Recording mask clips in the clip stack changes the value of TopmostClipId()
which confuses the code in ScrollingLayersHelper. The mask clip can be
thought of as an "out-of-band" clip that ScrollingLayersHelper doesn't
need to know about. This patch adds a mechanism for pushing such
"out-of-band" clips without touching the clip stack.
MozReview-Commit-ID: 8Zeqtigk0cj
--HG--
extra : rebase_source : 35176f3c9d98d186f78d7a0ff44845c7c3c9f67e
This replaces our DrawTargetCapture hack with a similar but more powerful TextDrawTarget
hack. The old design had several limitations:
* It couldn't handle shadows
* It couldn't handle selections
* It couldn't handle font/color changes in a single text-run
* It couldn't handle decorations (underline, overline, line-through)
Mostly this was a consequence of the fact that it only modified the start and end
of the rendering algorithm, and therefore couldn't distinguish draw calls for different
parts of the text.
This new design is based on a similar principle as DrawTargetCapture, but also passes
down the TextDrawTarget in the drawing arguments, so that the drawing algorithm can
notify us of changes in phase (e.g. "now we're doing underlines"). This also lets us
directly pass data to TextDrawTarget when possible (as is done for shadows and selections).
In doing this, I also improved the logic copied from ContainsOnlyColoredGlyphs to handle
changes in font/color mid-text-run (which can happen because of font fallback).
The end result is:
* We handle all shadows natively
* We handle all selections natively
* We handle all decorations natively
* We handle font/color changes in a single text-run
* Although we still hackily intercept draw calls
* But we don't need to buffer commands, reducing total memcopies
In addition, this change integrates webrender's PushTextShadow and PushLine APIs,
which were designed for this use case. This is only done in the layerless path;
WebrenderTextLayer continues to be semantically limited, as we aren't actively
maintaining non-layers-free webrender anymore.
This also doesn't modify TextLayers, to minimize churn. In theory they can be
augmented to support the richer semantics that TextDrawTarget has, but there's
little motivation since the API is largely unused with this change.
MozReview-Commit-ID: 4IjTsSW335h
--HG--
extra : rebase_source : d69f69648ade5c7a8e6bb756f4b8ab9e2543e576
For layers-free mode, we still need to call NotifyInvalidation to trigger
FireDOMPaintEvent. It should be fine to pass an empty rect since we always
take full snapshot for WR.
MozReview-Commit-ID: EzzQi2C5aRQ
--HG--
extra : rebase_source : 81eb63698bd052615c42eebb392e7f771a59f36c
A basic sanity check here seems to produce the correct behaviour but I'm
not at all confident that this will always do the correct thing in more
complex cases or when perspectives are involved. However this is hard to
test and get working without the testing infrastructure up and running
so I'd rather land this simple code first and then dig into the more
complex cases once we have a way to catch regressions.
MozReview-Commit-ID: E4HytiZowEn
--HG--
extra : rebase_source : c7466092298aebf66926e8e0bdf58eb4651f0f19
This was spot-tested by taking the
layout/reftests/border-radius-clipping-1.html testcase, removing the
border, and fiddling with the border-radius values. Without this patch,
the div always appears with rectangular corners but with this patch the
border-radius value is respected correctly.
MozReview-Commit-ID: 1wBFnJnYCwC
--HG--
extra : rebase_source : 542f814af9369fe712af76fc2a8c78de26c6227f
This was spot-tested by taking the
layout/reftests/border-radius-clipping-1.html testcase, removing the
border, and fiddling with the border-radius values. Without this patch,
the div always appears with rectangular corners but with this patch the
border-radius value is respected correctly.
MozReview-Commit-ID: Cu1K3rLjm0V
--HG--
extra : rebase_source : b5994faceb9dd7e52222714bdbc5b06886d26415
Kartikaya Gupta
Phil Ringnalda
Brad Werth
Ethan Lin
Wes Kocher
Sebastian Hengst
Bas Schouten
Matt Woodrow
Alexis Beingessner
Carsten "Tomcat" Book
Jonathan Watt
Morris Tseng
Markus Stange
sotaro
Ehsan Akhgari
Tooru Fujisawa