877073 - generate a display item for each TextRenderedRun of an nsSVGTextFrame2

Status: NEW

(Core :: SVG, defect)

Description

[Cameron McCormack (:heycam)]

Currently we create a single nsDisplaySVGText item that just calls nsSVGTextFrame2::PaintSVG.  We could instead have nsSVGTextFrame2::BuildDisplayList iterate over the TextRenderedRuns and generate a display item for each one.  That should result in smaller invalidation areas when for example changing a single tspan's style.

Comment 1

[Cameron McCormack (:heycam)]

Attachment: test

For example if you load this and turn paint flashing on, you can see the whole rectangle that covers both tspans is invalidated, when layout.svg.css-frames.enabled = true.  With the old text code, at least the two individual rectangles are invalidated.  But we should be able to do better than both of these.