start preparing 8.11

whats-new.md

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+---
+title: What's new in 8.11
+---
+
+libvips 8.11 is almost now out, so here's a quick overview of what's new. Check
+the [ChangeLog](https://github.com/libvips/libvips/blob/master/ChangeLog)
+if you need more details.
+
+Credit to Zeranoe, DarthSim, Projkt-James, afontenot, erdmann, kleisauke
+and others for their great work on this release.
+
+[Lunaphore](https://www.lunaphore.ch/) kindly sponsored the development of
+the new JPEG2000 features, see below.
+
+# Loadable modules for some image format loaders
+
+- move openslide, libheif, poppler and magick to loadable modules [kleisauke]
+
+# Experimental JPEG-XL support
+
+- add JPEG-XL load and save
+
+# Thread recycling
+
+- new threading model has a single threadpool shared by all 
+  pipelines [kleisauke]
+
+# Full-colour text rendering
+
+- add "rgba" flag to `vips_text()` to enable full colour text rendering
+
+# JPEG2000 support
+
+- add jp2kload, jp2ksave
+- add jp2k compression to tiff load and save
+
+# More loaders and savers moved to the new source / target framework
+
+- add `vips_jpegload_source()` and `vips_svgload_source()` to public C API
+- add `vips_source_g_input_stream_new()` to load images from a GInputStream
+- add `openslideload_source()`, `vipsload_source()`, `vipssave_target()`
+- vipsthumbnail supports stdin / stdout thumbnailing
+- add `vips_fitsload_source()`, `vips_niftiload_source()`
+- add source load support for pdfium
+
+# C++ API improments
+
+- integrate doxygen in build system to generate C++ API docs
+- improve C++ API doc comments
+- add VipsInterpolate and guint64 support to C++ API 
+- add `VImage::new_from_memory_steal` [Zeranoe]
+
+# New and improved image processing operations
+
+- add "seed" param to perlin, worley and gaussnoise
+- add hist path to rank for large windows on uchar images
+- `hist_find` outputs a double histogram for large images [erdmann]
+- add `black_point_compensation` flag for icc transforms
+- better detection of invalid ICC profiles, better fallback paths
+
+# Other
+
+- better 8/16-bit choice for pngsave
+- png and gif load note background colour as metadata [781545872]
+- add GIF load with libnsgif
+- add "premultiply" flag to tiffsave
+- have a lock just for pdfium [DarthSim]
+- avoid NaN in mapim [afontenot]
+- fix ref leaks in mosaicing package
+- run libvips leak test in CI 
+- get pdfium load building again [Projkt-James]
+
+As usual,
+the [ChangeLog](https://github.com/libvips/libvips/blob/master/ChangeLog)
+has more details, if you're interested.
+