Make font-stretch animatable.
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This is a PR for https://bugzilla.mozilla.org/show_bug.cgi?id=1357663
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Recalculate font-size when generic changes
With the MathML refactorings this feature got lost. It would still get
recalculated when explicitly specified as a keyword, but not otherwise.
To avoid hitting the font metrics provider too often, we only do this
when the generic changes. Otherwise we trust the existing calculated
font.
I swear, once Stylo lands I'm going to campaign to remove font-size from CSS entirely. 😩
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With the MathML refactorings this feature got lost. It would still get
recalculated when explicitly specified as a keyword, but not otherwise.
To avoid hitting the font metrics provider too often, we only do this
when the generic changes. Otherwise we trust the existing calculated
font.
FeatureTagValue value property changed to use u32. ToCss for
FeatureTagValue changed to allow conversion from u32 to string. Parse
for the same struct updated to convert from string to u32. Added two
functions to transfer settings to gecko and copy settings.
Introduce ComputeDistance trait, which implement compute_distance and
compute_squared_distance.
For vector, compute_squared_distance is necessary because we use Euclidean
distance as the distance between two values. The easier way to implement
compute_squared_distance is to square the result from compute_distance, but
for some property values, they may have many components, e.g. (v1, v2, v3).
If we just square the result from compute_distance, the computation is
(sqrt(v1^2 + v2^2 + v3^2))^2. There are two redundant operators:
"square-root" and then "square". In order to avoid this, we should
implement compute_squared_distance separately for these types.
MozReview-Commit-ID: LmmrUXYlDb6
scriptlevel is a property that affects how font-size is inherited. If scriptlevel is
+1, for example, it will inherit as the script size multiplier times
the parent font. This does not affect cases where the font-size is
explicitly set.
However, this transformation is not allowed to reduce the size below
scriptminsize. If this inheritance will reduce it to below
scriptminsize, it will be set to scriptminsize or the parent size,
whichever is smaller (the parent size could be smaller than the min size
because it was explicitly specified).
Now, within a node that has inherited a font-size which was
crossing scriptminsize once the scriptlevel was applied, a negative
scriptlevel may be used to increase the size again.
This should work, however if we have already been capped by the
scriptminsize multiple times, this can lead to a jump in the size.
For example, if we have text of the form:
huge large medium small tiny reallytiny tiny small medium huge
which is represented by progressive nesting and scriptlevel values of
+1 till the center after which the scriptlevel is -1, the "tiny"s should
be the same size, as should be the "small"s and "medium"s, etc.
However, if scriptminsize kicked it at around "medium", then
medium/tiny/reallytiny will all be the same size (the min size).
A -1 scriptlevel change after this will increase the min size by the
multiplier, making the second tiny larger than medium.
Instead, we wish for the second "tiny" to still be capped by the script
level, and when we reach the second "large", it should be the same size
as the original one.
We do this by cascading two separate font sizes. The font size (mSize)
is the actual displayed font size. The unconstrained font size
(mScriptUnconstrainedSize) is the font size in the situation where
scriptminsize never applied.
We calculate the proposed inherited font size based on scriptlevel and
the parent unconstrained size, instead of using the parent font size.
This is stored in the node's unconstrained size and will also be stored
in the font size provided that it is above the min size.
All of this only applies when inheriting. When the font size is
manually set, scriptminsize does not apply, and both the real and
unconstrained size are set to the explicit value. However, if the font
size is manually set to an em or percent unit, the unconstrained size
will be set to the value of that unit computed against the parent
unconstrained size, whereas the font size will be set computing against
the parent font size.
MozReview-Commit-ID: 820BIWqno3L
