Function transcode

webgl/gltf/BasisTextureLoader.js:440–516

( buffer )

	}

	function transcode( buffer ) {

		var basisFile = new _BasisFile( new Uint8Array( buffer ) );

		var width = basisFile.getImageWidth( 0, 0 );
		var height = basisFile.getImageHeight( 0, 0 );
		var levels = basisFile.getNumLevels( 0 );
		var hasAlpha = basisFile.getHasAlpha();

		function cleanup() {

			basisFile.close();
			basisFile.delete();

		}

		if ( ! hasAlpha ) {

			switch ( config.format ) {

				case 9: // Hardcoded: THREE.BasisTextureLoader.BASIS_FORMAT.cTFPVRTC1_4_RGBA
					config.format = 8; // Hardcoded: THREE.BasisTextureLoader.BASIS_FORMAT.cTFPVRTC1_4_RGB;
					break;
				default:
					break;

			}

		}

		if ( ! width || ! height || ! levels ) {

			cleanup();
			throw new Error( 'THREE.BasisTextureLoader:  Invalid .basis file' );

		}

		if ( ! basisFile.startTranscoding() ) {

			cleanup();
			throw new Error( 'THREE.BasisTextureLoader: .startTranscoding failed' );

		}

		var mipmaps = [];

		for ( var mip = 0; mip < levels; mip ++ ) {

			var mipWidth = basisFile.getImageWidth( 0, mip );
			var mipHeight = basisFile.getImageHeight( 0, mip );
			var dst = new Uint8Array( basisFile.getImageTranscodedSizeInBytes( 0, mip, config.format ) );

			var status = basisFile.transcodeImage(
				dst,
				0,
				mip,
				config.format,
				0,