[cups-devel] [UNKN] STR #4428: Add IPP attributes required by IPP Everywhere for PWG Raster when PWG Raster as input format is supported

[Till Kamppeter]

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[STR New]

The specs for IPP Everywhere (section 5.3 "IPP Printer Description
Attributes", page 37) require the following printer IPP attributes to tell
clients which types of PWG Raster input files are supported by this
printer:

pwg-raster-document-resolution-supported
pwg-raster-document-sheet-back
pwg-raster-document-type-supported

With the attached patch I add these attributes (only if PWG Raster is
available as input format, for example with cups-filters 1.0.54 which
introduces the rastertopdf filter), so that a print queue shared by a CUPS
server completely emulates an IPP Everywhere printer and for example mobile
devices or appliances (like digital cameras) supporting IPP Everywhere
printers via PWG Raster can print on the shared CUPS queue.

The patch checks at first if PWG Raster is one of the input formats and add
the attributes only then. For pwg-raster-document-resolution-supported it
copies the arguments of "printer-resolution-supported", for
pwg-raster-document-sheet-back it always takes "normal" (the actual sheet
back handling is done on the CUPS server) and for
pwg-raster-document-type-supported it takes the following:

         "adobergb-8"
         "adobergb-16"
         "black-1"
         "black-8"
         "black-16"
         "cmyk-8"
         "cmyk-16"
         "rgb-8"
         "rgb-16"
         "sgray-1"
         "sgray-8"
         "sgray-16"
         "srgb-8"
         "srgb-16"

These are the formats the rastertopdf filter of cups-filters currently is
able to convert.

I have simply made a patch which works, feel free to put it at a different
place in the scheduler code or modify it.

Link: https://www.cups.org/str.php?L4428
Version: 1.7-current
Attachment: https://www.cups.org/strfiles.php/3332/pwg-raster-attributes.patch
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