Method init

external/basisu/transcoder/basisu_transcoder.cpp:16638–16917

	}

	bool ktx2_transcoder::init(const void* pData, uint32_t data_size)
	{
		clear();

		if (!pData)
		{
			BASISU_DEVEL_ERROR("ktx2_transcoder::init: pData is nullptr\n");
			assert(0);
			return false;
		}

		if (data_size <= sizeof(ktx2_header))
		{
			BASISU_DEVEL_ERROR("ktx2_transcoder::init: File is impossibly too small to be a valid KTX2 file\n");
			return false;
		}

		if (memcmp(pData, g_ktx2_file_identifier, sizeof(g_ktx2_file_identifier)) != 0)
		{
			BASISU_DEVEL_ERROR("ktx2_transcoder::init: KTX2 file identifier is not present\n");
			return false;
		}

		m_pData = static_cast<const uint8_t *>(pData);
		m_data_size = data_size;

		memcpy((void*)&m_header, pData, sizeof(m_header));

		// We only support UASTC and ETC1S
		if (m_header.m_vk_format != KTX2_VK_FORMAT_UNDEFINED)
		{
			BASISU_DEVEL_ERROR("ktx2_transcoder::init: KTX2 file must be in ETC1S or UASTC format\n");
			return false;
		}

		// 3.3: "When format is VK_FORMAT_UNDEFINED, typeSize must equal 1."
		if (m_header.m_type_size != 1)
		{
			BASISU_DEVEL_ERROR("ktx2_transcoder::init: Invalid type_size\n");
			return false;
		}

		// We only currently support 2D textures (plain, cubemapped, or texture array), which is by far the most common use case.
		// The BasisU library does not support 1D or 3D textures at all.
		if ((m_header.m_pixel_width < 1) || (m_header.m_pixel_height < 1) || (m_header.m_pixel_depth > 0))
		{
			BASISU_DEVEL_ERROR("ktx2_transcoder::init: Only 2D or cubemap textures are supported\n");
			return false;
		}

		// Face count must be 1 or 6
		if ((m_header.m_face_count != 1) && (m_header.m_face_count != 6))
		{
			BASISU_DEVEL_ERROR("ktx2_transcoder::init: Invalid face count, file is corrupted or invalid\n");
			return false;
		}

		if (m_header.m_face_count > 1)