This patch implements a derived class of gfxPlatformFontList and a set of associated objects that uses fontconfig. It's a replacement for the existing gfxPangoFontGroup and gfxFontconfigUtils code. The fontconfig API is used to lookup all fonts on the system, which are grouped by family name.
Changes due to this patch:
- font style matching, the mapping of style attributes to a specific font, is now handled by the same Gecko code that is used on other plaforms. fontconfig substitutions are handled but fontconfig style matching no longer used.
- downloadable fonts using unicode-range are now supported
- local fullname lookups are only done with the English name of the font, as per the CSS3 Fonts spec, and not only other localized fullnames
- size-specific bitmap fonts are no longer supported
- fonts lacking a Unicode character map are no longer supported
AccessibleCaret should behave like TouchCaret and SelectionCarets. I
refactor the setUp() to support both the old and new preferences.
Rename test_selectioncarets_multiplerange.py to test_selectioncarets2.py
since it now contains more than just multirange tests.
_test_handle_tilt_when_carets_overlap_to_each_other() is modified
because AccessibleCaret does not inflate the caret hit rectangle as
TouchCaret/SelectionCarets did. The point for tilt caret edges need to
shrink a bit.
In test_touchcaret.py, instead of setting _large_expiration_time, I just
disable caret timeout by default for every test. For those timeout
tests, use one second timeout to reduce test running time, and allow
1.5x margin to prevent intermittent failures.
Refine test case that move touch caret to front by using the real
position at the front rather than (0, 0).
Use skip_if_not_rotatable decorator for better log message.
The necessary modifications are the same as SelectionCarets. For
convenience, Touch/SelectionCarets will be disabled whenever
AccessibleCaret preference is enabled.
See AccessibleCaretEventHub.h for the class description.
Both TouchCaret and SelectionCarets have their event handling mechanism,
which lead to a lot of code duplication. Now AccessibleCaretEventHub
serves as the single entry point for all events and callbacks.
We also encountered performance issues in SelectionCarets because many
unnecessary events might be dispatched to Gaia driven by the selection
changed events. SelectionCarets did not have clear internal states to
avoid this. To solve it, AccessibleCaretEventHub implements state
classes, and rely on the current states to call the CopyPasteManager's
handler only when it's needed.
For example, when dragging a caret, we do not interest in
NotifySelectionChanged() for updating the carets. Since we've known a
caret is being dragging, we can call UpdateCarets() directly. Hence
DragCaretState does not override OnSelectionChanged().
