From a79bbbaa6aa1ae4fe14f0617adb64478673956ea Mon Sep 17 00:00:00 2001
From: "H. Utku Maden" <utkumaden@hotmail.com>
Date: Sat, 29 Jun 2024 14:27:29 +0300
Subject: [PATCH] Explicitly set some structure layouts.

---
 Structures.cs | 113 ++++++++++++++++++++++++++------------------------
 1 file changed, 58 insertions(+), 55 deletions(-)

diff --git a/Structures.cs b/Structures.cs
index 0dcc1f3..2f2594a 100644
--- a/Structures.cs
+++ b/Structures.cs
@@ -40,32 +40,33 @@ namespace ReFuel.FreeType
         public long YMax;
     }
 
+    [StructLayout(LayoutKind.Explicit, Size = 248)]
     internal struct FTFaceInternal
     {
-        public long NumberOfFaces;
-        public long FaceIndex;
-        public long FaceFlags;
-        public long StyleFlags;
-        public long NumberOfGlyphs;
-        public IntPtr FamilyName;
-        public IntPtr StyleName;
-        public int NumberOfFixedSizes;
-        public IntPtr AvailableSizes;
-        public int NumberOfCharMaps;
-        public IntPtr Charmaps;
-        public FTGeneric Generic;
-        public FTBox BoundingBox;
-        public ushort UnitsPerEm;
-        public short Ascender;
-        public short Descender;
-        public short Height;
-        public short MaxAdvanceWidth;
-        public short MaxAdvanceHeight;
-        public short UnderlinePosition;
-        public short UnderlineThickness;
-        public FTGlyphSlot Glyph;
-        public IntPtr Size;
-        public IntPtr Charmap;
+        [FieldOffset(0)] public long NumberOfFaces;
+        [FieldOffset(8)] public long FaceIndex;
+        [FieldOffset(16)] public long FaceFlags;
+        [FieldOffset(24)] public long StyleFlags;
+        [FieldOffset(32)] public long NumberOfGlyphs;
+        [FieldOffset(40)] public IntPtr FamilyName;
+        [FieldOffset(48)] public IntPtr StyleName;
+        [FieldOffset(56)] public int NumberOfFixedSizes;
+        [FieldOffset(64)] public IntPtr AvailableSizes;
+        [FieldOffset(72)] public int NumberOfCharMaps;
+        [FieldOffset(80)] public IntPtr Charmaps;
+        [FieldOffset(88)] public FTGeneric Generic;
+        [FieldOffset(104)] public FTBox BoundingBox;
+        [FieldOffset(136)] public ushort UnitsPerEm;
+        [FieldOffset(138)] public short Ascender;
+        [FieldOffset(140)] public short Descender;
+        [FieldOffset(142)] public short Height;
+        [FieldOffset(144)] public short MaxAdvanceWidth;
+        [FieldOffset(146)] public short MaxAdvanceHeight;
+        [FieldOffset(148)] public short UnderlinePosition;
+        [FieldOffset(150)] public short UnderlineThickness;
+        [FieldOffset(152)] public FTGlyphSlot Glyph;
+        [FieldOffset(160)] public IntPtr Size;
+        [FieldOffset(168)] public IntPtr Charmap;
 
         // Rest of the struct is private to implementation.
     }
@@ -82,52 +83,54 @@ namespace ReFuel.FreeType
         public long Y;
     }
 
+    [StructLayout(LayoutKind.Explicit)]
     public struct FTBitmap
     {
-        public uint Rows;
-        public uint Width;
-        public int Pitch;
-        public IntPtr Buffer;
-        public ushort NumberOfGrays;
-        public byte PixelMode;
-        public byte PaletteMode;
-        public IntPtr Palette;
+        [FieldOffset(0)] public uint Rows;
+        [FieldOffset(4)] public uint Width;
+        [FieldOffset(8)] public int Pitch;
+        [FieldOffset(16)] public IntPtr Buffer;
+        [FieldOffset(24)] public ushort NumberOfGrays;
+        [FieldOffset(26)] public byte PixelMode;
+        [FieldOffset(27)] public byte PaletteMode;
+        [FieldOffset(32)] public IntPtr Palette;
     }
 
     public struct FTOutline
     {
         public short NumberOfContours;
-        public short NumberOfPoints;
+        public short NumberOfPoints;    
         public IntPtr Points;
         public IntPtr Tags;
         public IntPtr Contours;
         public int Flags;
     }
 
+    [StructLayout(LayoutKind.Explicit, Size = 296)]
     internal struct FTGlyphSlotInternal
     {
-        public FTLibrary Library;
-        public FTFace Face;
-        public FTGlyphSlot Next;
-        public uint GlyphIndex;
-        public FTGeneric Generic;
-        public FTGlyphMetrics Metrics;
-        public int LinearHorizontalAdvance;
-        public int LinearVerticalAdvance;
-        public FTVector Advance;
-        public int Format;
-        public FTBitmap Bitmap;
-        public int BitmapLeft;
-        public int BitmapTop;
-        public FTOutline Outline;
-        public uint NumberOfSubGlyphs;
-        public IntPtr SubGlyphs;
-        public IntPtr ControlData;
-        public long ControlLength;
-        public long LsbDelta;
-        public long RsbDelta;
-        public IntPtr Other;
-        public IntPtr Internal;
+        [FieldOffset(0)] public FTLibrary Library;
+        [FieldOffset(8)] public FTFace Face;
+        [FieldOffset(16)] public FTGlyphSlot Next;
+        [FieldOffset(24)] public uint GlyphIndex;
+        [FieldOffset(32)] public FTGeneric Generic;
+        [FieldOffset(48)] public FTGlyphMetrics Metrics;
+        [FieldOffset(112)] public int LinearHorizontalAdvance;
+        [FieldOffset(116)] public int LinearVerticalAdvance;
+        [FieldOffset(120)] public FTVector Advance;
+        [FieldOffset(136)] public int Format;
+        [FieldOffset(144)] public FTBitmap Bitmap;
+        [FieldOffset(184)] public int BitmapLeft;
+        [FieldOffset(188)] public int BitmapTop;
+        [FieldOffset(192)] public FTOutline Outline;
+        [FieldOffset(232)] public uint NumberOfSubGlyphs;
+        [FieldOffset(240)] public IntPtr SubGlyphs;
+        [FieldOffset(248)] public IntPtr ControlData;
+        [FieldOffset(256)] public long ControlLength;
+        [FieldOffset(264)] public long LsbDelta;
+        [FieldOffset(272)] public long RsbDelta;
+        [FieldOffset(280)] public IntPtr Other;
+        [FieldOffset(288)] public IntPtr Internal;
     }
 
     public unsafe struct FTGlyphSlot