UnityEditor.TextureImporter.DoesSourceTextureHaveAlpha C# (CSharp) Метод

        public extern bool DoesSourceTextureHaveAlpha();
        /// <summary>

        /**
         * Does two things:
         * 1 - Changes the NPOT strategy to "ToNearest";
         * 2 - Changes the compression to DXT1 or DXT5 if compression is set to something different than DTX1.
         * It only changes the meta file of the texture.
         */
        static void DxtCompressTexture(TextureImporter textureImporter)
        {
            TextureImporterFormat format;
            TextureImporterSettings textureImporterSettings = new TextureImporterSettings();
            textureImporter.ReadTextureSettings(textureImporterSettings);
            format = textureImporterSettings.textureFormat;

            if (format != TextureImporterFormat.DXT1)
            {
                if (textureImporter.DoesSourceTextureHaveAlpha())
                    format = TextureImporterFormat.DXT5;
                else
                    format = TextureImporterFormat.DXT1;
            }

            textureImporter.npotScale = TextureImporterNPOTScale.ToNearest;

            textureImporterSettings.textureFormat = format;
            textureImporter.SetTextureSettings(textureImporterSettings);
        }