🟥 Texture2D与Sprite互转

//转化后大小跟屏幕一样大
Sprite prite = Sprite.Create(要转换的Texture2D, 
            new Rect(0, 0, Screen.width, Screen.height),
            new Vector2(0.5f, 0.5f));
 
//保持原有大小
Sprite prite = Sprite.Create(原图片,
            new Rect(0, 0, 原图片.width, 原图片.height),
            new Vector2(0.5f, 0.5f));
 
//sprite为图集中的某个子Sprite对象
        var targetTex = new Texture2D((int)sprite.rect.width, (int)sprite.rect.height);
        var pixels = sprite.texture.GetPixels(
            (int)sprite.textureRect.x,
            (int)sprite.textureRect.y,
            (int)sprite.textureRect.width,
            (int)sprite.textureRect.height);
        targetTex.SetPixels(pixels);
        targetTex.Apply();

注意：

若想从Sprite转成Texture2D，如果你的Sprite是工程里的一张图片，

则该图片需勾选Read/Write Enabled 选项，否则会报 Texture ‘xxx’ is not readable 这个错误。

🟧 Texture和Texture2D转化

1️⃣ Texture转Texture2D

a、编辑器模式下

/// <summary>
/// 编辑器模式下Texture转换成Texture2D
/// </summary>
/// <param name="texture"></param>
/// <returns></returns>
private Texture2D TextureToTexture2D(Texture texture) {
    Texture2D texture2d = texture as Texture2D;
    UnityEditor.TextureImporter ti = (UnityEditor.TextureImporter)UnityEditor.TextureImporter.GetAtPath(UnityEditor.AssetDatabase.GetAssetPath(texture2d));
    //图片Read/Write Enable的开关
    ti.isReadable = true;　
    UnityEditor.AssetDatabase.ImportAsset(UnityEditor.AssetDatabase.GetAssetPath(texture2d));
    return texture2d;
}

b、运行模式下

/// <summary>
/// 运行模式下Texture转换成Texture2D
/// </summary>
/// <param name="texture"></param>
/// <returns></returns>
private Texture2D TextureToTexture2D(Texture texture) {
        Texture2D texture2D = new Texture2D(texture.width, texture.height, TextureFormat.RGBA32, false);
        RenderTexture currentRT = RenderTexture.active;
        RenderTexture renderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 32);
        Graphics.Blit(texture, renderTexture);
 
        RenderTexture.active = renderTexture;
        texture2D.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
        texture2D.Apply();
 
        RenderTexture.active = currentRT;
        RenderTexture.ReleaseTemporary(renderTexture);
 
        return texture2D;
}

2️⃣ Texture2D转Texture

Texture2D->Sprite->Texture

🟨 sprite 和 bytes[] 的互相转换

1️⃣ 从sprite 转换到bytes[]

     public byte[] GetByte(Sprite sp)
    {
        //转换成Texture
        Texture2D temp = sp.texture;
        //在转换成bytes
        byte[] photoByte = temp.EncodeToPNG();
        return photoByte;
    }

2️⃣ 从bytes[] 转换到Sprite

    public Sprite GetSprite(Byte[] bytes)
    {
        //先创建一个Texture2D对象，用于把流数据转成Texture2D
        Texture2D texture = new Texture2D(10, 10);
        texture.LoadImage(bytes);//流数据转换成Texture2D
        //创建一个Sprite,以Texture2D对象为基础
        Sprite sp = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), Vector2.zero);
        return sp;
    }

🟩 操作文件File类方法

读、写、移动、删除等 操作文件File类方法、文件操作相关类知识

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