For layers-full mode, we set the backface-visibility to visible because
visibility would be handled by FLB and layers.
MozReview-Commit-ID: CUbeUabfC7K
Currently if SourceSurfaceVolatileData::Map fails due to being purged,
we expect that the surface will be discarded by the caller. This has not
consistently been the case, and as such, we should ensure we do not
forget if a buffer was previously purged when we reacquire it. Since we
do not at this time support repopulating an already allocated buffer
with new data, we cannot reset this state once it has been set.
Currently if SourceSurfaceVolatileData::Map fails due to being purged,
we expect that the surface will be discarded by the caller. This has not
consistently been the case, and as such, we should ensure we do not
forget if a buffer was previously purged when we reacquire it. Since we
do not at this time support repopulating an already allocated buffer
with new data, we cannot reset this state once it has been set.
* The -Wno-unused-but-set-variable flag is supported by gcc but not clang, so move it to a gcc-only CFLAGS.
* The -Wno-error=uninitialized flag is supported by both gcc and clang, so move it to CFLAGS shared by gcc and clang.
* Also suppress -Wunreachable-code and -Wshift-negative-value clang warnings. gcc supports -Wshift-negative-value, but only starting in gcc 6.1 and we are still using gcc 4.9 in automation.
warning: unknown warning option '-Wno-unused-but-set-variable'; did you mean '-Wno-unused-const-variable'? [-Wunknown-warning-option]
gfx/cairo/cairo/src/cairo-quartz-surface.c:1908:6: warning: code will never be executed [-Wunreachable-code]
gfx/cairo/libpixman/src/pixman-bits-image.c:268:32: warning: shifting a negative signed value is undefined [-Wshift-negative-value]
MozReview-Commit-ID: AnQAsfDaZbk
--HG--
extra : rebase_source : 6dd94a39479e05f67f93d4e4be2bd10ece4df7be
extra : source : 34ddaea5129be2ae1e9faa0a1d905b8690909611
DEFFILE is currently just used as a passthrough variable. All but one of
the current uses of it use `SRCDIR + '/file.def'` to get a srcdir-relative
path anyway, and the other one wants an objdir-relative path, so using
Path makes everything clearer.
This makes it more straightforward to translate the paths for the WSL
build.
MozReview-Commit-ID: IRokABaZW2c
--HG--
extra : rebase_source : ae74c984bb2aab70211dc5974a8b052651e025dd
There have been reports of images remaining in the surface cache but no
longer containing the previously decoded data. Instead these appear as
transparent (BGRA) or black (BGRX). This suggests that somehow the image
surface buffer was reset to all zeroes. Additionally this seems to be
correlated with suspend and resume.
One possibility is that the OS purged our volatile buffers on suspend.
This is because we are supposed to be able to regenerate the contents
anyways, so it could choose to not preserve the data on suspend. In
general we should recover from this however and clearly we are not.
This patch adds a diagnostic assert to ensure that a buffer which was
previously purged is not reused later, as we should be discarding said
buffers.
