Previously, in greedy line breaking, when a line overflowed, we found
the best line breaking candidate before it and broke the line there.
But we didn't check to see if the remaining part now fits in a line.

With this change, we now repeat checking for overflows, and break
again until we have no breaking opportunity or the remaining text now
fits in a line.

Also found an issue with greedy line breaking and keeping the
hyphenation edit for the next line which is now fixed.

Test: Manual. The issue reported in the bug is now fixed.
Bug: 34185255
Bug: https://code.google.com/p/android/issues/detail?id=231437
Bug: 33560754
Change-Id: I93bdd341e4f8e1257710e453e4938f224cb2a1ff

This adds better support for Arabic script languages, Armenian,
Catalan, Hebrew, Kannada, Malayalam, Polish, Tamil, and Telugu by
adding various hyphenation types and edits appropriate for the
locales.

For Arabic script languages, soft hyphens act transparently with
regard to joining: If a line is broken at a soft hyphen where the two
characters around the soft hyphen were joining each other before,
they will continue to appear joining if the line is broken at the
soft hyphen and a hyphen glyph is inserted.  This is needed for
Central Asian languages such as Uighur.

For Armenian, U+058A ARMENIAN HYPHEN is used for line breaks caused
by either automatic hyphenation or soft hyphens.

For Catalan, nonstandard line breaks are implemented for "l·l", which
hyphenates as "l-/l".

For Polish, when there is a line break at a hyphen, the hyphen is
repeated at the next line.

For the South Indic languages, when breaks happen due to soft breaks
or automatic hyphenation, no visible hyphen is inserted, although a
penalty is added.

For Hebrew, support for using U+05BE HEBREW PUNCTUATION MAQAF has
been implemented, but it's turned off pending confirmation of
desirability.

Also, hard hyphens, which previously had no penalty added for
breaking the line after them, now have the same penalty as an
automatic or soft break, with the difference that no hyphen is
inserted when they break.

Finally, some bugs have been fixed with hyphenating multiscript and
multi-font words.

Bug: 19950445
Bug: 19955011
Bug: 25623243
Bug: 26154469
Bug: 26154471
Bug: 33387871
Bug: 33560754
Bug: 33752592
Bug: 33754204
Test: Unit tests added, plus thorough manual testing
Change-Id: Iaccf776ce8d1d434ee8b1c534ff3659d80fdc338

Let's use shared_ptr since manual ref counting can be a bug-prone and
using the global mutex inside destructor is not useful for some time.

To remove raw pointer manipulation, needed to change Layout
constructors. Layout is no longer copyable and need to pass
FontCollection to constructor.

Bug: 28119474
Test: minikin_tests passed
Test: hwui_unit_tests passed
Test: No performance regression in minikin_perftest.
Change-Id: I8824593206ecba74cbc9731e298f045e1ae442a3

Add an "mJustified" for justification, and tune the line breaking to
produce good results. Major differences for fully justified text include:
- Space can be shrunk in justified text.
- Hyphenation should be more aggressive in justified text.

Also adds a penalty for the last line being very short. This is tuned
to be more aggressive for ragged right than for justified text.

This is based on a patch by Raph Levien (raph@google.com).

Bug: 31707212
Test: Manually tested with Icbfab2faa11a6a0b52e6f0a77a9c9b5ef6e191da
Change-Id: If366f82800831ccc247ec07b7bc28ca4c6ae0ed6

Here is a new policy of the namespace of minikin.
- All components should be in minikin namespace.
- All tests are also in minikin namespace and no anonymous namespace.

Bug: 29233740
Change-Id: I71a8a35049bb8d624f7a78797231e90fed1e2b8c

There was the possibility of stale indents from previous invocations
persisting in the mLineWidths across multiple invocations. This patch
clears them.

Bug: 28090810
Change-Id: I3621dfbe983512046289373711709aeade52eab4

Implement a WordBreaker that defines our concept of valid word
boundaries, customizing the ICU behavior. Currently, we suppress line
breaks at soft hyphens (these are handled specially). Also, the
new WordBreaker class has methods that determine the start and end
of the word (punctuation stripped) for the purpose of hyphenation.

This patch, in its current form, doesn't handle email addresses and
URLs specially, but the WordBreaker class is the correct place to do
so. Also, special case handling of hyphens and dashes is still done
in LineBreaker, but all of that should be moved to WordBreaker.

Bug: 20126487
Bug: 20566159
Change-Id: I492cbad963f9b74a2915f010dad46bb91f97b2fe

Tuning for hyphenation parameters. We discourage hyphenation on the
last line, but offset this penalty by also applying a penalty for
each line, which optimizes for minimizing the number of lines. Thus,
when hyphenation can reduce the number of lines, it increases the
chance they're used.

There's probably more tuning and refinement that can be done, but
testing suggests that the tunable parameters are appropriate.

Bug: 20883322

Change-Id: Ida7eaf8aced109e426694f5a386924a842d29c4b

Three hyphenation frequencies are now supported:

kHyphenationFrequency_None, which turns off both automatic
hyphenation and soft hyphens.

kHyphenationFrequency_Normal, which has aconservative amount of
hyphenation useful as a conservative default.

kHyphenationFrequency_Full, which has a typographic-quality amount of
hyphenation useful for running text and tight screens.

Bug: 21038249
Change-Id: I2800f718c887c9389a1a059d7ec07d7fa2ca1dee

The name "margin" conflicts with another meaning, so we're making the
name in the public api "idents" and the code consistent in naming.

Change-Id: I9170116b4d972e4b25f0f319e78376310288eb41

In order to support layout in non-rectangular regions, the LineWidths
object needs to accept an arbitrary array of margins. This is
implemented in addition to the existing firstWidthLineCount/restWidth
mechanism for convenience, though using only arrays would have the
same expressive power.

Bug: 20182243
Change-Id: Iea96bca1a92012314ac27e617c67f306c1f1b2f2

This reverts commit 0b25d5ac.

This reverts commit daf6a6bd.

Change-Id: I3fed65046274d3aeb748f0730585ab89927f5741

This patch adds hyphenation using the Liang hyphenation algorithm,
similar to TeX. It also improves the optimized line breaker so that
it works correctly and efficiently even when the line width is not
constant (there is a specialization for constant width, which is
probably worthwhile, but performance TODOs remain).

Still to be done:

* hyphenator has many shortcuts, only tested with English

* interaction between punctuation and hyphenation is problematic

Change-Id: I2d94a1668ebc536398b7c43fcf486333eeb7c6aa

This patch adds a LineBreaker class to Minikin, which will be used for
computing line breaks in StaticLayout. The version in this patch
contains basically the same functionality that existed before, but
hopefully better performance and an interface that's suitable for more
sophisticated paragraph layout.

Note that this version contains a high quality strategy, which mostly
works but doesn't respect varying line width.

Change-Id: I02485d58b1e52856296a72cdd4efd963bc572933