libcupsfilters 2.0rc1

[tillkamppeter]

Release Candidate: DNS-SD URI API prepared for libcups3, fixed control of page orientation, printing text in landscape, image scaling attributes

• Make orientation-requested work correctly In the filter functions cfFilterImageToRaster(), cfFilterImageToPDF(), cfFilterTextToPDF(), and cfFilterPDFToPDF() supplying the attributes orientation-requested or (no)landscape do the expected, rotating content 0/90/180/270 degrees.
• Auto-rotation is always done in the printer's default direction, +90 or -90 degrees as described by the landscape-orientation-requested-preferred IPP attribute or by the "*LandscapeOrientation: ..." PPD keyword (via libppd).
• The ppi attribute works correctly now,no cropping and using more than one sheet if the image gets too large.
• If ore than one image-scaling-related attribute is supplied, only the one with the highest priority is used, no mixing with unexpected results.
• Default is always print-scaling=auto.
• cfFilterTextToPDF() is now capable of printing text in landscape layout, controlled by the orientation-requested and landscape attributes.
• The prettyprint attribute of the cfFilterTextToPDF() now uses wider margins for binding/stitching/punching as originally designed. If the printer has even wider margins this is taken into account.
• cfFilterImageToRaster(), cfFilterImageToPDF(), cfFilterTextToPDF(), and cfFilterPDFToPDF() all work now correctly also with no printer attributes/capabilities supplied at all, and also with and without supplying a page size. With PDF input the input page sizes are used if applicable. As last mean we resort to US Letter page size (Issue Printing an image to a Postscript printer generates empty sheet #26).
• The cfFilterUniversal() filter function now considers the output of cfFilterImageToPDF() correctly as application/vnd.cups-pdf and not as application/pdf, avoiding duplicate application of margins or rotation.
• cfFilterImageToRaster() now produces 16-bit-per-color output if requested by the job/printer, and does not output a blank page any more (Issue imagetoraster and 16bit images #25, pull request Update imagetoraster.c #22).
• On 1-bit dithered output white got a grid of dots
  An off-by-one bug in cfOneBitLine() made white areas appear with a grid of black dots (1 per 16x16 square). This corrected now (Issue pwgtoraster has small black dots. #20).
• DNS-SD device URI resolution: Cleaned API for upcoming libcups3 support.
  For resolving DNS-SD-service-name-based device URIs for IPP printers as CUPS uses them, libcups2 does not offer any useful API and we therefore ended up implementing 2 workarounds. As libcups3 has an API function for it we have adapted our API for its use (libcups3 support will get actually added in version 2.1.0).
• Cleaned up the image scaling and rotation code in cfFilterImage...(), removing duplicate code and doing some simplification.
• cfFilterImageToPDF() could crash when an image could not get loaded and print-scaling was set to fill or none, as a part of the image processing was not covered by the NULL check.
• cfFilterUniversal(): Added NULL checks for parameters, so that the function can get called without parameters.
• Added -std=c++17 C++ compiler flag (Pull request Added C++17 flag #18)
  Needed to build libcupsfilters with QPDF 11.
• Removed unneeded #include entries for libcups

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This discussion was created from the release libcupsfilters 2.0rc1.