fc0ea0a4a5
- introduce SkSVGTextPath and update the text render logic to
instantiate new SkSVGTextContexts in onRenderText() overrides
instead of renderText() root -- this is to observe spec semantics
[1] requiring <text> and <textPath> to always start a new chunk,
regardless of their relative nesting.
- expand SkSVGTextContext to also store PathData when used in the
scope of a textPath
- PathData caches SkContourMeasures, for path position lookup
- update flushChunk() to apply path glyph adjustments [2]:
* the horizontal glyph position (including relative offset dx),
adjusted for the glyph center yields a path offset
* if the offset is outside the path range, the glyph is skipped
* otherwise the position is determined based on the path matrix
at the computed offset
- to support the logic above, the chunk starting position is no
longer used as a global blob offset but instead is folded into
individual glyph RSXforms (and the blob always draws at {0,0})
[1] https://www.w3.org/TR/SVG11/text.html#TextLayout
[2] https://www.w3.org/TR/SVG11/text.html#TextpathLayoutRules
Bug: skia:10840
Change-Id: I462eada7c086646afdc1bc84f08ec2368613f1c0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/349397
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Tyler Denniston <tdenniston@google.com>
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| Text.cpp | ||