On 2/10/14 12:41 PM, Robert O'Callahan wrote:
What exactly do you mean by "font collection loading"? If you ask the right questions I can explain how it works in Gecko :-).
Sure thing. Sorry for the delay here, I needed to profile and re-familiarize myself with Servo's code :)
I'm on a Mac, so I'll describe it in terms of those APIs. The hot font-related functions in Wikipedia flow construction are as follows:
* `CTFontGetBoundingBox` - called during frame construction for text boxes when we hit a font we haven't seen yet. I think this is for vertical align.
* `CTFontGetAdvancesForGlyphs`/`CTFontGetGlyphsForCharacters` - core shaping functions, called during text run construction, part of frame construction, as part of a HarfBuzz callback.
* `CTFontCollectionCreateMatchingFontDescriptors` - constructs the query used to ask the OS which fonts are available. This is ultimately called from Servo `FontContext::get_resolved_font_for_style()`, called during frame construction for text boxes.
* `CTFontManagerCopyAvailableFamilyNames` - gets the list of available families from the OS. Called when we create the thread-local font context. (There is one font context per frame construction thread.)
So I guess my question is: Where does Gecko call the analogues to these functions?
Patrick _______________________________________________ dev-servo mailing list dev-servo@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-servo
