[svg] Absolute positioning support for text
Implement per-character position attribute lookup based on [1]:
- convert "x" and "y" attributes to arrays
- introduce ScopedPosResolver to handle positioning attribute lookup
and fallback
- push a new resolver every time we enter a text positioning element
scope (<text>, <tspan>, etc).
- flush/reposition a new text chunk every time we encounter explicit
absolute positions
The position attribute fallback logic is complex enough to warrant a
unit test.
[1] https://www.w3.org/TR/SVG11/text.html#TSpanElementXAttribute
Bug: skia:10840
Change-Id: I66c478fea4a179fdb8b1a6a9ff00c4dd9509f8d2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/345161
Commit-Queue: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Tyler Denniston <tdenniston@google.com>
6 files changed