[skottie] Initial text box support
AE supports two text layout modes [1]:
* point text: text is laid out on an infinite line, starting at the given position,
and observing explicit line breaks only; in this case the text baseline is at the
given position.
* paragraph (box) text: text is laid out within the given box, using line breaks to
fit.
This CL implements the latter mode, in addition to the already supported point mode:
- parse & plumb the text box info
- update the text adapter logic to use SkShaper's width-constrained shaping mode
- tangentially, fix sksg::TextBlob's bounds computation
[1] https://helpx.adobe.com/after-effects/using/creating-editing-text-layers.html
Bug: skia:8849
Change-Id: Ifdb34e39eef84d10fd75870aef785e3ee960a19c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201387
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
4 files changed