Bug 25860 – Chromium Linux font fallback should try more fonts

• Component: Platform
• Status: RESOLVED FIXED

[Evan Martin]

Our getLastResortFallbackFont is a stub.

We should fall back on the generic names "Sans", "Serif", etc. if our other fallbacks have failed.  (Note that we intentionally *don't* map CSS names like "sans-serif" via the settings because we want those to remain Arial for compatibility.)

See also
http://code.google.com/p/chromium/issues/detail?id=10665

[Evan Martin]

Created attachment 30456 [details]
fix

 WebCore/ChangeLog                                  |   11 +++++++++
 .../platform/graphics/chromium/FontCacheLinux.cpp  |   24 ++++++++++++++++++-
 2 files changed, 33 insertions(+), 2 deletions(-)

[Evan Martin]

Adding some reviewers for comments.

[Eric Seidel (no email)]

I have no way of knowing if this font fallback behavior is "correct" or not.  Hyatt might know.  This looks different from the Mac code, but maybe is correct for Chromium?

Seems a little silly to fallback to Sans twice.

[Evan Martin]

Yes, in the Mac code it uses this strictly for last resort fallback.  However this behavior more closely matches FontCacheChromiumWin.  I also don't know which is more correct.

Note that I *believe* that keeping "sans-serif" in CSS matching "Arial" in font lookup is desirable.

[Evan Martin]

Oh, and the double-fallback is a bit silly, but the alternatives are all more code.  And a system that doesn't have "Serif" or "Monospace" set up is pretty seriously broken.  One idea is just to remove that last try, because if you don't have those fonts you're unlikely to have Sans anyway.  I'd still want to add a "default:" on the switch then.

[Eric Seidel (no email)]

Comment on attachment 30456 [details]
fix

Hyatt's AWOL, or at least not answering mail.  This ain't gonna hurt anything and seems sane enough for Linux.

[Evan Martin]

Created attachment 30565 [details]
fix

 WebCore/ChangeLog                                  |   11 ++++++++++
 .../platform/graphics/chromium/FontCacheLinux.cpp  |   21 ++++++++++++++++++-
 2 files changed, 30 insertions(+), 2 deletions(-)

[Evan Martin]

Created attachment 30566 [details]
align with switch

 WebCore/ChangeLog                                  |   11 ++++++++++
 .../platform/graphics/chromium/FontCacheLinux.cpp  |   21 ++++++++++++++++++-
 2 files changed, 30 insertions(+), 2 deletions(-)

[Eric Seidel (no email)]

Comment on attachment 30566 [details]
align with switch

Looks great.  Dave could add an ASSERT(fontPlatformData); right before the return.  In that case, where a user's system is totally hosed, we might as well crash early instead of late.

[David Levin]

http://trac.webkit.org/changeset/44015