1173221 - use FreeType embolden for synthetic bold under Android

Status: RESOLVED INACTIVE

(Core :: Graphics: Text, task)

Description

[John Daggett (:jtd)]

For synthetic bolding on Android/FFOS we're using the generic synthetic bolding code, which "stamps" the glyph repeatedly to achieve a bold effect:

http://mxr.mozilla.org/mozilla-central/source/gfx/thebes/gfxFT2Fonts.cpp#163

The Linux code uses the FreeType embolden feature to do this automatically at the glyph level. This is far more efficient and produces better results. To achieve this we need to set the CAIRO_FT_OPTIONS_EMBOLDEN option so that cairo calls FT_GlyphSlot_Embolden for each glyph. Guessing this will mean adding a cairo API for setting this explicitly.

http://mxr.mozilla.org/mozilla-central/source/gfx/cairo/cairo/src/cairo-ft-font.c#183
http://mxr.mozilla.org/mozilla-central/source/gfx/cairo/cairo/src/cairo-ft-font.c#2280

Comment 1

[Andrey Bienkowski]

https://bugzilla.mozilla.org/show_bug.cgi?id=1548706

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The bug assignee didn't login in Bugzilla in the last 7 months.
:lsalzman, could you have a look please?
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