With the cairo update in bug 739096, the functions `cairo_tag_begin` and `cairo_tag_end` become available, which can be used (with the "Link" tag type) to generate links in PDF output.
There are two ways to use this. One approach is to issue `cairo_tag_begin` with an associated URL, then do some drawing, and then do `cairo_tag_end`; the PDF backend will collect the bounding rect of whatever gets drawn in between the begin/end pair, and generate a link for this area. The alternative is to explicitly pass a rect (or list of rects) to `cairo_tag_begin`, rather than relying on the backend to collect the affected area. I've experimented with both options, and it seems to me that we get a better result by explicitly passing the frame rect of whatever frame(s) are associated with the link, rather than depending on cairo's accumulation of the area between begin and end. This results in clickable PDF links that better match the clickable areas of the HTML document as viewed in the browser. (Which makes sense, as the active area of an HTML link is determined by the frame's area, not by the actual rendered ink.) Currently, only the PDF backend supports generating links like this. On macOS, our Save as PDF functionality actually goes via the cairo-quartz backend and the macOS printing architecture, rather than cairo's PDF backend. So to support links there, we'll need to add support for tag begin/end to the quartz surface. Fortunately, we don't currently need to implement everything that the PDF backend provides; just supporting tag_begin with the Link type and an explicit rect will provide enough functionality here. (Eventually, it would be awesome to implement more Tagged PDF support -- e.g. to tag document structure, internal destinations, etc -- but that's for another day, another bug.) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1551949 Title: Printing to PDF file loses URLs/links Status in Mozilla Thunderbird: In Progress Status in thunderbird package in Ubuntu: Confirmed Bug description: Steps to reproduce: 1. File -> Print... 2. Select "Print to File". 3. Enter the file name. 4. Enter the save-to folder. 5. Leave the output format as-is, or select PDF if it's not the default. 6. Hit the Print button. 7. Open the resulting PDF in any PDF viewer. Actual results: The URLs within the document are not actually hyperlinks. They are simply text, coloured blue and underlined. Expected results: Any clickable links on the original e-mail message should be retained when converting the document to PDF format. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: thunderbird 1:38.5.1+build2-0ubuntu0.15.10.1 ProcVersionSignature: Ubuntu 4.2.0-30.35-generic 4.2.8-ckt3 Uname: Linux 4.2.0-30-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: colan 2383 F.... pulseaudio /dev/snd/controlC0: colan 2383 F.... pulseaudio BuildID: 20160106101030 Channel: Unavailable CurrentDesktop: Unity Date: Tue Mar 1 15:53:53 2016 EcryptfsInUse: Yes ExecutablePath: /usr/lib/thunderbird/thunderbird Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) IpRoute: default via 192.168.1.1 dev wlan0 proto static metric 600 169.254.0.0/16 dev wlan0 scope link metric 1000 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.140 metric 600 Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-1abc004a-043e-4a15-bdc0-45ade2150908 Plugins: Google Talk Plugin Video Renderer - /opt/google/talkplugin/libnpo1d.so (google-talkplugin) Google Talk Plugin - /opt/google/talkplugin/libnpgoogletalk.so (google-talkplugin) iTunes Application Detector - /usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so (rhythmbox-mozilla) Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin) ProcEnviron: LANGUAGE=en_CA:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_CA.UTF-8 SHELL=/bin/zsh Profiles: Profile0 (Default) - LastVersion=38.5.1/20160106101030 (In use) RelatedPackageVersions: google-talkplugin 5.41.0.0-1 rhythmbox-mozilla 3.2.1-1ubuntu3.1 adobe-flashplugin 1:20160209.1-0ubuntu0.15.10.1 RunningIncompatibleAddons: False SourcePackage: thunderbird SubmittedCrashIDs: bp-1abc004a-043e-4a15-bdc0-45ade2150908 bp-c8c94f9f-0c39-42d2-97ac-f2c7d2150713 Themes: extensions.sqlite corrupt or missing UpgradeStatus: Upgraded to wily on 2015-11-30 (92 days ago) dmi.bios.date: 07/09/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 4.6.5 dmi.board.asset.tag: Tag 12345 dmi.board.name: Galago UltraPro dmi.board.vendor: System76, Inc. dmi.board.version: galu1 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: System76, Inc, dmi.chassis.version: galu1 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd07/09/2013:svnSystem76,Inc.:pnGalagoUltraPro:pvrgalu1:rvnSystem76,Inc.:rnGalagoUltraPro:rvrgalu1:cvnSystem76,Inc,:ct9:cvrgalu1: dmi.product.name: Galago UltraPro dmi.product.version: galu1 dmi.sys.vendor: System76, Inc. 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