Cairo

This release fixes synchronization problems in the SHM transport for cairo-xlib.

Replacing entire images is now avoided when uploading subimages.

Other minor bugs have been fixed.

A large number of bugs were fixed.

Cairo was reworked to interoperate more closely with various acceleration architectures. A tracing utility, cairo-trace, was implemented, creating replayable, compact sequences of drawing commands made by an application, allowing better debug and performance optimization. The image backend is much faster with a new polygon rasterisation engine and a complete overhaul of the tessellator. The API was extended to better support printing, including dramatic file size reductions. The RGB16 format was resurrected.

Several minor configuration and build issues were resolved. A random crash caused by _cairo_clip_intersect_mask(), causing all
rendering to the context to stop, was fixed. Transforming nearly-degenerate matrices into degenerate matrices is now avoided. A few FreeType font handling bugs were fixed. Various documentation improvements were made.

Several fixes for failures on Quartz and PDF and
build fixes for a couple of backends were made. A
check for XRender in the XCB backend was
introduced to avoid invalid memory accesses.