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Packages/com.voidbotz.fonepayunity/Runtime/QR/FonepayQRGenerator.cs

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+using UnityEngine;
+
+namespace Darkmatter.Fonepay
+{
+    /// <summary>
+    /// Pure C# QR Code generator. Byte mode, ECC L/M/Q/H, versions 1–10.
+    /// </summary>
+    public static partial class FonepayQRGenerator
+    {
+        public enum EccLevel { L, M, Q, H }
+
+        public static Texture2D GenerateTexture(string text, int pixelSize = 10,
+            EccLevel ecc = EccLevel.M, Color? darkColor = null, Color? lightColor = null)
+        {
+            bool[,] matrix = GenerateMatrix(text, ecc);
+            int size = matrix.GetLength(0);
+            int texSize = size * pixelSize;
+
+            var tex = new Texture2D(texSize, texSize, TextureFormat.RGBA32, false)
+            {
+                filterMode = FilterMode.Point,
+                wrapMode = TextureWrapMode.Clamp
+            };
+
+            Color dark = darkColor ?? Color.black;
+            Color light = lightColor ?? Color.white;
+
+            for (int row = 0; row < size; row++)
+            for (int col = 0; col < size; col++)
+            {
+                Color c = matrix[row, col] ? dark : light;
+                for (int py = 0; py < pixelSize; py++)
+                for (int px = 0; px < pixelSize; px++)
+                    tex.SetPixel(col * pixelSize + px,
+                        (size - 1 - row) * pixelSize + py, c);
+            }
+
+            tex.Apply();
+            return tex;
+        }
+
+        public static Sprite GenerateSprite(string text, int pixelSize = 10,
+            EccLevel ecc = EccLevel.M, Color? darkColor = null, Color? lightColor = null,
+            float pixelsPerUnit = 100f)
+        {
+            var tex = GenerateTexture(text, pixelSize, ecc, darkColor, lightColor);
+            var sprite = Sprite.Create(tex,
+                new Rect(0, 0, tex.width, tex.height),
+                new Vector2(0.5f, 0.5f),
+                pixelsPerUnit,
+                0, SpriteMeshType.FullRect);
+            sprite.name = "FonepayQR";
+            return sprite;
+        }
+
+        public static bool[,] GenerateMatrix(string text, EccLevel ecc = EccLevel.M)
+        {
+            byte[] data = System.Text.Encoding.UTF8.GetBytes(text);
+            var (version, ecBlocks) = ChooseVersion(data.Length, ecc);
+            byte[] codewords = BuildCodewords(data, version, ecc, ecBlocks);
+            return BuildMatrix(version, codewords);
+        }
+    }
+}