Re: [Patch] Printing of HTML message parts

Hi Albrecht:

On 02/07/2019 03:14:28 PM Thu, Albrecht Dreß wrote:
> Hi all,
> 
> printing of HTML message parts is a feature missing in Balsa, and some users complained about it.  The problem is that Webkit supports printing, but not “embedded” into the email structure.  As a workaround, Balsa supports printing the html part /only/ (right-click on the html view), but this lacks the headers and other parts in the result.
> 
> Attached is a proposal for solving the issue.  The basic idea is to let Webkit render the HTML content into a Cairo (image, pixel) surface, and then print the surface pretty much like an image, if necessary split over multiple pages.
> 
> The patch uses a resolution of approximately 200 dpi (as it is not easy to control the output width Webkit uses when rendering to an offline window) and a zoom factor of 2 which for me gives a “usable” output.  It is not vector graphics, so the quality is somewhat limited, but IMHO should be sufficient.  Maybe we should make the dpi and zoom factor setting configurable.
> 
> An other problem may occur when longer HTML parts are distributed over multiple pages: a line of text may be split into two halves, as the splitter of course has no idea about the content.  A solution might be adding a little overlap (maybe 2-3mm), i.e. if the last line one one page is intersected, if will (hopefully) be complete on top of the next page.
> 
> The print dialogue has two new options: whether text/plain shall be preferred over text/html or not, and whether external images shall be loaded for printing.  Note that these two options are “volatile” – the former is initialised from the same display option, and the latter is always off as default for privacy reasons.  Related to this, I took the opportunity to clean printing multipart/alternative parts by printing only the selected version.
> 
> As always, any comment is welcome!
> 
> Cheers,
> Albrecht.

Thanks for the patch! Great to add the missing functionality--works well for me.

Best,

Peter

_______________________________________________
balsa-list mailing list
[email protected]
https://mail.gnome.org/mailman/listinfo/balsa-list

-----BEGIN PGP SIGNATURE-----

iF0EABECAB0WIQS030wPRfNNA5alz3MfX9S1uSp09QUCXGdCtgAKCRAfX9S1uSp0
9YBTAJ0TcoRcgF6ELgpkaMI1qomeGBI5hACbBWlcfkPM538xeXy+5tomcQFrzdw=
=XEAN
-----END PGP SIGNATURE-----