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Planet Igalia0 Hot0 comments10 min read
Skia compositor for WPE WebKit and WebKitGTK
WPE WebKit and WebKitGTK 2.54 ship a new Skia-based compositor that replaces the long-standing TextureMapper implementation, which used OpenGL ES with a large custom set of shader programs and was largely unmaintained. Igalia's WebKit graphics team details the multi-stage effort: a SkiaCompositingLayer class to iterate the layer tree, simplified filter implementation avoiding intermediate surfaces, more efficient mask handling via clipShader/clipPath, fixed z-ordering bugs in 3D contexts, new blend mode support, batched painting to reduce GPU command queue overhead, promise images to avoid redundant texture wrapping, and Deferred Display Lists (DDL) for a cleaner multithreaded Ganesh usage. The new compositor is enabled by default in 2.54, is 45% faster on a new composition test suite and 35% faster on MotionMark 1.3.1, though it trails TextureMapper by 26% and 10% on two MotionMark 1.3 15fps tests due to the DDL trade-off. TextureMapper is now disabled by default at build time on the main branch and will be removed for GTK and WPE ports, though 2.54 still allows falling back via the WEBKIT_USE_SKIA_FOR_COMPOSITION=0 environment variable.
Source: https://blogs.igalia.com/carlosgc/2026/09/21/skia-compositor-for-wpe-webkit-and-webkitgtk. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.
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