal constructor(ptr: NativePointer) : RefCnt(ptr) {
     fun setDefaultFontManager(fontMgr: FontMgr?, defaultFamilyName: String?): FontCollection {
         return try {
             Stats.onNativeCall()
+            interopScope {
                 _nSetDefaultFontManager(
                     _ptr,
                     getPtr(fontMgr),
-                defaultFamilyName
+                    toInterop(defaultFamilyName)
                 )
+            }
             this
         } finally {
             reachabilityBarrier(fontMgr)
@@ -151,7 +153,7 @@ private external fun _nSetDynamicFontManager(ptr: NativePointer, fontManagerPtr:
 private external fun _nSetTestFontManager(ptr: NativePointer, fontManagerPtr: NativePointer): NativePointer
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_FontCollection__1nSetDefaultFontManager")
-private external fun _nSetDefaultFontManager(ptr: NativePointer, fontManagerPtr: NativePointer, defaultFamilyName: String?): NativePointer
+private external fun _nSetDefaultFontManager(ptr: NativePointer, fontManagerPtr: NativePointer, defaultFamilyName: InteropPointer): NativePointer
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_FontCollection__1nGetFallbackManager")
 private external fun _nGetFallbackManager(ptr: NativePointer): NativePointer

skiko/src/commonMain/kotlin/org/jetbrains/skia/paragraph/LineMetrics.kt

 package org.jetbrains.skia.paragraph
 
+import org.jetbrains.skia.ExternalSymbolName
+import org.jetbrains.skia.impl.*
+
 class LineMetrics(
     /**
      * The index in the text buffer the line begins.
@@ -16,7 +19,8 @@ class LineMetrics(
     /**
      * The index in the text buffer the line begins.
      */
-    val endIncludingNewline: Long, val isHardBreak: Boolean,
+    val endIncludingNewline: Long,
+    val isHardBreak: Boolean,
     /**
      * The final computed ascent for the line. This can be impacted by the strut, height,
      * scaling, as well as outlying runs that are very tall. The top edge is
@@ -148,7 +152,41 @@ class LineMetrics(
         return result
     }
 
+    companion object : ArrayInteropDecoder<LineMetrics> {
+        override fun getArraySize(array: InteropPointer) = LineMetrics_nGetArraySize(array)
+        override fun disposeArray(array: InteropPointer) = LineMetrics_nDisposeArray(array)
+        override fun getArrayElement(array: InteropPointer, index: Int): LineMetrics {
+            val longArray = LongArray(6)
+            val doubleArray = DoubleArray(7)
+            val result = interopScope {
+                LineMetrics_nGetArrayElement(array, index, toInterop(longArray), toInterop(doubleArray))
+            }
+            return LineMetrics(
+                longArray[0],
+                longArray[1],
+                longArray[2],
+                longArray[3],
+                longArray[4] != 0L,
+                doubleArray[0],
+                doubleArray[1],
+                doubleArray[2],
+                doubleArray[3],
+                doubleArray[4],
+                doubleArray[5],
+                doubleArray[6],
+                longArray[5]
+            )
+        }
+    }
+
     override fun toString(): String {
         return "LineMetrics(_startIndex=$startIndex, _endIndex=$endIndex, _endExcludingWhitespaces=$endExcludingWhitespaces, _endIncludingNewline=$endIncludingNewline, _hardBreak=$isHardBreak, _ascent=$ascent, _descent=$descent, _unscaledAscent=$unscaledAscent, _height=$height, _width=$width, _left=$left, _baseline=$baseline, _lineNumber=$lineNumber)"
     }
 }
+
+@ExternalSymbolName("org_jetbrains_skia_paragraph_LineMetrics__1nGetArraySize")
+private external fun LineMetrics_nGetArraySize(array: InteropPointer): Int
+@ExternalSymbolName("org_jetbrains_skia_paragraph_LineMetrics__1nDisposeArray")
+private external fun LineMetrics_nDisposeArray(array: InteropPointer)
+@ExternalSymbolName("org_jetbrains_skia_paragraph_LineMetrics__1nGetArrayElement")
+private external fun LineMetrics_nGetArrayElement(array: InteropPointer, index: Int, longArgs: InteropPointer, doubleArgs: InteropPointer)

skiko/src/commonMain/kotlin/org/jetbrains/skia/paragraph/Paragraph.kt

@@ -3,12 +3,8 @@ package org.jetbrains.skia.paragraph
 
 import org.jetbrains.skia.impl.Library.Companion.staticLoad
 import org.jetbrains.skia.*
-import org.jetbrains.skia.impl.Managed
-import org.jetbrains.skia.impl.Stats
-import org.jetbrains.skia.impl.reachabilityBarrier
 import org.jetbrains.skia.ExternalSymbolName
-import org.jetbrains.skia.impl.NativePointer
-import org.jetbrains.skia.impl.getPtr
+import org.jetbrains.skia.impl.*
 
 class Paragraph internal constructor(ptr: NativePointer, text: ManagedString?) : Managed(ptr, _FinalizerHolder.PTR) {
     companion object {
@@ -122,7 +118,9 @@ class Paragraph internal constructor(ptr: NativePointer, text: ManagedString?) :
     val rectsForPlaceholders: Array<org.jetbrains.skia.paragraph.TextBox>
         get() = try {
             Stats.onNativeCall()
-            _nGetRectsForPlaceholders(_ptr)
+            interopScope {
+                _nGetRectsForPlaceholders(_ptr).fromInterop(TextBox)
+            }
         } finally {
             reachabilityBarrier(this)
         }
@@ -153,19 +151,21 @@ class Paragraph internal constructor(ptr: NativePointer, text: ManagedString?) :
 
     private fun toIRange(p: Long) = IRange((p ushr 32).toInt(), (p and -1).toInt())
 
-    val lineMetrics: Array<LineMetrics?>
+    val lineMetrics: Array<LineMetrics>
         get() = try {
             if (_text == null) {
-                arrayOfNulls(0)
+                arrayOf<LineMetrics>()
             } else {
                 Stats.onNativeCall()
-                _nGetLineMetrics(_ptr, getPtr(_text))
+                interopScope {
+                    _nGetLineMetrics(_ptr, getPtr(_text)).fromInterop(LineMetrics)
+                }
             }
         } finally {
             reachabilityBarrier(this)
             reachabilityBarrier(_text)
         }
-    val lineNumber: NativePointer
+    val lineNumber: Int
         get() = try {
             Stats.onNativeCall()
             _nGetLineNumber(_ptr)
@@ -310,7 +310,7 @@ private external fun _nGetRectsForRange(
 
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_Paragraph__1nGetRectsForPlaceholders")
-private external fun _nGetRectsForPlaceholders(ptr: NativePointer): Array<TextBox>
+private external fun _nGetRectsForPlaceholders(ptr: NativePointer): InteropPointer
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_Paragraph__1nGetGlyphPositionAtCoordinate")
 private external fun _nGetGlyphPositionAtCoordinate(ptr: NativePointer, dx: Float, dy: Float): Int
@@ -319,10 +319,10 @@ private external fun _nGetGlyphPositionAtCoordinate(ptr: NativePointer, dx: Floa
 private external fun _nGetWordBoundary(ptr: NativePointer, offset: Int): Long
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_Paragraph__1nGetLineMetrics")
-private external fun _nGetLineMetrics(ptr: NativePointer, textPtr: NativePointer): Array<LineMetrics?>
+private external fun _nGetLineMetrics(ptr: NativePointer, textPtr: NativePointer): InteropPointer
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_Paragraph__1nGetLineNumber")
-private external fun _nGetLineNumber(ptr: NativePointer): NativePointer
+private external fun _nGetLineNumber(ptr: NativePointer): Int
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_Paragraph__1nMarkDirty")
 private external fun _nMarkDirty(ptr: NativePointer)

skiko/src/commonMain/kotlin/org/jetbrains/skia/paragraph/ParagraphBuilder.kt

@@ -3,12 +3,8 @@ package org.jetbrains.skia.paragraph
 
 import org.jetbrains.skia.impl.Library.Companion.staticLoad
 import org.jetbrains.skia.ManagedString
-import org.jetbrains.skia.impl.Managed
-import org.jetbrains.skia.impl.Stats
-import org.jetbrains.skia.impl.reachabilityBarrier
 import org.jetbrains.skia.ExternalSymbolName
-import org.jetbrains.skia.impl.NativePointer
-import org.jetbrains.skia.impl.getPtr
+import org.jetbrains.skia.impl.*
 
 class ParagraphBuilder(style: ParagraphStyle?, fc: FontCollection?) :
     Managed(_nMake(getPtr(style), getPtr(fc)), _FinalizerHolder.PTR) {
@@ -37,7 +33,9 @@ class ParagraphBuilder(style: ParagraphStyle?, fc: FontCollection?) :
 
     fun addText(text: String): ParagraphBuilder {
         Stats.onNativeCall()
-        _nAddText(_ptr, text)
+        interopScope {
+            _nAddText(_ptr, toInterop(text))
+        }
         if (_text == null) _text = ManagedString(text) else _text!!.append(text)
         return this
     }
@@ -100,7 +98,7 @@ private external fun _nPushStyle(ptr: NativePointer, textStylePtr: NativePointer
 private external fun _nPopStyle(ptr: NativePointer)
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_ParagraphBuilder__1nAddText")
-private external fun _nAddText(ptr: NativePointer, text: String?)
+private external fun _nAddText(ptr: NativePointer, text: InteropPointer)
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_ParagraphBuilder__1nAddPlaceholder")
 private external fun _nAddPlaceholder(

skiko/src/commonMain/kotlin/org/jetbrains/skia/paragraph/ParagraphStyle.kt

@@ -103,7 +103,7 @@ class ParagraphStyle : Managed(ParagraphStyle_nMake(), _FinalizerHolder.PTR) {
         return this
     }
 
-    var maxLinesCount: NativePointer
+    var maxLinesCount: Int
         get() = try {
             Stats.onNativeCall()
             _nGetMaxLinesCount(_ptr)
@@ -114,7 +114,7 @@ class ParagraphStyle : Managed(ParagraphStyle_nMake(), _FinalizerHolder.PTR) {
             setMaxLinesCount(value)
         }
 
-    fun setMaxLinesCount(count: NativePointer): ParagraphStyle {
+    fun setMaxLinesCount(count: Int): ParagraphStyle {
         Stats.onNativeCall()
         _nSetMaxLinesCount(_ptr, count)
         return this
@@ -240,10 +240,10 @@ private external fun _nGetAlignment(ptr: NativePointer): Int
 private external fun _nSetAlignment(ptr: NativePointer, align: Int)
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_ParagraphStyle__1nGetMaxLinesCount")
-private external fun _nGetMaxLinesCount(ptr: NativePointer): NativePointer
+private external fun _nGetMaxLinesCount(ptr: NativePointer): Int
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_ParagraphStyle__1nSetMaxLinesCount")
-private external fun _nSetMaxLinesCount(ptr: NativePointer, maxLines: NativePointer)
+private external fun _nSetMaxLinesCount(ptr: NativePointer, maxLines: Int)
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_ParagraphStyle__1nGetEllipsis")
 private external fun _nGetEllipsis(ptr: NativePointer): String

skiko/src/commonMain/kotlin/org/jetbrains/skia/paragraph/TextBox.kt

 package org.jetbrains.skia.paragraph
 
 import org.jetbrains.skia.*
+import org.jetbrains.skia.impl.*
 
 class TextBox(val rect: Rect, direction: Direction) {
     val _direction: Direction
@@ -47,4 +48,24 @@ class TextBox(val rect: Rect, direction: Direction) {
     init {
         _direction = direction
     }
+
+    companion object : ArrayInteropDecoder<TextBox> {
+        override fun getArrayElement(array: InteropPointer, index: Int): TextBox {
+            val rect = FloatArray(4)
+            val direction = IntArray(1)
+            interopScope {
+                TextBox_nGetArrayElement(array, index, toInterop(rect), toInterop(direction))
+            }
+            return TextBox(rect[0], rect[1], rect[2], rect[3], direction[0])
+        }
+        override fun getArraySize(array: InteropPointer) = TextBox_nGetArraySize(array)
+        override fun disposeArray(array: InteropPointer) = TextBox_nDisposeArray(array)
+    }
 }
+
+@ExternalSymbolName("org_jetbrains_skia_paragraph_TextBox__1nGetArraySize")
+private external fun TextBox_nGetArraySize(array: InteropPointer): Int
+@ExternalSymbolName("org_jetbrains_skia_paragraph_TextBox__1nDisposeArray")
+private external fun TextBox_nDisposeArray(array: InteropPointer)
+@ExternalSymbolName("org_jetbrains_skia_paragraph_TextBox__1nGetArrayElement")
+private external fun TextBox_nGetArrayElement(array: InteropPointer, index: Int, rectArray: InteropPointer, directionArray: InteropPointer)

skiko/src/commonMain/kotlin/org/jetbrains/skia/paragraph/TextStyle.kt

@@ -3,13 +3,8 @@ package org.jetbrains.skia.paragraph
 
 import org.jetbrains.skia.impl.Library.Companion.staticLoad
 import org.jetbrains.skia.*
-import org.jetbrains.skia.impl.Managed
-import org.jetbrains.skia.impl.Native
-import org.jetbrains.skia.impl.Stats
-import org.jetbrains.skia.impl.reachabilityBarrier
 import org.jetbrains.skia.ExternalSymbolName
-import org.jetbrains.skia.impl.NativePointer
-import org.jetbrains.skia.impl.getPtr
+import org.jetbrains.skia.impl.*
 
 class TextStyle internal constructor(ptr: NativePointer) : Managed(ptr, _FinalizerHolder.PTR) {
     companion object {
@@ -243,7 +238,9 @@ class TextStyle internal constructor(ptr: NativePointer) : Managed(ptr, _Finaliz
 
     fun setFontFamilies(families: Array<String>?): TextStyle {
         Stats.onNativeCall()
-        _nSetFontFamilies(_ptr, families)
+        interopScope {
+            _nSetFontFamilies(_ptr, toInterop(families))
+        }
         return this
     }
 
@@ -470,7 +467,7 @@ private external fun _nAddFontFeature(ptr: NativePointer, name: String?, value:
 private external fun _nClearFontFeatures(ptr: NativePointer)
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_TextStyle__1nSetFontFamilies")
-private external fun _nSetFontFamilies(ptr: NativePointer, families: Array<String>?)
+private external fun _nSetFontFamilies(ptr: NativePointer, families: InteropPointer)
 
 @ExternalSymbolName("org_jetbrains_skia_paragraph_TextStyle__1nGetLetterSpacing")
 private external fun _nGetLetterSpacing(ptr: NativePointer): Float

skiko/src/jsMain/kotlin/org/jetbrains/skia/impl/Native.js.kt

@@ -142,6 +142,9 @@ actual class InteropScope actual constructor() {
         TODO("implement wasm fromInteropNativePointerArray")
     }
 
+    actual inline fun <reified T> InteropPointer.fromInterop(decoder: ArrayInteropDecoder<T>): Array<T> =
+        TODO("implement wasm fromInteropArray()")
+
     actual fun release()  {
         elements.forEach {
             _free(it)

skiko/src/jvmMain/kotlin/org/jetbrains/skia/impl/Native.jvm.kt

@@ -70,6 +70,7 @@ actual class InteropScope actual constructor() {
     actual fun toInterop(stringArray: Array<String>?): InteropPointer = stringArray
     actual fun InteropPointer.fromInteropNativePointerArray(): NativePointerArray =
         NativePointerArray((this as LongArray).size, this)
+    actual inline fun <reified T> InteropPointer.fromInterop(decoder: ArrayInteropDecoder<T>): Array<T> = this as Array<T>
     actual fun release() {}
 }
 

skiko/src/nativeMain/kotlin/org/jetbrains/skia/impl/Native.native.kt

@@ -35,7 +35,8 @@ actual fun reachabilityBarrier(obj: Any?) {
 actual class InteropScope actual constructor() {
     actual fun toInterop(string: String?): InteropPointer {
         return if (string != null) {
-            val pinned = string.pin()
+            // encodeToByteArray encodes to utf8
+            val pinned = string.encodeToByteArray().pin()
             elements.add(pinned)
             val result = pinned.addressOf(0).rawValue
             result
@@ -152,6 +153,15 @@ actual class InteropScope actual constructor() {
         return toInterop(nativePointerArray)
     }
 
+    actual inline fun <reified T> InteropPointer.fromInterop(decoder: ArrayInteropDecoder<T>): Array<T> {
+        val size = decoder.getArraySize(this)
+        val result = Array<T>(size) {
+            decoder.getArrayElement(this, it)
+        }
+        decoder.disposeArray(this)
+        return result
+    }
+
     actual fun InteropPointer.fromInteropNativePointerArray(): NativePointerArray {
         TODO("implement native fromInteropNativePointerArray")
     }