This patch adds fetchpriority support for `<link rel=preload as=image>`
and equivalent HTTP Link header. The fetchpriority value is passed from
where the link is parsed down to `NewImageChannel` where the priority
is initially set. Currently, the default equals PRIORITY_LOW, but is
decreased a bit if LOAD_BACKGROUND flag is set (this is always the case
for link preload images, see `imgLoader::LoadImage`). Later, the
priority can be increased again depending on the category (see
`imgRequest::BoostPriority`).
In order to minimize the changes, the new calculation is to keep the
initial setting to PRIORITY_LOW, adjust it using a new
`network.fetchpriority.adjustments.*` preference depending on the
fetchpriority attributes, and then preserve further adjustments for
LOAD_BACKGROUND and `BoostPriority`.
For the default value `fetchpriority=auto`, there is no adjustment
i.e. we continue to start with PRIORITY_LOW. `fetchpriority=low/high`
are respectively mapped to PRIORITY_LOW/PRIORITY_HIGH which is simple
and consistent with the "Image" cases from Google's web.dev article
https://web.dev/articles/fetch-priority. These values could of course
be revised in the future after more experiments.
This change is covered by the following tests below. The expectations
is modified to match what is described above (i.e. map to PRIORITY_LOW
or PRIORITY_HIGH with adjustment due to LOAD_BACKGROUND):
- `link-initial-preload-image.h2.html`
- `link-dynamic-preload-image.h2.html`
- `kPipeHeaderPreloadImageLinks`
Based on a patch by Mirko Brodesser ([email protected])
Differential Revision: https://phabricator.services.mozilla.com/D197493
This patch adds fetchpriority support for `<link rel=preload as=image>`
and equivalent HTTP Link header. The fetchpriority value is passed from
where the link is parsed down to `NewImageChannel` where the priority
is initially set. Currently, the default equals PRIORITY_LOW, but is
decreased a bit if LOAD_BACKGROUND flag is set (this is always the case
for link preload images, see `imgLoader::LoadImage`). Later, the
priority can be increased again depending on the category (see
`imgRequest::BoostPriority`).
In order to minimize the changes, the new calculation is to keep the
initial setting to PRIORITY_LOW, adjust it using a new
`network.fetchpriority.adjustments.*` preference depending on the
fetchpriority attributes, and then preserve further adjustments for
LOAD_BACKGROUND and `BoostPriority`.
For the default value `fetchpriority=auto`, there is no adjustment
i.e. we continue to start with PRIORITY_LOW. `fetchpriority=low/high`
are respectively mapped to PRIORITY_LOW/PRIORITY_HIGH which is simple
and consistent with the "Image" cases from Google's web.dev article
https://web.dev/articles/fetch-priority. These values could of course
be revised in the future after more experiments.
This change is covered by the following tests below. The expectations
is modified to match what is described above (i.e. map to PRIORITY_LOW
or PRIORITY_HIGH with adjustment due to LOAD_BACKGROUND):
- `link-initial-preload-image.h2.html`
- `link-dynamic-preload-image.h2.html`
- `kPipeHeaderPreloadImageLinks`
Based on a patch by Mirko Brodesser ([email protected])
Differential Revision: https://phabricator.services.mozilla.com/D197493
Sorry this is not a particularly easy patch to review. But it should be
mostly straight-forward.
I kept Document::Dispatch mostly for convenience, but could be
cleaned-up too / changed by SchedulerGroup::Dispatch. Similarly maybe
that can just be NS_DispatchToMainThread if we add an NS_IsMainThread
check there or something (to preserve shutdown semantics).
Differential Revision: https://phabricator.services.mozilla.com/D190450
We are working on an alternative approach to improving OnStart/OnStop request timing, and so will remove this probe because it's no longer as relevant and the implementation touchs many classes and methods.
Differential Revision: https://phabricator.services.mozilla.com/D187233
Having it disabled is not web compatible, and there's no strong reason
to keep it, IMO.
If we want another pref to determine whether preloads are actually
triggered we can add it in the future.
Differential Revision: https://phabricator.services.mozilla.com/D186014
The current behaviour would treat all null principals as the same, and
is using an extra comparison for origin attributes explicitly in
addition to the web exposed origin serialization. As far as I can tell,
this will never be called with a null `aPrincipal`, but I figured it was
worth fixing.
This changes the logic to use full principals for comparison, rather
than serializing to strings.
Differential Revision: https://phabricator.services.mozilla.com/D182227
It's a security risk such that the maximized external program can obscure
the fullscreen notification and the malicious site can use this trick
to load a spoofed page in the background without user notices it.
This patch minimized the risk by always exit the fullscreen mode when
an external protocol is triggered.
Differential Revision: https://phabricator.services.mozilla.com/D177771
It's a security risk such that the maximized external program can obscure
the fullscreen notification and the malicious site can use this trick
to load a spoofed page in the background without user notices it.
This patch minimized the risk by always exit the fullscreen mode when
an external protocol is triggered.
Differential Revision: https://phabricator.services.mozilla.com/D177771
This probably made more sense when everything was in the same process,
so that prefs like the image cache size etc only measured web content.
But that's achieved via e10s nowadays, so probably having different
cache tables for chrome:// URIs is overkill. Plus, we probably want to
also clear resource:// URIs etc when flushing chrome caches and so on.
Differential Revision: https://phabricator.services.mozilla.com/D177765
This prevents copies and avoids the hack we have to avoid this, which
right now is using nsDependent{C,}String.
Non-virtual actors can still use `nsString` if they need to on the
receiving end.
Differential Revision: https://phabricator.services.mozilla.com/D152519
All its members are optional, so we can just use it as a plain struct
rather than Maybe<> all around, which simplifies the code and prevents
silly bugs like bug 1779592.
Mostly automatic via:
rg -l 'SVGImageContext' . | xargs sed -i 's/Maybe<SVGImageContext>/SVGImageContext/g'
With trivial build fixes.
Not intended to change behavior.
Differential Revision: https://phabricator.services.mozilla.com/D151846
I've also tested the behavior in Chrome and I think this is
the correct way of doing it. Chrome also only notifies the
cached entry once, it won't notify it even if I manually
trigger it after pageload.
Differential Revision: https://phabricator.services.mozilla.com/D138346
Instead treat these protocols as "never-expiring" protocols, and clean
up revalidation code while at it.
Depends on D132347
Differential Revision: https://phabricator.services.mozilla.com/D132348
Now that we no longer have the extra layer of ImageContainers providing
a superficial level of caching/reuse of existing blob recordings, we
need some way to share recordings. This part adds support to
SurfaceCache to store BlobSurfaceProvider objects.
This includes the specialized code for invalidating SVG images. In
particular this is useful for animated SVG images. In general we want to
avoid changing the image key whenever possible so that we avoid
reallocating the underlying buffers in the compositor process for the
rasterized blob images.
We also need to track the ImageIntRegion used by the recording. If a
caller only wants a slice of the SVG image, then we need to track this
differentiation in our cache entries. At this time, we don't allow
substitutes for entries with a region exclusion.
Differential Revision: https://phabricator.services.mozilla.com/D126603
Now that we no longer have the extra layer of ImageContainers providing
a superficial level of caching/reuse of existing blob recordings, we
need some way to share recordings. This part adds support to
SurfaceCache to store BlobSurfaceProvider objects.
This includes the specialized code for invalidating SVG images. In
particular this is useful for animated SVG images. In general we want to
avoid changing the image key whenever possible so that we avoid
reallocating the underlying buffers in the compositor process for the
rasterized blob images.
We also need to track the ImageIntRegion used by the recording. If a
caller only wants a slice of the SVG image, then we need to track this
differentiation in our cache entries. At this time, we don't allow
substitutes for entries with a region exclusion.
Differential Revision: https://phabricator.services.mozilla.com/D126603
Now that we no longer have the extra layer of ImageContainers providing
a superficial level of caching/reuse of existing blob recordings, we
need some way to share recordings. This part adds support to
SurfaceCache to store BlobSurfaceProvider objects.
This includes the specialized code for invalidating SVG images. In
particular this is useful for animated SVG images. In general we want to
avoid changing the image key whenever possible so that we avoid
reallocating the underlying buffers in the compositor process for the
rasterized blob images.
We also need to track the ImageIntRegion used by the recording. If a
caller only wants a slice of the SVG image, then we need to track this
differentiation in our cache entries. At this time, we don't allow
substitutes for entries with a region exclusion.
Differential Revision: https://phabricator.services.mozilla.com/D126603
Tooru Fujisawa