This:
- increases max image cache entry size and adjusts related parameters.
- makes the cache entry timeout configurable for advanced tweaking.
- adds a mechanism to keep commonly-used, small image sizes in cache
longer.
Includes squashed changes of:
- m-c 1317907: Refactor FrameAnimator::GetCompositedFrame to be a bit simpler
- m-c 1351434: bugfix
- m-c 686905: Enable the pref image.mem.animated.discardable to allow discarding of animated images
https://bugzilla.mozilla.org/show_bug.cgi?id=1547792
Aspect Ratio handling simplified by using floating point integers:
- Multiplication of value (or inverse value) to a known side for Scaling
- No unequal equal values such as "4/3" vs "8/6" vs "20/15"
- Truly "Empty" aspect ratios, even if one dimension is not 0
A dimension of 3000 largest size x or y should cover all common caching cases for SVG icons and web app elements, but not caching large vector rasters that would exhaust the cache.
This limit is a royal 36MB/element (3000x3000x4) as cap (if the SVG is square). This avoids performance regressions when repeatedly scaling large vector images, but also allows for large SVG backgrounds to be cached.
It allows for the bad practice of slapping a large SVG on a site as html background, considering they are likely, even when using large sizes for "responsive" layout, not going to exceed 3000 px in the largest dimension (and if they do, the web designer needs to be slapped with a big trout).
Moonchild
Martok
FranklinDM
Andy
adeshkp
wolfbeast
Matt A. Tobin