如何在Unity中EncodeToPng压缩纹理

您必须先对其解压缩，然后再对其使用EncodeToPNG。您应该可以使用RenderTexture。复制压缩Texture2D到RenderTexture。分配RenderTexture，RenderTexture.active然后用于ReadPixels将像素从像素复制RenderTexture到Texture2D您希望采用解压缩格式的新像素。现在，您可以使用EncodeToPNG它了。

辅助函数可以做到这一点：

public static class ExtensionMethod
{
    public static Texture2D DeCompress(this Texture2D source)
    {
        RenderTexture renderTex = RenderTexture.GetTemporary(
                    source.width,
                    source.height,
                    0,
                    RenderTextureFormat.Default,
                    RenderTextureReadWrite.Linear);

        Graphics.Blit(source, renderTex);
        RenderTexture previous = RenderTexture.active;
        RenderTexture.active = renderTex;
        Texture2D readableText = new Texture2D(source.width, source.height);
        readableText.ReadPixels(new Rect(0, 0, renderTex.width, renderTex.height), 0, 0);
        readableText.Apply();
        RenderTexture.active = previous;
        RenderTexture.ReleaseTemporary(renderTex);
        return readableText;
    }
}

用法：

创建一个压缩的纹理：

Texture2D tex = new Texture2D(recwidth, recheight, TextureFormat.RGB24, false);
tex.ReadPixels(rex, rdPXX, rdPXY);
tex.Apply();
tex.Compress(false);

从压缩的纹理创建一个新的解压缩的纹理：

Texture2D decopmpresseTex = tex.DeCompress();

编码为png

var bytes = decopmpresseTex.EncodeToPNG();