[Printing-architecture] OpenPrinting News

Zdenek Dohnal zdohnal at redhat.com
Tue Jun 4 11:24:12 UTC 2019


Hi all,

_Turn scp-dbus-service.py to C project update:_

Sobhan started to code one week earlier, he is currently working on
methods which dbus interface uses plus Makefile.

His github with project https://github.com/sobhaniiest/scp-dbus-service

On 6/4/19 12:41 PM, Till Kamppeter wrote:
> Hi,
>
> here is the newest development of the last month.
>
>    Till
>
> ----------
>
>
> Google Summer of Code 2019
> --------------------------
>
> Coding has started.
>
> I have discussed the architecture for the Printer Application
> framework with Dheeraj but he did not start coding yet as he still has
> exams.
>
> Tanmay has started early and progressed very well, having nearly
> finished his project of removing the use of unstable/undocumented APIs
> of Poppler in the pdftoraster filter of cups-filters. He has code up
> now for testing an debugging:
>
> https://github.com/tanmayanand44/cups-filters-gsoc19
>
> He asks for testing with the different color spaces and color depths.
>
>
> Google Summer of Code 2018
> --------------------------
>
> One of the projects which did not finish in time in the end of the
> GSoC made it finally upstream into cups-filters 1.24.0. Deepak
> Patankar finished his work on cups-browsed auto-selecting the
> destination printer for a job based on option/attribute settings.
>
> Now, after one year of cups-browsed not receiving any new feature we
> have not only the auto selection but also support for clustering
> native IPP printers, mixed clusters of IPP printers and CUPS queues,
> no PPD download from remote CUPS servers (working towards full removal
> of the PPD concept in CUPS) and generally equal treatment of remote
> CUPS queues and native IPP printers.
>
>
> Avahi
> -----
>
> Not continued yet by Trent as he has still urgent work to do.
>
>
> OpenPrinting web site
> ---------------------
>
> No further news.
>
>
> system-config-printer
> ---------------------
>
> Moved upstream hosting from Zdenek Dohnal’s (system-config-printer’s
> current upstream maintainer, works at Red Hat) private GitHub to the
> GitHub of OpenPrinting, but Zdenek continues as upstream maintainer.
>
>
> CUPS
> ----
>
> 2.3.0 released.
>
> So we made it to the new series now. The state of the art of Apple's
> licensing has still to be determined.
>
> Changes in CUPS v2.3.0
> ----------------------
>
> - Fixed a bug in the scheduler job cleanup code (Issue #5588)
> - Fixed an issue with `EXPECT !name WITH-VALUE ...` tests.
> - Fixed a command ordering issue in the Zebra ZPL driver.
>
>
> Changes in CUPS v2.3rc1
> -----------------------
>
> - The `cups-config` script no longer adds extra libraries when linking
>   against shared libraries (Issue #5261)
> - The supplied example print documents have been optimized for size
>   (Issue #5529)
> - The `cupsctl` command now prevents setting "cups-files.conf"
>   directives (Issue #5530)
> - The "forbidden" message in the web interface is now explained (Issue
>   #5547)
> - The footer in the web interface covered some content on small displays
>   (Issue #5574)
> - The libusb-based USB backend now enforces read limits, improving print
>   speed in many cases (Issue #5583)
> - The `ippeveprinter` command now looks for print commands in the
>   "command" subdirectory.
> - The `ipptool` command now supports `$date-current` and `$date-start`
>   variables to insert the current and starting date and time values, as
>   well as ISO-8601 relative time values such as "PT30S" for 30 seconds
>   in the future.
>
> 2.22.12 released.
>
> CUPS 2.2.12 is a bug fix release backporting important fixes from the
> 2.3.x series.
>
> Changes in CUPS v2.2.12
> -----------------------
>
> - The `cupsctl` command now prevents setting "cups-files.conf"
>   directives (Issue #5530)
> - Updated the systemd service file for cupsd (Issue #5551)
> - The `cupsCheckDestSupported` function did not check octetString values
>   correctly (Issue #5557)
> - The scheduler did not encode octetString values like "job-password"
>   correctly for the print filters (Issue #5558)
> - Restored minimal support for the `Emulators` keyword in PPD files to
>   allow old Samsung printer drivers to continue to work (Issue #5562)
> - Timed out job submission now yields an error (Issue #5570)
> - The footer in the web interface covered some content on small displays
>   (Issue #5574)
> - The libusb-based USB backend now enforces read limits, improving print
>   speed in many cases (Issue #5583)
> - Fixed some compatibility issues with old releases of CUPS (Issue
>   #5587)
> - Fixed a bug in the scheduler job cleanup code (Issue #5588)
> - Fixed a command ordering issue in the Zebra ZPL driver.
>
>
> cups-filters
> ------------
>
> Currently released is 1.24.0.
>
> 1.22.6:
>
> Bug fix release, to address a further issue of cups-browsed removing
> user-created print queues, to make grayscale/monochrome PostScript
> jobs of colored input file actually output grayscale/monochrome files,
> to fix several bugs when using MuPDF as PDF renderer, and to silence
> compiler warnings.
>
> 1.23.0:
>
> This release adds support for the "print-scaling" IPP attribute and
> has the code for the support of MuPDF as PDF renderer vastly simplified.
>
> 1.24.0:
>
> Integration of Deepak Patankar's Google Summer of Code 2018 project
> with the main goal of clustering different printers with cups-browsed
> and automatically selecting the destination printers by job content
> and option/attribute settings. To achieve this, several other features
> got added to cups-browsed, especially support for mixed clusters of
> remote CUPS queues and native IPP printers and not downloading PPDs
> from remote CUPS servers any more. All changes of this release are
> done by Deepak as parts of his project.
>
> CHANGES IN V1.24.0
>
>     - cups-browsed: Integration of Deepak Patankar's Google Summer
>       of Code 2018 with the main goal of clustering different
>       printers and automatically selecting the destination
>       printers by job content and option/attribute settings. All
>       changes of this release are done by Deepak as parts of his
>       project.
>     - cups-browsed, implicitclass: Support for mixed clusters of
>       remote CUPS queues and IPP network printers. For this PPD
>       files of remote CUPS queues are generated by cups-browsed
>       based on IPP queries, as for native IPP printers, the number
>       of jobs for load balancing is polled in a way that it works
>       also with native IPP printers, the implicitclass backend
>       sends jobs directky to the printer instead of re-queueing
>       them via CUPS.
>     - cups-browsed: Merge IPP attributes of several printers to
>       combined attributes for the cluster to generate the
>       cluster's PPD file, including PPD constraints for option
>       combinations not fulfillable by any of the member printers,
>       and finding reasonable, non-conflicting default settings,
>     - cups-browsed: Selection algorithm for the destination
>       printer for a job sent to the cluster. Based on the job
>       settings requested such as page size, media type, print
>       quality, ... the best most suitable printer in the cluster
>       for the job will be selected.
>     - cups-browsed, implicitclass: Filter jobs to clusters already
>       locally. Due to the fact that a cluster's member printers
>       are not exclusively non-raw CUPS queues with the complete
>       filtering framework on the remote server, but also native
>       IPP printers, we need to support generic driverless printers
>       as destination. So we cannot pass on the input data
>       unfiltered but need to filter locally. We let the cluster's
>       PPD file emulate a PDF printer, letting the local CUPS queue
>       of the cluster run pdftopdf and any pre-filters to turn the
>       input into PDF and we let the implicitclass backend turn PDF
>       into a format understood by the destination printer,
>       supporting the 4 formats of driverless IPP printing: PDF,
>       PWG Raster, Apple Raster, PCLm.
>
> CHANGES IN V1.23.0
>
>     - pdftops, mupdftoraster: Let pdftops call mutool directly and
>       so that it directly outputs PostScript, eliminating the need
>       to call the mupdftoraster and rastertops filters.
>     - mupdftoraster: Reduced the use of temporary files from 3 to
>       just one.
>     - imagetopdf, imagetoraster, pdftopdf: Add support for
>       print-scaling option (Issue #108, Pull request #118).
>
> CHANGES IN V1.22.6
>
>     - rastertops: Fixed PageSize settings in the PostScript output
>       (Must be in points not in pixels).
>     - pdftops, mupdftoraster: Produce actual grayscale/monochrome
>       PostScript (and not only instructions to print grayscale/
>       monochrome) for jobs to be printed in grayscale/monochrome
>       (Issue #96, Pull request #115).
>     - mupdftoraster: Fixed filter not producing output at all.
>     - Build system: ENABLE_DRIVERLESS got only defined with CUPS
>       1.6 and newer, not with older CUPS versions (Issue #111).
>     - pdftopdf, imagetopdf, imagetoraster: Silenced compiler
>           warnings.
>     - cups-browsed, driverless: Replaced httpConnect() calls by
>       httpConnect2() calls as the former CUPS library function is
>       deprecated.
>     - Build system: Compile everything using the CUPS libraries
>       with '-D_PPD_DEPRECATED=""' for the time being until the
>       deprecated PPD API calls get replaced, to stop the flooding
>       with PPD API deprecation warnings making more important
>       warnings being overlooked.
>     - cups-browsed: When removing a local queue on shutdown or
>       when DNS-SD reports the printer as disappeared check whether
>       the local queue got overwritten by an external process as
>       sometimes the shutdown or disappearing event comes too close
>       for cups-browsed receiving a printer-modified notification
>       from CUPS before (Ubuntu bug #1731417).
>
>
> ippusbxd
> --------
>
> No further news.
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-- 
Zdenek Dohnal
Software Engineer
Red Hat Czech - Brno TPB-C

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