This fixes bug 1153539 with the Firefox download arrow being pixellated
(verified by testing locally).
I also confirmed what happens on a flame device with the transform
unlocking the Firefox OS homescreen (bug 945082 / bug 972310). For that
transform (which had a maximum scale of 2), I see four calls to
GetSuitableScale:
GetSuitableScale: aMaxScale=2.000000, displayVisibleRatio=1.000000
GetSuitableScale: aMaxScale=2.000000, displayVisibleRatio=1.000586
GetSuitableScale: aMaxScale=2.000000, displayVisibleRatio=1.000000
GetSuitableScale: aMaxScale=2.000000, displayVisibleRatio=1.000586
(Presumably the first and third are for width, and the second and fourth
are for height.) I believe this shows that bug 972310 will remain fixed
with this patch.
I chose to use the pres context's visible area rather than the screen
size because it seemed more appropriate, and also because (if memory
serves correctly) it's much cheaper to get.
Change interface of getter/setter for mClipRect,
also necessary modification for codes that use these resources.
* * *
Bundle mUseClipRect and mClipRect as Maybe<ParentLayerIntRect> mClipRect
- Added specialized rect clipping functionality to Matrix4x4::ProjectRectBounds
so we don't have to return infinite values when rects cross the w=0 plane
in homogenous coordinate space.
- Updated callsites of ProjectRectBounds to pass a clipping rect that is
appropriate for the units that are returned.
This adds support for class="reftest-opaque-layer" and for
reftest-assigned-layer="some-layer-name" to the reftest harness.
From reftest/README.txt:
Opaque Layer Tests: class="reftest-opaque-layer"
================================================
If an element should be assigned to a PaintedLayer that's opaque, set the class
"reftest-opaque-layer" on it. This checks whether the layer is opaque during
the last paint of the test, and it works whether your test is an invalidation
test or not. In order to pass the test, the element has to have a primary
frame, and that frame's display items must all be assigned to a single painted
layer and no other layers, so it can't be used on elements that create stacking
contexts (active or inactive).
Layerization Tests: reftest-assigned-layer="layer-name"
=======================================================
If two elements should be assigned to the same PaintedLayer, choose any string
value as the layer name and set the attribute reftest-assigned-layer="yourname"
on both elements. Reftest will check whether all elements with the same
reftest-assigned-layer value share the same layer. It will also test whether
elements with different reftest-assigned-layer values are assigned to different
layers.
The same restrictions as with class="reftest-opaque-layer" apply: All elements
must have a primary frame, and that frame's display items must all be assigned
to the same PaintedLayer and no other layers. If these requirements are not
met, the test will fail.
Once we're smarter about recycling the right layer, we can't decide on a layer
as soon as we encounter its first display item. We might need to have to look
at all of the assigned display items. This change makes that requirement
explicit.
The calls above don't need access to the PaintedLayer, but the ones this change
is moving down do. This change just makes it more obvious that we're free to
move the calls to an even later point.
UpdateCommonClipCount accesses the PaintedLayerData's mLayer field in order to
get the layer manager. We want to be able to call UpdateCommonClipCount when
mLayer is null.
