[cairo-bugs] [Bug 10301] New: LCD filtering patch

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Mar 15 02:29:24 PDT 2007


           Summary: LCD filtering patch
           Product: cairo
           Version: 1.4.0
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: licence, patch
          Severity: normal
          Priority: medium
         Component: freetype font backend
        AssignedTo: freedesktop at behdad.org
        ReportedBy: sbrabec at suse.cz
         QAContact: cairo-bugs at cairographics.org

Here is a patch for LCD filtering from SuSE builds.

The patch is from David Turner, one of the freetype2 upstream developers.

David Turner says: "...my final understanding is that the MS patents pretty
cover *all* cases of LCD-specific rendering we're interested in (there are
ClearType patents that clearly don't affect us). And by the way, this includes
the original LCD-specific code found in libXft, Cairo, and probably the XRender
implementation of your X11 Server, even without my FIR-filter patch."

David Turners mails concerning the LCD filtering and the Cairo patch
are all on a public mailing list and they explain the problem
in detail:


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