From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language:to :references:from:in-reply-to:content-transfer-encoding; bh=OG9ZyKB3RuDrdes1sRbhWBdiYcTvKomtkOkpH7ZiYvQ=; b=pgshD1mpaOft4e6fsVld8mfmI4uQdaJOz98sKPvqF2ex+dsi057f3ehkM6WnPh0NHG g2nWfqX95kN/INylV8t242gkqg7gfg9Zo+8zSogF6SQuiTn5oorRordRcTNdHuO5VIfN VQpudxzJHOM32beudri0AH4uTVlo0nXY/ht4BvPNHHHyPJopolJxware1jK4E5CUMLPE F1eSxYfS5T4YYRY15ocEddUMLG0s0LlrOAFgo1WjHviALAkxp7svwq+KkbpBYGbBWg9u jSTrwDRo1Ed9mR5gMvrgbLY6NYBySDG90SJ4DisqqY+6qlwqPgE4+gpCDbtUltkKaUZs PjOw== Message-ID: Date: Mon, 25 Oct 2021 17:19:14 +0200 MIME-Version: 1.0 Content-Language: en-US References: <34184587.8yKaOjHuOU@cwolf-work> <1489e0d9-cacb-bd92-7985-9fef4afb02bb@gmail.com> <1880865.CGEiM1yXm4@cwolf-work> From: Till Kamppeter In-Reply-To: <1880865.CGEiM1yXm4@cwolf-work> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Printing-architecture] Deprecation of all modules except for everywhere List-Id: Printing architecture under linux List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: printing-architecture@lists.linux-foundation.org On 25/10/2021 16:36, Christian Wolf wrote: > Hello, > >> Classic CUPS printer drivers are replaced by Printer Applications and >> Printer Applications are emulations of IPP Everywhere printers. With >> trhis all printers will appear as IPP Everywhere (or driverless IPP) >> printers. The modern ones do this already by themselves, for the old >> ones we use Printer Applications. > > so, I see there is a fallback plan in place. If I understand this correctly, > one mainly sourced the usage of PPDs out into standalone applications so the > CUPS core is free of bloat. Makes sense. > Generally, Printer Applications do not use PPDs. One can use any architecture to get an emulation of an IPP printer. LPrint for example does not use PPD files internally, same for the sample Printer Application in the PAPPL project. For PostScript printers, where the manufacturer provides a PPD file, and also for classic CUPS drivers for old printers where I do not have access to for testing, the easiest way to go is to have an architecture which wraps the classic CUPS driver with its PPD files into a Printer Application. For this I have created the pappl-retrofit (https://github.com/OpenPrinting/pappl-retrofit) library with which I have maded my 4 Printer Applications to retro-fit practically all free software CUPS drivers which are available as *.deb packages in the Debian distribution. Till