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.
Support None and NotSet for the fallback type of SVGPaint.
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We didn't set None and NotSet for the fallback type of SVGPaint, and it caused the fallback color is wrong when fallback color is empty or keyword `none`. So, we add the None and NotSet support for it.
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Reduce usage of fmt in serialization and error reporting
`format!` and `write!` create a somewhat-heavyweight `Formatting` struct and use dynamic dispatch to call into impls of `Dispaly` and related traits. The former also allocates an intermediate string that is sometimes unnecessary.
I started looking into this from https://bugzilla.mozilla.org/show_bug.cgi?id=1355599, but I expect the impact there will be small to insignificant. It might be a slightly less so on parsing (error reporting).
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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.
PR #18103 disallowed interpolation between fill:none and fill:none, but that change was regressed by the refactoring in PR #18239.
This patch restores the intended behavior, disabling animation of SVGPaintKind::None.
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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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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