* commit '56c7fb8c':
  Allocate font vector on stack

This reduces another allocation (last one?) we were doing when
fulfilling shaping requests from the cache.

Bug: 17111260
Change-Id: Ieb8ae1ccfcaacedb257e1e9263777f10623aaf98

* commit '6da7796c':
  Fix Layout initialization in the skipCache path

C++ local var initialization always tricks me.  Previously, Layout
didn't have a constructor, which meant that defining it on the stack
left mAdvance uninitialized.  This was not an issue when we were doing
"new Layout()", since that invokes zero-initialization, but was an
issue for the skipCache path that was allocating layout on stack by
just "Layout l" instead of "Layout l = Layout()".  To avoid surprises,
add a constructors that clears everything.

Also adds reset() method to reset the layout for reuse.

Change-Id: I3e02f00da9dd7d360abe13f63c310f6882292d0a

* commit '288c9159':
  Speed up cache lookup

Avoid copying the string for cache lookup.

Bug: 17111260
Change-Id: Ic220bfc991fc6b3dada197304aabdf72a8941bd7

* commit 'f952161b':
  Choose same font for Emoji keycap and its base character

The U+20E3 COMBINING KEYCAP is used in our fonts to generate an emoji
rendering of ASCII numbers and letters through GSUB.  For that to work
we need to choose the same (Emoji) font for the character coming
*before* the COMBINING KEYCAP character.

This is a special-case of a broader need to choose fonts per grapheme
cluster as opposed to per character, but for now, special-case U+20E3.

Bug: 7557244
Change-Id: I958e5a01068df8495bbb9bc3b9ed871cea1838b6

* commit '5986f604':
  Support fontFeatureSettings

Bug: 15246510
Change-Id: I544915d29b2be4fb9f82f1989188a3a918c50fbc

* commit '9802b0dc':
  Fix examples build

* commit 'd50c99df':
  Remove CSS string doLayout entrypoint and supporting code

* commit '83d5a3c5':
  Initialize MinikinPaint members

Was broken after recent CSS removal.

Change-Id: I160fbc73286b21336d6f3943ff92d7d150dff74b

We are stack-allocating MinikinPaint objects in Minikin clients, and
without a constructor adding new members to the struct cannot be done
without updating all clients (only one right now!).

Change-Id: I4170f16498bb6b07cb795495011aca58087ed0bd

New API removes CSS string and directly takes needed objects.

Bug: 16651112
Change-Id: Ie5f7c2ab05be6cbd77cae0a5fd6bb453771ada59

All usage is ported to the new doLayout() API now.

Bug: 16651112
Change-Id: I2c959138a69853b5e30098889d771fe5f4cfaa66

Replaces invalid unicode with replacement character U+FFFD and always
makes forward progress.

Bug: 15849380

Change-Id: Ic59ef6c64b0f5c4450bcae61597adcc269d6e7c5

Extract language from FontStyle during shaping.  Don't attach CSS
to LayoutContext.

Change-Id: Ie621d3415410178d0d15fa7b810eb8e412342ab6

It has been unused outside minikin.

Change-Id: Iaa2237767d81c77f90d0264e633375e601dd72f1

After update to HarfBuzz 0.9.33 we don't need this anymore.  HarfBuzz takes care of invalid input and passes U+FFFD to us.

This reverts commit 4422f4dd.

Change-Id: Icfd0dc836a8d684fb1723fc215aa01f99639ff59

Bug: 15594400
Change-Id: Ied94d7674be4097b0f44c9b0770d3294dc6433c1

Bug: 15849380
Change-Id: Ib5285e57c5806bd399600fadd56e8bc809da323f

Change-Id: I50a112739847fa826088854f6d172a188ff4cfb3

Change-Id: I29a59edfe6102257c9f308aac1b4348ef7a18db7

When a run has no cmap coverage in any font, use the base font. Most of
the time, this will cause rendering of the .notdef glyph, which is
preferable to displaying nothing. In some cases, Harfbuzz may be able to
decompose the characters (not in the cmap) to ones that are, in which
case we'll render those, as long as they're in the base font.

Bug: 6629748
Bug: 15816880
Change-Id: Ibb1b9242c83626e0c7db363ad65ce44a967a005e

Change-Id: Iffad3ef724b565d5d8fed17722630fd74cda9234

Proper Japanese layout requires sophisticated rules for spacing
punctuation, not just turning on the "palt" (proportional alternate)
feature. Until we can support the whole set, roll back palt.

Change-Id: If2359c529b70b1dd45dddc00e5f4aa1c91f8b0e9

Expose a method to purge caches used for TextLayout, useful for low
memory conditions.

Change-Id: I92f41afe987b7be4af5ca0a0c50fb51be35a2758

This patch includes an implementation of grapheme cluster breaking,
which is especially useful for repositioning the cursor for left and
right arrow key presses. The implementation is closely based on Unicode
TR29, and uses the ICU grapheme cluster break property, but is tailored
to more closely match the existing implementation and expected behavior.

Part of a fix for b/15653110 Improve behavior of arrow keys in EditText

Change-Id: I8eb742f77039c9ab7b2838285018cf8a8fc88343

Fixes b/15734816 In the text "Wi-Fi", "-Fi" appears bolder than "Wi"

The problem was caused by "stickiness" in choosing fonts, where layout
would prefer using a font used for preceding characters as long as it
mapped the following characters in a run, in favor of the "best match"
rules. This patch adds a whitelist for making the stickiness more
conservative, only applying it for characters necessary for correct
shaping (ZWJ and ZWNJ in particular) and basic punctuation, where it is
desirable to match the style of the preceding text.

Change-Id: I1cf116879f074a5a71c351846707bfdd07b0d320

* commit 'e68467e9':
  Tighten requirements for fake bold

* commit '15651697':
  Support for fake bold and italics

* commit 'b1eae5ea':
  Add baseFont method to FontCollection

The simple predicate for fake bold (2 or more grades darker than
requested) was applying it to thin (100 weight) when normal was
requested. This patch tightens the predicate to also require that
the requested weight be in the bold range.

Fix for bug 15588352 "sans-serif-thin doesn't work on lockscreen"

Change-Id: Id9988bd149a9c8a7c943e3b221f7fb4b37fb6ddb
(cherry picked from commit 9f9f3b1e)