// THIRD_PARTY
// SOURCE:
// https://forum.unity.com/threads/generating-sprites-dynamically-from-png-or-jpeg-files-in-c.343735/

using UnityEngine;
using System.Collections;
using System.IO;

public static class ImageToSprite {

    //Static class instead of _instance
    // Usage from any other script:
    // MySprite = IMG2Sprite.LoadNewSprite(FilePath, [PixelsPerUnit (optional)], [spriteType(optional)])

    public static Sprite LoadNewSprite(string FilePath, float PixelsPerUnit = 100.0f, SpriteMeshType spriteType = SpriteMeshType.FullRect) {

        // Load a PNG or JPG image from disk to a Texture2D, assign this texture to a new sprite and return its reference

        Texture2D SpriteTexture = LoadTexture(FilePath);
        if (SpriteTexture == null) {
            Debug.LogError("Failed to load texture from " + FilePath);
            return null;
        }
        Sprite NewSprite = Sprite.Create(SpriteTexture, new Rect(0, 0, SpriteTexture.width, SpriteTexture.height), new Vector2(0, 0), PixelsPerUnit, 0, spriteType);

        return NewSprite;
    }

    public static Sprite ConvertTextureToSprite(Texture2D texture, float PixelsPerUnit = 32.0f, SpriteMeshType spriteType = SpriteMeshType.FullRect) {
        // Converts a Texture2D to a sprite, assign this texture to a new sprite and return its reference

        Sprite NewSprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0, 0), PixelsPerUnit, 0, spriteType);

        return NewSprite;
    }

    public static Texture2D LoadTexture(string FilePath) {

        // Load a PNG or JPG file from disk to a Texture2D
        // Returns null if load fails

        Texture2D Tex2D;
        byte[] FileData;

        if (File.Exists(FilePath)) {
            FileData = File.ReadAllBytes(FilePath);
            Tex2D = new Texture2D(2, 2);           // Create new "empty" texture
            if (Tex2D.LoadImage(FileData))           // Load the imagedata into the texture (size is set automatically)
                return Tex2D;                 // If data = readable -> return texture
        }
        return null;                     // Return null if load failed
    }
}