stylo: Add support for calcs in base size calculation
This tracks an offset along with the ratio for the keyword font size data.
The offset gets used when a calc is involved whilst inheriting font-size
(it is the computed value of that calc ignoring em/percentage portions,
which go into the ratio). If the family or language changes, the new font
size can be computed by taking the keyword's size in the context of that
family/language, multiplying it by the ratio, and adding the offset.
r=emilio https://bugzilla.mozilla.org/show_bug.cgi?id=1380980
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This tracks an offset along with the ratio for the keyword font size
data. The offset gets used when a calc is involved whilst inheriting
font-size (it is the computed value of that calc ignoring em/percentage
portions, which go into the ratio). If the family or language changes,
the new font size can be computed by taking the keyword's size in the context
of that family/language, multiplying it by the ratio, and adding the
offset.
I want to play with autogenerating style structs, and color is the smallest
struct out there.
However, moving it out of the mako file is a requirement. This patch does that.
Properly set default direction of prefixed linear gradients
The default linear gradient direction is `to bottom`. This correspondes to
`top` keyword in prefixed linear gradients. We should preserve the default value.
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- [X] These changes fix [Bug 1395189](https://bugzilla.mozilla.org/show_bug.cgi?id=1395189)
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Skip adding/accumulating ClipRect values which corresponding rect offset is auto.
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This is a PR for https://bugzilla.mozilla.org/show_bug.cgi?id=1390352
This patch will skip adding/accumulating the values which corresponding rect offset is auto, and make Servo_AnimationValues_ComputeDistance return negative value instead of 0.0 when the function fails to distinguish its failure.
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There are already these tests in dom/smil/tests of gecko, this PR will enable these tests.
For detail, see https://bugzilla.mozilla.org/show_bug.cgi?id=1390352.
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The default linear gradient direction is `to bottom`. This correspondes to
`top` keyword in prefixed linear gradients. We should preserve the default value.
stylo: Bug 1390039 - Implement compute_distance for mismatched transform lists.
Implement ComputeSquaredDistance for mismatched transform lists.
In order to do this, we have to convert a transform list into a 3d matrix,
so I move the code from layout module into style module for reusing it.
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- [X] These changes fix [Bug 1390039](https://bugzilla.mozilla.org/show_bug.cgi?id=1390039).
- [X] These changes do not require tests because this is a Gecko feature and I add many tests in Gecko already.
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Use whether we've computed any viewport unit instead.
This is more accurate (we avoid restyling unnecessarily if we've found anything
ever on the stylesheet, but that hasn't matched).
This has the benefit of also matching Gecko, and simplify some code and
fishyness around, and also hopefully speeding up stylesheet parsing.
The trait ToAnimatedZero now supports it, and it now applies to things with generics,
avoiding the trait bounds for field types of the variant on which it applies.
We could use this method to convert a TransformList into a Matrix, and
use this matrix for computing distance for Stylo and rendering the transform
for Servo.
This is an equivalent of nsStyleTransformMatrix::ReadTransforms in Gecko.
This patch will skip add_weighted() when self_portion + other_portion not equal
to zero. (i.e. adding or accumulating).
Gecko does same behavior since we can't add two auto value.
Add ComputeSquaredDistance trait for SvgLengthOrPercentageOrNumber
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This is a PR for https://bugzilla.mozilla.org/show_bug.cgi?id=1387986
This patch will add ComputeSquaredDistance trait for SvgLengthOrPercentageOrNumber in order to calculating distance between LengthOrPercentage and Number.
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Currently, Servo uses ComputeSquaredDistance derive for
SvgLengthOrPercentageOrNumber, so servo can't calculate between
LengthOrPercentage and Number.
This PR will allow calculating these value.
