Method get_dfd

encoder/basisu_comp.cpp:4019–4202

	};
					
	bool basis_compressor::get_dfd(uint8_vec &dfd, const basist::ktx2_header &header)
	{
		BASISU_NOTE_UNUSED(header);

		const uint8_t* pDFD = nullptr;
		uint32_t dfd_len = 0;

		const bool is_xuastc_ldr = basis_tex_format_is_xuastc_ldr(m_fmt_mode);
		const bool is_astc_ldr = basis_tex_format_is_astc_ldr(m_fmt_mode);

		// TODO: This was writen before m_fmt_mode existed, refactor to use that exclusively instead.

		if (is_xuastc_ldr)
		{
			// XUASTC LDR 4x4-12x12
			pDFD = g_ktx2_xuastc_ldr_intermediate_dfd;
			dfd_len = sizeof(g_ktx2_xuastc_ldr_intermediate_dfd);
		}
		else if (is_astc_ldr)
		{
			// ASTC LDR 4x4-12x12
			pDFD = g_ktx2_astc_ldr_dfd;
			dfd_len = sizeof(g_ktx2_astc_ldr_dfd);
		}
		else if (m_params.m_uastc)
		{
			if (m_params.m_hdr)
			{
				switch (m_params.m_hdr_mode)
				{
				case hdr_modes::cUASTC_HDR_4X4:
				{
					assert(m_fmt_mode == basist::basis_tex_format::cUASTC_HDR_4x4);

					pDFD = g_ktx2_uastc_hdr_4x4_nonalpha_dfd;
					dfd_len = sizeof(g_ktx2_uastc_hdr_4x4_nonalpha_dfd);
					break;
				}
				case hdr_modes::cASTC_HDR_6X6:
				{
					assert(m_fmt_mode == basist::basis_tex_format::cASTC_HDR_6x6);

					pDFD = g_ktx2_astc_hdr_6x6_nonalpha_dfd;
					dfd_len = sizeof(g_ktx2_astc_hdr_6x6_nonalpha_dfd);
					break;
				}
				case hdr_modes::cUASTC_HDR_6X6_INTERMEDIATE:
				{
					assert(m_fmt_mode == basist::basis_tex_format::cUASTC_HDR_6x6_INTERMEDIATE);

					pDFD = g_ktx2_uastc_hdr_6x6_intermediate_nonalpha_dfd;
					dfd_len = sizeof(g_ktx2_uastc_hdr_6x6_intermediate_nonalpha_dfd);
					break;
				}
				default:
				{
					assert(0);
					return false;