This changes the display-item storage to store layers against the underlying
frame and all merged frames of an item (and similarly, to retrieve them against
all frames of an item).
This changes the display-item storage to store layers against the underlying
frame and all merged frames of an item (and similarly, to retrieve them against
all frames of an item).
Instead of forcing a full-layer invalidation when new frames appear, invalidate
only the bounds of the frame. Invalidating untrusted geometry still causes a
full-layer invalidation.
As clip items aren't processed, they have no associated layer entries. This is
a problem when a clip item's underlying frame is the same as one that gets
merged into a container layer, as display-item data will be created, but no
layer entry will be added. This will cause it to be removed on the next
layer-build, and cause a full invalidation.
Fix this by adding an 'mIsMergedFrame' entry to DisplayItemDataEntry and setting
it on all merged frames in BuildContainerLayerFor. This property stops the
entry from being removed when it gets updated.
Since Bug 758620, it's possible for an nsDisplayTransform to appear as the
child of a container layer. This caused problems when it was inactive, as the
invalidation would not be transformed in this case.
Fix this in FrameLayerBuilder by mandating that InvalidateThebesLayerContents
takes the untransformed invalidation and apply the transform in
BuildContainerLayer.
Change GetThebesLayerResolutionForFrame to GetThebesLayerScaleForFrame,
which just returns a scale. Ensure that the scale is as accurate as possible
even if dedicated layers for scrolled content (or any layers at all) have not
been created yet, by taking into account transforms that have not yet
generated layers. This makes the decisions made by
nsGfxScrollFrameInner::ScrollToImpl independent of whether there is
currently an active layer for the scrolled content (or much more nearly so).
In nsGfxScrollFrameInner::ScrollToImpl, do not use the current internal
fractional offset of the ThebesLayer, which is in a mostly unrelated
coordinate space to our scroll positions. Instead, just try to make sure
that the previous and next scroll position differ by a whole number of
layer pixels.
Change GetThebesLayerResolutionForFrame to GetThebesLayerScaleForFrame,
which just returns a scale. Ensure that the scale is as accurate as possible
even if dedicated layers for scrolled content (or any layers at all) have not
been created yet, by taking into account transforms that have not yet
generated layers. This makes the decisions made by
nsGfxScrollFrameInner::ScrollToImpl independent of whether there is
currently an active layer for the scrolled content (or much more nearly so).
In nsGfxScrollFrameInner::ScrollToImpl, do not use the current internal
fractional offset of the ThebesLayer, which is in a mostly unrelated
coordinate space to our scroll positions. Instead, just try to make sure
that the previous and next scroll position differ by a whole number of
layer pixels.
Change GetThebesLayerResolutionForFrame to GetThebesLayerScaleForFrame,
which just returns a scale. Ensure that the scale is as accurate as possible
even if dedicated layers for scrolled content (or any layers at all) have not
been created yet, by taking into account transforms that have not yet
generated layers. This makes the decisions made by
nsGfxScrollFrameInner::ScrollToImpl independent of whether there is
currently an active layer for the scrolled content (or much more nearly so).
In nsGfxScrollFrameInner::ScrollToImpl, do not use the current internal
fractional offset of the ThebesLayer, which is in a mostly unrelated
coordinate space to our scroll positions. Instead, just try to make sure
that the previous and next scroll position differ by a whole number of
layer pixels.
