MiraAPI/MiraAPI/Utilities/Assets/SpriteTools.cs

using System;
using System.Reflection;
using Il2CppInterop.Runtime;
using Il2CppInterop.Runtime.InteropTypes.Arrays;
using Reactor.Utilities;
using Reactor.Utilities.Extensions;
using UnityEngine;

namespace MiraAPI.Utilities.Assets;

/// <summary>
/// A utility class for various sprite-related operations.
/// </summary>
public static class SpriteTools
{
    private delegate bool DLoadImage(IntPtr tex, IntPtr data, bool markNonReadable);

    private static DLoadImage? _iCallLoadImage;

    /// <summary>
    /// Load an image into a texture.
    /// </summary>
    /// <param name="tex">The texture.</param>
    /// <param name="data">Byte data of image.</param>
    /// <param name="markNonReadable">Mark nonreadable.</param>
    /// <returns>True if succeeded.</returns>
    public static bool LoadImage(Texture2D tex, byte[] data, bool markNonReadable)
    {
        _iCallLoadImage ??= IL2CPP.ResolveICall<DLoadImage>("UnityEngine.ImageConversion::LoadImage");

        var il2CPPArray = (Il2CppStructArray<byte>)data;

        return _iCallLoadImage.Invoke(tex.Pointer, il2CPPArray.Pointer, markNonReadable);
    }

    /// <summary>
    /// Load a sprite from a resource path.
    /// </summary>
    /// <param name="resourcePath">The path to the resource.</param>
    /// <returns>A sprite made from the resource.</returns>
    /// <exception cref="Exception">The resource cannot be found.</exception>
    public static Sprite LoadSpriteFromPath(string resourcePath, Assembly assembly)
    {
        var tex = new Texture2D(1, 1, TextureFormat.ARGB32, false);
        var myStream = assembly.GetManifestResourceStream(resourcePath);
        if (myStream != null)
        {
            var buttonTexture = myStream.ReadFully();
            LoadImage(tex, buttonTexture, false);
        }
        else
        {
            Logger<MiraApiPlugin>.Error($"Resource not found: {resourcePath}\nReturning empty sprite!");
        }

        return Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), new Vector2(0.5f, 0.5f));
    }
}