In the next patch in this series, we would like to update the error handling of
the call to StyleAnimationValue::Interpolate in
KeyframeEffectReadOnly::ComposeStyle. Using AnimValuesStyleRule::AddEmptyValue
there, however, makes handling the error case difficult because we need a means
of clearing the allocated StyleAnimationValue.
However, simply using AnimationValuesStyleRule::AddValue means we will end up
doing needless allocations for StyleAnimationValue objects (the copy
constructor for which can result in performing potentially expensive heap
allocations, such as when lists are deep-copied).
Instead, we add a Move constructor to StyleAnimationValue and add an overload
of AnimValuesStyleRule::AddValue that takes an rvalue reference. This
provides a more consistent interface to AnimValuesStyleRule and avoids the
unnecessary allocations from copying StyleAnimationValue objects.
MozReview-Commit-ID: CaP1uPAgNnm
An explanation of the Mozilla Source Code Directory Structure and links to
project pages with documentation can be found at:
https://developer.mozilla.org/en/Mozilla_Source_Code_Directory_Structure
For information on how to build Mozilla from the source code, see:
http://developer.mozilla.org/en/docs/Build_Documentation
To have your bug fix / feature added to Mozilla, you should create a patch and
submit it to Bugzilla (https://bugzilla.mozilla.org). Instructions are at:
http://developer.mozilla.org/en/docs/Creating_a_patch
http://developer.mozilla.org/en/docs/Getting_your_patch_in_the_tree
If you have a question about developing Mozilla, and can't find the solution
on http://developer.mozilla.org, you can try asking your question in a
mozilla.* Usenet group, or on IRC at irc.mozilla.org. [The Mozilla news groups
are accessible on Google Groups, or news.mozilla.org with a NNTP reader.]
You can download nightly development builds from the Mozilla FTP server.
Keep in mind that nightly builds, which are used by Mozilla developers for
testing, may be buggy. Firefox nightlies, for example, can be found at:
https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/
- or -
http://nightly.mozilla.org/
a9d4b99d8d