Update on what happened in WebKit in the week from September 7 to September 14.
In this week's edition, the PNG image decoder received a much needed cleanup, as well as another swipe of unassorted graphics improvements, most notably in the Layer-Based SVG Engine. Finally, we also have an exciting and informative article about how to use the WPE Platform API on Raspberry Pi.
Cross-Port 🐱
Graphics 🖼️
Cleaned up the PNG image decoder a little bit, by removing conditional code that was used to support libpng versions older than 1.5.0, and requiring that as the minimum version. Given that version 1.5.0 was released back in 2011, it is expected that every system where current WebKit works will have much newer versions of libpng anyway.
Fixed an assertion failure for an outermost <svg> with non-visible overflow in the Layer-Based SVG Engine (LBSE) by refreshing its scroll dimensions at the end of layout, a first step towards reworking <svg> scrolling, which is not yet spec compliant.
Fixed an assertion failure when computing filter outsets for <feGaussianBlur> and <feDropShadow> with a negative stdDeviation, which turns the primitive off but was still passed on to the outset calculation, affecting both SVG filters and CSS reference filters.
Stopped reporting damage every frame for composited layers that use CSS filter in the Skia based compositor, so a blurred or drop-shadowed element is now only repainted when its subtree, or the applied (possibly animated) filter value, actually changed.
Fixed the bug that composited layers with clipping or masking and fully covered by opaque child layers were treated as opaque layers.
Fixed two debug assertion failures in the Layer-Based SVG Engine (LBSE), one where an SVG transform change left ancestor layer repaint rects stale and one where repainting on a compositing change during layout tripped an over-strict check on the paint offset cache.
Fixed the white noised image issue on the combination of i915 driver and Intel Arc after 308458@main introduced image atlas uploading.
Community & Events 🤝
Published a blog post describing the steps to try WPE Platform API on Raspberry Pi with latest WebKit main branch.
That’s all for this week!
