Currently ContentClient will attempt to create a buffer of any size
that Layers requires it to. If that fails it will then warn if the
requested buffer was an unreasonable size. This change makes it so
that we check whether the size is reasonable first, and do not attempt
to create the buffer if it is unreasonable.
Previously the operating system would have managed to allocate some
buffers that we deem unreasonable, but at the cost of the system
becoming unresponsive. Now, some large buffers which would previously
have been created won't be, but the chances of the system becoming
unresponsive should decrease.
Ideally Layers wouldn't request buffers of these sizes in the first
place - there are measures in place to try to prevent it, and more work
is certainly required. However, this will act as a last ditch defence.
MozReview-Commit-ID: 7WCqEwkmViy
This implements recording of buffer preparing commands for MultiTiledContentClient
and replaying it on the paint thread.
The order of locking for tiling is important and for buffer copying the front
buffer needs to be attempted to be locked before the back buffer. This means
we can't do this on the paint thread like we do for ContentClient, so instead
I've changed the OpenMode::ASYNC to be a flag that can be applied to
OpenMode::OPEN_READ as well as WRITE, as it looks like we can apply the same
logic for READ as WRITE.
MozReview-Commit-ID: ED6eeYx8dUV
This commit reverts DoubleBufferedContentClient to creating a back buffer
if there is an existing front buffer. This reverts back to a sequence of a
finalize frame, unrotate, and initialize new back buffer. When we are
not async painting we do each buffer operation immediately. If we are
async painting, then we collect all of the buffer operations and perform
them on the paint thread.
Note on locking: The destination for buffer copies must always be opened
with the async write flag, and the source must be unlocked.
MozReview-Commit-ID: Gu4EcblY7Sg
This commit does the work of actually dispatching the recorded buffer operations
to the paint thread, and removing some main thread asserts from TextureClient.
MozReview-Commit-ID: CN3RoQPz9fP
This commit adds a CapturedBufferState which is used to record all the operations
that are necessary for preparing the buffers. The commands are then instantly
executed to preserve the same behavior, but in the following commit they will
be dispatched to the paint thread.
Note: RotatedBuffer's aren't thread safe and so a shallow copy needs to be made
for sending to the paint thread. This complicates the code for AdjustTo as it can
fail naturally and the buffer parameter changes are needed later in BeginPaint.
So the code for AdjustTo is split up a bit to accomodate that.
MozReview-Commit-ID: FwSwFay887o
To sync the back buffer with the front buffer, we set the back buffer rect and
rotation to the front buffer's, and then copy over the pixels that different.
We used to do the updating of the rect and rotation before BeginPaint, but that
isn't necessary and we can move it to be with the copying of pixels.
MozReview-Commit-ID: HzBKvMZkn1
This commit is an optimization for double buffering that delays the creation of
a back buffer until we know what kind of content type it needs to be.
Before this commit, we would EnsureBackBufferIfFrontBuffer before BeginPaint,
then in BeginPaint we could determine that we actually needed a different kind
of buffer because the content changed type, and recreate it.
This was needed because BeginPaint would copy the old front buffer to the buffer
created by EnsureBackBufferIfFrontBuffer, and then if anything failed or we had
determined we couldn't reuse the buffer, we would create a new one and copy that
"temporary" back buffer over, and use the new one.
This is unnecessary because we only need read access on that "temporary" back
buffer, and so we can just use the current front buffer instead.
This optimization only affects the double buffered case, and the single buffered
or basic cases should remain the same.
Note: Because we now need the front buffer for copying into the new back buffer,
we cannot Clear() it away in some error cases.
Note: The code in FinalizeFrame assumes that the back and front buffer have the
same size. This was implicitly enforced before, and now needs to be explicitly
enforced. This commit tries to preserve the exact same behavior, although the
restriction should be removed as long as the back buffer is large enough for
the visible region.
MozReview-Commit-ID: 2hyrrUhA4zO
BufferContentType and BufferSizeOkFor make more sense as general functions for
any RotatedBuffer, and this helps out in a later patch.
MozReview-Commit-ID: EAVodvl4WTu
This commit does the work of actually dispatching the recorded buffer operations
to the paint thread, and removing some main thread asserts from TextureClient.
MozReview-Commit-ID: CN3RoQPz9fP
This commit adds a CapturedBufferState which is used to record all the operations
that are necessary for preparing the buffers. The commands are then instantly
executed to preserve the same behavior, but in the following commit they will
be dispatched to the paint thread.
Note: RotatedBuffer's aren't thread safe and so a shallow copy needs to be made
for sending to the paint thread. This complicates the code for AdjustTo as it can
fail naturally and the buffer parameter changes are needed later in BeginPaint.
So the code for AdjustTo is split up a bit to accomodate that.
MozReview-Commit-ID: FwSwFay887o
To sync the back buffer with the front buffer, we set the back buffer rect and
rotation to the front buffer's, and then copy over the pixels that different.
We used to do the updating of the rect and rotation before BeginPaint, but that
isn't necessary and we can move it to be with the copying of pixels.
MozReview-Commit-ID: HzBKvMZkn1
This commit is an optimization for double buffering that delays the creation of
a back buffer until we know what kind of content type it needs to be.
Before this commit, we would EnsureBackBufferIfFrontBuffer before BeginPaint,
then in BeginPaint we could determine that we actually needed a different kind
of buffer because the content changed type, and recreate it.
This was needed because BeginPaint would copy the old front buffer to the buffer
created by EnsureBackBufferIfFrontBuffer, and then if anything failed or we had
determined we couldn't reuse the buffer, we would create a new one and copy that
"temporary" back buffer over, and use the new one.
This is unnecessary because we only need read access on that "temporary" back
buffer, and so we can just use the current front buffer instead.
This optimization only affects the double buffered case, and the single buffered
or basic cases should remain the same.
Note: Because we now need the front buffer for copying into the new back buffer,
we cannot Clear() it away in some error cases.
Note: The code in FinalizeFrame assumes that the back and front buffer have the
same size. This was implicitly enforced before, and now needs to be explicitly
enforced. This commit tries to preserve the exact same behavior, although the
restriction should be removed as long as the back buffer is large enough for
the visible region.
MozReview-Commit-ID: 2hyrrUhA4zO
BufferContentType and BufferSizeOkFor make more sense as general functions for
any RotatedBuffer, and this helps out in a later patch.
MozReview-Commit-ID: EAVodvl4WTu
This commit does the work of actually dispatching the recorded buffer operations
to the paint thread, and removing some main thread asserts from TextureClient.
MozReview-Commit-ID: CN3RoQPz9fP
This commit adds a CapturedBufferState which is used to record all the operations
that are necessary for preparing the buffers. The commands are then instantly
executed to preserve the same behavior, but in the following commit they will
be dispatched to the paint thread.
Note: RotatedBuffer's aren't thread safe and so a shallow copy needs to be made
for sending to the paint thread. This complicates the code for AdjustTo as it can
fail naturally and the buffer parameter changes are needed later in BeginPaint.
So the code for AdjustTo is split up a bit to accomodate that.
MozReview-Commit-ID: FwSwFay887o
To sync the back buffer with the front buffer, we set the back buffer rect and
rotation to the front buffer's, and then copy over the pixels that different.
We used to do the updating of the rect and rotation before BeginPaint, but that
isn't necessary and we can move it to be with the copying of pixels.
MozReview-Commit-ID: HzBKvMZkn1
This commit is an optimization for double buffering that delays the creation of
a back buffer until we know what kind of content type it needs to be.
Before this commit, we would EnsureBackBufferIfFrontBuffer before BeginPaint,
then in BeginPaint we could determine that we actually needed a different kind
of buffer because the content changed type, and recreate it.
This was needed because BeginPaint would copy the old front buffer to the buffer
created by EnsureBackBufferIfFrontBuffer, and then if anything failed or we had
determined we couldn't reuse the buffer, we would create a new one and copy that
"temporary" back buffer over, and use the new one.
This is unnecessary because we only need read access on that "temporary" back
buffer, and so we can just use the current front buffer instead.
This optimization only affects the double buffered case, and the single buffered
or basic cases should remain the same.
Note: Because we now need the front buffer for copying into the new back buffer,
we cannot Clear() it away in some error cases.
MozReview-Commit-ID: 2hyrrUhA4zO
BufferContentType and BufferSizeOkFor make more sense as general functions for
any RotatedBuffer, and this helps out in a later patch.
MozReview-Commit-ID: EAVodvl4WTu
Even if we cannot reuse the back buffer, we still use it to initialize the new back buffer.
The correct condition for detecting changes to buffer mode should only care if there is a
buffer, not if we decided to reuse it.
If the buffer mode has changed to component alpha, we need to invalidate and repaint everything
because we won't be able to copy over content to the new buffer correctly.
I believe this is a regression from the refactoring that created this function from
RotatedContentBuffer::BeginPaint.
MozReview-Commit-ID: H9G7GxqekLt
This patch was generated automatically by the "modeline.py" script, available
here: https://github.com/amccreight/moz-source-tools/blob/master/modeline.py
For every file that is modified in this patch, the changes are as follows:
(1) The patch changes the file to use the exact C++ mode lines from the
Mozilla coding style guide, available here:
https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style#Mode_Line
(2) The patch deletes any blank lines between the mode line & the MPL
boilerplate comment.
(3) If the file previously had the mode lines and MPL boilerplate in a
single contiguous C++ comment, then the patch splits them into
separate C++ comments, to match the boilerplate in the coding style.
MozReview-Commit-ID: 77D61xpSmIl
mInAsyncPaint is only needed because the code using CreateBuffer expects the
buffer to be locked when it is returned. This isn't necessary because we can
now lock in BeginPaint.
MozReview-Commit-ID: 8WazvBKMbvb
Now that BeginPaintBuffer and BeginPaint are both implemented by content client,
I think it makes sense to just merge them into one method. This simplifies the
interface clients have to use.
MozReview-Commit-ID: 8bjH6WcpZS9
This commit does some more cleanup on the content client class hierarchy.
Some methods were virtual or instance methods when they didn't need to be.
MozReview-Commit-ID: 2y2D3zYtYvM
CapturedPaintState::mTarget is actually a dual draw target to the black and
white draw targets, so this code will have the white draw target cleared black
and then white. This isn't incorrect, it's just wasteful.
MozReview-Commit-ID: ItgiSmegPK6
UpdateDestinationFrom actually only uses a rect, so it's best to not be
misleading and force the clients of it to do the conversion.
MozReview-Commit-ID: EsUv3apqnku
This could be a part of the previous commit, but I omitted it to keep the size
down. Just some updates to comments and documentation.
MozReview-Commit-ID: HkCOSIQhBNv
This commit is the guts of the refactoring.
This commit removes rotated content buffer, and moves the necessary
functionality to content client. All content clients now do not inherit from
rotated content buffer, but contain a refptr to a rotated buffer.
For the basic content client, this is a DrawTargetRotatedBuffer.
For the remote content client, this is a RemoteRotatedBuffer.
The double buffered content client contains an additional RemoteRotatedBuffer
for the front buffer.
Each derived class of content client only needs to implement a method to
create its own rotated buffer. The rest is handled by the base content
client. The remote content clients still override some additional methods
to sync buffers and do IPC.
MozReview-Commit-ID: B9vcSi8UYhm
Miscellaneous cleanup, PaintState doesn't need to know this as no one uses
this information outside of the content client classes.
MozReview-Commit-ID: 6K8LxEPvp4V
The front buffer for a double buffered content client is really just another
rotated buffer, so it can simplify the code to use the class we just added.
The goal is to have the back and the front buffer using remote rotated buffers,
but this is a good first step.
Note: The front buffer is represented as a Maybe<RemoteRotatedBuffer> in this
commit, but in the future it will be a RefPtr. That can't be done yet, because
rotated buffer can't implement refcounting in addition to compositable client.
MozReview-Commit-ID: Czk3otkf1pb
UpdateDestinationFrom is a useful method for any rotated buffer. This will be
needed when content clients are no longer rotated buffers.
Note: EnsureBuffer and EnsureBufferOnWhite were moved out of
UpdateDestinationFrom because I'd like to kill those methods, and so the calls
were moved to all users of UpdateDestinationFrom.
MozReview-Commit-ID: 2e3HhUsZ6iw
